2 * Copyright (C) 2001 Julian Elischer <julian@freebsd.org>.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice(s), this list of conditions and the following disclaimer as
10 * the first lines of this file unmodified other than the possible
11 * addition of one or more copyright notices.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice(s), this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
20 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
23 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/kernel.h>
36 #include <sys/mutex.h>
38 #include <sys/resourcevar.h>
40 #include <sys/sysctl.h>
41 #include <sys/sched.h>
42 #include <sys/sleepqueue.h>
43 #include <sys/turnstile.h>
47 #include <security/audit/audit.h>
50 #include <vm/vm_extern.h>
54 * thread related storage.
56 static uma_zone_t thread_zone;
58 SYSCTL_NODE(_kern, OID_AUTO, threads, CTLFLAG_RW, 0, "thread allocation");
60 int max_threads_per_proc = 1500;
61 SYSCTL_INT(_kern_threads, OID_AUTO, max_threads_per_proc, CTLFLAG_RW,
62 &max_threads_per_proc, 0, "Limit on threads per proc");
65 SYSCTL_INT(_kern_threads, OID_AUTO, max_threads_hits, CTLFLAG_RD,
66 &max_threads_hits, 0, "");
72 TAILQ_HEAD(, thread) zombie_threads = TAILQ_HEAD_INITIALIZER(zombie_threads);
73 static struct mtx zombie_lock;
74 MTX_SYSINIT(zombie_lock, &zombie_lock, "zombie lock", MTX_SPIN);
76 static void thread_zombie(struct thread *);
80 sysctl_kse_virtual_cpu(SYSCTL_HANDLER_ARGS)
89 new_val = virtual_cpu;
90 error = sysctl_handle_int(oidp, &new_val, 0, req);
91 if (error != 0 || req->newptr == NULL)
95 virtual_cpu = new_val;
100 SYSCTL_PROC(_kern_threads, OID_AUTO, virtual_cpu, CTLTYPE_INT|CTLFLAG_RW,
101 0, sizeof(virtual_cpu), sysctl_kse_virtual_cpu, "I",
102 "debug virtual cpus");
106 static struct unrhdr *tid_unrhdr;
109 * Prepare a thread for use.
112 thread_ctor(void *mem, int size, void *arg, int flags)
116 td = (struct thread *)mem;
117 td->td_state = TDS_INACTIVE;
118 td->td_oncpu = NOCPU;
120 td->td_tid = alloc_unr(tid_unrhdr);
124 * Note that td_critnest begins life as 1 because the thread is not
125 * running and is thereby implicitly waiting to be on the receiving
126 * end of a context switch.
131 audit_thread_alloc(td);
133 umtx_thread_alloc(td);
138 * Reclaim a thread after use.
141 thread_dtor(void *mem, int size, void *arg)
145 td = (struct thread *)mem;
148 /* Verify that this thread is in a safe state to free. */
149 switch (td->td_state) {
155 * We must never unlink a thread that is in one of
156 * these states, because it is currently active.
158 panic("bad state for thread unlinking");
163 panic("bad thread state");
168 audit_thread_free(td);
170 free_unr(tid_unrhdr, td->td_tid);
175 * Initialize type-stable parts of a thread (when newly created).
178 thread_init(void *mem, int size, int flags)
182 td = (struct thread *)mem;
184 vm_thread_new(td, 0);
185 cpu_thread_setup(td);
186 td->td_sleepqueue = sleepq_alloc();
187 td->td_turnstile = turnstile_alloc();
188 td->td_sched = (struct td_sched *)&td[1];
190 umtx_thread_init(td);
195 * Tear down type-stable parts of a thread (just before being discarded).
198 thread_fini(void *mem, int size)
202 td = (struct thread *)mem;
203 turnstile_free(td->td_turnstile);
204 sleepq_free(td->td_sleepqueue);
205 umtx_thread_fini(td);
206 vm_thread_dispose(td);
210 * For a newly created process,
211 * link up all the structures and its initial threads etc.
213 * {arch}/{arch}/machdep.c ia64_init(), init386() etc.
