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34 * @(#)proc.h 8.15 (Berkeley) 5/19/95
41 #include <sys/callout.h> /* For struct callout. */
42 #include <sys/event.h> /* For struct klist. */
44 #include <sys/filedesc.h>
46 #include <sys/queue.h>
47 #include <sys/_lock.h>
48 #include <sys/_mutex.h>
49 #include <sys/priority.h>
50 #include <sys/rtprio.h> /* XXX. */
52 #include <sys/sigio.h>
53 #include <sys/signal.h>
54 #include <sys/signalvar.h>
56 #include <sys/time.h> /* For structs itimerval, timeval. */
60 #include <sys/ucontext.h>
61 #include <sys/ucred.h>
62 #include <machine/proc.h> /* Machine-dependent proc substruct. */
65 * One structure allocated per session.
68 * (m) locked by s_mtx mtx
69 * (e) locked by proctree_lock sx
70 * (c) const until freeing
73 int s_count; /* (m) Ref cnt; pgrps in session. */
74 struct proc *s_leader; /* (m + e) Session leader. */
75 struct vnode *s_ttyvp; /* (m) Vnode of controlling tty. */
76 struct tty *s_ttyp; /* (m) Controlling tty. */
77 pid_t s_sid; /* (c) Session ID. */
78 /* (m) Setlogin() name: */
79 char s_login[roundup(MAXLOGNAME, sizeof(long))];
80 struct mtx s_mtx; /* Mutex to protect members. */
84 * One structure allocated per process group.
87 * (m) locked by pg_mtx mtx
88 * (e) locked by proctree_lock sx
89 * (c) const until freeing
92 LIST_ENTRY(pgrp) pg_hash; /* (e) Hash chain. */
93 LIST_HEAD(, proc) pg_members; /* (m + e) Pointer to pgrp members. */
94 struct session *pg_session; /* (c) Pointer to session. */
95 struct sigiolst pg_sigiolst; /* (m) List of sigio sources. */
96 pid_t pg_id; /* (c) Process group id. */
97 int pg_jobc; /* (m) Job control process count. */
98 struct mtx pg_mtx; /* Mutex to protect members */
102 * pargs, used to hold a copy of the command line, if it had a sane length.
105 u_int ar_ref; /* Reference count. */
106 u_int ar_length; /* Length. */
107 u_char ar_args[1]; /* Arguments. */
111 * Description of a process.
113 * This structure contains the information needed to manage a thread of
114 * control, known in UN*X as a process; it has references to substructures
115 * containing descriptions of things that the process uses, but may share
116 * with related processes. The process structure and the substructures
117 * are always addressable except for those marked "(CPU)" below,
118 * which might be addressable only on a processor on which the process
121 * Below is a key of locks used to protect each member of struct proc. The
122 * lock is indicated by a reference to a specific character in parens in the
123 * associated comment.
124 * * - not yet protected
125 * a - only touched by curproc or parent during fork/wait
126 * b - created at fork, never changes
127 * (exception aiods switch vmspaces, but they are also
128 * marked 'P_SYSTEM' so hopefully it will be left alone)
129 * c - locked by proc mtx
130 * d - locked by allproc_lock lock
131 * e - locked by proctree_lock lock
133 * g - process group mtx
134 * h - callout_lock mtx
135 * i - by curproc or the master session mtx
136 * j - locked by sched_lock mtx
137 * k - only accessed by curthread
138 * k*- only accessed by curthread and from an interrupt
139 * l - the attaching proc or attaching proc parent
141 * n - not locked, lazy
143 * p - select lock (sellock)
144 * q - td_contested lock
146 * x - created at fork, only changes during single threading in exec
147 * z - zombie threads/ksegroup lock
149 * If the locking key specifies two identifiers (for example, p_pptr) then
150 * either lock is sufficient for read access, but both locks must be held
161 struct mqueue_notifier;
164 * Here we define the three structures used for process information.
166 * The first is the thread. It might be thought of as a "Kernel
167 * Schedulable Entity Context".
168 * This structure contains all the information as to where a thread of
169 * execution is now, or was when it was suspended, why it was suspended,
170 * and anything else that will be needed to restart it when it is
171 * rescheduled. Always associated with a KSE when running, but can be
172 * reassigned to an equivalent KSE when being restarted for
173 * load balancing. Each of these is associated with a kernel stack
176 * It is important to remember that a particular thread structure may only
177 * exist as long as the system call or kernel entrance (e.g. by pagefault)
178 * which it is currently executing. It should therefore NEVER be referenced
179 * by pointers in long lived structures that live longer than a single
180 * request. If several threads complete their work at the same time,
181 * they will all rewind their stacks to the user boundary, report their
182 * completion state, and all but one will be freed. That last one will
183 * be kept to provide a kernel stack and pcb for the NEXT syscall or kernel
184 * entrance (basically to save freeing and then re-allocating it). The existing
185 * thread keeps a cached spare thread available to allow it to quickly
186 * get one when it needs a new one. There is also a system
187 * cache of free threads. Threads have priority and partake in priority
188 * inheritance schemes.
193 * The KSEGRP is allocated resources across a number of CPUs.
194 * (Including a number of CPUxQUANTA. It parcels these QUANTA up among
195 * its threads, each of which should be running in a different CPU.
196 * BASE priority and total available quanta are properties of a KSEGRP.
197 * Multiple KSEGRPs in a single process compete against each other
198 * for total quanta in the same way that a forked child competes against
199 * it's parent process.
204 * A process is the owner of all system resources allocated to a task
206 * All KSEGs under one process see, and have the same access to, these
207 * resources (e.g. files, memory, sockets, credential, kqueues).
208 * A process may compete for CPU cycles on the same basis as a
209 * forked process cluster by spawning several KSEGRPs.
