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source: rtems-libbsd/freebsd/sys/sys/proc.h @ fa69a12

55-freebsd-126-freebsd-12freebsd-9.3

Last change on this file since fa69a12 was fa69a12, checked in by Sebastian Huber <sebastian.huber@…>, on 10/30/15 at 07:00:59
Dummy PHOLD() and PRELE()
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File size: 42.0 KB

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1	/*-
2	* Copyright (c) 1986, 1989, 1991, 1993
3	* The Regents of the University of California. All rights reserved.
4	* (c) UNIX System Laboratories, Inc.
5	* All or some portions of this file are derived from material licensed
6	* to the University of California by American Telephone and Telegraph
7	* Co. or Unix System Laboratories, Inc. and are reproduced herein with
8	* the permission of UNIX System Laboratories, Inc.
9	*
10	* Redistribution and use in source and binary forms, with or without
11	* modification, are permitted provided that the following conditions
12	* are met:
13	* 1. Redistributions of source code must retain the above copyright
14	* notice, this list of conditions and the following disclaimer.
15	* 2. Redistributions in binary form must reproduce the above copyright
16	* notice, this list of conditions and the following disclaimer in the
17	* documentation and/or other materials provided with the distribution.
18	* 4. Neither the name of the University nor the names of its contributors
19	* may be used to endorse or promote products derived from this software
20	* without specific prior written permission.
21	*
22	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32	* SUCH DAMAGE.
33	*
34	* @(#)proc.h 8.15 (Berkeley) 5/19/95
35	* $FreeBSD$
36	*/
37
38	#ifndef _SYS_PROC_H_
39	#define _SYS_PROC_H_
40
41	#include <sys/callout.h> /* For struct callout. */
42	#include <sys/event.h> /* For struct klist. */
43	#include <sys/condvar.h>
44	#ifndef _KERNEL
45	#include <sys/filedesc.h>
46	#endif
47	#include <sys/queue.h>
48	#include <sys/_lock.h>
49	#include <sys/lock_profile.h>
50	#include <sys/_mutex.h>
51	#include <sys/osd.h>
52	#include <sys/priority.h>
53	#include <sys/rtprio.h> /* XXX. */
54	#include <sys/runq.h>
55	#include <rtems/bsd/sys/resource.h>
56	#include <sys/sigio.h>
57	#include <sys/signal.h>
58	#include <sys/signalvar.h>
59	#ifndef _KERNEL
60	#include <rtems/bsd/sys/time.h> /* For structs itimerval, timeval. */
61	#else
62	#include <sys/pcpu.h>
63	#endif
64	#include <sys/ucontext.h>
65	#include <sys/ucred.h>
66	#include <machine/proc.h> /* Machine-dependent proc substruct. */
67
68	/*
69	* One structure allocated per session.
70	*
71	* List of locks
72	* (m) locked by s_mtx mtx
73	* (e) locked by proctree_lock sx
74	* (c) const until freeing
75	*/
76	struct session {
77	u_int s_count; /* Ref cnt; pgrps in session - atomic. */
78	struct proc s_leader; / (m + e) Session leader. */
79	struct vnode s_ttyvp; / (m) Vnode of controlling tty. */
80	struct cdev_priv s_ttydp; / (m) Device of controlling tty. */
81	struct tty s_ttyp; / (e) Controlling tty. */
82	pid_t s_sid; /* (c) Session ID. */
83	/* (m) Setlogin() name: */
84	char s_login[roundup(MAXLOGNAME, sizeof(long))];
85	struct mtx s_mtx; /* Mutex to protect members. */
86	};
87
88	/*
89	* One structure allocated per process group.
90	*
91	* List of locks
92	* (m) locked by pg_mtx mtx
93	* (e) locked by proctree_lock sx
94	* (c) const until freeing
95	*/
96	struct pgrp {
97	LIST_ENTRY(pgrp) pg_hash; /* (e) Hash chain. */
98	LIST_HEAD(, proc) pg_members; /* (m + e) Pointer to pgrp members. */
99	struct session pg_session; / (c) Pointer to session. */
100	struct sigiolst pg_sigiolst; /* (m) List of sigio sources. */
101	pid_t pg_id; /* (c) Process group id. */
102	int pg_jobc; /* (m) Job control process count. */
103	struct mtx pg_mtx; /* Mutex to protect members */
104	};
105
106	/*
107	* pargs, used to hold a copy of the command line, if it had a sane length.
108	*/
109	struct pargs {
110	u_int ar_ref; /* Reference count. */
111	u_int ar_length; /* Length. */
112	u_char ar_args[1]; /* Arguments. */
113	};
114
115	/*-
116	* Description of a process.
117	*
118	* This structure contains the information needed to manage a thread of
119	* control, known in UN*X as a process; it has references to substructures
120	* containing descriptions of things that the process uses, but may share
121	* with related processes. The process structure and the substructures
122	* are always addressable except for those marked "(CPU)" below,
123	* which might be addressable only on a processor on which the process
124	* is running.
125	*
126	* Below is a key of locks used to protect each member of struct proc. The
127	* lock is indicated by a reference to a specific character in parens in the
128	* associated comment.
129	* * - not yet protected
130	* a - only touched by curproc or parent during fork/wait
131	* b - created at fork, never changes
132	* (exception aiods switch vmspaces, but they are also
133	* marked 'P_SYSTEM' so hopefully it will be left alone)
134	* c - locked by proc mtx
135	* d - locked by allproc_lock lock
136	* e - locked by proctree_lock lock
137	* f - session mtx
138	* g - process group mtx
139	* h - callout_lock mtx
140	* i - by curproc or the master session mtx
141	* j - locked by proc slock
142	* k - only accessed by curthread
143	* k*- only accessed by curthread and from an interrupt
144	* l - the attaching proc or attaching proc parent
145	* m - Giant
146	* n - not locked, lazy
147	* o - ktrace lock
148	* q - td_contested lock
149	* r - p_peers lock
150	* t - thread lock
151	* x - created at fork, only changes during single threading in exec
152	* y - created at first aio, doesn't change until exit or exec at which
153	* point we are single-threaded and only curthread changes it
154	* z - zombie threads lock
155	*
156	* If the locking key specifies two identifiers (for example, p_pptr) then
157	* either lock is sufficient for read access, but both locks must be held
158	* for write access.
159	*/
160	struct cpuset;
161	struct kaioinfo;
162	struct kaudit_record;
163	struct kdtrace_proc;
164	struct kdtrace_thread;
165	struct mqueue_notifier;
166	struct nlminfo;
167	struct p_sched;
168	struct proc;
169	struct procdesc;
170	struct racct;
171	struct sbuf;
172	struct sleepqueue;
173	struct td_sched;
174	struct thread;
175	struct trapframe;
176	struct turnstile;
177
178	/*
179	* XXX: Does this belong in resource.h or resourcevar.h instead?
180	* Resource usage extension. The times in rusage structs in the kernel are
181	* never up to date. The actual times are kept as runtimes and tick counts
182	* (with control info in the "previous" times), and are converted when
183	* userland asks for rusage info. Backwards compatibility prevents putting
184	* this directly in the user-visible rusage struct.