214 * proc_dtor() (should go away)
218 proc_linkup(struct proc *p, struct thread *td)
221 TAILQ_INIT(&p->p_threads); /* all threads in proc */
223 TAILQ_INIT(&p->p_upcalls); /* upcall list */
225 sigqueue_init(&p->p_sigqueue, p);
226 p->p_ksi = ksiginfo_alloc(1);
227 if (p->p_ksi != NULL) {
228 /* XXX p_ksi may be null if ksiginfo zone is not ready */
229 p->p_ksi->ksi_flags = KSI_EXT | KSI_INS;
231 LIST_INIT(&p->p_mqnotifier);
237 * Initialize global thread allocation resources.
243 mtx_init(&tid_lock, "TID lock", NULL, MTX_DEF);
244 tid_unrhdr = new_unrhdr(PID_MAX + 1, INT_MAX, &tid_lock);
246 thread_zone = uma_zcreate("THREAD", sched_sizeof_thread(),
247 thread_ctor, thread_dtor, thread_init, thread_fini,
250 kseinit(); /* set up kse specific stuff e.g. upcall zone*/
255 * Place an unused thread on the zombie list.
256 * Use the slpq as that must be unused by now.
259 thread_zombie(struct thread *td)
261 mtx_lock_spin(&zombie_lock);
262 TAILQ_INSERT_HEAD(&zombie_threads, td, td_slpq);
263 mtx_unlock_spin(&zombie_lock);
267 * Release a thread that has exited after cpu_throw().
270 thread_stash(struct thread *td)
272 atomic_subtract_rel_int(&td->td_proc->p_exitthreads, 1);
277 * Reap zombie kse resource.
282 struct thread *td_first, *td_next;
285 * Don't even bother to lock if none at this instant,
286 * we really don't care about the next instant..
288 if (!TAILQ_EMPTY(&zombie_threads)) {
289 mtx_lock_spin(&zombie_lock);
290 td_first = TAILQ_FIRST(&zombie_threads);
292 TAILQ_INIT(&zombie_threads);
293 mtx_unlock_spin(&zombie_lock);
295 td_next = TAILQ_NEXT(td_first, td_slpq);
296 if (td_first->td_ucred)
297 crfree(td_first->td_ucred);
298 thread_free(td_first);
314 thread_reap(); /* check if any zombies to get */
315 return (uma_zalloc(thread_zone, M_WAITOK));
320 * Deallocate a thread.
323 thread_free(struct thread *td)
326 cpu_thread_clean(td);
327 uma_zfree(thread_zone, td);
331 * Discard the current thread and exit from its context.
332 * Always called with scheduler locked.
334 * Because we can't free a thread while we're operating under its context,
335 * push the current thread into our CPU's deadthread holder. This means
336 * we needn't worry about someone else grabbing our context before we
337 * do a cpu_throw(). This may not be needed now as we are under schedlock.
338 * Maybe we can just do a thread_stash() as thr_exit1 does.
341 * libthr expects its thread exit to return for the last
342 * thread, meaning that the program is back to non-threaded
343 * mode I guess. Because we do this (cpu_throw) unconditionally
344 * here, they have their own version of it. (thr_exit1())
345 * that doesn't do it all if this was the last thread.
346 * It is also called from thread_suspend_check().
347 * Of course in the end, they end up coming here through exit1
348 * anyhow.. After fixing 'thr' to play by the rules we should be able
349 * to merge these two functions together.
356 * thread_user_enter()
359 * thread_suspend_check()
364 uint64_t new_switchtime;
372 PROC_SLOCK_ASSERT(p, MA_OWNED);
373 mtx_assert(&Giant, MA_NOTOWNED);
375 PROC_LOCK_ASSERT(p, MA_OWNED);
376 KASSERT(p != NULL, ("thread exiting without a process"));
377 CTR3(KTR_PROC, "thread_exit: thread %p (pid %ld, %s)", td,
378 (long)p->p_pid, p->p_comm);
379 KASSERT(TAILQ_EMPTY(&td->td_sigqueue.sq_list), ("signal pending"));
382 AUDIT_SYSCALL_EXIT(0, td);
386 if (td->td_standin != NULL) {
388 * Note that we don't need to free the cred here as it
389 * is done in thread_reap().