215 With a single run queue used by all processors:
217 RUNQ: --->KSE---KSE--... SLEEPQ:[]---THREAD---THREAD---THREAD
219 KSEG---THREAD--THREAD--THREAD []
222 (processors run THREADs from the KSEG until they are exhausted or
223 the KSEG exhausts its quantum)
225 With PER-CPU run queues:
226 KSEs on the separate run queues directly
227 They would be given priorities calculated from the KSEG.
233 * Kernel runnable context (thread).
234 * This is what is put to sleep and reactivated.
235 * The first KSE available in the correct group will run this thread.
236 * If several are available, use the one on the same CPU as last time.
237 * When waiting to be run, threads are hung off the KSEGRP in priority order.
238 * With N runnable and queued KSEs in the KSEGRP, the first N threads
239 * are linked to them. Other threads are not yet assigned.
242 struct proc *td_proc; /* (*) Associated process. */
243 struct ksegrp *td_ksegrp; /* (*) Associated KSEG. */
244 TAILQ_ENTRY(thread) td_plist; /* (*) All threads in this proc. */
245 TAILQ_ENTRY(thread) td_kglist; /* (*) All threads in this ksegrp. */
247 /* The two queues below should someday be merged. */
248 TAILQ_ENTRY(thread) td_slpq; /* (j) Sleep queue. */
249 TAILQ_ENTRY(thread) td_lockq; /* (j) Lock queue. */
250 TAILQ_ENTRY(thread) td_runq; /* (j/z) Run queue(s). XXXKSE */
252 TAILQ_HEAD(, selinfo) td_selq; /* (p) List of selinfos. */
253 struct sleepqueue *td_sleepqueue; /* (k) Associated sleep queue. */
254 struct turnstile *td_turnstile; /* (k) Associated turnstile. */
255 struct umtx_q *td_umtxq; /* (c?) Link for when we're blocked. */
256 lwpid_t td_tid; /* (b) Thread ID. */
257 sigqueue_t td_sigqueue; /* (c) Sigs arrived, not delivered. */
258 #define td_siglist td_sigqueue.sq_signals
260 /* Cleared during fork1() or thread_schedule_upcall(). */
261 #define td_startzero td_flags
262 int td_flags; /* (j) TDF_* flags. */
263 int td_inhibitors; /* (j) Why can not run. */
264 int td_pflags; /* (k) Private thread (TDP_*) flags. */
265 int td_dupfd; /* (k) Ret value from fdopen. XXX */
266 void *td_wchan; /* (j) Sleep address. */
267 const char *td_wmesg; /* (j) Reason for sleep. */
268 u_char td_lastcpu; /* (j) Last cpu we were on. */
269 u_char td_oncpu; /* (j) Which cpu we are on. */
270 volatile u_char td_owepreempt; /* (k*) Preempt on last critical_exit */
271 short td_locks; /* (k) DEBUG: lockmgr count of locks. */
272 struct turnstile *td_blocked; /* (j) Lock process is blocked on. */
273 const char *td_lockname; /* (j) Name of lock blocked on. */
274 LIST_HEAD(, turnstile) td_contested; /* (q) Contested locks. */
275 struct lock_list_entry *td_sleeplocks; /* (k) Held sleep locks. */
276 int td_intr_nesting_level; /* (k) Interrupt recursion. */
277 int td_pinned; /* (k) Temporary cpu pin count. */
278 struct kse_thr_mailbox *td_mailbox; /* (*) Userland mailbox address. */
279 struct ucred *td_ucred; /* (k) Reference to credentials. */
280 struct thread *td_standin; /* (k + a) Use this for an upcall. */
281 struct kse_upcall *td_upcall; /* (k + j) Upcall structure. */
282 u_int64_t td_sticks; /* (k) Statclock hits in system mode. */
283 u_int td_uuticks; /* (k) Statclock hits (usr), for UTS. */
284 u_int td_usticks; /* (k) Statclock hits (sys), for UTS. */
285 int td_intrval; /* (j) Return value of TDF_INTERRUPT. */
286 sigset_t td_oldsigmask; /* (k) Saved mask from pre sigpause. */
287 sigset_t td_sigmask; /* (c) Current signal mask. */
288 volatile u_int td_generation; /* (k) For detection of preemption */
289 stack_t td_sigstk; /* (k) Stack ptr and on-stack flag. */
290 int td_kflags; /* (c) Flags for KSE threading. */
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 #define td_endzero td_base_pri
296 /* Copied during fork1() or thread_sched_upcall(). */
297 #define td_startcopy td_endzero
298 u_char td_base_pri; /* (j) Thread base kernel priority. */
299 u_char td_priority; /* (j) Thread active priority. */
300 #define td_endcopy td_pcb
303 * Fields that must be manually set in fork1() or thread_sched_upcall()
304 * or already have been set in the allocator, constructor, etc.
306 struct pcb *td_pcb; /* (k) Kernel VA of pcb and kstack. */
314 register_t td_retval[2]; /* (k) Syscall aux returns. */
315 struct callout td_slpcallout; /* (h) Callout for sleep. */
316 struct trapframe *td_frame; /* (k) */
317 struct vm_object *td_kstack_obj;/* (a) Kstack object. */
318 vm_offset_t td_kstack; /* (a) Kernel VA of kstack. */
319 int td_kstack_pages; /* (a) Size of the kstack. */
320 struct vm_object *td_altkstack_obj;/* (a) Alternate kstack object. */
321 vm_offset_t td_altkstack; /* (a) Kernel VA of alternate kstack. */
322 int td_altkstack_pages; /* (a) Size of alternate kstack. */
323 volatile u_int td_critnest; /* (k*) Critical section nest level. */
324 struct mdthread td_md; /* (k) Any machine-dependent fields. */
325 struct td_sched *td_sched; /* (*) Scheduler-specific data. */
329 * Flags kept in td_flags:
330 * To change these you MUST have the scheduler lock.