185	*
186	* Locking for p_rux: (cj) means (j) for p_rux and (c) for p_crux.
187	* Locking for td_rux: (t) for all fields.
188	*/
189	struct rusage_ext {
190	uint64_t rux_runtime; /* (cj) Real time. */
191	uint64_t rux_uticks; /* (cj) Statclock hits in user mode. */
192	uint64_t rux_sticks; /* (cj) Statclock hits in sys mode. */
193	uint64_t rux_iticks; /* (cj) Statclock hits in intr mode. */
194	uint64_t rux_uu; /* (c) Previous user time in usec. */
195	uint64_t rux_su; /* (c) Previous sys time in usec. */
196	uint64_t rux_tu; /* (c) Previous total time in usec. */
197	};
198	#ifdef __rtems__
199	enum thread_sq_states {
200	TD_SQ_WAKEUP,
201	TD_SQ_PANIC = EWOULDBLOCK,
202	TD_SQ_TIRED,
203	TD_SQ_SLEEPY,
204	TD_SQ_SLEEPING,
205	TD_SQ_NIGHTMARE
206	};
207	#endif /* __rtems__ */
208
209	/*
210	* Kernel runnable context (thread).
211	* This is what is put to sleep and reactivated.
212	* Thread context. Processes may have multiple threads.
213	*/
214	struct thread {
215	#ifdef __rtems__
216	Thread_Control *td_thread;
217	struct rtems_bsd_program_control *td_prog_ctrl;
218	char td_name[32];
219	#endif /* __rtems__ */
220	#ifndef __rtems__
221	struct mtx volatile td_lock; / replaces sched lock */
222	struct proc td_proc; / () Associated process. /
223	TAILQ_ENTRY(thread) td_plist; /* () All threads in this proc. /
224	TAILQ_ENTRY(thread) td_runq; /* (t) Run queue. */
225	#endif /* __rtems__ */
226	TAILQ_ENTRY(thread) td_slpq; /* (t) Sleep queue. */
227	#ifndef __rtems__
228	TAILQ_ENTRY(thread) td_lockq; /* (t) Lock queue. */
229	LIST_ENTRY(thread) td_hash; /* (d) Hash chain. */
230	struct cpuset td_cpuset; / (t) CPU affinity mask. */
231	#endif /* __rtems__ */
232	struct seltd td_sel; / Select queue/channel. */
233	struct sleepqueue td_sleepqueue; / (k) Associated sleep queue. */
234	#ifndef __rtems__
235	struct turnstile td_turnstile; / (k) Associated turnstile. */
236	struct umtx_q td_umtxq; / (c?) Link for when we're blocked. */
237	lwpid_t td_tid; /* (b) Thread ID. */
238	sigqueue_t td_sigqueue; /* (c) Sigs arrived, not delivered. */
239	#define td_siglist td_sigqueue.sq_signals
240	u_char td_lend_user_pri; /* (t) Lend user pri. */
241
242	/* Cleared during fork1() */
243	#define td_startzero td_flags
244	int td_flags; /* (t) TDF_* flags. */
245	int td_inhibitors; /* (t) Why can not run. */
246	int td_pflags; /* (k) Private thread (TDP_) flags. /
247	int td_dupfd; /* (k) Ret value from fdopen. XXX */
248	#endif /* __rtems__ */
249	#ifdef __rtems__
250	enum thread_sq_states td_sq_state;
251	#endif /* __rtems__ */
252	int td_sqqueue; /* (t) Sleepqueue queue blocked on. */
253	void td_wchan; / (t) Sleep address. */
254	const char td_wmesg; / (t) Reason for sleep. */
255	#ifndef __rtems__
256	u_char td_lastcpu; /* (t) Last cpu we were on. */
257	u_char td_oncpu; /* (t) Which cpu we are on. */
258	volatile u_char td_owepreempt; /* (k) Preempt on last critical_exit /
259	u_char td_tsqueue; /* (t) Turnstile queue blocked on. */
260	short td_locks; /* (k) Count of non-spin locks. */
261	short td_rw_rlocks; /* (k) Count of rwlock read locks. */
262	short td_lk_slocks; /* (k) Count of lockmgr shared locks. */
263	short td_stopsched; /* (k) Scheduler stopped. */
264	struct turnstile td_blocked; / (t) Lock thread is blocked on. */
265	const char td_lockname; / (t) Name of lock blocked on. */
266	LIST_HEAD(, turnstile) td_contested; /* (q) Contested locks. */
267	struct lock_list_entry td_sleeplocks; / (k) Held sleep locks. */
268	int td_intr_nesting_level; /* (k) Interrupt recursion. */
269	int td_pinned; /* (k) Temporary cpu pin count. */
270	#endif /* __rtems__ */
271	struct ucred td_ucred; / (k) Reference to credentials. */
272	#ifndef __rtems__
273	u_int td_estcpu; /* (t) estimated cpu utilization */
274	int td_slptick; /* (t) Time at sleep. */
275	int td_blktick; /* (t) Time spent blocked. */
276	int td_swvoltick; /* (t) Time at last SW_VOL switch. */
277	u_int td_cow; /* () Number of copy-on-write faults /
278	struct rusage td_ru; /* (t) rusage information. */
279	struct rusage_ext td_rux; /* (t) Internal rusage information. */
280	uint64_t td_incruntime; /* (t) Cpu ticks to transfer to proc. */
281	uint64_t td_runtime; /* (t) How many cpu ticks we've run. */
282	u_int td_pticks; /* (t) Statclock hits for profiling */
283	u_int td_sticks; /* (t) Statclock hits in system mode. */
284	u_int td_iticks; /* (t) Statclock hits in intr mode. */
285	u_int td_uticks; /* (t) Statclock hits in user mode. */
286	int td_intrval; /* (t) Return value for sleepq. */
287	sigset_t td_oldsigmask; /* (k) Saved mask from pre sigpause. */
288	sigset_t td_sigmask; /* (c) Current signal mask. */
289	volatile u_int td_generation; /* (k) For detection of preemption */
290	stack_t td_sigstk; /* (k) Stack ptr and on-stack flag. */
291	int td_xsig; /* (c) Signal for ptrace */
292	u_long td_profil_addr; /* (k) Temporary addr until AST. */
293	u_int td_profil_ticks; /* (k) Temporary ticks until AST. */
294	char td_name[MAXCOMLEN + 1]; /* () Thread name. /
295	struct file td_fpop; / (k) file referencing cdev under op */
296	int td_dbgflags; /* (c) Userland debugger flags */
297	struct ksiginfo td_dbgksi; /* (c) ksi reflected to debugger. */
298	int td_ng_outbound; /* (k) Thread entered ng from above. */
299	struct osd td_osd; /* (k) Object specific data. */
300	struct vm_map_entry td_map_def_user; / (k) Deferred entries. */
301	pid_t td_dbg_forked; /* (c) Child pid for debugger. */
302	#define td_endzero td_rqindex
303
304	/* Copied during fork1() or thread_sched_upcall(). */
305	#define td_startcopy td_endzero
306	u_char td_rqindex; /* (t) Run queue index. */
307	u_char td_base_pri; /* (t) Thread base kernel priority. */
308	u_char td_priority; /* (t) Thread active priority. */
309	u_char td_pri_class; /* (t) Scheduling class. */
310	u_char td_user_pri; /* (t) User pri from estcpu and nice. */
311	u_char td_base_user_pri; /* (t) Base user pri */
312	#define td_endcopy td_pcb
313
314	/*
315	* Fields that must be manually set in fork1() or thread_sched_upcall()
316	* or already have been set in the allocator, constructor, etc.