391 thread_zombie(td->td_standin);
392 td->td_standin = NULL;
396 umtx_thread_exit(td);
399 * drop FPU & debug register state storage, or any other
400 * architecture specific resources that
401 * would not be on a new untouched process.
403 cpu_thread_exit(td); /* XXXSMP */
405 /* Do the same timestamp bookkeeping that mi_switch() would do. */
406 new_switchtime = cpu_ticks();
407 p->p_rux.rux_runtime += (new_switchtime - PCPU_GET(switchtime));
408 PCPU_SET(switchtime, new_switchtime);
409 PCPU_SET(switchticks, ticks);
410 PCPU_INC(cnt.v_swtch);
411 /* Save our resource usage in our process. */
412 td->td_ru.ru_nvcsw++;
413 rucollect(&p->p_ru, &td->td_ru);
415 * The last thread is left attached to the process
416 * So that the whole bundle gets recycled. Skip
417 * all this stuff if we never had threads.
418 * EXIT clears all sign of other threads when
419 * it goes to single threading, so the last thread always
420 * takes the short path.
422 if (p->p_flag & P_HADTHREADS) {
423 if (p->p_numthreads > 1) {
431 td2 = FIRST_THREAD_IN_PROC(p);
432 sched_exit_thread(td2, td);
435 * The test below is NOT true if we are the
436 * sole exiting thread. P_STOPPED_SNGL is unset
437 * in exit1() after it is the only survivor.
439 if (P_SHOULDSTOP(p) == P_STOPPED_SINGLE) {
440 if (p->p_numthreads == p->p_suspcount) {
441 thread_lock(p->p_singlethread);
442 thread_unsuspend_one(p->p_singlethread);
443 thread_unlock(p->p_singlethread);
447 atomic_add_int(&td->td_proc->p_exitthreads, 1);
448 PCPU_SET(deadthread, td);
451 * The last thread is exiting.. but not through exit()
453 * Theoretically this can't happen
454 * exit1() - clears threading flags before coming here
455 * kse_exit() - treats last thread specially
456 * thr_exit() - treats last thread specially
458 * thread_user_enter() - only if more exist
459 * thread_userret() - only if more exist
461 * thread_suspend_check() - only if more exist
463 panic ("thread_exit: Last thread exiting on its own");
468 /* Save our tick information with both the thread and proc locked */
469 ruxagg(&p->p_rux, td);
471 td->td_state = TDS_INACTIVE;
472 CTR1(KTR_PROC, "thread_exit: cpu_throw() thread %p", td);
474 panic("I'm a teapot!");
479 * Do any thread specific cleanups that may be needed in wait()
480 * called with Giant, proc and schedlock not held.
483 thread_wait(struct proc *p)
487 mtx_assert(&Giant, MA_NOTOWNED);
488 KASSERT((p->p_numthreads == 1), ("Multiple threads in wait1()"));
489 td = FIRST_THREAD_IN_PROC(p);
491 if (td->td_standin != NULL) {
492 if (td->td_standin->td_ucred != NULL) {
493 crfree(td->td_standin->td_ucred);
494 td->td_standin->td_ucred = NULL;
496 thread_free(td->td_standin);
497 td->td_standin = NULL;
500 /* Lock the last thread so we spin until it exits cpu_throw(). */
503 /* Wait for any remaining threads to exit cpu_throw(). */
504 while (p->p_exitthreads)
505 sched_relinquish(curthread);
506 cpu_thread_clean(td);
507 crfree(td->td_ucred);
508 thread_reap(); /* check for zombie threads etc. */
512 * Link a thread to a process.
513 * set up anything that needs to be initialized for it to
514 * be used by the process.
516 * Note that we do not link to the proc's ucred here.
517 * The thread is linked as if running but no KSE assigned.
520 * thread_schedule_upcall()
524 thread_link(struct thread *td, struct proc *p)
528 * XXX This can't be enabled because it's called for proc0 before
529 * it's spinlock has been created.
