[9975839] | 1 | #include <machine/rtems-bsd-kernel-space.h> |
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| 2 | |
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| 3 | /*- |
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| 4 | * Copyright (c) 2004 John Baldwin <jhb@FreeBSD.org> |
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[8475e7a] | 5 | * Copyright (c) 2015 embedded brains GmbH <rtems@embedded-brains.de> |
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[9975839] | 6 | * All rights reserved. |
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| 7 | * |
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| 8 | * Redistribution and use in source and binary forms, with or without |
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| 9 | * modification, are permitted provided that the following conditions |
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| 10 | * are met: |
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| 11 | * 1. Redistributions of source code must retain the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer. |
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| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 14 | * notice, this list of conditions and the following disclaimer in the |
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| 15 | * documentation and/or other materials provided with the distribution. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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| 18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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| 21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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| 26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 27 | * SUCH DAMAGE. |
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| 28 | */ |
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| 29 | |
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| 30 | /* |
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| 31 | * Implementation of sleep queues used to hold queue of threads blocked on |
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| 32 | * a wait channel. Sleep queues different from turnstiles in that wait |
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| 33 | * channels are not owned by anyone, so there is no priority propagation. |
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| 34 | * Sleep queues can also provide a timeout and can also be interrupted by |
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| 35 | * signals. That said, there are several similarities between the turnstile |
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| 36 | * and sleep queue implementations. (Note: turnstiles were implemented |
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| 37 | * first.) For example, both use a hash table of the same size where each |
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| 38 | * bucket is referred to as a "chain" that contains both a spin lock and |
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| 39 | * a linked list of queues. An individual queue is located by using a hash |
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| 40 | * to pick a chain, locking the chain, and then walking the chain searching |
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| 41 | * for the queue. This means that a wait channel object does not need to |
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| 42 | * embed it's queue head just as locks do not embed their turnstile queue |
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| 43 | * head. Threads also carry around a sleep queue that they lend to the |
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| 44 | * wait channel when blocking. Just as in turnstiles, the queue includes |
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| 45 | * a free list of the sleep queues of other threads blocked on the same |
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| 46 | * wait channel in the case of multiple waiters. |
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| 47 | * |
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| 48 | * Some additional functionality provided by sleep queues include the |
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| 49 | * ability to set a timeout. The timeout is managed using a per-thread |
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| 50 | * callout that resumes a thread if it is asleep. A thread may also |
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| 51 | * catch signals while it is asleep (aka an interruptible sleep). The |
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| 52 | * signal code uses sleepq_abort() to interrupt a sleeping thread. Finally, |
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| 53 | * sleep queues also provide some extra assertions. One is not allowed to |
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| 54 | * mix the sleep/wakeup and cv APIs for a given wait channel. Also, one |
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| 55 | * must consistently use the same lock to synchronize with a wait channel, |
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| 56 | * though this check is currently only a warning for sleep/wakeup due to |
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| 57 | * pre-existing abuse of that API. The same lock must also be held when |
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| 58 | * awakening threads, though that is currently only enforced for condition |
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| 59 | * variables. |
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| 60 | */ |
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| 61 | |
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| 62 | #include <sys/cdefs.h> |
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| 63 | __FBSDID("$FreeBSD$"); |
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| 64 | |
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| 65 | #include <rtems/bsd/local/opt_sleepqueue_profiling.h> |
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| 66 | #include <rtems/bsd/local/opt_ddb.h> |
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| 67 | #include <rtems/bsd/local/opt_kdtrace.h> |
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| 68 | #include <rtems/bsd/local/opt_sched.h> |
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| 69 | |
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| 70 | #include <rtems/bsd/sys/param.h> |
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| 71 | #include <sys/systm.h> |
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| 72 | #include <rtems/bsd/sys/lock.h> |
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| 73 | #include <sys/kernel.h> |
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| 74 | #include <sys/ktr.h> |
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| 75 | #include <sys/mutex.h> |
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| 76 | #include <sys/proc.h> |
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| 77 | #include <sys/sbuf.h> |
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| 78 | #include <sys/sched.h> |
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| 79 | #include <sys/sdt.h> |
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| 80 | #include <sys/signalvar.h> |
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| 81 | #include <sys/sleepqueue.h> |
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| 82 | #include <sys/sysctl.h> |
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| 83 | |
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| 84 | #include <vm/uma.h> |
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| 85 | |
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| 86 | #ifdef DDB |
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| 87 | #include <ddb/ddb.h> |
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| 88 | #endif |
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[8475e7a] | 89 | #ifdef __rtems__ |
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| 90 | #include <machine/rtems-bsd-thread.h> |
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| 91 | #include <rtems/score/threadimpl.h> |
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[8b722db] | 92 | #include <rtems/score/watchdogimpl.h> |
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[8475e7a] | 93 | #endif /* __rtems__ */ |
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[9975839] | 94 | |
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| 95 | /* |
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| 96 | * Constants for the hash table of sleep queue chains. These constants are |
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| 97 | * the same ones that 4BSD (and possibly earlier versions of BSD) used. |
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| 98 | * Basically, we ignore the lower 8 bits of the address since most wait |
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| 99 | * channel pointers are aligned and only look at the next 7 bits for the |
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| 100 | * hash. SC_TABLESIZE must be a power of two for SC_MASK to work properly. |
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| 101 | */ |
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| 102 | #define SC_TABLESIZE 128 /* Must be power of 2. */ |
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| 103 | #define SC_MASK (SC_TABLESIZE - 1) |
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| 104 | #define SC_SHIFT 8 |
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| 105 | #define SC_HASH(wc) (((uintptr_t)(wc) >> SC_SHIFT) & SC_MASK) |
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| 106 | #define SC_LOOKUP(wc) &sleepq_chains[SC_HASH(wc)] |
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| 107 | #define NR_SLEEPQS 2 |