332 #define TDF_BORROWING 0x00000001 /* Thread is borrowing pri from another. */
333 #define TDF_INPANIC 0x00000002 /* Caused a panic, let it drive crashdump. */
334 #define TDF_SINTR 0x00000008 /* Sleep is interruptible. */
335 #define TDF_TIMEOUT 0x00000010 /* Timing out during sleep. */
336 #define TDF_IDLETD 0x00000020 /* This is a per-CPU idle thread. */
337 #define TDF_SELECT 0x00000040 /* Selecting; wakeup/waiting danger. */
338 #define TDF_UNUSED7 0x00000080 /* --available -- */
339 #define TDF_TSNOBLOCK 0x00000100 /* Don't block on a turnstile due to race. */
340 #define TDF_UNUSED9 0x00000200 /* --available -- */
341 #define TDF_BOUNDARY 0x00000400 /* Thread suspended at user boundary */
342 #define TDF_ASTPENDING 0x00000800 /* Thread has some asynchronous events. */
343 #define TDF_TIMOFAIL 0x00001000 /* Timeout from sleep after we were awake. */
344 #define TDF_INTERRUPT 0x00002000 /* Thread is marked as interrupted. */
345 #define TDF_UNUSED14 0x00004000 /* --available -- */
346 #define TDF_UNUSED15 0x00008000 /* --available -- */
347 #define TDF_NEEDRESCHED 0x00010000 /* Thread needs to yield. */
348 #define TDF_NEEDSIGCHK 0x00020000 /* Thread may need signal delivery. */
349 #define TDF_XSIG 0x00040000 /* Thread is exchanging signal under trace */
350 #define TDF_UMTXQ 0x00080000 /* Thread is sleeping on a umtx. */
351 #define TDF_THRWAKEUP 0x00100000 /* Libthr thread must not suspend itself. */
352 #define TDF_DBSUSPEND 0x00200000 /* Thread is suspended by debugger */
353 #define TDF_UNUSED22 0x00400000 /* --available -- */
354 #define TDF_UNUSED23 0x00800000 /* --available -- */
355 #define TDF_SCHED0 0x01000000 /* Reserved for scheduler private use */
356 #define TDF_SCHED1 0x02000000 /* Reserved for scheduler private use */
357 #define TDF_SCHED2 0x04000000 /* Reserved for scheduler private use */
358 #define TDF_SCHED3 0x08000000 /* Reserved for scheduler private use */
361 * "Private" flags kept in td_pflags:
362 * These are only accessed by curthread and thus need no locking.
364 #define TDP_OLDMASK 0x00000001 /* Need to restore mask after suspend. */
365 #define TDP_INKTR 0x00000002 /* Thread is currently in KTR code. */
366 #define TDP_INKTRACE 0x00000004 /* Thread is currently in KTRACE code. */
367 #define TDP_UPCALLING 0x00000008 /* This thread is doing an upcall. */
368 #define TDP_COWINPROGRESS 0x00000010 /* Snapshot copy-on-write in progress. */
369 #define TDP_ALTSTACK 0x00000020 /* Have alternate signal stack. */
370 #define TDP_DEADLKTREAT 0x00000040 /* Lock aquisition - deadlock treatment. */
371 #define TDP_SA 0x00000080 /* A scheduler activation based thread. */
372 #define TDP_NOSLEEPING 0x00000100 /* Thread is not allowed to sleep on a sq. */
373 #define TDP_OWEUPC 0x00000200 /* Call addupc() at next AST. */
374 #define TDP_ITHREAD 0x00000400 /* Thread is an interrupt thread. */
375 #define TDP_CAN_UNBIND 0x00000800 /* Only temporarily bound. */
376 #define TDP_SCHED1 0x00001000 /* Reserved for scheduler private use */
377 #define TDP_SCHED2 0x00002000 /* Reserved for scheduler private use */
378 #define TDP_SCHED3 0x00004000 /* Reserved for scheduler private use */
379 #define TDP_SCHED4 0x00008000 /* Reserved for scheduler private use */
380 #define TDP_GEOM 0x00010000 /* Settle GEOM before finishing syscall */
381 #define TDP_SOFTDEP 0x00020000 /* Stuck processing softdep worklist */
382 #define TDP_NORUNNINGBUF 0x00040000 /* Ignore runningbufspace check */
385 * Reasons that the current thread can not be run yet.
386 * More than one may apply.
388 #define TDI_SUSPENDED 0x0001 /* On suspension queue. */
389 #define TDI_SLEEPING 0x0002 /* Actually asleep! (tricky). */
390 #define TDI_SWAPPED 0x0004 /* Stack not in mem. Bad juju if run. */
391 #define TDI_LOCK 0x0008 /* Stopped on a lock. */
392 #define TDI_IWAIT 0x0010 /* Awaiting interrupt. */
395 * flags (in kflags) related to M:N threading.
