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.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * @(#)proc.h 8.15 (Berkeley) 5/19/95
45 #include <sys/callout.h> /* For struct callout. */
46 #include <sys/event.h> /* For struct klist. */
47 #include <sys/filedesc.h>
48 #include <sys/queue.h>
49 #include <sys/priority.h>
50 #include <sys/rtprio.h> /* XXX */
52 #include <sys/signal.h>
54 #include <sys/time.h> /* For structs itimerval, timeval. */
56 #include <sys/ucred.h>
57 #include <machine/proc.h> /* Machine-dependent proc substruct. */
60 * One structure allocated per session.
63 int s_count; /* Ref cnt; pgrps in session. */
64 struct proc *s_leader; /* Session leader. */
65 struct vnode *s_ttyvp; /* Vnode of controlling terminal. */
66 struct tty *s_ttyp; /* Controlling terminal. */
67 pid_t s_sid; /* Session ID. */
68 /* Setlogin() name: */
69 char s_login[roundup(MAXLOGNAME, sizeof(long))];
73 * One structure allocated per process group.
76 LIST_ENTRY(pgrp) pg_hash; /* Hash chain. */
77 LIST_HEAD(, proc) pg_members; /* Pointer to pgrp members. */
78 struct session *pg_session; /* Pointer to session. */
79 struct sigiolst pg_sigiolst; /* List of sigio sources. */
80 pid_t pg_id; /* Pgrp id. */
81 int pg_jobc; /* # procs qualifying pgrp for job control */
85 sigset_t ps_sigignore; /* Signals being ignored. */
86 sigset_t ps_sigcatch; /* Signals being caught by user. */
88 struct sigacts *ps_sigacts; /* Signal actions, state. */
92 #define PS_NOCLDWAIT 0x0001 /* No zombies if child dies */
93 #define PS_NOCLDSTOP 0x0002 /* No SIGCHLD when children stop. */
96 * pargs, used to hold a copy of the command line, if it had a sane length.
99 u_int ar_ref; /* Reference count. */
100 u_int ar_length; /* Length. */
101 u_char ar_args[0]; /* Arguments. */
105 * Description of a process.
107 * This structure contains the information needed to manage a thread of
108 * control, known in UN*X as a process; it has references to substructures
109 * containing descriptions of things that the process uses, but may share
110 * with related processes. The process structure and the substructures
111 * are always addressable except for those marked "(CPU)" below,
112 * which might be addressable only on a processor on which the process
115 * Below is a key of locks used to protect each member of struct proc. The
116 * lock is indicated by a reference to a specific character in parens in the
117 * associated comment.
118 * * - not yet protected
119 * a - only touched by curproc or parent during fork/wait
120 * b - created at fork, never changes
121 * (exception aiods switch vmspaces, but they are also
122 * marked 'P_SYSTEM' so hopefully it will be left alone)
123 * c - locked by proc mtx
124 * d - locked by allproc_lock lock
125 * e - locked by proctree_lock lock
127 * g - process group mtx
128 * h - callout_lock mtx
129 * i - by curproc or the master session mtx
130 * j - locked by sched_lock mtx
131 * k - either by curproc or a lock which prevents the lock from
132 * going away, such as (d,e)
133 * l - the attaching proc or attaching proc parent
135 * n - not locked, lazy
137 * If the locking key specifies two identifiers (for example, p_pptr) then
138 * either lock is sufficient for read access, but both locks must be held
146 * Here we define the four structures used for process information.
148 * The first is the thread. It might be though of as a "Kernel
149 * Schedulable Entity Context".