317	*/
318	struct pcb td_pcb; / (k) Kernel VA of pcb and kstack. */
319	enum {
320	TDS_INACTIVE = 0x0,
321	TDS_INHIBITED,
322	TDS_CAN_RUN,
323	TDS_RUNQ,
324	TDS_RUNNING
325	} td_state; /* (t) thread state */
326	#endif /* __rtems__ */
327	register_t td_retval[2]; /* (k) Syscall aux returns. */
328	#ifndef __rtems__
329	struct callout td_slpcallout; /* (h) Callout for sleep. */
330	struct trapframe td_frame; / (k) */
331	struct vm_object td_kstack_obj;/ (a) Kstack object. */
332	vm_offset_t td_kstack; /* (a) Kernel VA of kstack. */
333	int td_kstack_pages; /* (a) Size of the kstack. */
334	volatile u_int td_critnest; /* (k) Critical section nest level. /
335	struct mdthread td_md; /* (k) Any machine-dependent fields. */
336	struct td_sched td_sched; / () Scheduler-specific data. /
337	struct kaudit_record td_ar; / (k) Active audit record, if any. */
338	struct lpohead td_lprof[2]; /* (a) lock profiling objects. */
339	struct kdtrace_thread td_dtrace; / () DTrace-specific data. /
340	int td_errno; /* Error returned by last syscall. */
341	struct vnet td_vnet; / (k) Effective vnet. */
342	const char td_vnet_lpush; / (k) Debugging vnet push / pop. */
343	struct trapframe td_intr_frame;/ (k) Frame of the current irq */
344	struct proc td_rfppwait_p; / (k) The vforked child */
345	struct vm_page *td_ma; / (k) uio pages held */
346	int td_ma_cnt; /* (k) size of td_ma /
347	struct rl_q_entry td_rlqe; / (k) Associated range lock entry. */
348	u_int td_vp_reserv; /* (k) Count of reserved vnodes. */
349	#endif /* __rtems__ */
350	};
351
352	struct mtx thread_lock_block(struct thread );
353	void thread_lock_unblock(struct thread , struct mtx );
354	void thread_lock_set(struct thread , struct mtx );
355	#ifndef __rtems__
356	#define THREAD_LOCK_ASSERT(td, type) \
357	do { \
358	struct mtx *__m = (td)->td_lock; \
359	if (__m != &blocked_lock) \
360	mtx_assert(__m, (type)); \
361	} while (0)
362	#else /* __rtems__ */
363	#define THREAD_LOCK_ASSERT(td, type)
364	#endif /* __rtems__ */
365
366	#ifdef INVARIANTS
367	#define THREAD_LOCKPTR_ASSERT(td, lock) \
368	do { \
369	struct mtx *__m = (td)->td_lock; \
370	KASSERT((__m == &blocked_lock \|\| __m == (lock)), \
371	("Thread %p lock %p does not match %p", td, __m, (lock))); \
372	} while (0)
373	#else
374	#define THREAD_LOCKPTR_ASSERT(td, lock)
375	#endif
376
377	#define CRITICAL_ASSERT(td) \
378	KASSERT((td)->td_critnest >= 1, ("Not in critical section"));
379
380	/*
381	* Flags kept in td_flags:
382	* To change these you MUST have the scheduler lock.
383	*/
384	#define TDF_BORROWING 0x00000001 /* Thread is borrowing pri from another. */
385	#define TDF_INPANIC 0x00000002 /* Caused a panic, let it drive crashdump. */
386	#define TDF_INMEM 0x00000004 /* Thread's stack is in memory. */
387	#define TDF_SINTR 0x00000008 /* Sleep is interruptible. */
388	#define TDF_TIMEOUT 0x00000010 /* Timing out during sleep. */
389	#define TDF_IDLETD 0x00000020 /* This is a per-CPU idle thread. */
390	#define TDF_CANSWAP 0x00000040 /* Thread can be swapped. */
391	#define TDF_SLEEPABORT 0x00000080 /* sleepq_abort was called. */
392	#define TDF_KTH_SUSP 0x00000100 /* kthread is suspended */
393	#define TDF_UNUSED09 0x00000200 /* --available-- */
394	#define TDF_BOUNDARY 0x00000400 /* Thread suspended at user boundary */
395	#define TDF_ASTPENDING 0x00000800 /* Thread has some asynchronous events. */
396	#define TDF_TIMOFAIL 0x00001000 /* Timeout from sleep after we were awake. */
397	#define TDF_SBDRY 0x00002000 /* Stop only on usermode boundary. */
398	#define TDF_UPIBLOCKED 0x00004000 /* Thread blocked on user PI mutex. */
399	#define TDF_NEEDSUSPCHK 0x00008000 /* Thread may need to suspend. */
400	#define TDF_NEEDRESCHED 0x00010000 /* Thread needs to yield. */
401	#define TDF_NEEDSIGCHK 0x00020000 /* Thread may need signal delivery. */
402	#define TDF_NOLOAD 0x00040000 /* Ignore during load avg calculations. */
403	#define TDF_UNUSED19 0x00080000 /* --available-- */
404	#define TDF_THRWAKEUP 0x00100000 /* Libthr thread must not suspend itself. */
405	#define TDF_UNUSED21 0x00200000 /* --available-- */
406	#define TDF_SWAPINREQ 0x00400000 /* Swapin request due to wakeup. */
407	#define TDF_UNUSED23 0x00800000 /* --available-- */
408	#define TDF_SCHED0 0x01000000 /* Reserved for scheduler private use */
409	#define TDF_SCHED1 0x02000000 /* Reserved for scheduler private use */
410	#define TDF_SCHED2 0x04000000 /* Reserved for scheduler private use */
411	#define TDF_SCHED3 0x08000000 /* Reserved for scheduler private use */
412	#define TDF_ALRMPEND 0x10000000 /* Pending SIGVTALRM needs to be posted. */
413	#define TDF_PROFPEND 0x20000000 /* Pending SIGPROF needs to be posted. */
414	#define TDF_MACPEND 0x40000000 /* AST-based MAC event pending. */
415
416	/* Userland debug flags */
417	#define TDB_SUSPEND 0x00000001 /* Thread is suspended by debugger */
418	#define TDB_XSIG 0x00000002 /* Thread is exchanging signal under trace */
419	#define TDB_USERWR 0x00000004 /* Debugger modified memory or registers */
420	#define TDB_SCE 0x00000008 /* Thread performs syscall enter */
421	#define TDB_SCX 0x00000010 /* Thread performs syscall exit */
422	#define TDB_EXEC 0x00000020 /* TDB_SCX from exec(2) family */
423	#define TDB_FORK 0x00000040 /* TDB_SCX from fork(2) that created new
424	process */
425	#define TDB_STOPATFORK 0x00000080 /* Stop at the return from fork (child
426	only) */
427	#define TDB_CHILD 0x00000100 /* New child indicator for ptrace() */
428
429	/*
430	* "Private" flags kept in td_pflags:
431	* These are only written by curthread and thus need no locking.