397 #define TDK_KSEREL 0x0001 /* Blocked in msleep on kg->kg_completed. */
398 #define TDK_KSERELSIG 0x0002 /* Blocked in msleep on p->p_siglist. */
399 #define TDK_WAKEUP 0x0004 /* Thread has been woken by kse_wakeup. */
401 #define TD_CAN_UNBIND(td) \
402 (((td)->td_pflags & TDP_CAN_UNBIND) && \
403 ((td)->td_upcall != NULL))
405 #define TD_IS_SLEEPING(td) ((td)->td_inhibitors & TDI_SLEEPING)
406 #define TD_ON_SLEEPQ(td) ((td)->td_wchan != NULL)
407 #define TD_IS_SUSPENDED(td) ((td)->td_inhibitors & TDI_SUSPENDED)
408 #define TD_IS_SWAPPED(td) ((td)->td_inhibitors & TDI_SWAPPED)
409 #define TD_ON_LOCK(td) ((td)->td_inhibitors & TDI_LOCK)
410 #define TD_AWAITING_INTR(td) ((td)->td_inhibitors & TDI_IWAIT)
411 #define TD_IS_RUNNING(td) ((td)->td_state == TDS_RUNNING)
412 #define TD_ON_RUNQ(td) ((td)->td_state == TDS_RUNQ)
413 #define TD_CAN_RUN(td) ((td)->td_state == TDS_CAN_RUN)
414 #define TD_IS_INHIBITED(td) ((td)->td_state == TDS_INHIBITED)
416 #define TD_SET_INHIB(td, inhib) do { \
417 (td)->td_state = TDS_INHIBITED; \
418 (td)->td_inhibitors |= (inhib); \
421 #define TD_CLR_INHIB(td, inhib) do { \
422 if (((td)->td_inhibitors & (inhib)) && \
423 (((td)->td_inhibitors &= ~(inhib)) == 0)) \
424 (td)->td_state = TDS_CAN_RUN; \
427 #define TD_SET_SLEEPING(td) TD_SET_INHIB((td), TDI_SLEEPING)
428 #define TD_SET_SWAPPED(td) TD_SET_INHIB((td), TDI_SWAPPED)
429 #define TD_SET_LOCK(td) TD_SET_INHIB((td), TDI_LOCK)
430 #define TD_SET_SUSPENDED(td) TD_SET_INHIB((td), TDI_SUSPENDED)
431 #define TD_SET_IWAIT(td) TD_SET_INHIB((td), TDI_IWAIT)
432 #define TD_SET_EXITING(td) TD_SET_INHIB((td), TDI_EXITING)
434 #define TD_CLR_SLEEPING(td) TD_CLR_INHIB((td), TDI_SLEEPING)
435 #define TD_CLR_SWAPPED(td) TD_CLR_INHIB((td), TDI_SWAPPED)
436 #define TD_CLR_LOCK(td) TD_CLR_INHIB((td), TDI_LOCK)
437 #define TD_CLR_SUSPENDED(td) TD_CLR_INHIB((td), TDI_SUSPENDED)
438 #define TD_CLR_IWAIT(td) TD_CLR_INHIB((td), TDI_IWAIT)
440 #define TD_SET_RUNNING(td) (td)->td_state = TDS_RUNNING
441 #define TD_SET_RUNQ(td) (td)->td_state = TDS_RUNQ
442 #define TD_SET_CAN_RUN(td) (td)->td_state = TDS_CAN_RUN
445 * An upcall is used when returning to userland. If a thread does not have
446 * an upcall on return to userland the thread exports its context and exits.
449 TAILQ_ENTRY(kse_upcall) ku_link; /* List of upcalls in KSEG. */
450 struct ksegrp *ku_ksegrp; /* Associated KSEG. */
451 struct thread *ku_owner; /* Owning thread. */
452 int ku_flags; /* KUF_* flags. */
453 struct kse_mailbox *ku_mailbox; /* Userland mailbox address. */
454 stack_t ku_stack; /* Userland upcall stack. */
455 void *ku_func; /* Userland upcall function. */
456 unsigned int ku_mflags; /* Cached upcall mbox flags. */
459 #define KUF_DOUPCALL 0x00001 /* Do upcall now; don't wait. */
460 #define KUF_EXITING 0x00002 /* Upcall structure is exiting. */
463 * Kernel-scheduled entity group (KSEG). The scheduler considers each KSEG to
464 * be an indivisible unit from a time-sharing perspective, though each KSEG may
465 * contain multiple KSEs.
468 struct proc *kg_proc; /* (*) Proc that contains this KSEG. */
469 TAILQ_ENTRY(ksegrp) kg_ksegrp; /* (*) Queue of KSEGs in kg_proc. */
470 TAILQ_HEAD(, thread) kg_threads;/* (td_kglist) All threads. */
471 TAILQ_HEAD(, thread) kg_runq; /* (td_runq) waiting RUNNABLE threads */
472 TAILQ_HEAD(, kse_upcall) kg_upcalls; /* All upcalls in the group. */
474 #define kg_startzero kg_estcpu
475 u_int kg_estcpu; /* (j) Sum of the same field in KSEs. */
476 u_int kg_slptime; /* (j) How long completely blocked. */
477 int kg_numupcalls; /* (j) Num upcalls. */
478 int kg_upsleeps; /* (c) Num threads in kse_release(). */
479 struct kse_thr_mailbox *kg_completed; /* (c) Completed thread mboxes. */
480 int kg_nextupcall; /* (n) Next upcall time. */
481 int kg_upquantum; /* (n) Quantum to schedule an upcall. */
482 #define kg_endzero kg_pri_class
484 #define kg_startcopy kg_endzero
485 u_char kg_pri_class; /* (j) Scheduling class. */
486 u_char kg_user_pri; /* (j) User pri from estcpu and nice. */
487 #define kg_endcopy kg_numthreads
488 int kg_numthreads; /* (j) Num threads in total. */
489 struct kg_sched *kg_sched; /* (*) Scheduler-specific data. */
493 * XXX: Does this belong in resource.h or resourcevar.h instead?
494 * Resource usage extension. The times in rusage structs in the kernel are
495 * never up to date. The actual times are kept as runtimes and tick counts
496 * (with control info in the "previous" times), and are converted when
497 * userland asks for rusage info. Backwards compatibility prevents putting
498 * this directly in the user-visible rusage struct.
500 * Locking: (cj) means (j) for p_rux and (c) for p_crux.
503 struct bintime rux_runtime; /* (cj) Real time. */
504 u_int64_t rux_uticks; /* (cj) Statclock hits in user mode. */
505 u_int64_t rux_sticks; /* (cj) Statclock hits in sys mode. */
506 u_int64_t rux_iticks; /* (cj) Statclock hits in intr mode. */
507 u_int64_t rux_uu; /* (c) Previous user time in usec. */
508 u_int64_t rux_su; /* (c) Previous sys time in usec. */
509 u_int64_t rux_iu; /* (c) Previous intr time in usec. */
513 * The old fashionned process. May have multiple threads, KSEGRPs
514 * and KSEs. Starts off with a single embedded KSEGRP and THREAD.