150 * This structure contains all the information as to where a thread of
151 * execution is now, or was when it was suspended, why it was suspended,
152 * and anything else that will be needed to restart it when it is
153 * rescheduled. Always associated with a KSE when running, but can be
154 * reassigned to an equivalent KSE when being restarted for
155 * load balancing. Each of these is associated with a kernel stack
158 * It is important to remember that a particular thread structure only
159 * exists as long as the system call or kernel entrance (e.g. by pagefault)
160 * which it is currently executing. It should threfore NEVER be referenced
161 * by pointers in long lived structures that live longer than a single
162 * request. If several threads complete their work at the same time,
163 * they will all rewind their stacks to the uer boundary, report their
164 * completion state, and all but one will be freed. That last one will
165 * be kept to provide a kernel stack and pcb for the NEXT syscall or kernel
166 * entrance. (basically to save freeing and then re-allocating it) A process
167 * might keep a cache of threads available to allow it to quickly
168 * get one when it needs a new one. There would probably also be a system
169 * cache of free threads.
174 * The second structure is the Kernel Schedulable Entity. (KSE)
175 * As long as this is scheduled, it will continue to run any threads that
176 * are assigned to it or the KSEGRP (see later) until either it runs out
177 * of runnable threads or CPU.
178 * It runs on one CPU and is assigned a quantum of time. When a thread is
179 * blocked, The KSE continues to run and will search for another thread
180 * in a runnable state amongst those it has. It May decide to return to user
181 * mode with a new 'empty' thread if there are no runnable threads.
182 * threads are associated with a KSE for cache reasons, but a sheduled KSE with
183 * no runnable thread will try take a thread from a sibling KSE before
184 * surrendering its quantum. In some schemes it gets it's quantum from the KSEG
185 * and contributes to draining that quantum, along withthe other KSEs in
186 * the group. (undecided)
191 * The KSEGRP is allocated resources across a number of CPUs.
192 * (Including a number of CPUxQUANTA. It parcels these QUANTA up among
193 * Its KSEs, each of which should be running in a different CPU.
194 * Priority and total available sheduled quanta are properties of a KSEGRP.
195 * Multiple KSEGRPs in a single process compete against each other
196 * for total quanta in the same way that a forked child competes against
197 * it's parent process.
202 * A process is the owner of all system resources allocated to a task
204 * All KSEGs under one process see, and have the same access to, these
205 * resources (e.g. files, memory, sockets, permissions kqueues).
206 * A process may compete for CPU cycles on the same basis as a
207 * forked process cluster by spawning several KSEGRPs.
213 With a single run queue used by all processors:
215 RUNQ: --->KSE---KSE--... SLEEPQ:[]---THREAD---THREAD---THREAD
217 KSEG---THREAD--THREAD--THREAD []
220 (processors run THREADs from the KSEG until they are exhausted or
221 the KSEG exhausts its quantum)
223 With PER-CPU run queues:
224 KSEs on the separate run queues directly
225 They would be given priorities calculated from the KSEG.
231 * Kernel runnable context (thread).
232 * This is what is put to sleep and reactivated.
233 * The first KSE available in the correct group will run this thread.
234 * If several are available, use the one on the same CPU as last time.