530 * PROC_SLOCK_ASSERT(p, MA_OWNED);
532 td->td_state = TDS_INACTIVE;
534 td->td_flags = TDF_INMEM;
536 LIST_INIT(&td->td_contested);
537 sigqueue_init(&td->td_sigqueue, p);
538 callout_init(&td->td_slpcallout, CALLOUT_MPSAFE);
539 TAILQ_INSERT_HEAD(&p->p_threads, td, td_plist);
544 * Convert a process with one thread to an unthreaded process.
546 * thread_single(exit) (called from execve and exit)
547 * kse_exit() XXX may need cleaning up wrt KSE stuff
550 thread_unthread(struct thread *td)
552 struct proc *p = td->td_proc;
554 KASSERT((p->p_numthreads == 1), ("Unthreading with >1 threads"));
559 p->p_flag &= ~(P_SA|P_HADTHREADS);
560 td->td_mailbox = NULL;
561 td->td_pflags &= ~(TDP_SA | TDP_CAN_UNBIND);
562 if (td->td_standin != NULL) {
563 thread_zombie(td->td_standin);
564 td->td_standin = NULL;
567 p->p_flag &= ~P_HADTHREADS;
576 thread_unlink(struct thread *td)
578 struct proc *p = td->td_proc;
580 PROC_SLOCK_ASSERT(p, MA_OWNED);
581 TAILQ_REMOVE(&p->p_threads, td, td_plist);
583 /* could clear a few other things here */
584 /* Must NOT clear links to proc! */
588 * Enforce single-threading.
590 * Returns 1 if the caller must abort (another thread is waiting to
591 * exit the process or similar). Process is locked!
592 * Returns 0 when you are successfully the only thread running.
593 * A process has successfully single threaded in the suspend mode when
594 * There are no threads in user mode. Threads in the kernel must be
595 * allowed to continue until they get to the user boundary. They may even
596 * copy out their return values and data before suspending. They may however be
597 * accelerated in reaching the user boundary as we will wake up
598 * any sleeping threads that are interruptable. (PCATCH).
601 thread_single(int mode)
610 mtx_assert(&Giant, MA_NOTOWNED);
611 PROC_LOCK_ASSERT(p, MA_OWNED);
612 KASSERT((td != NULL), ("curthread is NULL"));
614 if ((p->p_flag & P_HADTHREADS) == 0)
617 /* Is someone already single threading? */
618 if (p->p_singlethread != NULL && p->p_singlethread != td)
621 if (mode == SINGLE_EXIT) {
622 p->p_flag |= P_SINGLE_EXIT;
623 p->p_flag &= ~P_SINGLE_BOUNDARY;
625 p->p_flag &= ~P_SINGLE_EXIT;
626 if (mode == SINGLE_BOUNDARY)
627 p->p_flag |= P_SINGLE_BOUNDARY;
629 p->p_flag &= ~P_SINGLE_BOUNDARY;
631 p->p_flag |= P_STOPPED_SINGLE;
633 p->p_singlethread = td;
634 if (mode == SINGLE_EXIT)
635 remaining = p->p_numthreads;
636 else if (mode == SINGLE_BOUNDARY)
637 remaining = p->p_numthreads - p->p_boundary_count;
639 remaining = p->p_numthreads - p->p_suspcount;
640 while (remaining != 1) {
641 if (P_SHOULDSTOP(p) != P_STOPPED_SINGLE)
643 FOREACH_THREAD_IN_PROC(p, td2) {
647 td2->td_flags |= TDF_ASTPENDING;
648 if (TD_IS_INHIBITED(td2)) {
651 if (td->td_flags & TDF_DBSUSPEND)
652 td->td_flags &= ~TDF_DBSUSPEND;
653 if (TD_IS_SUSPENDED(td2))
654 thread_unsuspend_one(td2);
655 if (TD_ON_SLEEPQ(td2) &&
656 (td2->td_flags & TDF_SINTR))
657 sleepq_abort(td2, EINTR);
659 case SINGLE_BOUNDARY:
662 if (TD_IS_SUSPENDED(td2)) {
667 * maybe other inhibited states too?
