The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_thr.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2003, Jeffrey Roberson <jeff@freebsd.org>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice unmodified, this list of conditions, and the following
   12  *    disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 #include "opt_posix.h"
   33 #include "opt_hwpmc_hooks.h"
   34 #include <sys/param.h>
   35 #include <sys/kernel.h>
   36 #include <sys/lock.h>
   37 #include <sys/mutex.h>
   38 #include <sys/priv.h>
   39 #include <sys/proc.h>
   40 #include <sys/posix4.h>
   41 #include <sys/ptrace.h>
   42 #include <sys/racct.h>
   43 #include <sys/resourcevar.h>
   44 #include <sys/rwlock.h>
   45 #include <sys/sched.h>
   46 #include <sys/sysctl.h>
   47 #include <sys/smp.h>
   48 #include <sys/syscallsubr.h>
   49 #include <sys/sysent.h>
   50 #include <sys/systm.h>
   51 #include <sys/sysproto.h>
   52 #include <sys/signalvar.h>
   53 #include <sys/sysctl.h>
   54 #include <sys/ucontext.h>
   55 #include <sys/thr.h>
   56 #include <sys/rtprio.h>
   57 #include <sys/umtx.h>
   58 #include <sys/limits.h>
   59 #ifdef  HWPMC_HOOKS
   60 #include <sys/pmckern.h>
   61 #endif
   62 
   63 #include <machine/frame.h>
   64 
   65 #include <security/audit/audit.h>
   66 
   67 static SYSCTL_NODE(_kern, OID_AUTO, threads, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
   68     "thread allocation");
   69 
   70 int max_threads_per_proc = 1500;
   71 SYSCTL_INT(_kern_threads, OID_AUTO, max_threads_per_proc, CTLFLAG_RW,
   72     &max_threads_per_proc, 0, "Limit on threads per proc");
   73 
   74 static int max_threads_hits;
   75 SYSCTL_INT(_kern_threads, OID_AUTO, max_threads_hits, CTLFLAG_RD,
   76     &max_threads_hits, 0, "kern.threads.max_threads_per_proc hit count");
   77 
   78 #ifdef COMPAT_FREEBSD32
   79 
   80 static inline int
   81 suword_lwpid(void *addr, lwpid_t lwpid)
   82 {
   83         int error;
   84 
   85         if (SV_CURPROC_FLAG(SV_LP64))
   86                 error = suword(addr, lwpid);
   87         else
   88                 error = suword32(addr, lwpid);
   89         return (error);
   90 }
   91 
   92 #else
   93 #define suword_lwpid    suword
   94 #endif
   95 
   96 /*
   97  * System call interface.
   98  */
   99 
  100 struct thr_create_initthr_args {
  101         ucontext_t ctx;
  102         long *tid;
  103 };
  104 
  105 static int
  106 thr_create_initthr(struct thread *td, void *thunk)
  107 {
  108         struct thr_create_initthr_args *args;
  109 
  110         /* Copy out the child tid. */
  111         args = thunk;
  112         if (args->tid != NULL && suword_lwpid(args->tid, td->td_tid))
  113                 return (EFAULT);
  114 
  115         return (set_mcontext(td, &args->ctx.uc_mcontext));
  116 }
  117 
  118 int
  119 sys_thr_create(struct thread *td, struct thr_create_args *uap)
  120     /* ucontext_t *ctx, long *id, int flags */
  121 {
  122         struct thr_create_initthr_args args;
  123         int error;
  124 
  125         if ((error = copyin(uap->ctx, &args.ctx, sizeof(args.ctx))))
  126                 return (error);
  127         args.tid = uap->id;
  128         return (thread_create(td, NULL, thr_create_initthr, &args));
  129 }
  130 
  131 int
  132 sys_thr_new(struct thread *td, struct thr_new_args *uap)
  133     /* struct thr_param * */
  134 {
  135         struct thr_param param;
  136         int error;
  137 
  138         if (uap->param_size < 0 || uap->param_size > sizeof(param))
  139                 return (EINVAL);
  140         bzero(&param, sizeof(param));
  141         if ((error = copyin(uap->param, &param, uap->param_size)))
  142                 return (error);
  143         return (kern_thr_new(td, &param));
  144 }
  145 
  146 static int
  147 thr_new_initthr(struct thread *td, void *thunk)
  148 {
  149         stack_t stack;
  150         struct thr_param *param;
  151 
  152         /*
  153          * Here we copy out tid to two places, one for child and one
  154          * for parent, because pthread can create a detached thread,
  155          * if parent wants to safely access child tid, it has to provide
  156          * its storage, because child thread may exit quickly and
  157          * memory is freed before parent thread can access it.