517 LIST_ENTRY(proc) p_list; /* (d) List of all processes. */
518 TAILQ_HEAD(, ksegrp) p_ksegrps; /* (c)(kg_ksegrp) All KSEGs. */
519 TAILQ_HEAD(, thread) p_threads; /* (j)(td_plist) Threads. (shortcut) */
520 TAILQ_HEAD(, thread) p_suspended; /* (td_runq) Suspended threads. */
521 struct ucred *p_ucred; /* (c) Process owner's identity. */
522 struct filedesc *p_fd; /* (b) Open files. */
523 struct filedesc_to_leader *p_fdtol; /* (b) Tracking node */
524 /* Accumulated stats for all threads? */
525 struct pstats *p_stats; /* (b) Accounting/statistics (CPU). */
526 struct plimit *p_limit; /* (c) Process limits. */
527 struct sigacts *p_sigacts; /* (x) Signal actions, state (CPU). */
530 * The following don't make too much sense.
531 * See the td_ or ke_ versions of the same flags.
533 int p_flag; /* (c) P_* flags. */
534 int p_sflag; /* (j) PS_* flags. */
536 PRS_NEW = 0, /* In creation */
537 PRS_NORMAL, /* threads can be run. */
539 } p_state; /* (j/c) S* process status. */
541 pid_t p_pid; /* (b) Process identifier. */
542 LIST_ENTRY(proc) p_hash; /* (d) Hash chain. */
543 LIST_ENTRY(proc) p_pglist; /* (g + e) List of processes in pgrp. */
544 struct proc *p_pptr; /* (c + e) Pointer to parent process. */
545 LIST_ENTRY(proc) p_sibling; /* (e) List of sibling processes. */
546 LIST_HEAD(, proc) p_children; /* (e) Pointer to list of children. */
547 struct mtx p_mtx; /* (n) Lock for this struct. */
548 struct ksiginfo *p_ksi; /* Locked by parent proc lock */
549 sigqueue_t p_sigqueue; /* (c) Sigs not delivered to a td. */
550 #define p_siglist p_sigqueue.sq_signals
552 /* The following fields are all zeroed upon creation in fork. */
553 #define p_startzero p_oppid
554 pid_t p_oppid; /* (c + e) Save ppid in ptrace. XXX */
555 struct vmspace *p_vmspace; /* (b) Address space. */
556 u_int p_swtime; /* (j) Time swapped in or out. */
557 struct itimerval p_realtimer; /* (c) Alarm timer. */
558 struct rusage_ext p_rux; /* (cj) Internal resource usage. */
559 struct rusage_ext p_crux; /* (c) Internal child resource usage. */
560 int p_profthreads; /* (c) Num threads in addupc_task. */
561 int p_maxthrwaits; /* (c) Max threads num waiters */
562 int p_traceflag; /* (o) Kernel trace points. */
563 struct vnode *p_tracevp; /* (c + o) Trace to vnode. */
564 struct ucred *p_tracecred; /* (o) Credentials to trace with. */
565 struct vnode *p_textvp; /* (b) Vnode of executable. */
566 char p_lock; /* (c) Proclock (prevent swap) count. */
567 struct sigiolst p_sigiolst; /* (c) List of sigio sources. */
568 int p_sigparent; /* (c) Signal to parent on exit. */
569 int p_sig; /* (n) For core dump/debugger XXX. */
570 u_long p_code; /* (n) For core dump/debugger XXX. */
571 u_int p_stops; /* (c) Stop event bitmask. */
572 u_int p_stype; /* (c) Stop event type. */
573 char p_step; /* (c) Process is stopped. */
574 u_char p_pfsflags; /* (c) Procfs flags. */
575 struct nlminfo *p_nlminfo; /* (?) Only used by/for lockd. */
576 struct kaioinfo *p_aioinfo; /* (c) ASYNC I/O info. */
577 struct thread *p_singlethread;/* (c + j) If single threading this is it */
578 int p_suspcount; /* (c) Num threads in suspended mode. */
579 struct thread *p_xthread; /* (c) Trap thread */
580 int p_boundary_count;/* (c) Num threads at user boundary */
581 struct ksegrp *p_procscopegrp;
582 int p_pendingcnt; /* how many signals are pending */
583 struct itimers *p_itimers; /* (c) POSIX interval timers. */
584 /* End area that is zeroed on creation. */
585 #define p_endzero p_magic
587 /* The following fields are all copied upon creation in fork. */
588 #define p_startcopy p_endzero
589 u_int p_magic; /* (b) Magic number. */
590 char p_comm[MAXCOMLEN + 1]; /* (b) Process name. */
591 struct pgrp *p_pgrp; /* (c + e) Pointer to process group. */
592 struct sysentvec *p_sysent; /* (b) Syscall dispatch info. */
593 struct pargs *p_args; /* (c) Process arguments. */
594 rlim_t p_cpulimit; /* (j) Current CPU limit in seconds. */
595 signed char p_nice; /* (c + j) Process "nice" value. */
596 /* End area that is copied on creation. */
597 #define p_endcopy p_xstat
599 u_short p_xstat; /* (c) Exit status; also stop sig. */
600 struct knlist p_klist; /* (c) Knotes attached to this proc. */
601 int p_numthreads; /* (j) Number of threads. */
602 int p_numksegrps; /* (c) Number of ksegrps. */
603 struct mdproc p_md; /* Any machine-dependent fields. */
604 struct callout p_itcallout; /* (h + c) Interval timer callout. */
605 u_short p_acflag; /* (c) Accounting flags. */
606 struct rusage *p_ru; /* (a) Exit information. XXX */
607 struct proc *p_peers; /* (r) */
608 struct proc *p_leader; /* (b) */
609 void *p_emuldata; /* (c) Emulator state data. */
610 struct label *p_label; /* (*) Proc (not subject) MAC label. */
611 struct p_sched *p_sched; /* (*) Scheduler-specific data. */
612 STAILQ_HEAD(, ktr_request) p_ktr; /* (o) KTR event queue. */
613 LIST_HEAD(, mqueue_notifier) p_mqnotifier; /* (c) mqueue notifiers.*/
616 #define p_session p_pgrp->pg_session
617 #define p_pgid p_pgrp->pg_id