669 if ((td2->td_flags & TDF_SINTR) &&
670 (td2->td_inhibitors &
671 (TDI_SLEEPING | TDI_SWAPPED)))
672 thread_suspend_one(td2);
677 else if (TD_IS_RUNNING(td2) && td != td2) {
683 if (mode == SINGLE_EXIT)
684 remaining = p->p_numthreads;
685 else if (mode == SINGLE_BOUNDARY)
686 remaining = p->p_numthreads - p->p_boundary_count;
688 remaining = p->p_numthreads - p->p_suspcount;
691 * Maybe we suspended some threads.. was it enough?
698 * Wake us up when everyone else has suspended.
699 * In the mean time we suspend as well.
701 thread_suspend_switch(td);
702 if (mode == SINGLE_EXIT)
703 remaining = p->p_numthreads;
704 else if (mode == SINGLE_BOUNDARY)
705 remaining = p->p_numthreads - p->p_boundary_count;
707 remaining = p->p_numthreads - p->p_suspcount;
709 if (mode == SINGLE_EXIT) {
711 * We have gotten rid of all the other threads and we
712 * are about to either exit or exec. In either case,
713 * we try our utmost to revert to being a non-threaded
716 p->p_singlethread = NULL;
717 p->p_flag &= ~(P_STOPPED_SINGLE | P_SINGLE_EXIT);
725 * Called in from locations that can safely check to see
726 * whether we have to suspend or at least throttle for a
727 * single-thread event (e.g. fork).
729 * Such locations include userret().
730 * If the "return_instead" argument is non zero, the thread must be able to
731 * accept 0 (caller may continue), or 1 (caller must abort) as a result.
733 * The 'return_instead' argument tells the function if it may do a
734 * thread_exit() or suspend, or whether the caller must abort and back
737 * If the thread that set the single_threading request has set the
738 * P_SINGLE_EXIT bit in the process flags then this call will never return
739 * if 'return_instead' is false, but will exit.
741 * P_SINGLE_EXIT | return_instead == 0| return_instead != 0
742 *---------------+--------------------+---------------------
743 * 0 | returns 0 | returns 0 or 1
744 * | when ST ends | immediatly
745 *---------------+--------------------+---------------------
746 * 1 | thread exits | returns 1
748 * 0 = thread_exit() or suspension ok,
749 * other = return error instead of stopping the thread.
751 * While a full suspension is under effect, even a single threading
752 * thread would be suspended if it made this call (but it shouldn't).
753 * This call should only be made from places where
754 * thread_exit() would be safe as that may be the outcome unless
755 * return_instead is set.
758 thread_suspend_check(int return_instead)
765 mtx_assert(&Giant, MA_NOTOWNED);
766 PROC_LOCK_ASSERT(p, MA_OWNED);
767 while (P_SHOULDSTOP(p) ||
768 ((p->p_flag & P_TRACED) && (td->td_flags & TDF_DBSUSPEND))) {
769 if (P_SHOULDSTOP(p) == P_STOPPED_SINGLE) {
770 KASSERT(p->p_singlethread != NULL,
771 ("singlethread not set"));
773 * The only suspension in action is a
774 * single-threading. Single threader need not stop.
775 * XXX Should be safe to access unlocked
776 * as it can only be set to be true by us.
778 if (p->p_singlethread == td)
779 return (0); /* Exempt from stopping. */
781 if ((p->p_flag & P_SINGLE_EXIT) && return_instead)
784 /* Should we goto user boundary if we didn't come from there? */
785 if (P_SHOULDSTOP(p) == P_STOPPED_SINGLE &&
786 (p->p_flag & P_SINGLE_BOUNDARY) && return_instead)
789 /* If thread will exit, flush its pending signals */
790 if ((p->p_flag & P_SINGLE_EXIT) && (p->p_singlethread != td))
791 sigqueue_flush(&td->td_sigqueue);
796 * If the process is waiting for us to exit,
797 * this thread should just suicide.