432	*/
433	#define TDP_OLDMASK 0x00000001 /* Need to restore mask after suspend. */
434	#define TDP_INKTR 0x00000002 /* Thread is currently in KTR code. */
435	#define TDP_INKTRACE 0x00000004 /* Thread is currently in KTRACE code. */
436	#define TDP_BUFNEED 0x00000008 /* Do not recurse into the buf flush */
437	#define TDP_COWINPROGRESS 0x00000010 /* Snapshot copy-on-write in progress. */
438	#define TDP_ALTSTACK 0x00000020 /* Have alternate signal stack. */
439	#define TDP_DEADLKTREAT 0x00000040 /* Lock aquisition - deadlock treatment. */
440	#define TDP_NOFAULTING 0x00000080 /* Do not handle page faults. */
441	#define TDP_NOSLEEPING 0x00000100 /* Thread is not allowed to sleep on a sq. */
442	#define TDP_OWEUPC 0x00000200 /* Call addupc() at next AST. */
443	#define TDP_ITHREAD 0x00000400 /* Thread is an interrupt thread. */
444	#define TDP_SYNCIO 0x00000800 /* Local override, disable async i/o. */
445	#define TDP_SCHED1 0x00001000 /* Reserved for scheduler private use */
446	#define TDP_SCHED2 0x00002000 /* Reserved for scheduler private use */
447	#define TDP_SCHED3 0x00004000 /* Reserved for scheduler private use */
448	#define TDP_SCHED4 0x00008000 /* Reserved for scheduler private use */
449	#define TDP_GEOM 0x00010000 /* Settle GEOM before finishing syscall */
450	#define TDP_SOFTDEP 0x00020000 /* Stuck processing softdep worklist */
451	#define TDP_NORUNNINGBUF 0x00040000 /* Ignore runningbufspace check */
452	#define TDP_WAKEUP 0x00080000 /* Don't sleep in umtx cond_wait */
453	#define TDP_INBDFLUSH 0x00100000 /* Already in BO_BDFLUSH, do not recurse */
454	#define TDP_KTHREAD 0x00200000 /* This is an official kernel thread */
455	#define TDP_CALLCHAIN 0x00400000 /* Capture thread's callchain */
456	#define TDP_IGNSUSP 0x00800000 /* Permission to ignore the MNTK_SUSPEND* */
457	#define TDP_AUDITREC 0x01000000 /* Audit record pending on thread */
458	#define TDP_RFPPWAIT 0x02000000 /* Handle RFPPWAIT on syscall exit */
459	#define TDP_RESETSPUR 0x04000000 /* Reset spurious page fault history. */
460	#define TDP_NERRNO 0x08000000 /* Last errno is already in td_errno */
461	#define TDP_UIOHELD 0x10000000 /* Current uio has pages held in td_ma */
462	#define TDP_DEVMEMIO 0x20000000 /* Accessing memory for /dev/mem */
463	#define TDP_EXECVMSPC 0x40000000 /* Execve destroyed old vmspace */
464
465	/*
466	* Reasons that the current thread can not be run yet.
467	* More than one may apply.
468	*/
469	#define TDI_SUSPENDED 0x0001 /* On suspension queue. */
470	#define TDI_SLEEPING 0x0002 /* Actually asleep! (tricky). */
471	#define TDI_SWAPPED 0x0004 /* Stack not in mem. Bad juju if run. */
472	#define TDI_LOCK 0x0008 /* Stopped on a lock. */
473	#define TDI_IWAIT 0x0010 /* Awaiting interrupt. */
474
475	#define TD_IS_SLEEPING(td) ((td)->td_inhibitors & TDI_SLEEPING)
476	#define TD_ON_SLEEPQ(td) ((td)->td_wchan != NULL)
477	#define TD_IS_SUSPENDED(td) ((td)->td_inhibitors & TDI_SUSPENDED)
478	#define TD_IS_SWAPPED(td) ((td)->td_inhibitors & TDI_SWAPPED)
479	#define TD_ON_LOCK(td) ((td)->td_inhibitors & TDI_LOCK)
480	#define TD_AWAITING_INTR(td) ((td)->td_inhibitors & TDI_IWAIT)
481	#ifndef __rtems__
482	#define TD_IS_RUNNING(td) ((td)->td_state == TDS_RUNNING)
483	#else /* __rtems__ */
484	#define TD_IS_RUNNING(td) (1)
485	#endif /* __rtems__ */
486	#define TD_ON_RUNQ(td) ((td)->td_state == TDS_RUNQ)
487	#define TD_CAN_RUN(td) ((td)->td_state == TDS_CAN_RUN)
488	#define TD_IS_INHIBITED(td) ((td)->td_state == TDS_INHIBITED)
489	#define TD_ON_UPILOCK(td) ((td)->td_flags & TDF_UPIBLOCKED)
490	#define TD_IS_IDLETHREAD(td) ((td)->td_flags & TDF_IDLETD)
491
492
493	#define TD_SET_INHIB(td, inhib) do { \
494	(td)->td_state = TDS_INHIBITED; \
495	(td)->td_inhibitors \|= (inhib); \
496	} while (0)
497
498	#define TD_CLR_INHIB(td, inhib) do { \
499	if (((td)->td_inhibitors & (inhib)) && \
500	(((td)->td_inhibitors &= ~(inhib)) == 0)) \
501	(td)->td_state = TDS_CAN_RUN; \
502	} while (0)
503
504	#define TD_SET_SLEEPING(td) TD_SET_INHIB((td), TDI_SLEEPING)
505	#define TD_SET_SWAPPED(td) TD_SET_INHIB((td), TDI_SWAPPED)
506	#define TD_SET_LOCK(td) TD_SET_INHIB((td), TDI_LOCK)
507	#define TD_SET_SUSPENDED(td) TD_SET_INHIB((td), TDI_SUSPENDED)
508	#define TD_SET_IWAIT(td) TD_SET_INHIB((td), TDI_IWAIT)
509	#define TD_SET_EXITING(td) TD_SET_INHIB((td), TDI_EXITING)
510
511	#define TD_CLR_SLEEPING(td) TD_CLR_INHIB((td), TDI_SLEEPING)
512	#define TD_CLR_SWAPPED(td) TD_CLR_INHIB((td), TDI_SWAPPED)
513	#define TD_CLR_LOCK(td) TD_CLR_INHIB((td), TDI_LOCK)
514	#define TD_CLR_SUSPENDED(td) TD_CLR_INHIB((td), TDI_SUSPENDED)
515	#define TD_CLR_IWAIT(td) TD_CLR_INHIB((td), TDI_IWAIT)
516
517	#define TD_SET_RUNNING(td) (td)->td_state = TDS_RUNNING
518	#define TD_SET_RUNQ(td) (td)->td_state = TDS_RUNQ
519	#define TD_SET_CAN_RUN(td) (td)->td_state = TDS_CAN_RUN
520
521	/*
522	* Process structure.