237 struct proc *td_proc; /* Associated process. */
238 struct ksegrp *td_ksegrp; /* Associated KSEG. */
239 struct kse *td_last_kse; /* Where it wants to be if possible */
240 struct kse *td_kse; /* and is now if running */
242 TAILQ_ENTRY(thread) td_plist; /* All threads in this proc */
243 TAILQ_ENTRY(thread) td_kglist; /* All threads in this ksegrp */
245 /* The two queues below should someday be merged */
246 TAILQ_ENTRY(thread) td_slpq; /* (j) Sleep queue. XXXKSE */
247 TAILQ_ENTRY(thread) td_blkq; /* (j) mutex queue. XXXKSE */
248 TAILQ_ENTRY(thread) td_runq; /* (j) run queue(s). XXXKSE */
250 #define td_startzero td_flags
251 int td_flags; /* (c) P_* flags. */
252 int td_dupfd; /* (c) ret value from fdopen. XXX */
253 void *td_wchan; /* (j) Sleep address. */
254 const char *td_wmesg; /* (j) Reason for sleep. */
255 u_char td_lastcpu; /* (j) Last cpu we were on. */
256 short td_locks; /* (*) DEBUG: lockmgr count of locks */
257 struct mtx *td_blocked; /* (j) Mutex process is blocked on. */
258 struct ithd *td_ithd; /* (b) For interrupt threads only. */
259 const char *td_mtxname; /* (j) Name of mutex blocked on. */
260 LIST_HEAD(, mtx) td_contested; /* (j) Contested locks. */
261 struct lock_list_entry *td_sleeplocks; /* (k) Held sleep locks. */
262 int td_intr_nesting_level; /* (k) Interrupt recursion. */
263 #define td_endzero td_md
265 #define td_startcopy td_endzero
266 /* XXXKSE p_md is in the "on your own" section in old struct proc */
267 struct mdthread td_md; /* (k) Any machine-dependent fields. */
268 register_t td_retval[2]; /* (k) Syscall aux returns. */
269 #define td_endcopy td_pcb
271 struct pcb *td_pcb; /* (k) Kv addr of pcb and kstack. */
272 struct callout td_slpcallout; /* (h) Callout for sleep. */
273 struct trapframe *td_frame; /* (k) */
274 struct vm_object *td_kstack_obj;/* (a) kstack object. */
275 vm_offset_t td_kstack; /* kstack mapped address */
279 * The schedulable entity that can be given a context to run.
280 * A process may have several of these. Probably one per processor
281 * but posibly a few more. In this universe they are grouped
282 * with a KSEG that contains the priority and niceness
286 struct proc *ke_proc; /* Associated process. */
287 struct ksegrp *ke_ksegrp; /* Associated KSEG. */
288 struct thread *ke_thread; /* Associated thread, if running. */
289 TAILQ_ENTRY(kse) ke_kglist; /* Queue of all KSEs in ke_ksegrp. */
290 TAILQ_ENTRY(kse) ke_kgrlist; /* Queue of all KSEs in this state. */
291 TAILQ_ENTRY(kse) ke_procq; /* (j) Run queue. */
292 TAILQ_HEAD(, thread) ke_runq; /* (td_runq) RUNNABLE bound to KSE. */
294 #define ke_startzero ke_flags
295 int ke_flags; /* (c) P_* flags. */
296 /*u_int ke_estcpu; */ /* (j) Time averaged val of cpticks. */
297 int ke_cpticks; /* (j) Ticks of cpu time. */
298 fixpt_t ke_pctcpu; /* (j) %cpu during p_swtime. */
299 u_int64_t ke_uu; /* (j) Previous user time in usec. */
300 u_int64_t ke_su; /* (j) Previous system time in usec. */
301 u_int64_t ke_iu; /* (j) Previous intr time in usec. */
302 u_int64_t ke_uticks; /* (j) Statclock hits in user mode. */
303 u_int64_t ke_sticks; /* (j) Statclock hits in system mode. */
304 u_int64_t ke_iticks; /* (j) Statclock hits in intr. */
305 u_char ke_oncpu; /* (j) Which cpu we are on. */
306 u_int ke_slptime; /* (j) Time since last idle. */
307 char ke_rqindex; /* (j) Run queue index. */
308 #define ke_endzero ke_priority
310 #define ke_startcopy ke_endzero
311 u_char ke_priority; /* (j) Process priority. */
312 u_char ke_usrpri; /* (j) User pri from cpu & nice. */
313 #define ke_endcopy ke_end
315 int ke_end; /* dummy entry */
319 * Kernel-scheduled entity group (KSEG). The scheduler considers each KSEG to
320 * be an indivisible unit from a time-sharing perspective, though each KSEG may
321 * contain multiple KSEs.