619 #define NOCPU 0xff /* For when we aren't on a CPU. */
622 /* These flags are kept in p_flag. */
623 #define P_ADVLOCK 0x00001 /* Process may hold a POSIX advisory lock. */
624 #define P_CONTROLT 0x00002 /* Has a controlling terminal. */
625 #define P_KTHREAD 0x00004 /* Kernel thread (*). */
626 #define P_NOLOAD 0x00008 /* Ignore during load avg calculations. */
627 #define P_PPWAIT 0x00010 /* Parent is waiting for child to exec/exit. */
628 #define P_PROFIL 0x00020 /* Has started profiling. */
629 #define P_STOPPROF 0x00040 /* Has thread requesting to stop profiling. */
630 #define P_HADTHREADS 0x00080 /* Has had threads (no cleanup shortcuts) */
631 #define P_SUGID 0x00100 /* Had set id privileges since last exec. */
632 #define P_SYSTEM 0x00200 /* System proc: no sigs, stats or swapping. */
633 #define P_SINGLE_EXIT 0x00400 /* Threads suspending should exit, not wait. */
634 #define P_TRACED 0x00800 /* Debugged process being traced. */
635 #define P_WAITED 0x01000 /* Someone is waiting for us. */
636 #define P_WEXIT 0x02000 /* Working on exiting. */
637 #define P_EXEC 0x04000 /* Process called exec. */
638 #define P_SA 0x08000 /* Using scheduler activations. */
639 #define P_CONTINUED 0x10000 /* Proc has continued from a stopped state. */
640 #define P_STOPPED_SIG 0x20000 /* Stopped due to SIGSTOP/SIGTSTP. */
641 #define P_STOPPED_TRACE 0x40000 /* Stopped because of tracing. */
642 #define P_STOPPED_SINGLE 0x80000 /* Only 1 thread can continue (not to user). */
643 #define P_PROTECTED 0x100000 /* Do not kill on memory overcommit. */
644 #define P_SIGEVENT 0x200000 /* Process pending signals changed. */
645 #define P_SINGLE_BOUNDARY 0x400000 /* Threads should suspend at user boundary. */
646 #define P_HWPMC 0x800000 /* Process is using HWPMCs */
648 #define P_JAILED 0x1000000 /* Process is in jail. */
649 #define P_INEXEC 0x4000000 /* Process is in execve(). */
650 #define P_STATCHILD 0x8000000 /* Child process stopped or exited. */
652 #define P_STOPPED (P_STOPPED_SIG|P_STOPPED_SINGLE|P_STOPPED_TRACE)
653 #define P_SHOULDSTOP(p) ((p)->p_flag & P_STOPPED)
655 /* These flags are kept in p_sflag and are protected with sched_lock. */
656 #define PS_INMEM 0x00001 /* Loaded into memory. */
657 #define PS_XCPU 0x00002 /* Exceeded CPU limit. */
658 #define PS_ALRMPEND 0x00020 /* Pending SIGVTALRM needs to be posted. */
659 #define PS_PROFPEND 0x00040 /* Pending SIGPROF needs to be posted. */
660 #define PS_SWAPINREQ 0x00100 /* Swapin request due to wakeup. */
661 #define PS_SWAPPINGOUT 0x00200 /* Process is being swapped out. */
662 #define PS_SWAPPINGIN 0x04000 /* Process is being swapped in. */
663 #define PS_MACPEND 0x08000 /* AST-based MAC event pending. */
666 * These were process status values (p_stat), now they are only used in
667 * legacy conversion code.
669 #define SIDL 1 /* Process being created by fork. */
670 #define SRUN 2 /* Currently runnable. */
671 #define SSLEEP 3 /* Sleeping on an address. */
672 #define SSTOP 4 /* Process debugging or suspension. */
673 #define SZOMB 5 /* Awaiting collection by parent. */
674 #define SWAIT 6 /* Waiting for interrupt. */
675 #define SLOCK 7 /* Blocked on a lock. */
677 #define P_MAGIC 0xbeefface
681 /* Flags for mi_switch(). */
682 #define SW_VOL 0x0001 /* Voluntary switch. */
683 #define SW_INVOL 0x0002 /* Involuntary switch. */
684 #define SW_PREEMPT 0x0004 /* The invol switch is a preemption */
686 /* Flags for setrunqueue(). Why are we setting this thread on the run queue? */
687 #define SRQ_BORING 0x0000 /* No special circumstances. */
688 #define SRQ_YIELDING 0x0001 /* We are yielding (from mi_switch). */
689 #define SRQ_OURSELF 0x0002 /* It is ourself (from mi_switch). */
690 #define SRQ_INTR 0x0004 /* It is probably urgent. */
691 #define SRQ_PREEMPTED 0x0008 /* has been preempted.. be kind */
693 /* How values for thread_single(). */
694 #define SINGLE_NO_EXIT 0
695 #define SINGLE_EXIT 1
696 #define SINGLE_BOUNDARY 2
698 /* XXXKSE: Missing values for thread_suspsend_check(). */
700 #ifdef MALLOC_DECLARE
701 MALLOC_DECLARE(M_PARGS);
702 MALLOC_DECLARE(M_PGRP);
703 MALLOC_DECLARE(M_SESSION);
704 MALLOC_DECLARE(M_SUBPROC);
705 MALLOC_DECLARE(M_ZOMBIE);
708 #define FOREACH_PROC_IN_SYSTEM(p) \
709 LIST_FOREACH((p), &allproc, p_list)
710 #define FOREACH_KSEGRP_IN_PROC(p, kg) \
711 TAILQ_FOREACH((kg), &(p)->p_ksegrps, kg_ksegrp)
712 #define FOREACH_THREAD_IN_GROUP(kg, td) \
713 TAILQ_FOREACH((td), &(kg)->kg_threads, td_kglist)
714 #define FOREACH_UPCALL_IN_GROUP(kg, ku) \
715 TAILQ_FOREACH((ku), &(kg)->kg_upcalls, ku_link)
716 #define FOREACH_THREAD_IN_PROC(p, td) \
717 TAILQ_FOREACH((td), &(p)->p_threads, td_plist)
719 /* XXXKSE the following lines should probably only be used in 1:1 code: */
720 #define FIRST_THREAD_IN_PROC(p) TAILQ_FIRST(&(p)->p_threads)
721 #define FIRST_KSEGRP_IN_PROC(p) TAILQ_FIRST(&(p)->p_ksegrps)
724 * We use process IDs <= PID_MAX; PID_MAX + 1 must also fit in a pid_t,
725 * as it is used to represent "no process group".