523	*/
524	struct proc {
525	#ifndef __rtems__
526	LIST_ENTRY(proc) p_list; /* (d) List of all processes. */
527	TAILQ_HEAD(, thread) p_threads; /* (c) all threads. */
528	struct mtx p_slock; /* process spin lock */
529	struct ucred p_ucred; / (c) Process owner's identity. */
530	struct filedesc p_fd; / (b) Open files. */
531	struct filedesc_to_leader p_fdtol; / (b) Tracking node */
532	struct pstats p_stats; / (b) Accounting/statistics (CPU). */
533	struct plimit p_limit; / (c) Process limits. */
534	struct callout p_limco; /* (c) Limit callout handle */
535	struct sigacts p_sigacts; / (x) Signal actions, state (CPU). */
536
537	int p_flag; /* (c) P_* flags. */
538	int p_flag2; /* (c) P2_* flags. */
539	enum {
540	PRS_NEW = 0, /* In creation */
541	PRS_NORMAL, /* threads can be run. */
542	PRS_ZOMBIE
543	} p_state; /* (j/c) Process status. */
544	pid_t p_pid; /* (b) Process identifier. */
545	LIST_ENTRY(proc) p_hash; /* (d) Hash chain. */
546	LIST_ENTRY(proc) p_pglist; /* (g + e) List of processes in pgrp. */
547	struct proc p_pptr; / (c + e) Pointer to parent process. */
548	LIST_ENTRY(proc) p_sibling; /* (e) List of sibling processes. */
549	LIST_HEAD(, proc) p_children; /* (e) Pointer to list of children. */
550	struct mtx p_mtx; /* (n) Lock for this struct. */
551	struct ksiginfo p_ksi; / Locked by parent proc lock */
552	sigqueue_t p_sigqueue; /* (c) Sigs not delivered to a td. */
553	#define p_siglist p_sigqueue.sq_signals
554
555	/* The following fields are all zeroed upon creation in fork. */
556	#define p_startzero p_oppid
557	pid_t p_oppid; /* (c + e) Save ppid in ptrace. XXX */
558	int p_pad_dbg_child;
559	struct vmspace p_vmspace; / (b) Address space. */
560	u_int p_swtick; /* (c) Tick when swapped in or out. */
561	struct itimerval p_realtimer; /* (c) Alarm timer. */
562	struct rusage p_ru; /* (a) Exit information. */
563	struct rusage_ext p_rux; /* (cj) Internal resource usage. */
564	struct rusage_ext p_crux; /* (c) Internal child resource usage. */
565	int p_profthreads; /* (c) Num threads in addupc_task. */
566	volatile int p_exitthreads; /* (j) Number of threads exiting */
567	int p_traceflag; /* (o) Kernel trace points. */
568	struct vnode p_tracevp; / (c + o) Trace to vnode. */
569	struct ucred p_tracecred; / (o) Credentials to trace with. */
570	struct vnode p_textvp; / (b) Vnode of executable. */
571	u_int p_lock; /* (c) Proclock (prevent swap) count. */
572	struct sigiolst p_sigiolst; /* (c) List of sigio sources. */
573	int p_sigparent; /* (c) Signal to parent on exit. */
574	int p_sig; /* (n) For core dump/debugger XXX. */
575	u_long p_code; /* (n) For core dump/debugger XXX. */
576	u_int p_stops; /* (c) Stop event bitmask. */
577	u_int p_stype; /* (c) Stop event type. */
578	char p_step; /* (c) Process is stopped. */
579	u_char p_pfsflags; /* (c) Procfs flags. */
580	struct nlminfo p_nlminfo; / (?) Only used by/for lockd. */
581	struct kaioinfo p_aioinfo; / (y) ASYNC I/O info. */
582	struct thread p_singlethread;/ (c + j) If single threading this is it */
583	int p_suspcount; /* (j) Num threads in suspended mode. */
584	struct thread p_xthread; / (c) Trap thread */
585	int p_boundary_count;/* (j) Num threads at user boundary */
586	int p_pendingcnt; /* how many signals are pending */
587	struct itimers p_itimers; / (c) POSIX interval timers. */
588	struct procdesc p_procdesc; / (e) Process descriptor, if any. */
589	/* End area that is zeroed on creation. */
590	#define p_endzero p_magic
591
592	/* The following fields are all copied upon creation in fork. */
593	#define p_startcopy p_endzero
594	u_int p_magic; /* (b) Magic number. */
595	int p_osrel; /* (x) osreldate for the
596	binary (from ELF note, if any) */
597	char p_comm[MAXCOMLEN + 1]; /* (b) Process name. */
598	struct pgrp p_pgrp; / (c + e) Pointer to process group. */
599	struct sysentvec p_sysent; / (b) Syscall dispatch info. */
600	struct pargs p_args; / (c) Process arguments. */
601	rlim_t p_cpulimit; /* (c) Current CPU limit in seconds. */
602	signed char p_nice; /* (c) Process "nice" value. */
603	int p_fibnum; /* in this routing domain XXX MRT */
604	/* End area that is copied on creation. */
605	#define p_endcopy p_xstat
606
607	u_short p_xstat; /* (c) Exit status; also stop sig. */
608	struct knlist p_klist; /* (c) Knotes attached to this proc. */
609	int p_numthreads; /* (c) Number of threads. */
610	struct mdproc p_md; /* Any machine-dependent fields. */
611	struct callout p_itcallout; /* (h + c) Interval timer callout. */
612	u_short p_acflag; /* (c) Accounting flags. */
613	struct proc p_peers; / (r) */
614	struct proc p_leader; / (b) */
615	void p_emuldata; / (c) Emulator state data. */
616	struct label p_label; / () Proc (not subject) MAC label. /
617	struct p_sched p_sched; / () Scheduler-specific data. /
618	STAILQ_HEAD(, ktr_request) p_ktr; /* (o) KTR event queue. */
619	LIST_HEAD(, mqueue_notifier) p_mqnotifier; /* (c) mqueue notifiers.*/
620	struct kdtrace_proc p_dtrace; / () DTrace-specific data. /
621	struct cv p_pwait; /* () wait cv for exit/exec. /
622	struct cv p_dbgwait; /* (*) wait cv for debugger attach
623	after fork. */
624	uint64_t p_prev_runtime; /* (c) Resource usage accounting. */
625	struct racct p_racct; / (b) Resource accounting. */
626	/*
627	* An orphan is the child that has beed re-parented to the
628	* debugger as a result of attaching to it. Need to keep
629	* track of them for parent to be able to collect the exit
630	* status of what used to be children.