798 * Assumes that P_SINGLE_EXIT implies P_STOPPED_SINGLE.
800 if ((p->p_flag & P_SINGLE_EXIT) && (p->p_singlethread != td))
802 if (P_SHOULDSTOP(p) == P_STOPPED_SINGLE) {
803 if (p->p_numthreads == p->p_suspcount + 1) {
804 thread_lock(p->p_singlethread);
805 thread_unsuspend_one(p->p_singlethread);
806 thread_unlock(p->p_singlethread);
812 * When a thread suspends, it just
813 * gets taken off all queues.
815 thread_suspend_one(td);
816 if (return_instead == 0) {
817 p->p_boundary_count++;
818 td->td_flags |= TDF_BOUNDARY;
821 mi_switch(SW_INVOL, NULL);
822 if (return_instead == 0)
823 td->td_flags &= ~TDF_BOUNDARY;
826 if (return_instead == 0)
827 p->p_boundary_count--;
833 thread_suspend_switch(struct thread *td)
838 KASSERT(!TD_IS_SUSPENDED(td), ("already suspended"));
839 PROC_LOCK_ASSERT(p, MA_OWNED);
840 PROC_SLOCK_ASSERT(p, MA_OWNED);
842 * We implement thread_suspend_one in stages here to avoid
843 * dropping the proc lock while the thread lock is owned.
850 TD_SET_SUSPENDED(td);
853 mi_switch(SW_VOL, NULL);
861 thread_suspend_one(struct thread *td)
863 struct proc *p = td->td_proc;
865 PROC_SLOCK_ASSERT(p, MA_OWNED);
866 THREAD_LOCK_ASSERT(td, MA_OWNED);
867 KASSERT(!TD_IS_SUSPENDED(td), ("already suspended"));
870 TD_SET_SUSPENDED(td);
874 thread_unsuspend_one(struct thread *td)
876 struct proc *p = td->td_proc;
878 PROC_SLOCK_ASSERT(p, MA_OWNED);
879 THREAD_LOCK_ASSERT(td, MA_OWNED);
880 KASSERT(TD_IS_SUSPENDED(td), ("Thread not suspended"));
881 TD_CLR_SUSPENDED(td);
887 * Allow all threads blocked by single threading to continue running.
890 thread_unsuspend(struct proc *p)
894 PROC_LOCK_ASSERT(p, MA_OWNED);
895 PROC_SLOCK_ASSERT(p, MA_OWNED);
896 if (!P_SHOULDSTOP(p)) {
897 FOREACH_THREAD_IN_PROC(p, td) {
899 if (TD_IS_SUSPENDED(td)) {
900 thread_unsuspend_one(td);
904 } else if ((P_SHOULDSTOP(p) == P_STOPPED_SINGLE) &&
905 (p->p_numthreads == p->p_suspcount)) {
907 * Stopping everything also did the job for the single
908 * threading request. Now we've downgraded to single-threaded,
911 thread_lock(p->p_singlethread);
912 thread_unsuspend_one(p->p_singlethread);
913 thread_unlock(p->p_singlethread);
918 * End the single threading mode..
921 thread_single_end(void)
928 PROC_LOCK_ASSERT(p, MA_OWNED);
929 p->p_flag &= ~(P_STOPPED_SINGLE | P_SINGLE_EXIT | P_SINGLE_BOUNDARY);
931 p->p_singlethread = NULL;
933 * If there are other threads they mey now run,
934 * unless of course there is a blanket 'stop order'
935 * on the process. The single threader must be allowed
936 * to continue however as this is a bad place to stop.
938 if ((p->p_numthreads != 1) && (!P_SHOULDSTOP(p))) {
939 FOREACH_THREAD_IN_PROC(p, td) {
941 if (TD_IS_SUSPENDED(td)) {
942 thread_unsuspend_one(td);
951 thread_find(struct proc *p, lwpid_t tid)
955 PROC_LOCK_ASSERT(p, MA_OWNED);
957 FOREACH_THREAD_IN_PROC(p, td) {
958 if (td->td_tid == tid)