727 #define PID_MAX 99999
728 #define NO_PID 100000
730 #define SESS_LEADER(p) ((p)->p_session->s_leader == (p))
731 #define SESSHOLD(s) ((s)->s_count++)
732 #define SESSRELE(s) sessrele(s)
735 #define STOPEVENT(p, e, v) do { \
736 if ((p)->p_stops & (e)) { \
738 stopevent((p), (e), (v)); \
742 #define _STOPEVENT(p, e, v) do { \
743 PROC_LOCK_ASSERT(p, MA_OWNED); \
744 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, &p->p_mtx.mtx_object, \
745 "checking stopevent %d", (e)); \
746 if ((p)->p_stops & (e)) \
747 stopevent((p), (e), (v)); \
750 /* Lock and unlock a process. */
751 #define PROC_LOCK(p) mtx_lock(&(p)->p_mtx)
752 #define PROC_TRYLOCK(p) mtx_trylock(&(p)->p_mtx)
753 #define PROC_UNLOCK(p) mtx_unlock(&(p)->p_mtx)
754 #define PROC_LOCKED(p) mtx_owned(&(p)->p_mtx)
755 #define PROC_LOCK_ASSERT(p, type) mtx_assert(&(p)->p_mtx, (type))
757 /* Lock and unlock a process group. */
758 #define PGRP_LOCK(pg) mtx_lock(&(pg)->pg_mtx)
759 #define PGRP_UNLOCK(pg) mtx_unlock(&(pg)->pg_mtx)
760 #define PGRP_LOCKED(pg) mtx_owned(&(pg)->pg_mtx)
761 #define PGRP_LOCK_ASSERT(pg, type) mtx_assert(&(pg)->pg_mtx, (type))
763 #define PGRP_LOCK_PGSIGNAL(pg) do { \
767 #define PGRP_UNLOCK_PGSIGNAL(pg) do { \
772 /* Lock and unlock a session. */
773 #define SESS_LOCK(s) mtx_lock(&(s)->s_mtx)
774 #define SESS_UNLOCK(s) mtx_unlock(&(s)->s_mtx)
775 #define SESS_LOCKED(s) mtx_owned(&(s)->s_mtx)
776 #define SESS_LOCK_ASSERT(s, type) mtx_assert(&(s)->s_mtx, (type))
778 /* Hold process U-area in memory, normally for ptrace/procfs work. */
779 #define PHOLD(p) do { \
784 #define _PHOLD(p) do { \
785 PROC_LOCK_ASSERT((p), MA_OWNED); \
787 if (((p)->p_sflag & PS_INMEM) == 0) \
791 #define PRELE(p) do { \
796 #define _PRELE(p) do { \
797 PROC_LOCK_ASSERT((p), MA_OWNED); \
801 /* Check whether a thread is safe to be swapped out. */
802 #define thread_safetoswapout(td) (TD_IS_SLEEPING(td) || TD_IS_SUSPENDED(td))
804 /* Control whether or not it is safe for curthread to sleep. */
805 #define THREAD_NO_SLEEPING() do { \
806 KASSERT(!(curthread->td_pflags & TDP_NOSLEEPING), \
807 ("nested no sleeping")); \
808 curthread->td_pflags |= TDP_NOSLEEPING; \
811 #define THREAD_SLEEPING_OK() do { \
812 KASSERT((curthread->td_pflags & TDP_NOSLEEPING), \
813 ("nested sleeping ok")); \
814 curthread->td_pflags &= ~TDP_NOSLEEPING; \
817 #define PIDHASH(pid) (&pidhashtbl[(pid) & pidhash])
818 extern LIST_HEAD(pidhashhead, proc) *pidhashtbl;
819 extern u_long pidhash;
821 #define PGRPHASH(pgid) (&pgrphashtbl[(pgid) & pgrphash])
822 extern LIST_HEAD(pgrphashhead, pgrp) *pgrphashtbl;
823 extern u_long pgrphash;
825 extern struct sx allproc_lock;
826 extern struct sx proctree_lock;
827 extern struct mtx ppeers_lock;
828 extern struct ksegrp ksegrp0; /* Primary ksegrp in proc0. */
829 extern struct proc proc0; /* Process slot for swapper. */
830 extern struct thread thread0; /* Primary thread in proc0. */
831 extern struct vmspace vmspace0; /* VM space for proc0. */
832 extern int hogticks; /* Limit on kernel cpu hogs. */
834 extern int nprocs, maxproc; /* Current and max number of procs. */
835 extern int maxprocperuid; /* Max procs per uid. */
836 extern u_long ps_arg_cache_limit;
838 LIST_HEAD(proclist, proc);
839 TAILQ_HEAD(procqueue, proc);
840 TAILQ_HEAD(threadqueue, thread);
841 extern struct proclist allproc; /* List of all processes. */
842 extern struct proclist zombproc; /* List of zombie processes. */
843 extern struct proc *initproc, *pageproc; /* Process slots for init, pager. */
845 extern struct uma_zone *proc_zone;
847 struct proc *pfind(pid_t); /* Find process by id. */
848 struct pgrp *pgfind(pid_t); /* Find process group by id. */
849 struct proc *zpfind(pid_t); /* Find zombie process by id. */
851 void adjustrunqueue(struct thread *, int newpri);
852 void ast(struct trapframe *framep);
853 struct thread *choosethread(void);
854 int cr_cansignal(struct ucred *cred, struct proc *proc, int signum);
855 int enterpgrp(struct proc *p, pid_t pgid, struct pgrp *pgrp,
856 struct session *sess);
857 int enterthispgrp(struct proc *p, struct pgrp *pgrp);
858 void faultin(struct proc *p);
859 void fixjobc(struct proc *p, struct pgrp *pgrp, int entering);
860 int fork1(struct thread *, int, int, struct proc **);
861 void fork_exit(void (*)(void *, struct trapframe *), void *,