631	*/
632	LIST_ENTRY(proc) p_orphan; /* (e) List of orphan processes. */
633	LIST_HEAD(, proc) p_orphans; /* (e) Pointer to list of orphans. */
634	u_char p_throttled; /* (c) Flag for racct pcpu throttling */
635	#endif /* __rtems__ */
636	};
637
638	#define p_session p_pgrp->pg_session
639	#define p_pgid p_pgrp->pg_id
640
641	#define NOCPU 0xff /* For when we aren't on a CPU. */
642
643	#define PROC_SLOCK(p) mtx_lock_spin(&(p)->p_slock)
644	#define PROC_SUNLOCK(p) mtx_unlock_spin(&(p)->p_slock)
645	#define PROC_SLOCK_ASSERT(p, type) mtx_assert(&(p)->p_slock, (type))
646
647	/* These flags are kept in p_flag. */
648	#define P_ADVLOCK 0x00001 /* Process may hold a POSIX advisory lock. */
649	#define P_CONTROLT 0x00002 /* Has a controlling terminal. */
650	#define P_KTHREAD 0x00004 /* Kernel thread (). /
651	#define P_FOLLOWFORK 0x00008 /* Attach parent debugger to children. */
652	#define P_PPWAIT 0x00010 /* Parent is waiting for child to exec/exit. */
653	#define P_PROFIL 0x00020 /* Has started profiling. */
654	#define P_STOPPROF 0x00040 /* Has thread requesting to stop profiling. */
655	#define P_HADTHREADS 0x00080 /* Has had threads (no cleanup shortcuts) */
656	#define P_SUGID 0x00100 /* Had set id privileges since last exec. */
657	#define P_SYSTEM 0x00200 /* System proc: no sigs, stats or swapping. */
658	#define P_SINGLE_EXIT 0x00400 /* Threads suspending should exit, not wait. */
659	#define P_TRACED 0x00800 /* Debugged process being traced. */
660	#define P_WAITED 0x01000 /* Someone is waiting for us. */
661	#define P_WEXIT 0x02000 /* Working on exiting. */
662	#define P_EXEC 0x04000 /* Process called exec. */
663	#define P_WKILLED 0x08000 /* Killed, go to kernel/user boundary ASAP. */
664	#define P_CONTINUED 0x10000 /* Proc has continued from a stopped state. */
665	#define P_STOPPED_SIG 0x20000 /* Stopped due to SIGSTOP/SIGTSTP. */
666	#define P_STOPPED_TRACE 0x40000 /* Stopped because of tracing. */
667	#define P_STOPPED_SINGLE 0x80000 /* Only 1 thread can continue (not to user). */
668	#define P_PROTECTED 0x100000 /* Do not kill on memory overcommit. */
669	#define P_SIGEVENT 0x200000 /* Process pending signals changed. */
670	#define P_SINGLE_BOUNDARY 0x400000 /* Threads should suspend at user boundary. */
671	#define P_HWPMC 0x800000 /* Process is using HWPMCs */
672	#define P_JAILED 0x1000000 /* Process is in jail. */
673	#define P_ORPHAN 0x2000000 /* Orphaned. */
674	#define P_INEXEC 0x4000000 /* Process is in execve(). */
675	#define P_STATCHILD 0x8000000 /* Child process stopped or exited. */
676	#define P_INMEM 0x10000000 /* Loaded into memory. */
677	#define P_SWAPPINGOUT 0x20000000 /* Process is being swapped out. */
678	#define P_SWAPPINGIN 0x40000000 /* Process is being swapped in. */
679	#define P_PPTRACE 0x80000000 /* PT_TRACEME by vforked child. */
680
681	#define P_STOPPED (P_STOPPED_SIG\|P_STOPPED_SINGLE\|P_STOPPED_TRACE)
682	#define P_SHOULDSTOP(p) ((p)->p_flag & P_STOPPED)
683	#define P_KILLED(p) ((p)->p_flag & P_WKILLED)
684
685	/* These flags are kept in p_flag2. */
686	#define P2_INHERIT_PROTECTED 0x00000001 /* New children get P_PROTECTED. */
687
688	/*
689	* These were process status values (p_stat), now they are only used in
690	* legacy conversion code.
691	*/
692	#define SIDL 1 /* Process being created by fork. */
693	#define SRUN 2 /* Currently runnable. */
694	#define SSLEEP 3 /* Sleeping on an address. */
695	#define SSTOP 4 /* Process debugging or suspension. */
696	#define SZOMB 5 /* Awaiting collection by parent. */
697	#define SWAIT 6 /* Waiting for interrupt. */
698	#define SLOCK 7 /* Blocked on a lock. */
699
700	#define P_MAGIC 0xbeefface
701
702	#ifdef _KERNEL
703
704	/* Types and flags for mi_switch(). */
705	#define SW_TYPE_MASK 0xff /* First 8 bits are switch type */
706	#define SWT_NONE 0 /* Unspecified switch. */
707	#define SWT_PREEMPT 1 /* Switching due to preemption. */
708	#define SWT_OWEPREEMPT 2 /* Switching due to opepreempt. */
709	#define SWT_TURNSTILE 3 /* Turnstile contention. */
710	#define SWT_SLEEPQ 4 /* Sleepq wait. */
711	#define SWT_SLEEPQTIMO 5 /* Sleepq timeout wait. */
712	#define SWT_RELINQUISH 6 /* yield call. */
713	#define SWT_NEEDRESCHED 7 /* NEEDRESCHED was set. */
714	#define SWT_IDLE 8 /* Switching from the idle thread. */
715	#define SWT_IWAIT 9 /* Waiting for interrupts. */
716	#define SWT_SUSPEND 10 /* Thread suspended. */
717	#define SWT_REMOTEPREEMPT 11 /* Remote processor preempted. */
718	#define SWT_REMOTEWAKEIDLE 12 /* Remote processor preempted idle. */
719	#define SWT_COUNT 13 /* Number of switch types. */
720	/* Flags */
721	#define SW_VOL 0x0100 /* Voluntary switch. */
722	#define SW_INVOL 0x0200 /* Involuntary switch. */
723	#define SW_PREEMPT 0x0400 /* The invol switch is a preemption */
724
725	/* How values for thread_single(). */
726	#define SINGLE_NO_EXIT 0
727	#define SINGLE_EXIT 1
728	#define SINGLE_BOUNDARY 2
729
730	#ifdef MALLOC_DECLARE
731	MALLOC_DECLARE(M_PARGS);
732	MALLOC_DECLARE(M_PGRP);
733	MALLOC_DECLARE(M_SESSION);
734	MALLOC_DECLARE(M_SUBPROC);
735	#endif
736
737	#define FOREACH_PROC_IN_SYSTEM(p) \
738	LIST_FOREACH((p), &allproc, p_list)
739	#define FOREACH_THREAD_IN_PROC(p, td) \
740	TAILQ_FOREACH((td), &(p)->p_threads, td_plist)
741
742	#define FIRST_THREAD_IN_PROC(p) TAILQ_FIRST(&(p)->p_threads)
743
744	/*
745	* We use process IDs <= pid_max <= PID_MAX; PID_MAX + 1 must also fit
746	* in a pid_t, as it is used to represent "no process group".