  158          */
  159         param = thunk;
  160         if ((param->child_tid != NULL &&
  161             suword_lwpid(param->child_tid, td->td_tid)) ||
  162             (param->parent_tid != NULL &&
  163             suword_lwpid(param->parent_tid, td->td_tid)))
  164                 return (EFAULT);
  165 
  166         /* Set up our machine context. */
  167         stack.ss_sp = param->stack_base;
  168         stack.ss_size = param->stack_size;
  169         /* Set upcall address to user thread entry function. */
  170         cpu_set_upcall(td, param->start_func, param->arg, &stack);
  171         /* Setup user TLS address and TLS pointer register. */
  172         return (cpu_set_user_tls(td, param->tls_base));
  173 }
  174 
  175 int
  176 kern_thr_new(struct thread *td, struct thr_param *param)
  177 {
  178         struct rtprio rtp, *rtpp;
  179         int error;
  180 
  181         rtpp = NULL;
  182         if (param->rtp != 0) {
  183                 error = copyin(param->rtp, &rtp, sizeof(struct rtprio));
  184                 if (error)
  185                         return (error);
  186                 rtpp = &rtp;
  187         }
  188         return (thread_create(td, rtpp, thr_new_initthr, param));
  189 }
  190 
  191 int
  192 thread_create(struct thread *td, struct rtprio *rtp,
  193     int (*initialize_thread)(struct thread *, void *), void *thunk)
  194 {
  195         struct thread *newtd;
  196         struct proc *p;
  197         int error;
  198 
  199         p = td->td_proc;
  200 
  201         if (rtp != NULL) {
  202                 switch(rtp->type) {
  203                 case RTP_PRIO_REALTIME:
  204                 case RTP_PRIO_FIFO:
  205                         /* Only root can set scheduler policy */
  206                         if (priv_check(td, PRIV_SCHED_SETPOLICY) != 0)
  207                                 return (EPERM);
  208                         if (rtp->prio > RTP_PRIO_MAX)
  209                                 return (EINVAL);
  210                         break;
  211                 case RTP_PRIO_NORMAL:
  212                         rtp->prio = 0;
  213                         break;
  214                 default:
  215                         return (EINVAL);
  216                 }
  217         }
  218 
  219 #ifdef RACCT
  220         if (racct_enable) {
  221                 PROC_LOCK(p);
  222                 error = racct_add(p, RACCT_NTHR, 1);
  223                 PROC_UNLOCK(p);
  224                 if (error != 0)
  225                         return (EPROCLIM);
  226         }
  227 #endif
  228 
  229         /* Initialize our td */
  230         error = kern_thr_alloc(p, 0, &newtd);
  231         if (error)
  232                 goto fail;
  233 
  234         cpu_copy_thread(newtd, td);
  235 
  236         bzero(&newtd->td_startzero,
  237             __rangeof(struct thread, td_startzero, td_endzero));
  238         bcopy(&td->td_startcopy, &newtd->td_startcopy,
  239             __rangeof(struct thread, td_startcopy, td_endcopy));
  240         newtd->td_proc = td->td_proc;
  241         newtd->td_rb_list = newtd->td_rbp_list = newtd->td_rb_inact = 0;
  242         thread_cow_get(newtd, td);
  243 
  244         error = initialize_thread(newtd, thunk);
  245         if (error != 0) {
  246                 thread_cow_free(newtd);
  247                 thread_free(newtd);
  248                 goto fail;
  249         }
  250 
  251         PROC_LOCK(p);
  252         p->p_flag |= P_HADTHREADS;
  253         thread_link(newtd, p);
  254         bcopy(p->p_comm, newtd->td_name, sizeof(newtd->td_name));
  255         thread_lock(td);
  256         /* let the scheduler know about these things. */
  257         sched_fork_thread(td, newtd);
  258         thread_unlock(td);
  259         if (P_SHOULDSTOP(p))
  260                 newtd->td_flags |= TDF_ASTPENDING | TDF_NEEDSUSPCHK;