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| 108 | /* |
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| 109 | * There two different lists of sleep queues. Both lists are connected |
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| 110 | * via the sq_hash entries. The first list is the sleep queue chain list |
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| 111 | * that a sleep queue is on when it is attached to a wait channel. The |
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| 112 | * second list is the free list hung off of a sleep queue that is attached |
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| 113 | * to a wait channel. |
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| 114 | * |
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| 115 | * Each sleep queue also contains the wait channel it is attached to, the |
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| 116 | * list of threads blocked on that wait channel, flags specific to the |
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| 117 | * wait channel, and the lock used to synchronize with a wait channel. |
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| 118 | * The flags are used to catch mismatches between the various consumers |
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| 119 | * of the sleep queue API (e.g. sleep/wakeup and condition variables). |
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| 120 | * The lock pointer is only used when invariants are enabled for various |
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| 121 | * debugging checks. |
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| 122 | * |
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| 123 | * Locking key: |
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| 124 | * c - sleep queue chain lock |
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| 125 | */ |
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| 126 | struct sleepqueue { |
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| 127 | TAILQ_HEAD(, thread) sq_blocked[NR_SLEEPQS]; /* (c) Blocked threads. */ |
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| 128 | u_int sq_blockedcnt[NR_SLEEPQS]; /* (c) N. of blocked threads. */ |
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| 129 | LIST_ENTRY(sleepqueue) sq_hash; /* (c) Chain and free list. */ |
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| 130 | LIST_HEAD(, sleepqueue) sq_free; /* (c) Free queues. */ |
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| 131 | void *sq_wchan; /* (c) Wait channel. */ |
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| 132 | int sq_type; /* (c) Queue type. */ |
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| 133 | #ifdef INVARIANTS |
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| 134 | struct lock_object *sq_lock; /* (c) Associated lock. */ |
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| 135 | #endif |
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| 136 | }; |
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| 137 | |
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| 138 | struct sleepqueue_chain { |
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| 139 | LIST_HEAD(, sleepqueue) sc_queues; /* List of sleep queues. */ |
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| 140 | struct mtx sc_lock; /* Spin lock for this chain. */ |
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| 141 | #ifdef SLEEPQUEUE_PROFILING |
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| 142 | u_int sc_depth; /* Length of sc_queues. */ |
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| 143 | u_int sc_max_depth; /* Max length of sc_queues. */ |
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| 144 | #endif |
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| 145 | }; |
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| 146 | |
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| 147 | #ifdef SLEEPQUEUE_PROFILING |
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| 148 | u_int sleepq_max_depth; |
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| 149 | static SYSCTL_NODE(_debug, OID_AUTO, sleepq, CTLFLAG_RD, 0, "sleepq profiling"); |
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| 150 | static SYSCTL_NODE(_debug_sleepq, OID_AUTO, chains, CTLFLAG_RD, 0, |
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| 151 | "sleepq chain stats"); |
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| 152 | SYSCTL_UINT(_debug_sleepq, OID_AUTO, max_depth, CTLFLAG_RD, &sleepq_max_depth, |
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| 153 | 0, "maxmimum depth achieved of a single chain"); |
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| 154 | |
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| 155 | static void sleepq_profile(const char *wmesg); |
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| 156 | static int prof_enabled; |
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| 157 | #endif |
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| 158 | static struct sleepqueue_chain sleepq_chains[SC_TABLESIZE]; |
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| 159 | static uma_zone_t sleepq_zone; |
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| 160 | |
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| 161 | /* |
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| 162 | * Prototypes for non-exported routines. |
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| 163 | */ |
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[8475e7a] | 164 | #ifndef __rtems__ |
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[9975839] | 165 | static int sleepq_catch_signals(void *wchan, int pri); |
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| 166 | static int sleepq_check_signals(void); |
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| 167 | static int sleepq_check_timeout(void); |
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[8475e7a] | 168 | #endif /* __rtems__ */ |
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[9975839] | 169 | #ifdef INVARIANTS |
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| 170 | static void sleepq_dtor(void *mem, int size, void *arg); |
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| 171 | #endif |
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| 172 | static int sleepq_init(void *mem, int size, int flags); |
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| 173 | static int sleepq_resume_thread(struct sleepqueue *sq, struct thread *td, |
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| 174 | int pri); |
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| 175 | static void sleepq_switch(void *wchan, int pri); |
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[8475e7a] | 176 | #ifndef __rtems__ |
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[9975839] | 177 | static void sleepq_timeout(void *arg); |
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[8475e7a] | 178 | #else /* __rtems__ */ |
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| 179 | static void sleepq_timeout(Objects_Id id, void *arg); |
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| 180 | #endif /* __rtems__ */ |
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[9975839] | 181 | |
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| 182 | SDT_PROBE_DECLARE(sched, , , sleep); |
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| 183 | SDT_PROBE_DECLARE(sched, , , wakeup); |
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| 184 | |
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| 185 | /* |
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| 186 | * Early initialization of sleep queues that is called from the sleepinit() |
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| 187 | * SYSINIT. |
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| 188 | */ |
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| 189 | void |
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| 190 | init_sleepqueues(void) |
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| 191 | { |
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| 192 | #ifdef SLEEPQUEUE_PROFILING |
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| 193 | struct sysctl_oid *chain_oid; |
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| 194 | char chain_name[10]; |
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| 195 | #endif |
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| 196 | int i; |
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| 197 | |
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| 198 | for (i = 0; i < SC_TABLESIZE; i++) { |
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| 199 | LIST_INIT(&sleepq_chains[i].sc_queues); |
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| 200 | mtx_init(&sleepq_chains[i].sc_lock, "sleepq chain", NULL, |
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| 201 | MTX_SPIN | MTX_RECURSE); |
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| 202 | #ifdef SLEEPQUEUE_PROFILING |
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| 203 | snprintf(chain_name, sizeof(chain_name), "%d", i); |
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| 204 | chain_oid = SYSCTL_ADD_NODE(NULL, |
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| 205 | SYSCTL_STATIC_CHILDREN(_debug_sleepq_chains), OID_AUTO, |
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| 206 | chain_name, CTLFLAG_RD, NULL, "sleepq chain stats"); |
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| 207 | SYSCTL_ADD_UINT(NULL, SYSCTL_CHILDREN(chain_oid), OID_AUTO, |
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| 208 | "depth", CTLFLAG_RD, &sleepq_chains[i].sc_depth, 0, NULL); |
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| 209 | SYSCTL_ADD_UINT(NULL, SYSCTL_CHILDREN(chain_oid), OID_AUTO, |
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| 210 | "max_depth", CTLFLAG_RD, &sleepq_chains[i].sc_max_depth, 0, |