324 struct proc *kg_proc; /* Process that contains this KSEG. */
325 TAILQ_ENTRY(ksegrp) kg_ksegrp; /* Queue of KSEGs in kg_proc. */
326 TAILQ_HEAD(, kse) kg_kseq; /* (ke_kglist) All KSEs */
327 TAILQ_HEAD(, kse) kg_rq; /* (ke_kgrlist) Runnable KSEs */
328 TAILQ_HEAD(, kse) kg_iq; /* (ke_kgrlist) Idle KSEs */
329 TAILQ_HEAD(, thread) kg_threads;/* (td_kglist) All threads. */
330 TAILQ_HEAD(, thread) kg_runq; /* (td_runq)unbound RUNNABLE threads */
331 TAILQ_HEAD(, thread) kg_slpq; /* (td_runq)NONRUNNABLE threads. */
333 #define kg_startzero kg_estcpu
334 u_int kg_slptime; /* (j) how long completely blocked. */
335 u_int kg_estcpu; /* sum of the same field in kses */
336 #define kg_endzero kg_pri
338 #define kg_startcopy kg_endzero
339 struct priority kg_pri; /* (j) Process priority. */
340 char kg_nice; /* (j?/k?) Process "nice" value. */
341 struct rtprio kg_rtprio; /* (j) Realtime priority. */
342 #define kg_endcopy kg_runnable
344 int kg_runnable; /* # runnable threads on queue */
345 int kg_runq_kses; /* # kse's on runq. */
346 int kg_kses; /* # kse's in group. */
350 * The old fashionned process. May have multiple threads, KSEGRPs
351 * and KSEs. Starts off with a single embedded KSEGRP, KSE and THREAD.
354 LIST_ENTRY(proc) p_list; /* (d) List of all processes. */
355 TAILQ_HEAD(, ksegrp) p_ksegrps; /* (kg_ksegrp) All KSEGs. */
356 TAILQ_HEAD(, thread) p_threads; /* (td_plist) threads. (shortcut) */
357 struct ucred *p_ucred; /* (c + k) Process owner's identity. */
358 struct filedesc *p_fd; /* (b) Ptr to open files structure. */
359 /* accumulated stats for all KSEs? */
360 struct pstats *p_stats; /* (b) Accounting/statistics (CPU). */
361 struct plimit *p_limit; /* (m) Process limits. */
362 struct vm_object *p_upages_obj; /* (a) Upages object. */
363 struct procsig *p_procsig; /* (c) Signal actions, state (CPU). */
365 struct ksegrp p_ksegrp;
367 struct thread p_thread;
370 * The following don't make too much sense..
371 * See the td_ or ke_ versions of the same flags
373 int p_flag; /* (c) P_* flags. */
374 int p_sflag; /* (j) PS_* flags. */
375 int p_stat; /* (j) S* process status. */
377 pid_t p_pid; /* (b) Process identifier. */
378 LIST_ENTRY(proc) p_hash; /* (d) Hash chain. */
379 LIST_ENTRY(proc) p_pglist; /* (c) List of processes in pgrp. */
380 struct proc *p_pptr; /* (c + e) Pointer to parent process. */
381 LIST_ENTRY(proc) p_sibling; /* (e) List of sibling processes. */
382 LIST_HEAD(, proc) p_children; /* (e) Pointer to list of children. */
384 /* The following fields are all zeroed upon creation in fork. */
385 #define p_startzero p_oppid
386 pid_t p_oppid; /* (c + e) Save ppid in ptrace. XXX */
387 struct vmspace *p_vmspace; /* (b) Address space. */
388 u_int p_swtime; /* (j) Time swapped in or out. */
389 struct itimerval p_realtimer; /* (h?/k?) Alarm timer. */
390 u_int64_t p_runtime; /* (j) Real time in microsec. */
391 int p_traceflag; /* (j?) Kernel trace points. */
392 struct vnode *p_tracep; /* (j?) Trace to vnode. */
393 sigset_t p_siglist; /* (c) Sigs arrived, not delivered. */