863 void fork_return(struct thread *, struct trapframe *);
864 int inferior(struct proc *p);
865 void kick_proc0(void);
866 int leavepgrp(struct proc *p);
867 int maybe_preempt(struct thread *td);
868 void mi_switch(int flags, struct thread *newtd);
869 int p_candebug(struct thread *td, struct proc *p);
870 int p_cansee(struct thread *td, struct proc *p);
871 int p_cansched(struct thread *td, struct proc *p);
872 int p_cansignal(struct thread *td, struct proc *p, int signum);
873 int p_canwait(struct thread *td, struct proc *p);
874 struct pargs *pargs_alloc(int len);
875 void pargs_drop(struct pargs *pa);
876 void pargs_free(struct pargs *pa);
877 void pargs_hold(struct pargs *pa);
879 void proc_linkup(struct proc *p, struct ksegrp *kg, struct thread *td);
880 void proc_reparent(struct proc *child, struct proc *newparent);
881 struct pstats *pstats_alloc(void);
882 void pstats_fork(struct pstats *src, struct pstats *dst);
883 void pstats_free(struct pstats *ps);
884 int securelevel_ge(struct ucred *cr, int level);
885 int securelevel_gt(struct ucred *cr, int level);
886 void sessrele(struct session *);
887 void setrunnable(struct thread *);
888 void setrunqueue(struct thread *, int flags);
889 void setsugid(struct proc *p);
890 int sigonstack(size_t sp);
891 void sleepinit(void);
892 void stopevent(struct proc *, u_int, u_int);
893 void threadinit(void);
895 extern void (*cpu_idle_hook)(void); /* Hook to machdep CPU idler. */
896 void cpu_switch(struct thread *old, struct thread *new);
897 void cpu_throw(struct thread *old, struct thread *new) __dead2;
898 void unsleep(struct thread *);
899 void userret(struct thread *, struct trapframe *, u_int);
901 void cpu_exit(struct thread *);
902 void exit1(struct thread *, int) __dead2;
903 void cpu_fork(struct thread *, struct proc *, struct thread *, int);
904 void cpu_set_fork_handler(struct thread *, void (*)(void *), void *);
907 struct ksegrp *ksegrp_alloc(void);
908 void ksegrp_free(struct ksegrp *kg);
909 void ksegrp_stash(struct ksegrp *kg);
912 void cpu_set_upcall(struct thread *td, struct thread *td0);
913 void cpu_set_upcall_kse(struct thread *, void (*)(void *), void *, stack_t *);
914 int cpu_set_user_tls(struct thread *, void *tls_base);
915 void cpu_thread_clean(struct thread *);
916 void cpu_thread_exit(struct thread *);
917 void cpu_thread_setup(struct thread *td);
918 void cpu_thread_swapin(struct thread *);
919 void cpu_thread_swapout(struct thread *);
920 void ksegrp_link(struct ksegrp *kg, struct proc *p);
921 void ksegrp_unlink(struct ksegrp *kg);
922 struct thread *thread_alloc(void);
923 void thread_continued(struct proc *p);
924 void thread_exit(void) __dead2;
925 int thread_export_context(struct thread *td, int willexit);
926 void thread_free(struct thread *td);
927 void thread_link(struct thread *td, struct ksegrp *kg);
928 void thread_reap(void);
929 struct thread *thread_schedule_upcall(struct thread *td, struct kse_upcall *ku);
930 void thread_signal_add(struct thread *td, ksiginfo_t *);
931 int thread_single(int how);
932 void thread_single_end(void);
933 int thread_sleep_check(struct thread *td);
934 void thread_stash(struct thread *td);
935 int thread_statclock(int user);
936 void thread_stopped(struct proc *p);
937 void childproc_stopped(struct proc *child, int reason);
938 void childproc_continued(struct proc *child);
939 void childproc_exited(struct proc *child);
940 int thread_suspend_check(int how);
941 void thread_suspend_one(struct thread *td);
942 struct thread *thread_switchout(struct thread *td, int flags,
943 struct thread *newtd);
944 void thread_unlink(struct thread *td);
945 void thread_unsuspend(struct proc *p);
946 void thread_unsuspend_one(struct thread *td);
947 void thread_unthread(struct thread *td);
948 int thread_userret(struct thread *td, struct trapframe *frame);
949 void thread_user_enter(struct thread *td);
950 void thread_wait(struct proc *p);
951 struct thread *thread_find(struct proc *p, lwpid_t tid);
952 void thr_exit1(void);
953 struct kse_upcall *upcall_alloc(void);
954 void upcall_free(struct kse_upcall *ku);
955 void upcall_link(struct kse_upcall *ku, struct ksegrp *kg);
956 void upcall_unlink(struct kse_upcall *ku);
957 void upcall_remove(struct thread *td);
958 void upcall_stash(struct kse_upcall *ke);
962 #endif /* !_SYS_PROC_H_ */