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| 211 | NULL); |
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| 212 | #endif |
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| 213 | } |
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| 214 | sleepq_zone = uma_zcreate("SLEEPQUEUE", sizeof(struct sleepqueue), |
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| 215 | #ifdef INVARIANTS |
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| 216 | NULL, sleepq_dtor, sleepq_init, NULL, UMA_ALIGN_CACHE, 0); |
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| 217 | #else |
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| 218 | NULL, NULL, sleepq_init, NULL, UMA_ALIGN_CACHE, 0); |
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| 219 | #endif |
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| 220 | |
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[8475e7a] | 221 | #ifndef __rtems__ |
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[9975839] | 222 | thread0.td_sleepqueue = sleepq_alloc(); |
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[8475e7a] | 223 | #endif /* __rtems__ */ |
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[9975839] | 224 | } |
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| 225 | |
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| 226 | /* |
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| 227 | * Get a sleep queue for a new thread. |
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| 228 | */ |
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| 229 | struct sleepqueue * |
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| 230 | sleepq_alloc(void) |
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| 231 | { |
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| 232 | |
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| 233 | return (uma_zalloc(sleepq_zone, M_WAITOK)); |
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| 234 | } |
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| 235 | |
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| 236 | /* |
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| 237 | * Free a sleep queue when a thread is destroyed. |
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| 238 | */ |
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| 239 | void |
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| 240 | sleepq_free(struct sleepqueue *sq) |
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| 241 | { |
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| 242 | |
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| 243 | uma_zfree(sleepq_zone, sq); |
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| 244 | } |
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| 245 | |
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| 246 | /* |
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| 247 | * Lock the sleep queue chain associated with the specified wait channel. |
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| 248 | */ |
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| 249 | void |
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| 250 | sleepq_lock(void *wchan) |
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| 251 | { |
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| 252 | struct sleepqueue_chain *sc; |
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| 253 | |
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| 254 | sc = SC_LOOKUP(wchan); |
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| 255 | mtx_lock_spin(&sc->sc_lock); |
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| 256 | } |
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| 257 | |
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| 258 | /* |
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| 259 | * Look up the sleep queue associated with a given wait channel in the hash |
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| 260 | * table locking the associated sleep queue chain. If no queue is found in |
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| 261 | * the table, NULL is returned. |
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| 262 | */ |
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| 263 | struct sleepqueue * |
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| 264 | sleepq_lookup(void *wchan) |
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| 265 | { |
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| 266 | struct sleepqueue_chain *sc; |
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| 267 | struct sleepqueue *sq; |
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| 268 | |
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| 269 | KASSERT(wchan != NULL, ("%s: invalid NULL wait channel", __func__)); |
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| 270 | sc = SC_LOOKUP(wchan); |
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| 271 | mtx_assert(&sc->sc_lock, MA_OWNED); |
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| 272 | LIST_FOREACH(sq, &sc->sc_queues, sq_hash) |
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| 273 | if (sq->sq_wchan == wchan) |
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| 274 | return (sq); |
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| 275 | return (NULL); |
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| 276 | } |
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| 277 | |
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| 278 | /* |
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| 279 | * Unlock the sleep queue chain associated with a given wait channel. |
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| 280 | */ |
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| 281 | void |
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| 282 | sleepq_release(void *wchan) |
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| 283 | { |
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| 284 | struct sleepqueue_chain *sc; |
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| 285 | |
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| 286 | sc = SC_LOOKUP(wchan); |
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| 287 | mtx_unlock_spin(&sc->sc_lock); |
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| 288 | } |
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| 289 | |
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| 290 | /* |
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| 291 | * Places the current thread on the sleep queue for the specified wait |
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| 292 | * channel. If INVARIANTS is enabled, then it associates the passed in |
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| 293 | * lock with the sleepq to make sure it is held when that sleep queue is |
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| 294 | * woken up. |
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| 295 | */ |
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| 296 | void |
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| 297 | sleepq_add(void *wchan, struct lock_object *lock, const char *wmesg, int flags, |
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| 298 | int queue) |
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| 299 | { |
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| 300 | struct sleepqueue_chain *sc; |
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| 301 | struct sleepqueue *sq; |
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| 302 | struct thread *td; |
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[8475e7a] | 303 | #ifdef __rtems__ |
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| 304 | ISR_lock_Context lock_context; |
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| 305 | Thread_Control *executing; |
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| 306 | struct thread *succ; |
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| 307 | #endif /* __rtems__ */ |
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[9975839] | 308 | |
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| 309 | td = curthread; |
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| 310 | sc = SC_LOOKUP(wchan); |
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| 311 | mtx_assert(&sc->sc_lock, MA_OWNED); |
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| 312 | MPASS(td->td_sleepqueue != NULL); |
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| 313 | MPASS(wchan != NULL); |
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| 314 | MPASS((queue >= 0) && (queue < NR_SLEEPQS)); |
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| 315 | |
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| 316 | /* If this thread is not allowed to sleep, die a horrible death. */ |
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| 317 | KASSERT(!(td->td_pflags & TDP_NOSLEEPING), |
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| 318 | ("Trying sleep, but thread marked as sleeping prohibited")); |
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| 319 | |
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| 320 | /* Look up the sleep queue associated with the wait channel 'wchan'. */ |
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| 321 | sq = sleepq_lookup(wchan); |
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| 322 | |
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| 323 | /* |
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| 324 | * If the wait channel does not already have a sleep queue, use |
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| 325 | * this thread's sleep queue. Otherwise, insert the current thread |
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| 326 | * into the sleep queue already in use by this wait channel. |
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| 327 | */ |