394 struct vnode *p_textvp; /* (b) Vnode of executable. */
395 struct mtx p_mtx; /* (k) Lock for this struct. */
396 char p_lock; /* (c) Proclock (prevent swap) count. */
397 struct klist p_klist; /* (c) Knotes attached to this proc. */
398 struct sigiolst p_sigiolst; /* (c) List of sigio sources. */
399 int p_sigparent; /* (c) Signal to parent on exit. */
400 sigset_t p_oldsigmask; /* (c) Saved mask from pre sigpause. */
401 int p_sig; /* (n) For core dump/debugger XXX. */
402 u_long p_code; /* (n) For core dump/debugger XXX. */
403 u_int p_stops; /* (c) Procfs event bitmask. */
404 u_int p_stype; /* (c) Procfs stop event type. */
405 char p_step; /* (c) Procfs stop *once* flag. */
406 u_char p_pfsflags; /* (c) Procfs flags. */
407 struct nlminfo *p_nlminfo; /* (?) only used by/for lockd */
408 void *p_aioinfo; /* (c) ASYNC I/O info. */
409 /* End area that is zeroed on creation. */
410 #define p_startcopy p_sigmask
412 /* The following fields are all copied upon creation in fork. */
413 #define p_endzero p_startcopy
414 sigset_t p_sigmask; /* (c) Current signal mask. */
415 stack_t p_sigstk; /* (c) Stack ptr and on-stack flag. */
416 int p_magic; /* (b) Magic number. */
417 char p_comm[MAXCOMLEN + 1]; /* (b) Process name. */
418 struct pgrp *p_pgrp; /* (e?/c?) Pointer to process group. */
419 struct sysentvec *p_sysent; /* (b) Syscall dispatch info. */
420 struct pargs *p_args; /* (c + k) Process arguments. */
421 /* End area that is copied on creation. */
422 #define p_endcopy p_xstat
424 u_short p_xstat; /* (c) Exit status; also stop sig. */
425 struct mdproc p_md; /* (k) Any machine-dependent fields. */
426 struct callout p_itcallout; /* (h) Interval timer callout. */
427 struct user *p_uarea; /* was p_addr. changed to break stuff */
428 u_short p_acflag; /* (c) Accounting flags. */
429 struct rusage *p_ru; /* (a) Exit information. XXX */
430 struct proc *p_peers; /* (c) */
431 struct proc *p_leader; /* (c) */
432 void *p_emuldata; /* (c) Emulator state data. */
435 #define p_rlimit p_limit->pl_rlimit
436 #define p_sigacts p_procsig->ps_sigacts
437 #define p_sigignore p_procsig->ps_sigignore
438 #define p_sigcatch p_procsig->ps_sigcatch
439 #define p_session p_pgrp->pg_session
440 #define p_pgid p_pgrp->pg_id
442 #define NOCPU 0xff /* For p_oncpu when we aren't on a CPU. */
444 /* Status values (p_stat). */
445 #define SIDL 1 /* Process being created by fork. */
446 #define SRUN 2 /* Currently runnable. */
447 #define SSLEEP 3 /* Sleeping on an address. */
448 #define SSTOP 4 /* Process debugging or suspension. */
449 #define SZOMB 5 /* Awaiting collection by parent. */
450 #define SWAIT 6 /* Waiting for interrupt. */
451 #define SMTX 7 /* Blocked on a mutex. */
453 /* These flags are kept in p_flag. */
454 #define P_ADVLOCK 0x00001 /* Process may hold a POSIX advisory lock. */
455 #define P_CONTROLT 0x00002 /* Has a controlling terminal. */
456 #define P_KTHREAD 0x00004 /* Kernel thread. (*)*/
457 #define P_NOLOAD 0x00008 /* Ignore during load avg calculations. */