747	*/
748	#define PID_MAX 99999
749	#define NO_PID 100000
750	extern pid_t pid_max;
751
752	#define SESS_LEADER(p) ((p)->p_session->s_leader == (p))
753
754
755	#define STOPEVENT(p, e, v) do { \
756	if ((p)->p_stops & (e)) { \
757	PROC_LOCK(p); \
758	stopevent((p), (e), (v)); \
759	PROC_UNLOCK(p); \
760	} \
761	} while (0)
762	#define _STOPEVENT(p, e, v) do { \
763	PROC_LOCK_ASSERT(p, MA_OWNED); \
764	WITNESS_WARN(WARN_GIANTOK \| WARN_SLEEPOK, &p->p_mtx.lock_object, \
765	"checking stopevent %d", (e)); \
766	if ((p)->p_stops & (e)) \
767	stopevent((p), (e), (v)); \
768	} while (0)
769
770	/* Lock and unlock a process. */
771	#define PROC_LOCK(p) mtx_lock(&(p)->p_mtx)
772	#define PROC_TRYLOCK(p) mtx_trylock(&(p)->p_mtx)
773	#define PROC_UNLOCK(p) mtx_unlock(&(p)->p_mtx)
774	#define PROC_LOCKED(p) mtx_owned(&(p)->p_mtx)
775	#define PROC_LOCK_ASSERT(p, type) mtx_assert(&(p)->p_mtx, (type))
776
777	/* Lock and unlock a process group. */
778	#define PGRP_LOCK(pg) mtx_lock(&(pg)->pg_mtx)
779	#define PGRP_UNLOCK(pg) mtx_unlock(&(pg)->pg_mtx)
780	#define PGRP_LOCKED(pg) mtx_owned(&(pg)->pg_mtx)
781	#define PGRP_LOCK_ASSERT(pg, type) mtx_assert(&(pg)->pg_mtx, (type))
782
783	#define PGRP_LOCK_PGSIGNAL(pg) do { \
784	if ((pg) != NULL) \
785	PGRP_LOCK(pg); \
786	} while (0)
787	#define PGRP_UNLOCK_PGSIGNAL(pg) do { \
788	if ((pg) != NULL) \
789	PGRP_UNLOCK(pg); \
790	} while (0)
791
792	/* Lock and unlock a session. */
793	#define SESS_LOCK(s) mtx_lock(&(s)->s_mtx)
794	#define SESS_UNLOCK(s) mtx_unlock(&(s)->s_mtx)
795	#define SESS_LOCKED(s) mtx_owned(&(s)->s_mtx)
796	#define SESS_LOCK_ASSERT(s, type) mtx_assert(&(s)->s_mtx, (type))
797
798	#ifndef __rtems__
799	/* Hold process U-area in memory, normally for ptrace/procfs work. */
800	#define PHOLD(p) do { \
801	PROC_LOCK(p); \
802	_PHOLD(p); \
803	PROC_UNLOCK(p); \
804	} while (0)
805	#define _PHOLD(p) do { \
806	PROC_LOCK_ASSERT((p), MA_OWNED); \
807	KASSERT(!((p)->p_flag & P_WEXIT) \|\| (p) == curproc, \
808	("PHOLD of exiting process")); \
809	(p)->p_lock++; \
810	if (((p)->p_flag & P_INMEM) == 0) \
811	faultin((p)); \
812	} while (0)
813	#define PROC_ASSERT_HELD(p) do { \
814	KASSERT((p)->p_lock > 0, ("process not held")); \
815	} while (0)
816
817	#define PRELE(p) do { \
818	PROC_LOCK((p)); \
819	_PRELE((p)); \
820	PROC_UNLOCK((p)); \
821	} while (0)
822	#define _PRELE(p) do { \
823	PROC_LOCK_ASSERT((p), MA_OWNED); \
824	PROC_ASSERT_HELD(p); \
825	(--(p)->p_lock); \
826	if (((p)->p_flag & P_WEXIT) && (p)->p_lock == 0) \
827	wakeup(&(p)->p_lock); \
828	} while (0)
829	#define PROC_ASSERT_NOT_HELD(p) do { \
830	KASSERT((p)->p_lock == 0, ("process held")); \
831	} while (0)
832	#else /* __rtems__ */
833	#define PHOLD(x) do { } while (0)
834	#define PRELE(x) do { } while (0)
835	#endif /* __rtems__ */
836
837	/* Check whether a thread is safe to be swapped out. */
838	#define thread_safetoswapout(td) ((td)->td_flags & TDF_CANSWAP)
839
840	/* Control whether or not it is safe for curthread to sleep. */
841	#define THREAD_NO_SLEEPING() do { \
842	KASSERT(!(curthread->td_pflags & TDP_NOSLEEPING), \
843	("nested no sleeping")); \
844	curthread->td_pflags \|= TDP_NOSLEEPING; \
845	} while (0)
846
847	#define THREAD_SLEEPING_OK() do { \
848	KASSERT((curthread->td_pflags & TDP_NOSLEEPING), \
849	("nested sleeping ok")); \
850	curthread->td_pflags &= ~TDP_NOSLEEPING; \
851	} while (0)
852
853	#define PIDHASH(pid) (&pidhashtbl[(pid) & pidhash])
854	extern LIST_HEAD(pidhashhead, proc) *pidhashtbl;
855	extern u_long pidhash;
856	#define TIDHASH(tid) (&tidhashtbl[(tid) & tidhash])
857	extern LIST_HEAD(tidhashhead, thread) *tidhashtbl;
858	extern u_long tidhash;
859	extern struct rwlock tidhash_lock;
860
861	#define PGRPHASH(pgid) (&pgrphashtbl[(pgid) & pgrphash])
862	extern LIST_HEAD(pgrphashhead, pgrp) *pgrphashtbl;
863	extern u_long pgrphash;
864
865	extern struct sx allproc_lock;
866	extern struct sx proctree_lock;
867	extern struct mtx ppeers_lock;
868	extern struct proc proc0; /* Process slot for swapper. */
869	extern struct thread thread0; /* Primary thread in proc0. */
870	extern struct vmspace vmspace0; /* VM space for proc0. */
871	extern int hogticks; /* Limit on kernel cpu hogs. */
872	extern int lastpid;
873	extern int nprocs, maxproc; /* Current and max number of procs. */
874	extern int maxprocperuid; /* Max procs per uid. */
875	extern u_long ps_arg_cache_limit;
876
877	LIST_HEAD(proclist, proc);
878	TAILQ_HEAD(procqueue, proc);
879	TAILQ_HEAD(threadqueue, thread);
880	extern struct proclist allproc; /* List of all processes. */
881	extern struct proclist zombproc; /* List of zombie processes. */
882	extern struct proc initproc, pageproc; /* Process slots for init, pager. */
883
884	extern struct uma_zone *proc_zone;
885
886	struct proc pfind(pid_t); / Find process by id. */
887	struct proc *pfind_locked(pid_t pid);
888	struct pgrp pgfind(pid_t); / Find process group by id. */
889	struct proc zpfind(pid_t); / Find zombie process by id. */
890
891	/*
892	* pget() flags.