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| 328 | if (sq == NULL) { |
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| 329 | #ifdef INVARIANTS |
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| 330 | int i; |
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| 331 | |
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| 332 | sq = td->td_sleepqueue; |
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| 333 | for (i = 0; i < NR_SLEEPQS; i++) { |
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| 334 | KASSERT(TAILQ_EMPTY(&sq->sq_blocked[i]), |
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| 335 | ("thread's sleep queue %d is not empty", i)); |
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| 336 | KASSERT(sq->sq_blockedcnt[i] == 0, |
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| 337 | ("thread's sleep queue %d count mismatches", i)); |
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| 338 | } |
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| 339 | KASSERT(LIST_EMPTY(&sq->sq_free), |
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| 340 | ("thread's sleep queue has a non-empty free list")); |
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| 341 | KASSERT(sq->sq_wchan == NULL, ("stale sq_wchan pointer")); |
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| 342 | sq->sq_lock = lock; |
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| 343 | #endif |
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| 344 | #ifdef SLEEPQUEUE_PROFILING |
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| 345 | sc->sc_depth++; |
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| 346 | if (sc->sc_depth > sc->sc_max_depth) { |
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| 347 | sc->sc_max_depth = sc->sc_depth; |
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| 348 | if (sc->sc_max_depth > sleepq_max_depth) |
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| 349 | sleepq_max_depth = sc->sc_max_depth; |
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| 350 | } |
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| 351 | #endif |
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| 352 | sq = td->td_sleepqueue; |
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| 353 | LIST_INSERT_HEAD(&sc->sc_queues, sq, sq_hash); |
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| 354 | sq->sq_wchan = wchan; |
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| 355 | sq->sq_type = flags & SLEEPQ_TYPE; |
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| 356 | } else { |
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| 357 | MPASS(wchan == sq->sq_wchan); |
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| 358 | MPASS(lock == sq->sq_lock); |
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| 359 | MPASS((flags & SLEEPQ_TYPE) == sq->sq_type); |
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| 360 | LIST_INSERT_HEAD(&sq->sq_free, td->td_sleepqueue, sq_hash); |
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| 361 | } |
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| 362 | thread_lock(td); |
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[8475e7a] | 363 | #ifndef __rtems__ |
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[9975839] | 364 | TAILQ_INSERT_TAIL(&sq->sq_blocked[queue], td, td_slpq); |
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[8475e7a] | 365 | #else /* __rtems__ */ |
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| 366 | /* FIXME: This is broken with clustered scheduling */ |
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| 367 | succ = NULL; |
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| 368 | TAILQ_FOREACH(succ, &sq->sq_blocked[queue], td_slpq) { |
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| 369 | if (td->td_thread->current_priority < |
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| 370 | succ->td_thread->current_priority) |
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| 371 | break; |
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| 372 | } |
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| 373 | if (succ == NULL) |
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| 374 | TAILQ_INSERT_TAIL(&sq->sq_blocked[queue], td, td_slpq); |
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| 375 | else |
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| 376 | TAILQ_INSERT_BEFORE(succ, td, td_slpq); |
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| 377 | #endif /* __rtems__ */ |
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[9975839] | 378 | sq->sq_blockedcnt[queue]++; |
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[8475e7a] | 379 | #ifdef __rtems__ |
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| 380 | executing = td->td_thread; |
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[67f8497] | 381 | _Thread_Lock_acquire_default(executing, &lock_context); |
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[8475e7a] | 382 | td->td_sq_state = TD_SQ_TIRED; |
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| 383 | #endif /* __rtems__ */ |
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[9975839] | 384 | td->td_sleepqueue = NULL; |
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| 385 | td->td_sqqueue = queue; |
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| 386 | td->td_wchan = wchan; |
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| 387 | td->td_wmesg = wmesg; |
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[8475e7a] | 388 | #ifndef __rtems__ |
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[9975839] | 389 | if (flags & SLEEPQ_INTERRUPTIBLE) { |
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| 390 | td->td_flags |= TDF_SINTR; |
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| 391 | td->td_flags &= ~TDF_SLEEPABORT; |
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| 392 | } |
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| 393 | thread_unlock(td); |
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[8475e7a] | 394 | #else /* __rtems__ */ |
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[67f8497] | 395 | _Thread_Lock_release_default(executing, &lock_context); |
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[8475e7a] | 396 | #endif /* __rtems__ */ |
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[9975839] | 397 | } |
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| 398 | |
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| 399 | /* |
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| 400 | * Sets a timeout that will remove the current thread from the specified |
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| 401 | * sleep queue after timo ticks if the thread has not already been awakened. |
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| 402 | */ |
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| 403 | void |
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| 404 | sleepq_set_timeout(void *wchan, int timo) |
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| 405 | { |
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[8475e7a] | 406 | #ifndef __rtems__ |
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[9975839] | 407 | struct sleepqueue_chain *sc; |
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| 408 | struct thread *td; |
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| 409 | |
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| 410 | td = curthread; |
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| 411 | sc = SC_LOOKUP(wchan); |
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| 412 | mtx_assert(&sc->sc_lock, MA_OWNED); |
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| 413 | MPASS(TD_ON_SLEEPQ(td)); |
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| 414 | MPASS(td->td_sleepqueue == NULL); |
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| 415 | MPASS(wchan != NULL); |
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| 416 | callout_reset_curcpu(&td->td_slpcallout, timo, sleepq_timeout, td); |
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[8475e7a] | 417 | #else /* __rtems__ */ |
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| 418 | Thread_Control *executing; |
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| 419 | |
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| 420 | _Thread_Disable_dispatch(); |
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| 421 | executing = _Thread_Executing; |
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| 422 | BSD_ASSERT(executing->Timer.state == WATCHDOG_INACTIVE); |
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| 423 | _Watchdog_Initialize(&executing->Timer, sleepq_timeout, |
---|
| 424 | 0, executing); |
---|
| 425 | _Watchdog_Insert_ticks(&executing->Timer, (Watchdog_Interval)timo); |
---|
| 426 | _Thread_Enable_dispatch(); |
---|
| 427 | #endif /* __rtems__ */ |
---|
[9975839] | 428 | } |
---|
| 429 | |
---|
| 430 | /* |
---|
| 431 | * Return the number of actual sleepers for the specified queue. |
---|
| 432 | */ |
---|
| 433 | u_int |
---|
| 434 | sleepq_sleepcnt(void *wchan, int queue) |
---|
| 435 | { |
---|
| 436 | struct sleepqueue *sq; |
---|
| 437 | |
---|
| 438 | KASSERT(wchan != NULL, ("%s: invalid NULL wait channel", __func__)); |
---|
| 439 | MPASS((queue >= 0) && (queue < NR_SLEEPQS)); |
---|
| 440 | sq = sleepq_lookup(wchan); |
---|
| 441 | if (sq == NULL) |
---|
| 442 | return (0); |
---|
| 443 | return (sq->sq_blockedcnt[queue]); |
---|
| 444 | } |
---|
| 445 | |
---|
[8475e7a] | 446 | #ifndef __rtems__ |
---|
[9975839] | 447 | /* |
---|
| 448 | * Marks the pending sleep of the current thread as interruptible and |
---|
| 449 | * makes an initial check for pending signals before putting a thread |
---|
| 450 | * to sleep. Enters and exits with the thread lock held. Thread lock |
---|
| 451 | * may have transitioned from the sleepq lock to a run lock. |
---|
| 452 | */ |
---|
| 453 | static int |
---|