458 #define P_PPWAIT 0x00010 /* Parent is waiting for child to exec/exit. */
459 #define P_SUGID 0x00100 /* Had set id privileges since last exec. */
460 #define P_SYSTEM 0x00200 /* System proc: no sigs, stats or swapping. */
461 #define P_TRACED 0x00800 /* Debugged process being traced. */
462 #define P_WAITED 0x01000 /* Debugging process has waited for child. */
463 #define P_WEXIT 0x02000 /* Working on exiting. */
464 #define P_EXEC 0x04000 /* Process called exec. */
465 #define P_KSES 0x08000 /* Process is using KSEs. */
467 /* Should be moved to machine-dependent areas. */
468 #define P_BUFEXHAUST 0x100000 /* Dirty buffers flush is in progress. */
469 #define P_COWINPROGRESS 0x400000 /* Snapshot copy-on-write in progress. */
471 #define P_JAILED 0x1000000 /* Process is in jail. */
472 #define P_OLDMASK 0x2000000 /* Need to restore mask after suspend. */
473 #define P_ALTSTACK 0x4000000 /* Have alternate signal stack. */
475 /* These flags are kept in p_sflag and are protected with sched_lock. */
476 #define PS_INMEM 0x00001 /* Loaded into memory. */
477 #define PS_PROFIL 0x00004 /* Has started profiling. */
478 #define PS_ALRMPEND 0x00020 /* Pending SIGVTALRM needs to be posted. */
479 #define PS_PROFPEND 0x00040 /* Pending SIGPROF needs to be posted. */
480 #define PS_SWAPINREQ 0x00100 /* Swapin request due to wakeup. */
481 #define PS_SWAPPING 0x00200 /* Process is being swapped. */
483 /* flags kept in td_flags */
484 #define TDF_ONRUNQ 0x00001 /* This KE is on a run queue */
485 #define TDF_SINTR 0x00008 /* Sleep is interruptible. */
486 #define TDF_TIMEOUT 0x00010 /* Timing out during sleep. */
487 #define TDF_SELECT 0x00040 /* Selecting; wakeup/waiting danger. */
488 #define TDF_CVWAITQ 0x00080 /* Proces is on a cv_waitq (not slpq). */
489 #define TDF_TIMOFAIL 0x01000 /* Timeout from sleep after we were awake. */
490 #define TDF_DEADLKTREAT 0x800000 /* Lock aquisition - deadlock treatment. */
492 /* flags kept in ke_flags */
493 #define KEF_ONRUNQ 0x00001 /* This KE is on a run queue */
494 #define KEF_OWEUPC 0x00002 /* Owe process an addupc() call at next ast. */
495 #define KEF_ASTPENDING 0x00400 /* KSE has a pending ast. */
496 #define KEF_NEEDRESCHED 0x00800 /* Process needs to yield. */
499 #define P_MAGIC 0xbeefface
503 #ifdef MALLOC_DECLARE
504 MALLOC_DECLARE(M_PARGS);
505 MALLOC_DECLARE(M_SESSION);
506 MALLOC_DECLARE(M_SUBPROC);
507 MALLOC_DECLARE(M_ZOMBIE);
510 #define FOREACH_PROC_IN_SYSTEM(p) \
511 LIST_FOREACH((p), &allproc, p_list)
512 #define FOREACH_KSEGRP_IN_PROC(p, kg) \
513 TAILQ_FOREACH((kg), &(p)->p_ksegrps, kg_ksegrp)
514 #define FOREACH_THREAD_IN_GROUP(kg, td) \
515 TAILQ_FOREACH((td), &(kg)->kg_threads, td_kglist)
516 #define FOREACH_KSE_IN_GROUP(kg, ke) \
517 TAILQ_FOREACH((ke), &(kg)->kg_kseq, ke_kglist)
518 #define FOREACH_THREAD_IN_PROC(p, td) \
519 TAILQ_FOREACH((td), &(p)->p_threads, td_plist)
522 sigonstack(size_t sp)
524 register struct thread *td = curthread;
525 struct proc *p = td->td_proc;
527 return ((p->p_flag & P_ALTSTACK) ?