  261         if (p->p_ptevents & PTRACE_LWP)
  262                 newtd->td_dbgflags |= TDB_BORN;
  263 
  264         PROC_UNLOCK(p);
  265 #ifdef  HWPMC_HOOKS
  266         if (PMC_PROC_IS_USING_PMCS(p))
  267                 PMC_CALL_HOOK(newtd, PMC_FN_THR_CREATE, NULL);
  268         else if (PMC_SYSTEM_SAMPLING_ACTIVE())
  269                 PMC_CALL_HOOK_UNLOCKED(newtd, PMC_FN_THR_CREATE_LOG, NULL);
  270 #endif
  271 
  272         tidhash_add(newtd);
  273 
  274         /* ignore timesharing class */
  275         if (rtp != NULL && !(td->td_pri_class == PRI_TIMESHARE &&
  276             rtp->type == RTP_PRIO_NORMAL))
  277                 rtp_to_pri(rtp, newtd);
  278 
  279         thread_lock(newtd);
  280         TD_SET_CAN_RUN(newtd);
  281         sched_add(newtd, SRQ_BORING);
  282 
  283         return (0);
  284 
  285 fail:
  286 #ifdef RACCT
  287         if (racct_enable) {
  288                 PROC_LOCK(p);
  289                 racct_sub(p, RACCT_NTHR, 1);
  290                 PROC_UNLOCK(p);
  291         }
  292 #endif
  293         return (error);
  294 }
  295 
  296 int
  297 sys_thr_self(struct thread *td, struct thr_self_args *uap)
  298     /* long *id */
  299 {
  300         int error;
  301 
  302         error = suword_lwpid(uap->id, (unsigned)td->td_tid);
  303         if (error == -1)
  304                 return (EFAULT);
  305         return (0);
  306 }
  307 
  308 int
  309 sys_thr_exit(struct thread *td, struct thr_exit_args *uap)
  310     /* long *state */
  311 {
  312 
  313         umtx_thread_exit(td);
  314 
  315         /* Signal userland that it can free the stack. */
  316         if ((void *)uap->state != NULL) {
  317                 suword_lwpid(uap->state, 1);
  318                 kern_umtx_wake(td, uap->state, INT_MAX, 0);
  319         }
  320 
  321         return (kern_thr_exit(td));
  322 }
  323 
  324 int
  325 kern_thr_exit(struct thread *td)
  326 {
  327         struct proc *p;
  328 
  329         p = td->td_proc;
  330 
  331         /*
  332          * If all of the threads in a process call this routine to
  333          * exit (e.g. all threads call pthread_exit()), exactly one
  334          * thread should return to the caller to terminate the process
  335          * instead of the thread.
  336          *
  337          * Checking p_numthreads alone is not sufficient since threads
  338          * might be committed to terminating while the PROC_LOCK is
  339          * dropped in either ptracestop() or while removing this thread
  340          * from the tidhash.  Instead, the p_pendingexits field holds
  341          * the count of threads in either of those states and a thread
  342          * is considered the "last" thread if all of the other threads
  343          * in a process are already terminating.
  344          */
  345         PROC_LOCK(p);
  346         if (p->p_numthreads == p->p_pendingexits + 1) {
  347                 /*
  348                  * Ignore attempts to shut down last thread in the
  349                  * proc.  This will actually call _exit(2) in the
  350                  * usermode trampoline when it returns.
  351                  */
  352                 PROC_UNLOCK(p);
  353                 return (0);
  354         }
  355 
  356         if (p->p_sysent->sv_ontdexit != NULL)
  357                 p->p_sysent->sv_ontdexit(td);
  358 
  359         td->td_dbgflags |= TDB_EXIT;
  360         if (p->p_ptevents & PTRACE_LWP) {
  361                 p->p_pendingexits++;
  362                 ptracestop(td, SIGTRAP, NULL);
  363                 p->p_pendingexits--;
  364         }
  365         tidhash_remove(td);
  366 
  367         /*
  368          * The check above should prevent all other threads from this
  369          * process from exiting while the PROC_LOCK is dropped, so
  370          * there must be at least one other thread other than the
  371          * current thread.