| 454 | sleepq_catch_signals(void *wchan, int pri) |
---|
| 455 | { |
---|
| 456 | struct sleepqueue_chain *sc; |
---|
| 457 | struct sleepqueue *sq; |
---|
| 458 | struct thread *td; |
---|
| 459 | struct proc *p; |
---|
| 460 | struct sigacts *ps; |
---|
| 461 | int sig, ret, stop_allowed; |
---|
| 462 | |
---|
| 463 | td = curthread; |
---|
| 464 | p = curproc; |
---|
| 465 | sc = SC_LOOKUP(wchan); |
---|
| 466 | mtx_assert(&sc->sc_lock, MA_OWNED); |
---|
| 467 | MPASS(wchan != NULL); |
---|
| 468 | if ((td->td_pflags & TDP_WAKEUP) != 0) { |
---|
| 469 | td->td_pflags &= ~TDP_WAKEUP; |
---|
| 470 | ret = EINTR; |
---|
| 471 | thread_lock(td); |
---|
| 472 | goto out; |
---|
| 473 | } |
---|
| 474 | |
---|
| 475 | /* |
---|
| 476 | * See if there are any pending signals for this thread. If not |
---|
| 477 | * we can switch immediately. Otherwise do the signal processing |
---|
| 478 | * directly. |
---|
| 479 | */ |
---|
| 480 | thread_lock(td); |
---|
| 481 | if ((td->td_flags & (TDF_NEEDSIGCHK | TDF_NEEDSUSPCHK)) == 0) { |
---|
| 482 | sleepq_switch(wchan, pri); |
---|
| 483 | return (0); |
---|
| 484 | } |
---|
| 485 | stop_allowed = (td->td_flags & TDF_SBDRY) ? SIG_STOP_NOT_ALLOWED : |
---|
| 486 | SIG_STOP_ALLOWED; |
---|
| 487 | thread_unlock(td); |
---|
| 488 | mtx_unlock_spin(&sc->sc_lock); |
---|
| 489 | CTR3(KTR_PROC, "sleepq catching signals: thread %p (pid %ld, %s)", |
---|
| 490 | (void *)td, (long)p->p_pid, td->td_name); |
---|
| 491 | PROC_LOCK(p); |
---|
| 492 | ps = p->p_sigacts; |
---|
| 493 | mtx_lock(&ps->ps_mtx); |
---|
| 494 | sig = cursig(td, stop_allowed); |
---|
| 495 | if (sig == 0) { |
---|
| 496 | mtx_unlock(&ps->ps_mtx); |
---|
| 497 | ret = thread_suspend_check(1); |
---|
| 498 | MPASS(ret == 0 || ret == EINTR || ret == ERESTART); |
---|
| 499 | } else { |
---|
| 500 | if (SIGISMEMBER(ps->ps_sigintr, sig)) |
---|
| 501 | ret = EINTR; |
---|
| 502 | else |
---|
| 503 | ret = ERESTART; |
---|
| 504 | mtx_unlock(&ps->ps_mtx); |
---|
| 505 | } |
---|
| 506 | /* |
---|
| 507 | * Lock the per-process spinlock prior to dropping the PROC_LOCK |
---|
| 508 | * to avoid a signal delivery race. PROC_LOCK, PROC_SLOCK, and |
---|
| 509 | * thread_lock() are currently held in tdsendsignal(). |
---|
| 510 | */ |
---|
| 511 | PROC_SLOCK(p); |
---|
| 512 | mtx_lock_spin(&sc->sc_lock); |
---|
| 513 | PROC_UNLOCK(p); |
---|
| 514 | thread_lock(td); |
---|
| 515 | PROC_SUNLOCK(p); |
---|
| 516 | if (ret == 0) { |
---|
| 517 | sleepq_switch(wchan, pri); |
---|
| 518 | return (0); |
---|
| 519 | } |
---|
| 520 | out: |
---|
| 521 | /* |
---|
| 522 | * There were pending signals and this thread is still |
---|
| 523 | * on the sleep queue, remove it from the sleep queue. |
---|
| 524 | */ |
---|
| 525 | if (TD_ON_SLEEPQ(td)) { |
---|
| 526 | sq = sleepq_lookup(wchan); |
---|
| 527 | if (sleepq_resume_thread(sq, td, 0)) { |
---|
| 528 | #ifdef INVARIANTS |
---|
| 529 | /* |
---|
| 530 | * This thread hasn't gone to sleep yet, so it |
---|
| 531 | * should not be swapped out. |
---|
| 532 | */ |
---|
| 533 | panic("not waking up swapper"); |
---|
| 534 | #endif |
---|
| 535 | } |
---|
| 536 | } |
---|
| 537 | mtx_unlock_spin(&sc->sc_lock); |
---|
| 538 | MPASS(td->td_lock != &sc->sc_lock); |
---|
| 539 | return (ret); |
---|
| 540 | } |
---|
[8475e7a] | 541 | #endif /* __rtems__ */ |
---|
[9975839] | 542 | |
---|
| 543 | /* |
---|
| 544 | * Switches to another thread if we are still asleep on a sleep queue. |
---|
| 545 | * Returns with thread lock. |
---|
| 546 | */ |
---|
| 547 | static void |
---|
| 548 | sleepq_switch(void *wchan, int pri) |
---|
| 549 | { |
---|
[8475e7a] | 550 | #ifndef __rtems__ |
---|
[9975839] | 551 | struct sleepqueue_chain *sc; |
---|
| 552 | struct sleepqueue *sq; |
---|
| 553 | struct thread *td; |
---|
| 554 | |
---|
| 555 | td = curthread; |
---|
| 556 | sc = SC_LOOKUP(wchan); |
---|
| 557 | mtx_assert(&sc->sc_lock, MA_OWNED); |
---|
| 558 | THREAD_LOCK_ASSERT(td, MA_OWNED); |
---|
| 559 | |
---|
| 560 | /* |
---|
| 561 | * If we have a sleep queue, then we've already been woken up, so |
---|
| 562 | * just return. |
---|
| 563 | */ |
---|
| 564 | if (td->td_sleepqueue != NULL) { |
---|
| 565 | mtx_unlock_spin(&sc->sc_lock); |
---|
| 566 | return; |
---|
| 567 | } |
---|
| 568 | |
---|
| 569 | /* |
---|
| 570 | * If TDF_TIMEOUT is set, then our sleep has been timed out |
---|
| 571 | * already but we are still on the sleep queue, so dequeue the |
---|
| 572 | * thread and return. |
---|
| 573 | */ |
---|
| 574 | if (td->td_flags & TDF_TIMEOUT) { |
---|
| 575 | MPASS(TD_ON_SLEEPQ(td)); |
---|
| 576 | sq = sleepq_lookup(wchan); |
---|
| 577 | if (sleepq_resume_thread(sq, td, 0)) { |
---|
| 578 | #ifdef INVARIANTS |
---|
| 579 | /* |
---|
| 580 | * This thread hasn't gone to sleep yet, so it |
---|
| 581 | * should not be swapped out. |
---|
| 582 | */ |
---|
| 583 | panic("not waking up swapper"); |
---|
| 584 | #endif |
---|
| 585 | } |
---|
| 586 | mtx_unlock_spin(&sc->sc_lock); |
---|
| 587 | return; |
---|
| 588 | } |
---|
| 589 | #ifdef SLEEPQUEUE_PROFILING |
---|
| 590 | if (prof_enabled) |
---|
| 591 | sleepq_profile(td->td_wmesg); |
---|
| 592 | #endif |
---|
| 593 | MPASS(td->td_sleepqueue == NULL); |
---|
| 594 | sched_sleep(td, pri); |
---|
| 595 | thread_lock_set(td, &sc->sc_lock); |
---|
| 596 | SDT_PROBE0(sched, , , sleep); |
---|
| 597 | TD_SET_SLEEPING(td); |
---|
| 598 | mi_switch(SW_VOL | SWT_SLEEPQ, NULL); |
---|
| 599 | KASSERT(TD_IS_RUNNING(td), ("running but not TDS_RUNNING")); |
---|
| 600 | CTR3(KTR_PROC, "sleepq resume: thread %p (pid %ld, %s)", |
---|
| 601 | (void *)td, (long)td->td_proc->p_pid, (void *)td->td_name); |
---|
[8475e7a] | 602 | #else /* __rtems__ */ |
---|
| 603 | Thread_Control *executing; |
---|
| 604 | ISR_lock_Context lock_context; |
---|
| 605 | struct thread *td; |
---|
| 606 | bool block; |
---|
| 607 | bool remove; |
---|
| 608 | |
---|
| 609 | sleepq_release(wchan); |
---|
| 610 | |
---|
[67f8497] | 611 | executing = _Thread_Lock_acquire_default_for_executing(&lock_context); |
---|
[8475e7a] | 612 | td = rtems_bsd_get_thread(executing); |
---|
| 613 | BSD_ASSERT(td != NULL); |
---|
| 614 | |
---|
| 615 | block = false; |
---|
| 616 | remove = false; |
---|
| 617 | switch (td->td_sq_state) { |
---|
| 618 | case TD_SQ_TIRED: |
---|
| 619 | BSD_ASSERT(td->td_wchan == wchan); |
---|
| 620 | td->td_sq_state = TD_SQ_SLEEPY; |
---|
| 621 | block = true; |
---|
| 622 | break; |
---|
| 623 | case TD_SQ_NIGHTMARE: |
---|
| 624 | BSD_ASSERT(td->td_wchan == wchan); |
---|
| 625 | td->td_sq_state = TD_SQ_PANIC; |
---|
| 626 | remove = true; |
---|
| 627 | break; |
---|
| 628 | default: |
---|
| 629 | BSD_ASSERT(td->td_wchan == NULL); |
---|
| 630 | BSD_ASSERT(td->td_sq_state == TD_SQ_WAKEUP); |
---|
| 631 | break; |
---|
| 632 | } |
---|
| 633 | |
---|
| 634 | if (block) { |
---|
| 635 | Per_CPU_Control *cpu_self; |
---|
| 636 | bool unblock; |
---|
| 637 | |
---|
[67f8497] | 638 | cpu_self = _Thread_Dispatch_disable_critical(); |
---|
| 639 | _Thread_Lock_release_default(executing, &lock_context); |
---|
[8475e7a] | 640 | |
---|
| 641 | _Thread_Set_state(executing, STATES_WAITING_FOR_BSD_WAKEUP); |
---|
| 642 | |
---|
[67f8497] | 643 | _Thread_Lock_acquire_default(executing, &lock_context); |
---|
[8475e7a] | 644 | |
---|
| 645 | unblock = false; |
---|
| 646 | switch (td->td_sq_state) { |
---|
| 647 | case TD_SQ_NIGHTMARE: |
---|
| 648 | BSD_ASSERT(td->td_wchan == wchan); |
---|
| 649 | td->td_sq_state = TD_SQ_PANIC; |
---|
| 650 | unblock = true; |
---|
| 651 | remove = true; |
---|
| 652 | break; |
---|
| 653 | case TD_SQ_WAKEUP: |
---|
| 654 | BSD_ASSERT(td->td_wchan == NULL); |
---|
| 655 | unblock = true; |
---|
| 656 | break; |
---|
| 657 | default: |
---|
| 658 | BSD_ASSERT(td->td_wchan == wchan); |
---|
| 659 | BSD_ASSERT(td->td_sq_state == TD_SQ_SLEEPY); |
---|
| 660 | td->td_sq_state = TD_SQ_SLEEPING; |
---|
| 661 | break; |
---|
| 662 | } |
---|
| 663 | |
---|
[67f8497] | 664 | _Thread_Lock_release_default(executing, &lock_context); |
---|
[8475e7a] | 665 | |
---|
| 666 | if (unblock) { |
---|
[1ee85a5] | 667 | _Watchdog_Remove_ticks(&executing->Timer); |
---|
[8475e7a] | 668 | _Thread_Clear_state(executing, STATES_WAITING_FOR_BSD_WAKEUP); |
---|
| 669 | } |
---|
| 670 | |
---|
| 671 | _Thread_Dispatch_enable(cpu_self); |
---|
| 672 | |
---|
[67f8497] | 673 | _Thread_Lock_acquire_default(executing, &lock_context); |
---|
[8475e7a] | 674 | |
---|
| 675 | switch (td->td_sq_state) { |
---|
| 676 | case TD_SQ_NIGHTMARE: |
---|
| 677 | BSD_ASSERT(td->td_wchan == wchan); |
---|
| 678 | td->td_sq_state = TD_SQ_PANIC; |
---|
| 679 | remove = true; |
---|
| 680 | break; |
---|
| 681 | default: |
---|
| 682 | BSD_ASSERT(td->td_sq_state == TD_SQ_WAKEUP || |
---|
| 683 | td->td_sq_state == TD_SQ_PANIC); |
---|
| 684 | break; |
---|
| 685 | } |
---|
| 686 | } |
---|
| 687 | |
---|
[67f8497] | 688 | _Thread_Lock_release_default(executing, &lock_context); |
---|
[8475e7a] | 689 | |
---|
| 690 | if (remove) { |
---|
| 691 | sleepq_remove(td, wchan); |
---|
| 692 | } |
---|
| 693 | #endif /* __rtems__ */ |
---|
[9975839] | 694 | } |
---|
| 695 | |
---|
| 696 | /* |
---|
| 697 | * Check to see if we timed out. |
---|
| 698 | */ |
---|
| 699 | static int |
---|
| 700 | sleepq_check_timeout(void) |
---|
| 701 | { |
---|
| 702 | struct thread *td; |
---|
| 703 | |
---|
| 704 | td = curthread; |
---|
[8475e7a] | 705 | #ifndef __rtems__ |
---|
[9975839] | 706 | THREAD_LOCK_ASSERT(td, MA_OWNED); |
---|
| 707 | |
---|
| 708 | /* |
---|
| 709 | * If TDF_TIMEOUT is set, we timed out. |
---|
| 710 | */ |
---|
| 711 | if (td->td_flags & TDF_TIMEOUT) { |
---|
| 712 | td->td_flags &= ~TDF_TIMEOUT; |
---|
| 713 | return (EWOULDBLOCK); |
---|
| 714 | } |
---|
| 715 | |
---|
| 716 | /* |
---|
| 717 | * If TDF_TIMOFAIL is set, the timeout ran after we had |
---|
| 718 | * already been woken up. |
---|
| 719 | */ |
---|
| 720 | if (td->td_flags & TDF_TIMOFAIL) |
---|
| 721 | td->td_flags &= ~TDF_TIMOFAIL; |
---|
| 722 | |
---|
| 723 | /* |
---|