528 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
529 ((p->p_sigstk.ss_size == 0) ? (p->p_sigstk.ss_flags & SS_ONSTACK) :
530 ((sp - (size_t)p->p_sigstk.ss_sp) < p->p_sigstk.ss_size))
532 ((sp - (size_t)p->p_sigstk.ss_sp) < p->p_sigstk.ss_size)
538 * Notify the current process (p) that it has a signal pending,
539 * process as soon as possible.
541 #define signotify(ke) do { \
542 mtx_assert(&sched_lock, MA_OWNED); \
543 (ke)->ke_flags |= KEF_ASTPENDING; \
546 /* Handy macro to determine if p1 can mangle p2. */
547 #define PRISON_CHECK(p1, p2) \
548 ((p1)->p_prison == NULL || (p1)->p_prison == (p2)->p_prison)
551 * We use process IDs <= PID_MAX; PID_MAX + 1 must also fit in a pid_t,
552 * as it is used to represent "no process group".
554 #define PID_MAX 99999
555 #define NO_PID 100000
557 #define SESS_LEADER(p) ((p)->p_session->s_leader == (p))
558 #define SESSHOLD(s) ((s)->s_count++)
559 #define SESSRELE(s) { \
560 if (--(s)->s_count == 0) \
561 FREE(s, M_SESSION); \
564 #define STOPEVENT(p, e, v) do { \
566 _STOPEVENT((p), (e), (v)); \
569 #define _STOPEVENT(p, e, v) do { \
570 PROC_LOCK_ASSERT(p, MA_OWNED); \
571 if ((p)->p_stops & (e)) { \
572 stopevent((p), (e), (v)); \
576 /* Lock and unlock a process. */
577 #define PROC_LOCK(p) mtx_lock(&(p)->p_mtx)
578 #define PROC_TRYLOCK(p) mtx_trylock(&(p)->p_mtx)
579 #define PROC_UNLOCK(p) mtx_unlock(&(p)->p_mtx)
580 #define PROC_UNLOCK_NOSWITCH(p) \
581 mtx_unlock_flags(&(p)->p_mtx, MTX_NOSWITCH)
582 #define PROC_LOCKED(p) mtx_owned(&(p)->p_mtx)
583 #define PROC_LOCK_ASSERT(p, type) mtx_assert(&(p)->p_mtx, (type))
585 /* Hold process U-area in memory, normally for ptrace/procfs work. */
586 #define PHOLD(p) do { \
591 #define _PHOLD(p) do { \
592 PROC_LOCK_ASSERT((p), MA_OWNED); \
593 if ((p)->p_lock++ == 0) \
597 #define PRELE(p) do { \
602 #define _PRELE(p) do { \
603 PROC_LOCK_ASSERT((p), MA_OWNED); \
607 #define PIDHASH(pid) (&pidhashtbl[(pid) & pidhash])
608 extern LIST_HEAD(pidhashhead, proc) *pidhashtbl;
609 extern u_long pidhash;
611 #define PGRPHASH(pgid) (&pgrphashtbl[(pgid) & pgrphash])
612 extern LIST_HEAD(pgrphashhead, pgrp) *pgrphashtbl;
613 extern u_long pgrphash;
615 extern struct sx allproc_lock;
616 extern struct sx proctree_lock;
617 extern struct proc proc0; /* Process slot for swapper. */
618 extern struct thread *thread0; /* Primary thread in proc0 */
619 extern int hogticks; /* Limit on kernel cpu hogs. */
620 extern int nprocs, maxproc; /* Current and max number of procs. */
621 extern int maxprocperuid; /* Max procs per uid. */
622 extern u_long ps_arg_cache_limit;
623 extern int ps_argsopen;
624 extern int ps_showallprocs;
625 extern int sched_quantum; /* Scheduling quantum in ticks. */
627 LIST_HEAD(proclist, proc);
628 TAILQ_HEAD(procqueue, proc);
629 TAILQ_HEAD(threadqueue, thread);
630 extern struct proclist allproc; /* List of all processes. */
631 extern struct proclist zombproc; /* List of zombie processes. */
632 extern struct proc *initproc, *pageproc; /* Process slots for init, pager. */
633 extern struct proc *updateproc; /* Process slot for syncer (sic). */
635 extern struct vm_zone *proc_zone;
640 * XXX macros for scheduler. Shouldn't be here, but currently needed for
641 * bounding the dubious p_estcpu inheritance in wait1().
