1 | /** |
---|
2 | * @file |
---|
3 | * |
---|
4 | * @ingroup rtems_bsd_rtems |
---|
5 | * |
---|
6 | * @brief TODO. |
---|
7 | */ |
---|
8 | |
---|
9 | /* |
---|
10 | * Copyright (c) 2014, 2016 embedded brains GmbH. All rights reserved. |
---|
11 | * |
---|
12 | * embedded brains GmbH |
---|
13 | * Dornierstr. 4 |
---|
14 | * 82178 Puchheim |
---|
15 | * Germany |
---|
16 | * <rtems@embedded-brains.de> |
---|
17 | * |
---|
18 | * Redistribution and use in source and binary forms, with or without |
---|
19 | * modification, are permitted provided that the following conditions |
---|
20 | * are met: |
---|
21 | * 1. Redistributions of source code must retain the above copyright |
---|
22 | * notice, this list of conditions and the following disclaimer. |
---|
23 | * 2. Redistributions in binary form must reproduce the above copyright |
---|
24 | * notice, this list of conditions and the following disclaimer in the |
---|
25 | * documentation and/or other materials provided with the distribution. |
---|
26 | * |
---|
27 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
---|
28 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
---|
29 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
---|
30 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
---|
31 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
---|
32 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
---|
33 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
---|
34 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
---|
35 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
---|
36 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
---|
37 | * SUCH DAMAGE. |
---|
38 | */ |
---|
39 | |
---|
40 | #include <machine/rtems-bsd-kernel-space.h> |
---|
41 | #include <machine/rtems-bsd-muteximpl.h> |
---|
42 | |
---|
43 | #include <rtems/score/schedulerimpl.h> |
---|
44 | #include <rtems/score/threadqimpl.h> |
---|
45 | |
---|
46 | #define BSD_MUTEX_TQ_OPERATIONS &_Thread_queue_Operations_priority_inherit |
---|
47 | |
---|
48 | void |
---|
49 | rtems_bsd_mutex_lock_more(struct lock_object *lock, rtems_bsd_mutex *m, |
---|
50 | Thread_Control *owner, Thread_Control *executing, |
---|
51 | Thread_queue_Context *queue_context) |
---|
52 | { |
---|
53 | if (owner == executing) { |
---|
54 | BSD_ASSERT(lock->lo_flags & LO_RECURSABLE); |
---|
55 | ++m->nest_level; |
---|
56 | |
---|
57 | _Thread_queue_Release(&m->queue, &queue_context->Lock_context); |
---|
58 | } else { |
---|
59 | ++executing->resource_count; |
---|
60 | _Thread_queue_Context_set_expected_level(queue_context, 1); |
---|
61 | _Thread_queue_Context_set_no_timeout(queue_context); |
---|
62 | _Thread_queue_Context_set_deadlock_callout(queue_context, |
---|
63 | _Thread_queue_Deadlock_fatal); |
---|
64 | _Thread_queue_Enqueue_critical(&m->queue.Queue, |
---|
65 | BSD_MUTEX_TQ_OPERATIONS, executing, |
---|
66 | STATES_WAITING_FOR_SYS_LOCK_MUTEX, queue_context); |
---|
67 | } |
---|
68 | } |
---|
69 | |
---|
70 | void |
---|
71 | rtems_bsd_mutex_unlock_more(rtems_bsd_mutex *m, Thread_Control *owner, |
---|
72 | int keep_priority, Thread_queue_Heads *heads, |
---|
73 | Thread_queue_Context *queue_context) |
---|
74 | { |
---|
75 | if (heads != NULL) { |
---|
76 | const Thread_queue_Operations *operations; |
---|
77 | Thread_Control *new_owner; |
---|
78 | |
---|
79 | operations = BSD_MUTEX_TQ_OPERATIONS; |
---|
80 | new_owner = ( *operations->first )( heads ); |
---|
81 | m->queue.Queue.owner = new_owner; |
---|
82 | _Thread_queue_Extract_critical(&m->queue.Queue, operations, |
---|
83 | new_owner, queue_context); |
---|
84 | } else { |
---|
85 | _Thread_queue_Release(&m->queue, &queue_context->Lock_context); |
---|
86 | } |
---|
87 | |
---|
88 | if (!keep_priority) { |
---|
89 | Per_CPU_Control *cpu_self; |
---|
90 | |
---|
91 | cpu_self = _Thread_Dispatch_disable(); |
---|
92 | _Thread_Restore_priority(owner); |
---|
93 | _Thread_Dispatch_enable(cpu_self); |
---|
94 | } |
---|
95 | } |
---|