| 724 | * If callout_stop() fails, then the timeout is running on |
---|
| 725 | * another CPU, so synchronize with it to avoid having it |
---|
| 726 | * accidentally wake up a subsequent sleep. |
---|
| 727 | */ |
---|
| 728 | else if (callout_stop(&td->td_slpcallout) == 0) { |
---|
| 729 | td->td_flags |= TDF_TIMEOUT; |
---|
| 730 | TD_SET_SLEEPING(td); |
---|
| 731 | mi_switch(SW_INVOL | SWT_SLEEPQTIMO, NULL); |
---|
| 732 | } |
---|
| 733 | return (0); |
---|
[8475e7a] | 734 | #else /* __rtems__ */ |
---|
| 735 | return (td->td_sq_state); |
---|
| 736 | #endif /* __rtems__ */ |
---|
[9975839] | 737 | } |
---|
| 738 | |
---|
[8475e7a] | 739 | #ifndef __rtems__ |
---|
[9975839] | 740 | /* |
---|
| 741 | * Check to see if we were awoken by a signal. |
---|
| 742 | */ |
---|
| 743 | static int |
---|
| 744 | sleepq_check_signals(void) |
---|
| 745 | { |
---|
| 746 | struct thread *td; |
---|
| 747 | |
---|
| 748 | td = curthread; |
---|
| 749 | THREAD_LOCK_ASSERT(td, MA_OWNED); |
---|
| 750 | |
---|
| 751 | /* We are no longer in an interruptible sleep. */ |
---|
| 752 | if (td->td_flags & TDF_SINTR) |
---|
| 753 | td->td_flags &= ~TDF_SINTR; |
---|
| 754 | |
---|
| 755 | if (td->td_flags & TDF_SLEEPABORT) { |
---|
| 756 | td->td_flags &= ~TDF_SLEEPABORT; |
---|
| 757 | return (td->td_intrval); |
---|
| 758 | } |
---|
| 759 | |
---|
| 760 | return (0); |
---|
| 761 | } |
---|
[8475e7a] | 762 | #endif /* __rtems__ */ |
---|
[9975839] | 763 | |
---|
| 764 | /* |
---|
| 765 | * Block the current thread until it is awakened from its sleep queue. |
---|
| 766 | */ |
---|
| 767 | void |
---|
| 768 | sleepq_wait(void *wchan, int pri) |
---|
| 769 | { |
---|
[8475e7a] | 770 | #ifndef __rtems__ |
---|
[9975839] | 771 | struct thread *td; |
---|
| 772 | |
---|
| 773 | td = curthread; |
---|
| 774 | MPASS(!(td->td_flags & TDF_SINTR)); |
---|
| 775 | thread_lock(td); |
---|
[8475e7a] | 776 | #endif /* __rtems__ */ |
---|
[9975839] | 777 | sleepq_switch(wchan, pri); |
---|
[8475e7a] | 778 | #ifndef __rtems__ |
---|
[9975839] | 779 | thread_unlock(td); |
---|
[8475e7a] | 780 | #endif /* __rtems__ */ |
---|
[9975839] | 781 | } |
---|
| 782 | |
---|
[8475e7a] | 783 | #ifndef __rtems__ |
---|
[9975839] | 784 | /* |
---|
| 785 | * Block the current thread until it is awakened from its sleep queue |
---|
| 786 | * or it is interrupted by a signal. |
---|
| 787 | */ |
---|
| 788 | int |
---|
| 789 | sleepq_wait_sig(void *wchan, int pri) |
---|
| 790 | { |
---|
| 791 | int rcatch; |
---|
| 792 | int rval; |
---|
| 793 | |
---|
| 794 | rcatch = sleepq_catch_signals(wchan, pri); |
---|
| 795 | rval = sleepq_check_signals(); |
---|
| 796 | thread_unlock(curthread); |
---|
| 797 | if (rcatch) |
---|
| 798 | return (rcatch); |
---|
| 799 | return (rval); |
---|
| 800 | } |
---|
[8475e7a] | 801 | #endif /* __rtems__ */ |
---|
[9975839] | 802 | |
---|
| 803 | /* |
---|
| 804 | * Block the current thread until it is awakened from its sleep queue |
---|
| 805 | * or it times out while waiting. |
---|
| 806 | */ |
---|
| 807 | int |
---|
| 808 | sleepq_timedwait(void *wchan, int pri) |
---|
| 809 | { |
---|
[8475e7a] | 810 | #ifndef __rtems__ |
---|
[9975839] | 811 | struct thread *td; |
---|
[8475e7a] | 812 | #endif /* __rtems__ */ |
---|
[9975839] | 813 | int rval; |
---|
| 814 | |
---|
[8475e7a] | 815 | #ifndef __rtems__ |
---|
[9975839] | 816 | td = curthread; |
---|
| 817 | MPASS(!(td->td_flags & TDF_SINTR)); |
---|
| 818 | thread_lock(td); |
---|
[8475e7a] | 819 | #endif /* __rtems__ */ |
---|
[9975839] | 820 | sleepq_switch(wchan, pri); |
---|
| 821 | rval = sleepq_check_timeout(); |
---|
[8475e7a] | 822 | #ifndef __rtems__ |
---|
[9975839] | 823 | thread_unlock(td); |
---|
[8475e7a] | 824 | #endif /* __rtems__ */ |
---|
[9975839] | 825 | |
---|
| 826 | return (rval); |
---|
| 827 | } |
---|
| 828 | |
---|
[8475e7a] | 829 | #ifndef __rtems__ |
---|
[9975839] | 830 | /* |
---|
| 831 | * Block the current thread until it is awakened from its sleep queue, |
---|
| 832 | * it is interrupted by a signal, or it times out waiting to be awakened. |
---|
| 833 | */ |
---|
| 834 | int |
---|
| 835 | sleepq_timedwait_sig(void *wchan, int pri) |
---|
| 836 | { |
---|
| 837 | int rcatch, rvalt, rvals; |
---|
| 838 | |
---|
| 839 | rcatch = sleepq_catch_signals(wchan, pri); |
---|
| 840 | rvalt = sleepq_check_timeout(); |
---|
| 841 | rvals = sleepq_check_signals(); |
---|
| 842 | thread_unlock(curthread); |
---|
| 843 | if (rcatch) |
---|
| 844 | return (rcatch); |
---|
| 845 | if (rvals) |
---|
| 846 | return (rvals); |
---|
| 847 | return (rvalt); |
---|
| 848 | } |
---|
[8475e7a] | 849 | #endif /* __rtems__ */ |
---|
[9975839] | 850 | |
---|
| 851 | /* |
---|
| 852 | * Returns the type of sleepqueue given a waitchannel. |
---|
| 853 | */ |
---|
| 854 | int |
---|
| 855 | sleepq_type(void *wchan) |
---|
| 856 | { |
---|
| 857 | struct sleepqueue *sq; |
---|
| 858 | int type; |
---|
| 859 | |
---|
| 860 | MPASS(wchan != NULL); |
---|
| 861 | |
---|
| 862 | sleepq_lock(wchan); |
---|
| 863 | sq = sleepq_lookup(wchan); |
---|
| 864 | if (sq == NULL) { |
---|
| 865 | sleepq_release(wchan); |
---|
| 866 | return (-1); |
---|
| 867 | } |
---|
| 868 | type = sq->sq_type; |
---|
| 869 | sleepq_release(wchan); |
---|
| 870 | return (type); |
---|
| 871 | } |
---|
| 872 | |
---|
| 873 | /* |
---|
| 874 | * Removes a thread from a sleep queue and makes it |
---|
| 875 | * runnable. |
---|
| 876 | */ |
---|
| 877 | static int |
---|
| 878 | sleepq_resume_thread(struct sleepqueue *sq, struct thread *td, int pri) |
---|
| 879 | { |
---|
| 880 | struct sleepqueue_chain *sc; |
---|
[8475e7a] | 881 | #ifdef __rtems__ |
---|
| 882 | Thread_Control *thread; |
---|
| 883 | ISR_lock_Context lock_context; |
---|
| 884 | bool unblock; |
---|
| 885 | |
---|
| 886 | BSD_ASSERT(sq != NULL); |
---|
| 887 | #endif /* __rtems__ */ |
---|
[9975839] | 888 | |
---|
| 889 | MPASS(td != NULL); |
---|
| 890 | MPASS(sq->sq_wchan != NULL); |
---|
| 891 | MPASS(td->td_wchan == sq->sq_wchan); |
---|
| 892 | MPASS(td->td_sqqueue < NR_SLEEPQS && td->td_sqqueue >= 0); |
---|
| 893 | THREAD_LOCK_ASSERT(td, MA_OWNED); |
---|
| 894 | sc = SC_LOOKUP(sq->sq_wchan); |
---|
| 895 | mtx_assert(&sc->sc_lock, MA_OWNED); |
---|
| 896 | |
---|
| 897 | SDT_PROBE2(sched, , , wakeup, td, td->td_proc); |
---|
| 898 | |
---|
| 899 | /* Remove the thread from the queue. */ |
---|
| 900 | sq->sq_blockedcnt[td->td_sqqueue]--; |
---|
| 901 | TAILQ_REMOVE(&sq->sq_blocked[td->td_sqqueue], td, td_slpq); |
---|
| 902 | |
---|
| 903 | /* |
---|
| 904 | * Get a sleep queue for this thread. If this is the last waiter, |
---|
| 905 | * use the queue itself and take it out of the chain, otherwise, |
---|
| 906 | * remove a queue from the free list. |
---|
| 907 | */ |
---|
| 908 | if (LIST_EMPTY(&sq->sq_free)) { |
---|
| 909 | td->td_sleepqueue = sq; |
---|
| 910 | #ifdef INVARIANTS |
---|
| 911 | sq->sq_wchan = NULL; |
---|
| 912 | #endif |
---|
| 913 | #ifdef SLEEPQUEUE_PROFILING |
---|
| 914 | sc->sc_depth--; |
---|
| 915 | #endif |
---|
| 916 | } else |
---|
| 917 | td->td_sleepqueue = LIST_FIRST(&sq->sq_free); |
---|
| 918 | LIST_REMOVE(td->td_sleepqueue, sq_hash); |
---|
[8475e7a] | 919 | #ifdef __rtems__ |
---|
| 920 | (void)sc; |
---|
| 921 | thread = td->td_thread; |
---|
[67f8497] | 922 | _Thread_Lock_acquire_default(thread, &lock_context); |
---|
[8475e7a] | 923 | #endif /* __rtems__ */ |
---|
[9975839] | 924 | |
---|
| 925 | td->td_wmesg = NULL; |
---|
| 926 | td->td_wchan = NULL; |
---|
[8475e7a] | 927 | #ifndef __rtems__ |
---|
[9975839] | 928 | td->td_flags &= ~TDF_SINTR; |
---|
| 929 | |
---|
| 930 | CTR3(KTR_PROC, "sleepq_wakeup: thread %p (pid %ld, %s)", |
---|
| 931 | (void *)td, (long)td->td_proc->p_pid, td->td_name); |
---|
| 932 | |
---|
| 933 | /* Adjust priority if requested. */ |
---|
| 934 | MPASS(pri == 0 || (pri >= PRI_MIN && pri <= PRI_MAX)); |
---|
| 935 | if (pri != 0 && td->td_priority > pri && |
---|
| 936 | PRI_BASE(td->td_pri_class) == PRI_TIMESHARE) |
---|
| 937 | sched_prio(td, pri); |
---|
| 938 | |
---|
| 939 | /* |
---|
| 940 | * Note that thread td might not be sleeping if it is running |
---|
| 941 | * sleepq_catch_signals() on another CPU or is blocked on its |
---|
| 942 | * proc lock to check signals. There's no need to mark the |
---|
| 943 | * thread runnable in that case. |
---|
| 944 | */ |
---|
| 945 | if (TD_IS_SLEEPING(td)) { |
---|
| 946 | TD_CLR_SLEEPING(td); |
---|
| 947 | return (setrunnable(td)); |
---|
| 948 | } |
---|
[8475e7a] | 949 | #else /* __rtems__ */ |
---|
| 950 | unblock = _Watchdog_Is_active(&thread->Timer); |
---|
| 951 | switch (td->td_sq_state) { |
---|
| 952 | case TD_SQ_SLEEPING: |
---|
| 953 | unblock = true; |
---|
| 954 | /* FALLTHROUGH */ |
---|
| 955 | case TD_SQ_TIRED: |
---|
| 956 | case TD_SQ_SLEEPY: |
---|
| 957 | case TD_SQ_NIGHTMARE: |
---|
| 958 | td->td_sq_state = TD_SQ_WAKEUP; |
---|
| 959 | break; |
---|
| 960 | default: |
---|
| 961 | BSD_ASSERT(td->td_sq_state == TD_SQ_PANIC); |
---|
| 962 | break; |
---|
| 963 | } |
---|
| 964 | |
---|
| 965 | if (unblock) { |
---|
| 966 | Per_CPU_Control *cpu_self; |
---|
| 967 | |
---|
[67f8497] | 968 | cpu_self = _Thread_Dispatch_disable_critical(); |
---|
| 969 | _Thread_Lock_release_default(thread, &lock_context); |
---|
[8475e7a] | 970 | |
---|
[1ee85a5] | 971 | _Watchdog_Remove_ticks(&thread->Timer); |
---|
[8475e7a] | 972 | _Thread_Clear_state(thread, STATES_WAITING_FOR_BSD_WAKEUP); |
---|
| 973 | |
---|
| 974 | _Thread_Dispatch_enable(cpu_self); |
---|
| 975 | } else { |
---|
[67f8497] | 976 | _Thread_Lock_release_default(thread, &lock_context); |
---|
[8475e7a] | 977 | } |
---|
| 978 | #endif /* __rtems__ */ |
---|
[9975839] | 979 | return (0); |
---|
| 980 | } |
---|
| 981 | |
---|
| 982 | #ifdef INVARIANTS |
---|
| 983 | /* |
---|
| 984 | * UMA zone item deallocator. |
---|
| 985 | */ |
---|
| 986 | static void |
---|
| 987 | sleepq_dtor(void *mem, int size, void *arg) |
---|
| 988 | { |
---|
| 989 | struct sleepqueue *sq; |
---|
| 990 | int i; |
---|
| 991 | |
---|
| 992 | sq = mem; |
---|
| 993 | for (i = 0; i < NR_SLEEPQS; i++) { |