893	*/
894	#define PGET_HOLD 0x00001 /* Hold the process. */
895	#define PGET_CANSEE 0x00002 /* Check against p_cansee(). */
896	#define PGET_CANDEBUG 0x00004 /* Check against p_candebug(). */
897	#define PGET_ISCURRENT 0x00008 /* Check that the found process is current. */
898	#define PGET_NOTWEXIT 0x00010 /* Check that the process is not in P_WEXIT. */
899	#define PGET_NOTINEXEC 0x00020 /* Check that the process is not in P_INEXEC. */
900	#define PGET_NOTID 0x00040 /* Do not assume tid if pid > PID_MAX. */
901
902	#define PGET_WANTREAD (PGET_HOLD \| PGET_CANDEBUG \| PGET_NOTWEXIT)
903
904	int pget(pid_t pid, int flags, struct proc **pp);
905
906	void ast(struct trapframe *framep);
907	struct thread *choosethread(void);
908	int cr_cansignal(struct ucred cred, struct proc proc, int signum);
909	int enterpgrp(struct proc p, pid_t pgid, struct pgrp pgrp,
910	struct session *sess);
911	int enterthispgrp(struct proc p, struct pgrp pgrp);
912	void faultin(struct proc *p);
913	void fixjobc(struct proc p, struct pgrp pgrp, int entering);
914	int fork1(struct thread , int, int, struct proc , int , int);
915	void fork_exit(void ()(void , struct trapframe ), void ,
916	struct trapframe *);
917	void fork_return(struct thread , struct trapframe );
918	int inferior(struct proc *p);
919	void kern_yield(int);
920	#ifndef __rtems__
921	void kick_proc0(void);
922	#else /* __rtems__ */
923	#define kick_proc0()
924	#endif /* __rtems__ */
925	int leavepgrp(struct proc *p);
926	int maybe_preempt(struct thread *td);
927	void maybe_yield(void);
928	void mi_switch(int flags, struct thread *newtd);
929	int p_candebug(struct thread td, struct proc p);
930	int p_cansee(struct thread td, struct proc p);
931	int p_cansched(struct thread td, struct proc p);
932	int p_cansignal(struct thread td, struct proc p, int signum);
933	int p_canwait(struct thread td, struct proc p);
934	struct pargs *pargs_alloc(int len);
935	void pargs_drop(struct pargs *pa);
936	void pargs_hold(struct pargs *pa);
937	int proc_getargv(struct thread td, struct proc p, struct sbuf *sb);
938	int proc_getauxv(struct thread td, struct proc p, struct sbuf *sb);
939	int proc_getenvv(struct thread td, struct proc p, struct sbuf *sb);
940	void procinit(void);
941	void proc_linkup0(struct proc p, struct thread td);
942	void proc_linkup(struct proc p, struct thread td);
943	void proc_reap(struct thread td, struct proc p, int *status, int options);
944	void proc_reparent(struct proc child, struct proc newparent);
945	struct pstats *pstats_alloc(void);
946	void pstats_fork(struct pstats src, struct pstats dst);
947	void pstats_free(struct pstats *ps);
948	#ifndef __rtems__
949	int securelevel_ge(struct ucred *cr, int level);
950	int securelevel_gt(struct ucred *cr, int level);
951	#else /* __rtems__ */
952	#define securelevel_ge(x, y) 0
953	#define securelevel_gt(x, y) 0
954	#endif /* __rtems__ */
955	void sess_hold(struct session *);
956	void sess_release(struct session *);
957	int setrunnable(struct thread *);
958	void setsugid(struct proc *p);
959	int should_yield(void);
960	int sigonstack(size_t sp);
961	void sleepinit(void);
962	void stopevent(struct proc *, u_int, u_int);
963	struct thread *tdfind(lwpid_t, pid_t);
964	void threadinit(void);
965	void tidhash_add(struct thread *);
966	void tidhash_remove(struct thread *);
967	void cpu_idle(int);
968	int cpu_idle_wakeup(int);
969	extern void (cpu_idle_hook)(void); / Hook to machdep CPU idler. */
970	void cpu_switch(struct thread , struct thread , struct mtx *);
971	void cpu_throw(struct thread , struct thread ) __dead2;
972	void unsleep(struct thread *);
973	void userret(struct thread , struct trapframe );
974
975	void cpu_exit(struct thread *);
976	void exit1(struct thread *, int) __dead2;
977	struct syscall_args;
978	int cpu_fetch_syscall_args(struct thread td, struct syscall_args sa);
979	void cpu_fork(struct thread , struct proc , struct thread *, int);
980	void cpu_set_fork_handler(struct thread , void ()(void ), void );
981	void cpu_set_syscall_retval(struct thread *, int);
982	void cpu_set_upcall(struct thread td, struct thread td0);
983	#ifndef __rtems__
984	void cpu_set_upcall_kse(struct thread , void ()(void ), void ,
985	stack_t *);
986	#endif /* __rtems__ */
987	int cpu_set_user_tls(struct thread , void tls_base);
988	void cpu_thread_alloc(struct thread *);
989	void cpu_thread_clean(struct thread *);
990	void cpu_thread_exit(struct thread *);
991	void cpu_thread_free(struct thread *);
992	void cpu_thread_swapin(struct thread *);
993	void cpu_thread_swapout(struct thread *);
994	struct thread *thread_alloc(int pages);
995	int thread_alloc_stack(struct thread *, int pages);
996	void thread_exit(void) __dead2;
997	void thread_free(struct thread *td);
998	void thread_link(struct thread td, struct proc p);
999	void thread_reap(void);
1000	int thread_single(int how);
1001	void thread_single_end(void);
1002	void thread_stash(struct thread *td);
1003	void thread_stopped(struct proc *p);
1004	void childproc_stopped(struct proc *child, int reason);
1005	void childproc_continued(struct proc *child);
1006	void childproc_exited(struct proc *child);
1007	int thread_suspend_check(int how);
1008	void thread_suspend_switch(struct thread *);
1009	void thread_suspend_one(struct thread *td);
1010	void thread_unlink(struct thread *td);
1011	void thread_unsuspend(struct proc *p);
1012	int thread_unsuspend_one(struct thread *td);
1013	void thread_unthread(struct thread *td);
1014	void thread_wait(struct proc *p);
1015	struct thread thread_find(struct proc p, lwpid_t tid);
1016
1017	#ifndef __rtems__
1018	static __inline int
1019	curthread_pflags_set(int flags)
1020	{
1021	struct thread *td;
1022	int save;
1023
1024	td = curthread;
1025	save = ~flags \| (td->td_pflags & flags);
1026	td->td_pflags \|= flags;
1027	return (save);
1028	}
1029
1030	static __inline void
1031	curthread_pflags_restore(int save)
1032	{
1033
1034	curthread->td_pflags &= save;
1035	}
1036	#endif /* __rtems__ */
1037
1038	#endif /* _KERNEL */
1039
1040	#endif /* !_SYS_PROC_H_ */

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