  372          */
  373         KASSERT(p->p_numthreads > 1, ("too few threads"));
  374         racct_sub(p, RACCT_NTHR, 1);
  375         tdsigcleanup(td);
  376 
  377 #ifdef AUDIT
  378         AUDIT_SYSCALL_EXIT(0, td);
  379 #endif
  380 
  381         PROC_SLOCK(p);
  382         thread_stopped(p);
  383         thread_exit();
  384         /* NOTREACHED */
  385 }
  386 
  387 int
  388 sys_thr_kill(struct thread *td, struct thr_kill_args *uap)
  389     /* long id, int sig */
  390 {
  391         ksiginfo_t ksi;
  392         struct thread *ttd;
  393         struct proc *p;
  394         int error;
  395 
  396         p = td->td_proc;
  397         ksiginfo_init(&ksi);
  398         ksi.ksi_signo = uap->sig;
  399         ksi.ksi_code = SI_LWP;
  400         ksi.ksi_pid = p->p_pid;
  401         ksi.ksi_uid = td->td_ucred->cr_ruid;
  402         if (uap->id == -1) {
  403                 if (uap->sig != 0 && !_SIG_VALID(uap->sig)) {
  404                         error = EINVAL;
  405                 } else {
  406                         error = ESRCH;
  407                         PROC_LOCK(p);
  408                         FOREACH_THREAD_IN_PROC(p, ttd) {
  409                                 if (ttd != td) {
  410                                         error = 0;
  411                                         if (uap->sig == 0)
  412                                                 break;
  413                                         tdksignal(ttd, uap->sig, &ksi);
  414                                 }
  415                         }
  416                         PROC_UNLOCK(p);
  417                 }
  418         } else {
  419                 error = 0;
  420                 ttd = tdfind((lwpid_t)uap->id, p->p_pid);
  421                 if (ttd == NULL)
  422                         return (ESRCH);
  423                 if (uap->sig == 0)
  424                         ;
  425                 else if (!_SIG_VALID(uap->sig))
  426                         error = EINVAL;
  427                 else 
  428                         tdksignal(ttd, uap->sig, &ksi);
  429                 PROC_UNLOCK(ttd->td_proc);
  430         }
  431         return (error);
  432 }
  433 
  434 int
  435 sys_thr_kill2(struct thread *td, struct thr_kill2_args *uap)
  436     /* pid_t pid, long id, int sig */
  437 {
  438         ksiginfo_t ksi;
  439         struct thread *ttd;
  440         struct proc *p;
  441         int error;
  442 
  443         AUDIT_ARG_SIGNUM(uap->sig);
  444 
  445         ksiginfo_init(&ksi);
  446         ksi.ksi_signo = uap->sig;
  447         ksi.ksi_code = SI_LWP;
  448         ksi.ksi_pid = td->td_proc->p_pid;
  449         ksi.ksi_uid = td->td_ucred->cr_ruid;
  450         if (uap->id == -1) {
  451                 if ((p = pfind(uap->pid)) == NULL)
  452                         return (ESRCH);
  453                 AUDIT_ARG_PROCESS(p);
  454                 error = p_cansignal(td, p, uap->sig);
  455                 if (error) {
  456                         PROC_UNLOCK(p);
  457                         return (error);
  458                 }
  459                 if (uap->sig != 0 && !_SIG_VALID(uap->sig)) {
  460                         error = EINVAL;
  461                 } else {
  462                         error = ESRCH;
  463                         FOREACH_THREAD_IN_PROC(p, ttd) {
  464                                 if (ttd != td) {
  465                                         error = 0;
  466                                         if (uap->sig == 0)
  467                                                 break;
  468                                         tdksignal(ttd, uap->sig, &ksi);
  469                                 }
  470                         }
  471                 }
  472                 PROC_UNLOCK(p);
  473         } else {
  474                 ttd = tdfind((lwpid_t)uap->id, uap->pid);
  475                 if (ttd == NULL)
  476                         return (ESRCH);
  477                 p = ttd->td_proc;
  478                 AUDIT_ARG_PROCESS(p);
  479                 error = p_cansignal(td, p, uap->sig);
  480                 if (uap->sig == 0)
  481                         ;
  482                 else if (!_SIG_VALID(uap->sig))
  483                         error = EINVAL;
  484                 else
  485                         tdksignal(ttd, uap->sig, &ksi);
  486                 PROC_UNLOCK(p);
  487         }
  488         return (error);
  489 }
  490 
  491 int