---|
| 994 | MPASS(TAILQ_EMPTY(&sq->sq_blocked[i])); |
---|
| 995 | MPASS(sq->sq_blockedcnt[i] == 0); |
---|
| 996 | } |
---|
| 997 | } |
---|
| 998 | #endif |
---|
| 999 | |
---|
| 1000 | /* |
---|
| 1001 | * UMA zone item initializer. |
---|
| 1002 | */ |
---|
| 1003 | static int |
---|
| 1004 | sleepq_init(void *mem, int size, int flags) |
---|
| 1005 | { |
---|
| 1006 | struct sleepqueue *sq; |
---|
| 1007 | int i; |
---|
| 1008 | |
---|
| 1009 | bzero(mem, size); |
---|
| 1010 | sq = mem; |
---|
| 1011 | for (i = 0; i < NR_SLEEPQS; i++) { |
---|
| 1012 | TAILQ_INIT(&sq->sq_blocked[i]); |
---|
| 1013 | sq->sq_blockedcnt[i] = 0; |
---|
| 1014 | } |
---|
| 1015 | LIST_INIT(&sq->sq_free); |
---|
| 1016 | return (0); |
---|
| 1017 | } |
---|
| 1018 | |
---|
| 1019 | /* |
---|
| 1020 | * Find the highest priority thread sleeping on a wait channel and resume it. |
---|
| 1021 | */ |
---|
| 1022 | int |
---|
| 1023 | sleepq_signal(void *wchan, int flags, int pri, int queue) |
---|
| 1024 | { |
---|
| 1025 | struct sleepqueue *sq; |
---|
[8475e7a] | 1026 | #ifndef __rtems__ |
---|
[9975839] | 1027 | struct thread *td, *besttd; |
---|
[8475e7a] | 1028 | #else /* __rtems__ */ |
---|
| 1029 | struct thread *besttd; |
---|
| 1030 | #endif /* __rtems__ */ |
---|
[9975839] | 1031 | int wakeup_swapper; |
---|
| 1032 | |
---|
| 1033 | CTR2(KTR_PROC, "sleepq_signal(%p, %d)", wchan, flags); |
---|
| 1034 | KASSERT(wchan != NULL, ("%s: invalid NULL wait channel", __func__)); |
---|
| 1035 | MPASS((queue >= 0) && (queue < NR_SLEEPQS)); |
---|
| 1036 | sq = sleepq_lookup(wchan); |
---|
| 1037 | if (sq == NULL) |
---|
| 1038 | return (0); |
---|
| 1039 | KASSERT(sq->sq_type == (flags & SLEEPQ_TYPE), |
---|
| 1040 | ("%s: mismatch between sleep/wakeup and cv_*", __func__)); |
---|
| 1041 | |
---|
[8475e7a] | 1042 | #ifndef __rtems__ |
---|
[9975839] | 1043 | /* |
---|
| 1044 | * Find the highest priority thread on the queue. If there is a |
---|
| 1045 | * tie, use the thread that first appears in the queue as it has |
---|
| 1046 | * been sleeping the longest since threads are always added to |
---|
| 1047 | * the tail of sleep queues. |
---|
| 1048 | */ |
---|
| 1049 | besttd = NULL; |
---|
| 1050 | TAILQ_FOREACH(td, &sq->sq_blocked[queue], td_slpq) { |
---|
| 1051 | if (besttd == NULL || td->td_priority < besttd->td_priority) |
---|
| 1052 | besttd = td; |
---|
| 1053 | } |
---|
[8475e7a] | 1054 | #else /* __rtems__ */ |
---|
| 1055 | besttd = TAILQ_FIRST(&sq->sq_blocked[queue]); |
---|
| 1056 | #endif /* __rtems__ */ |
---|
[9975839] | 1057 | MPASS(besttd != NULL); |
---|
| 1058 | thread_lock(besttd); |
---|
| 1059 | wakeup_swapper = sleepq_resume_thread(sq, besttd, pri); |
---|
| 1060 | thread_unlock(besttd); |
---|
| 1061 | return (wakeup_swapper); |
---|
| 1062 | } |
---|
| 1063 | |
---|
| 1064 | /* |
---|
| 1065 | * Resume all threads sleeping on a specified wait channel. |
---|
| 1066 | */ |
---|
| 1067 | int |
---|
| 1068 | sleepq_broadcast(void *wchan, int flags, int pri, int queue) |
---|
| 1069 | { |
---|
| 1070 | struct sleepqueue *sq; |
---|
| 1071 | struct thread *td, *tdn; |
---|
| 1072 | int wakeup_swapper; |
---|
| 1073 | |
---|
| 1074 | CTR2(KTR_PROC, "sleepq_broadcast(%p, %d)", wchan, flags); |
---|
| 1075 | KASSERT(wchan != NULL, ("%s: invalid NULL wait channel", __func__)); |
---|
| 1076 | MPASS((queue >= 0) && (queue < NR_SLEEPQS)); |
---|
| 1077 | sq = sleepq_lookup(wchan); |
---|
| 1078 | if (sq == NULL) |
---|
| 1079 | return (0); |
---|
| 1080 | KASSERT(sq->sq_type == (flags & SLEEPQ_TYPE), |
---|
| 1081 | ("%s: mismatch between sleep/wakeup and cv_*", __func__)); |
---|
| 1082 | |
---|
| 1083 | /* Resume all blocked threads on the sleep queue. */ |
---|
| 1084 | wakeup_swapper = 0; |
---|
| 1085 | TAILQ_FOREACH_SAFE(td, &sq->sq_blocked[queue], td_slpq, tdn) { |
---|
| 1086 | thread_lock(td); |
---|
| 1087 | if (sleepq_resume_thread(sq, td, pri)) |
---|
| 1088 | wakeup_swapper = 1; |
---|
| 1089 | thread_unlock(td); |
---|
| 1090 | } |
---|
| 1091 | return (wakeup_swapper); |
---|
| 1092 | } |
---|
| 1093 | |
---|
[8475e7a] | 1094 | #ifndef __rtems__ |
---|
[9975839] | 1095 | /* |
---|
| 1096 | * Time sleeping threads out. When the timeout expires, the thread is |
---|
| 1097 | * removed from the sleep queue and made runnable if it is still asleep. |
---|
| 1098 | */ |
---|
| 1099 | static void |
---|
| 1100 | sleepq_timeout(void *arg) |
---|
| 1101 | { |
---|
| 1102 | struct sleepqueue_chain *sc; |
---|
| 1103 | struct sleepqueue *sq; |
---|
| 1104 | struct thread *td; |
---|
| 1105 | void *wchan; |
---|
| 1106 | int wakeup_swapper; |
---|
| 1107 | |
---|
| 1108 | td = arg; |
---|
| 1109 | wakeup_swapper = 0; |
---|
| 1110 | CTR3(KTR_PROC, "sleepq_timeout: thread %p (pid %ld, %s)", |
---|
| 1111 | (void *)td, (long)td->td_proc->p_pid, (void *)td->td_name); |
---|
| 1112 | |
---|
| 1113 | /* |
---|
| 1114 | * First, see if the thread is asleep and get the wait channel if |
---|
| 1115 | * it is. |
---|
| 1116 | */ |
---|
| 1117 | thread_lock(td); |
---|
| 1118 | if (TD_IS_SLEEPING(td) && TD_ON_SLEEPQ(td)) { |
---|
| 1119 | wchan = td->td_wchan; |
---|
| 1120 | sc = SC_LOOKUP(wchan); |
---|
| 1121 | THREAD_LOCKPTR_ASSERT(td, &sc->sc_lock); |
---|
| 1122 | sq = sleepq_lookup(wchan); |
---|
| 1123 | MPASS(sq != NULL); |
---|
| 1124 | td->td_flags |= TDF_TIMEOUT; |
---|
| 1125 | wakeup_swapper = sleepq_resume_thread(sq, td, 0); |
---|
| 1126 | thread_unlock(td); |
---|
| 1127 | if (wakeup_swapper) |
---|
| 1128 | kick_proc0(); |
---|
| 1129 | return; |
---|
| 1130 | } |
---|
| 1131 | |
---|
| 1132 | /* |
---|
| 1133 | * If the thread is on the SLEEPQ but isn't sleeping yet, it |
---|
| 1134 | * can either be on another CPU in between sleepq_add() and |
---|
| 1135 | * one of the sleepq_*wait*() routines or it can be in |
---|
| 1136 | * sleepq_catch_signals(). |
---|
| 1137 | */ |
---|
| 1138 | if (TD_ON_SLEEPQ(td)) { |
---|
| 1139 | td->td_flags |= TDF_TIMEOUT; |
---|
| 1140 | thread_unlock(td); |
---|
| 1141 | return; |
---|
| 1142 | } |
---|
| 1143 | |
---|
| 1144 | /* |
---|
| 1145 | * Now check for the edge cases. First, if TDF_TIMEOUT is set, |
---|
| 1146 | * then the other thread has already yielded to us, so clear |
---|
| 1147 | * the flag and resume it. If TDF_TIMEOUT is not set, then the |
---|
| 1148 | * we know that the other thread is not on a sleep queue, but it |
---|
| 1149 | * hasn't resumed execution yet. In that case, set TDF_TIMOFAIL |
---|
| 1150 | * to let it know that the timeout has already run and doesn't |
---|
| 1151 | * need to be canceled. |
---|
| 1152 | */ |
---|
| 1153 | if (td->td_flags & TDF_TIMEOUT) { |
---|
| 1154 | MPASS(TD_IS_SLEEPING(td)); |
---|
| 1155 | td->td_flags &= ~TDF_TIMEOUT; |
---|
| 1156 | TD_CLR_SLEEPING(td); |
---|
| 1157 | wakeup_swapper = setrunnable(td); |
---|
| 1158 | } else |
---|
| 1159 | td->td_flags |= TDF_TIMOFAIL; |
---|
| 1160 | thread_unlock(td); |
---|
| 1161 | if (wakeup_swapper) |
---|
| 1162 | kick_proc0(); |
---|
| 1163 | } |
---|
[8475e7a] | 1164 | #else /* __rtems__ */ |
---|
| 1165 | static void |
---|
| 1166 | sleepq_timeout(Objects_Id id, void *arg) |
---|
| 1167 | { |
---|
| 1168 | Thread_Control *thread; |
---|
| 1169 | struct thread *td; |
---|
| 1170 | ISR_lock_Context lock_context; |
---|
| 1171 | bool unblock; |
---|
| 1172 | |
---|
| 1173 | thread = arg; |
---|
| 1174 | td = rtems_bsd_get_thread(thread); |
---|
| 1175 | BSD_ASSERT(td != NULL); |
---|
| 1176 | |
---|
[67f8497] | 1177 | _Thread_Lock_acquire_default(thread, &lock_context); |
---|
[8475e7a] | 1178 | |
---|
| 1179 | unblock = false; |
---|
| 1180 | switch (td->td_sq_state) { |
---|
| 1181 | case TD_SQ_SLEEPING: |
---|
| 1182 | unblock = true; |
---|
| 1183 | /* Fall through */ |
---|
| 1184 | case TD_SQ_TIRED: |
---|
| 1185 | case TD_SQ_SLEEPY: |
---|
| 1186 | td->td_sq_state = TD_SQ_NIGHTMARE; |
---|
| 1187 | break; |
---|
| 1188 | default: |
---|
| 1189 | BSD_ASSERT(td->td_sq_state == TD_SQ_WAKEUP); |
---|
| 1190 | break; |
---|
| 1191 | } |
---|
| 1192 | |
---|
| 1193 | if (unblock) { |
---|
| 1194 | Per_CPU_Control *cpu_self; |
---|
| 1195 | |
---|
[67f8497] | 1196 | cpu_self = _Thread_Dispatch_disable_critical(); |
---|
| 1197 | _Thread_Lock_release_default(thread, &lock_context); |
---|
[8475e7a] | 1198 | |
---|
| 1199 | _Thread_Clear_state(thread, STATES_WAITING_FOR_BSD_WAKEUP); |
---|
| 1200 | |
---|
| 1201 | _Thread_Dispatch_enable(cpu_self); |
---|
| 1202 | } else { |
---|
[67f8497] | 1203 | _Thread_Lock_release_default(thread, &lock_context); |
---|
[8475e7a] | 1204 | } |
---|
| 1205 | } |
---|
| 1206 | #endif /* __rtems__ */ |
---|
[9975839] | 1207 | |
---|
| 1208 | /* |
---|
| 1209 | * Resumes a specific thread from the sleep queue associated with a specific |
---|
| 1210 | * wait channel if it is on that queue. |
---|
| 1211 | */ |
---|
| 1212 | void |
---|
| 1213 | sleepq_remove(struct thread *td, void *wchan) |
---|
| 1214 | { |
---|
| 1215 | struct sleepqueue *sq; |
---|
| 1216 | int wakeup_swapper; |
---|
| 1217 | |
---|
| 1218 | /* |
---|
| 1219 | * Look up the sleep queue for this wait channel, then re-check |
---|
| 1220 | * that the thread is asleep on that channel, if it is not, then |
---|
| 1221 | * bail. |
---|
| 1222 | */ |
---|
| 1223 | MPASS(wchan != NULL); |
---|
| 1224 | sleepq_lock(wchan); |
---|
| 1225 | sq = sleepq_lookup(wchan); |
---|
| 1226 | /* |
---|
| 1227 | * We can not lock the thread here as it may be sleeping on a |
---|
| 1228 | * different sleepq. However, holding the sleepq lock for this |
---|
| 1229 | * wchan can guarantee that we do not miss a wakeup for this |
---|
| 1230 | * channel. The asserts below will catch any false positives. |
---|
| 1231 | */ |
---|
| 1232 | if (!TD_ON_SLEEPQ(td) || td->td_wchan != wchan) { |
---|
| 1233 | sleepq_release(wchan); |
---|
| 1234 | return; |
---|
| 1235 | } |
---|
| 1236 | /* Thread is asleep on sleep queue sq, so wake it up. */ |
---|
| 1237 | thread_lock(td); |
---|
| 1238 | MPASS(sq != NULL); |
---|
| 1239 | MPASS(td->td_wchan == wchan); |
---|
| 1240 | wakeup_swapper = sleepq_resume_thread(sq, td, 0); |