642 * INVERSE_ESTCPU_WEIGHT is only suitable for statclock() frequencies in
643 * the range 100-256 Hz (approximately).
645 #define ESTCPULIM(e) \
646 min((e), INVERSE_ESTCPU_WEIGHT * (NICE_WEIGHT * (PRIO_MAX - PRIO_MIN) - \
647 RQ_PPQ) + INVERSE_ESTCPU_WEIGHT - 1)
648 #define INVERSE_ESTCPU_WEIGHT 8 /* 1 / (priorities per estcpu level). */
649 #define NICE_WEIGHT 1 /* Priorities per nice level. */
651 struct proc *pfind __P((pid_t)); /* Find process by id. */
652 struct pgrp *pgfind __P((pid_t)); /* Find process group by id. */
653 struct proc *zpfind __P((pid_t)); /* Find zombie process by id. */
655 void ast __P((struct trapframe *framep));
656 struct thread *choosethread __P((void));
657 int enterpgrp __P((struct proc *p, pid_t pgid, int mksess));
658 void faultin __P((struct proc *p));
659 void fixjobc __P((struct proc *p, struct pgrp *pgrp, int entering));
660 int fork1 __P((struct thread *, int, struct proc **));
661 void fork_exit __P((void (*)(void *, struct trapframe *), void *,
662 struct trapframe *));
663 void fork_return __P((struct thread *, struct trapframe *));
664 int inferior __P((struct proc *p));
665 int leavepgrp __P((struct proc *p));
666 void mi_switch __P((void));
667 int p_candebug __P((struct proc *p1, struct proc *p2));
668 int p_cansee __P((struct proc *p1, struct proc *p2));
669 int p_cansched __P((struct proc *p1, struct proc *p2));
670 int p_cansignal __P((struct proc *p1, struct proc *p2, int signum));
671 int p_trespass __P((struct proc *p1, struct proc *p2));
672 void procinit __P((void));
673 void proc_linkup __P((struct proc *p));
674 void proc_reparent __P((struct proc *child, struct proc *newparent));
675 int procrunnable __P((void));
676 void remrunqueue __P((struct thread *));
677 void resetpriority __P((struct ksegrp *));
678 int roundrobin_interval __P((void));
679 void schedclock __P((struct thread *));
680 void setrunnable __P((struct thread *));
681 void setrunqueue __P((struct thread *));
682 void setsugid __P((struct proc *p));
683 void sleepinit __P((void));
684 void stopevent __P((struct proc *, u_int, u_int));
685 void cpu_idle __P((void));
686 void cpu_switch __P((void));
687 void cpu_throw __P((void)) __dead2;
688 void unsleep __P((struct thread *));
689 void updatepri __P((struct thread *));
690 void userret __P((struct thread *, struct trapframe *, u_int));
691 void maybe_resched __P((struct ksegrp *));
693 void cpu_exit __P((struct thread *));
694 void exit1 __P((struct thread *, int)) __dead2;
695 void cpu_fork __P((struct thread *, struct proc *, int));
696 void cpu_set_fork_handler __P((struct thread *, void (*)(void *), void *));
697 int trace_req __P((struct proc *));
698 void cpu_wait __P((struct proc *));
699 int cpu_coredump __P((struct thread *, struct vnode *, struct ucred *));
702 #endif /* !_SYS_PROC_H_ */