  492 sys_thr_suspend(struct thread *td, struct thr_suspend_args *uap)
  493         /* const struct timespec *timeout */
  494 {
  495         struct timespec ts, *tsp;
  496         int error;
  497 
  498         tsp = NULL;
  499         if (uap->timeout != NULL) {
  500                 error = umtx_copyin_timeout(uap->timeout, &ts);
  501                 if (error != 0)
  502                         return (error);
  503                 tsp = &ts;
  504         }
  505 
  506         return (kern_thr_suspend(td, tsp));
  507 }
  508 
  509 int
  510 kern_thr_suspend(struct thread *td, struct timespec *tsp)
  511 {
  512         struct proc *p = td->td_proc;
  513         struct timeval tv;
  514         int error = 0;
  515         int timo = 0;
  516 
  517         if (td->td_pflags & TDP_WAKEUP) {
  518                 td->td_pflags &= ~TDP_WAKEUP;
  519                 return (0);
  520         }
  521 
  522         if (tsp != NULL) {
  523                 if (tsp->tv_sec == 0 && tsp->tv_nsec == 0)
  524                         error = EWOULDBLOCK;
  525                 else {
  526                         TIMESPEC_TO_TIMEVAL(&tv, tsp);
  527                         timo = tvtohz(&tv);
  528                 }
  529         }
  530 
  531         PROC_LOCK(p);
  532         if (error == 0 && (td->td_flags & TDF_THRWAKEUP) == 0)
  533                 error = msleep((void *)td, &p->p_mtx,
  534                          PCATCH, "lthr", timo);
  535 
  536         if (td->td_flags & TDF_THRWAKEUP) {
  537                 thread_lock(td);
  538                 td->td_flags &= ~TDF_THRWAKEUP;
  539                 thread_unlock(td);
  540                 PROC_UNLOCK(p);
  541                 return (0);
  542         }
  543         PROC_UNLOCK(p);
  544         if (error == EWOULDBLOCK)
  545                 error = ETIMEDOUT;
  546         else if (error == ERESTART) {
  547                 if (timo != 0)
  548                         error = EINTR;
  549         }
  550         return (error);
  551 }
  552 
  553 int
  554 sys_thr_wake(struct thread *td, struct thr_wake_args *uap)
  555         /* long id */
  556 {
  557         struct proc *p;
  558         struct thread *ttd;
  559 
  560         if (uap->id == td->td_tid) {
  561                 td->td_pflags |= TDP_WAKEUP;
  562                 return (0);
  563         } 
  564 
  565         p = td->td_proc;
  566         ttd = tdfind((lwpid_t)uap->id, p->p_pid);
  567         if (ttd == NULL)
  568                 return (ESRCH);
  569         thread_lock(ttd);
  570         ttd->td_flags |= TDF_THRWAKEUP;
  571         thread_unlock(ttd);
  572         wakeup((void *)ttd);
  573         PROC_UNLOCK(p);
  574         return (0);
  575 }
  576 
  577 int
  578 sys_thr_set_name(struct thread *td, struct thr_set_name_args *uap)
  579 {
  580         struct proc *p;
  581         char name[MAXCOMLEN + 1];
  582         struct thread *ttd;
  583         int error;
  584 
  585         error = 0;
  586         name[0] = '\0';
  587         if (uap->name != NULL) {
  588                 error = copyinstr(uap->name, name, sizeof(name), NULL);
  589                 if (error == ENAMETOOLONG) {
  590                         error = copyin(uap->name, name, sizeof(name) - 1);
  591                         name[sizeof(name) - 1] = '\0';
  592                 }
  593                 if (error)
  594                         return (error);
  595         }
  596         p = td->td_proc;
  597         ttd = tdfind((lwpid_t)uap->id, p->p_pid);
  598         if (ttd == NULL)
  599                 return (ESRCH);
  600         strcpy(ttd->td_name, name);
  601 #ifdef HWPMC_HOOKS
  602         if (PMC_PROC_IS_USING_PMCS(p) || PMC_SYSTEM_SAMPLING_ACTIVE())
  603                 PMC_CALL_HOOK_UNLOCKED(ttd, PMC_FN_THR_CREATE_LOG, NULL);
  604 #endif
  605 #ifdef KTR
  606         sched_clear_tdname(ttd);
  607 #endif
  608         PROC_UNLOCK(p);
  609         return (error);
  610 }
  611 
  612 int
  613 kern_thr_alloc(struct proc *p, int pages, struct thread **ntd)
  614 {
  615 
  616         /* Have race condition but it is cheap. */
  617         if (p->p_numthreads >= max_threads_per_proc) {
  618                 ++max_threads_hits;
  619                 return (EPROCLIM);
  620         }
  621 
  622         *ntd = thread_alloc(pages);
  623         if (*ntd == NULL)
  624                 return (ENOMEM);
  625 
  626         return (0);
  627 }

Cache object: 25c61eef5a26f6b4af204ebfdf019d6e


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