---|
| 1241 | thread_unlock(td); |
---|
| 1242 | sleepq_release(wchan); |
---|
| 1243 | if (wakeup_swapper) |
---|
| 1244 | kick_proc0(); |
---|
| 1245 | } |
---|
| 1246 | |
---|
[8475e7a] | 1247 | #ifndef __rtems__ |
---|
[9975839] | 1248 | /* |
---|
| 1249 | * Abort a thread as if an interrupt had occurred. Only abort |
---|
| 1250 | * interruptible waits (unfortunately it isn't safe to abort others). |
---|
| 1251 | */ |
---|
| 1252 | int |
---|
| 1253 | sleepq_abort(struct thread *td, int intrval) |
---|
| 1254 | { |
---|
| 1255 | struct sleepqueue *sq; |
---|
| 1256 | void *wchan; |
---|
| 1257 | |
---|
| 1258 | THREAD_LOCK_ASSERT(td, MA_OWNED); |
---|
| 1259 | MPASS(TD_ON_SLEEPQ(td)); |
---|
| 1260 | MPASS(td->td_flags & TDF_SINTR); |
---|
| 1261 | MPASS(intrval == EINTR || intrval == ERESTART); |
---|
| 1262 | |
---|
| 1263 | /* |
---|
| 1264 | * If the TDF_TIMEOUT flag is set, just leave. A |
---|
| 1265 | * timeout is scheduled anyhow. |
---|
| 1266 | */ |
---|
| 1267 | if (td->td_flags & TDF_TIMEOUT) |
---|
| 1268 | return (0); |
---|
| 1269 | |
---|
| 1270 | CTR3(KTR_PROC, "sleepq_abort: thread %p (pid %ld, %s)", |
---|
| 1271 | (void *)td, (long)td->td_proc->p_pid, (void *)td->td_name); |
---|
| 1272 | td->td_intrval = intrval; |
---|
| 1273 | td->td_flags |= TDF_SLEEPABORT; |
---|
| 1274 | /* |
---|
| 1275 | * If the thread has not slept yet it will find the signal in |
---|
| 1276 | * sleepq_catch_signals() and call sleepq_resume_thread. Otherwise |
---|
| 1277 | * we have to do it here. |
---|
| 1278 | */ |
---|
| 1279 | if (!TD_IS_SLEEPING(td)) |
---|
| 1280 | return (0); |
---|
| 1281 | wchan = td->td_wchan; |
---|
| 1282 | MPASS(wchan != NULL); |
---|
| 1283 | sq = sleepq_lookup(wchan); |
---|
| 1284 | MPASS(sq != NULL); |
---|
| 1285 | |
---|
| 1286 | /* Thread is asleep on sleep queue sq, so wake it up. */ |
---|
| 1287 | return (sleepq_resume_thread(sq, td, 0)); |
---|
| 1288 | } |
---|
[8475e7a] | 1289 | #endif /* __rtems__ */ |
---|
[9975839] | 1290 | |
---|
| 1291 | #ifdef SLEEPQUEUE_PROFILING |
---|
| 1292 | #define SLEEPQ_PROF_LOCATIONS 1024 |
---|
| 1293 | #define SLEEPQ_SBUFSIZE 512 |
---|
| 1294 | struct sleepq_prof { |
---|
| 1295 | LIST_ENTRY(sleepq_prof) sp_link; |
---|
| 1296 | const char *sp_wmesg; |
---|
| 1297 | long sp_count; |
---|
| 1298 | }; |
---|
| 1299 | |
---|
| 1300 | LIST_HEAD(sqphead, sleepq_prof); |
---|
| 1301 | |
---|
| 1302 | struct sqphead sleepq_prof_free; |
---|
| 1303 | struct sqphead sleepq_hash[SC_TABLESIZE]; |
---|
| 1304 | static struct sleepq_prof sleepq_profent[SLEEPQ_PROF_LOCATIONS]; |
---|
| 1305 | static struct mtx sleepq_prof_lock; |
---|
| 1306 | MTX_SYSINIT(sleepq_prof_lock, &sleepq_prof_lock, "sleepq_prof", MTX_SPIN); |
---|
| 1307 | |
---|
| 1308 | static void |
---|
| 1309 | sleepq_profile(const char *wmesg) |
---|
| 1310 | { |
---|
| 1311 | struct sleepq_prof *sp; |
---|
| 1312 | |
---|
| 1313 | mtx_lock_spin(&sleepq_prof_lock); |
---|
| 1314 | if (prof_enabled == 0) |
---|
| 1315 | goto unlock; |
---|
| 1316 | LIST_FOREACH(sp, &sleepq_hash[SC_HASH(wmesg)], sp_link) |
---|
| 1317 | if (sp->sp_wmesg == wmesg) |
---|
| 1318 | goto done; |
---|
| 1319 | sp = LIST_FIRST(&sleepq_prof_free); |
---|
| 1320 | if (sp == NULL) |
---|
| 1321 | goto unlock; |
---|
| 1322 | sp->sp_wmesg = wmesg; |
---|
| 1323 | LIST_REMOVE(sp, sp_link); |
---|
| 1324 | LIST_INSERT_HEAD(&sleepq_hash[SC_HASH(wmesg)], sp, sp_link); |
---|
| 1325 | done: |
---|
| 1326 | sp->sp_count++; |
---|
| 1327 | unlock: |
---|
| 1328 | mtx_unlock_spin(&sleepq_prof_lock); |
---|
| 1329 | return; |
---|
| 1330 | } |
---|
| 1331 | |
---|
| 1332 | static void |
---|
| 1333 | sleepq_prof_reset(void) |
---|
| 1334 | { |
---|
| 1335 | struct sleepq_prof *sp; |
---|
| 1336 | int enabled; |
---|
| 1337 | int i; |
---|
| 1338 | |
---|
| 1339 | mtx_lock_spin(&sleepq_prof_lock); |
---|
| 1340 | enabled = prof_enabled; |
---|
| 1341 | prof_enabled = 0; |
---|
| 1342 | for (i = 0; i < SC_TABLESIZE; i++) |
---|
| 1343 | LIST_INIT(&sleepq_hash[i]); |
---|
| 1344 | LIST_INIT(&sleepq_prof_free); |
---|
| 1345 | for (i = 0; i < SLEEPQ_PROF_LOCATIONS; i++) { |
---|
| 1346 | sp = &sleepq_profent[i]; |
---|
| 1347 | sp->sp_wmesg = NULL; |
---|
| 1348 | sp->sp_count = 0; |
---|
| 1349 | LIST_INSERT_HEAD(&sleepq_prof_free, sp, sp_link); |
---|
| 1350 | } |
---|
| 1351 | prof_enabled = enabled; |
---|
| 1352 | mtx_unlock_spin(&sleepq_prof_lock); |
---|
| 1353 | } |
---|
| 1354 | |
---|
| 1355 | static int |
---|
| 1356 | enable_sleepq_prof(SYSCTL_HANDLER_ARGS) |
---|
| 1357 | { |
---|
| 1358 | int error, v; |
---|
| 1359 | |
---|
| 1360 | v = prof_enabled; |
---|
| 1361 | error = sysctl_handle_int(oidp, &v, v, req); |
---|
| 1362 | if (error) |
---|
| 1363 | return (error); |
---|
| 1364 | if (req->newptr == NULL) |
---|
| 1365 | return (error); |
---|
| 1366 | if (v == prof_enabled) |
---|
| 1367 | return (0); |
---|
| 1368 | if (v == 1) |
---|
| 1369 | sleepq_prof_reset(); |
---|
| 1370 | mtx_lock_spin(&sleepq_prof_lock); |
---|
| 1371 | prof_enabled = !!v; |
---|
| 1372 | mtx_unlock_spin(&sleepq_prof_lock); |
---|
| 1373 | |
---|
| 1374 | return (0); |
---|
| 1375 | } |
---|
| 1376 | |
---|
| 1377 | static int |
---|
| 1378 | reset_sleepq_prof_stats(SYSCTL_HANDLER_ARGS) |
---|
| 1379 | { |
---|
| 1380 | int error, v; |
---|
| 1381 | |
---|
| 1382 | v = 0; |
---|
| 1383 | error = sysctl_handle_int(oidp, &v, 0, req); |
---|
| 1384 | if (error) |
---|
| 1385 | return (error); |
---|
| 1386 | if (req->newptr == NULL) |
---|
| 1387 | return (error); |
---|
| 1388 | if (v == 0) |
---|
| 1389 | return (0); |
---|
| 1390 | sleepq_prof_reset(); |
---|
| 1391 | |
---|
| 1392 | return (0); |
---|
| 1393 | } |
---|
| 1394 | |
---|
| 1395 | static int |
---|
| 1396 | dump_sleepq_prof_stats(SYSCTL_HANDLER_ARGS) |
---|
| 1397 | { |
---|
| 1398 | struct sleepq_prof *sp; |
---|
| 1399 | struct sbuf *sb; |
---|
| 1400 | int enabled; |
---|
| 1401 | int error; |
---|
| 1402 | int i; |
---|
| 1403 | |
---|
| 1404 | error = sysctl_wire_old_buffer(req, 0); |
---|
| 1405 | if (error != 0) |
---|
| 1406 | return (error); |
---|
| 1407 | sb = sbuf_new_for_sysctl(NULL, NULL, SLEEPQ_SBUFSIZE, req); |
---|
| 1408 | sbuf_printf(sb, "\nwmesg\tcount\n"); |
---|
| 1409 | enabled = prof_enabled; |
---|
| 1410 | mtx_lock_spin(&sleepq_prof_lock); |
---|
| 1411 | prof_enabled = 0; |
---|
| 1412 | mtx_unlock_spin(&sleepq_prof_lock); |
---|
| 1413 | for (i = 0; i < SC_TABLESIZE; i++) { |
---|
| 1414 | LIST_FOREACH(sp, &sleepq_hash[i], sp_link) { |
---|
| 1415 | sbuf_printf(sb, "%s\t%ld\n", |
---|
| 1416 | sp->sp_wmesg, sp->sp_count); |
---|
| 1417 | } |
---|
| 1418 | } |
---|
| 1419 | mtx_lock_spin(&sleepq_prof_lock); |
---|
| 1420 | prof_enabled = enabled; |
---|
| 1421 | mtx_unlock_spin(&sleepq_prof_lock); |
---|
| 1422 | |
---|
| 1423 | error = sbuf_finish(sb); |
---|
| 1424 | sbuf_delete(sb); |
---|
| 1425 | return (error); |
---|
| 1426 | } |
---|
| 1427 | |
---|
| 1428 | SYSCTL_PROC(_debug_sleepq, OID_AUTO, stats, CTLTYPE_STRING | CTLFLAG_RD, |
---|
| 1429 | NULL, 0, dump_sleepq_prof_stats, "A", "Sleepqueue profiling statistics"); |
---|
| 1430 | SYSCTL_PROC(_debug_sleepq, OID_AUTO, reset, CTLTYPE_INT | CTLFLAG_RW, |
---|
| 1431 | NULL, 0, reset_sleepq_prof_stats, "I", |
---|
| 1432 | "Reset sleepqueue profiling statistics"); |
---|
| 1433 | SYSCTL_PROC(_debug_sleepq, OID_AUTO, enable, CTLTYPE_INT | CTLFLAG_RW, |
---|
| 1434 | NULL, 0, enable_sleepq_prof, "I", "Enable sleepqueue profiling"); |
---|
| 1435 | #endif |
---|
| 1436 | |
---|
| 1437 | #ifdef DDB |
---|
| 1438 | DB_SHOW_COMMAND(sleepq, db_show_sleepqueue) |
---|
| 1439 | { |
---|
| 1440 | struct sleepqueue_chain *sc; |
---|
| 1441 | struct sleepqueue *sq; |
---|
| 1442 | #ifdef INVARIANTS |
---|
| 1443 | struct lock_object *lock; |
---|
| 1444 | #endif |
---|
| 1445 | struct thread *td; |
---|
| 1446 | void *wchan; |
---|
| 1447 | int i; |
---|
| 1448 | |
---|
| 1449 | if (!have_addr) |
---|
| 1450 | return; |
---|
| 1451 | |
---|
| 1452 | /* |
---|
| 1453 | * First, see if there is an active sleep queue for the wait channel |
---|
| 1454 | * indicated by the address. |
---|
| 1455 | */ |
---|
| 1456 | wchan = (void *)addr; |
---|
| 1457 | sc = SC_LOOKUP(wchan); |
---|
| 1458 | LIST_FOREACH(sq, &sc->sc_queues, sq_hash) |
---|
| 1459 | if (sq->sq_wchan == wchan) |
---|
| 1460 | goto found; |
---|
| 1461 | |
---|
| 1462 | /* |
---|
| 1463 | * Second, see if there is an active sleep queue at the address |
---|
| 1464 | * indicated. |
---|
| 1465 | */ |
---|
| 1466 | for (i = 0; i < SC_TABLESIZE; i++) |
---|
| 1467 | LIST_FOREACH(sq, &sleepq_chains[i].sc_queues, sq_hash) { |
---|
| 1468 | if (sq == (struct sleepqueue *)addr) |
---|
| 1469 | goto found; |
---|
| 1470 | } |
---|
| 1471 | |
---|
| 1472 | db_printf("Unable to locate a sleep queue via %p\n", (void *)addr); |
---|
| 1473 | return; |
---|
| 1474 | found: |
---|
| 1475 | db_printf("Wait channel: %p\n", sq->sq_wchan); |
---|
| 1476 | db_printf("Queue type: %d\n", sq->sq_type); |
---|
| 1477 | #ifdef INVARIANTS |
---|
| 1478 | if (sq->sq_lock) { |
---|
| 1479 | lock = sq->sq_lock; |
---|
| 1480 | db_printf("Associated Interlock: %p - (%s) %s\n", lock, |
---|
| 1481 | LOCK_CLASS(lock)->lc_name, lock->lo_name); |
---|
| 1482 | } |
---|
| 1483 | #endif |
---|
| 1484 | db_printf("Blocked threads:\n"); |
---|
| 1485 | for (i = 0; i < NR_SLEEPQS; i++) { |
---|
| 1486 | db_printf("\nQueue[%d]:\n", i); |
---|
| 1487 | if (TAILQ_EMPTY(&sq->sq_blocked[i])) |
---|
| 1488 | db_printf("\tempty\n"); |
---|
| 1489 | else |
---|
| 1490 | TAILQ_FOREACH(td, &sq->sq_blocked[0], |
---|
| 1491 | td_slpq) { |
---|
| 1492 | db_printf("\t%p (tid %d, pid %d, \"%s\")\n", td, |
---|
| 1493 | td->td_tid, td->td_proc->p_pid, |
---|
| 1494 | td->td_name); |
---|
| 1495 | } |
---|
| 1496 | db_printf("(expected: %u)\n", sq->sq_blockedcnt[i]); |
---|
| 1497 | } |
---|
| 1498 | } |
---|
| 1499 | |
---|
| 1500 | /* Alias 'show sleepqueue' to 'show sleepq'. */ |
---|
| 1501 | DB_SHOW_ALIAS(sleepqueue, db_show_sleepqueue); |
---|
| 1502 | #endif |
---|