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  * Copyright (c) 2003, Jeffrey Roberson <jeff@freebsd.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice unmodified, this list of conditions, and the following
   10  *    disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/9.2/sys/kern/kern_thr.c 248085 2013-03-09 02:36:32Z marius $");
   29 
   30 #include "opt_compat.h"
   31 #include "opt_posix.h"
   32 #include <sys/param.h>
   33 #include <sys/kernel.h>
   34 #include <sys/lock.h>
   35 #include <sys/mutex.h>
   36 #include <sys/priv.h>
   37 #include <sys/proc.h>
   38 #include <sys/posix4.h>
   39 #include <sys/racct.h>
   40 #include <sys/resourcevar.h>
   41 #include <sys/rwlock.h>
   42 #include <sys/sched.h>
   43 #include <sys/sysctl.h>
   44 #include <sys/smp.h>
   45 #include <sys/syscallsubr.h>
   46 #include <sys/sysent.h>
   47 #include <sys/systm.h>
   48 #include <sys/sysproto.h>
   49 #include <sys/signalvar.h>
   50 #include <sys/sysctl.h>
   51 #include <sys/ucontext.h>
   52 #include <sys/thr.h>
   53 #include <sys/rtprio.h>
   54 #include <sys/umtx.h>
   55 #include <sys/limits.h>
   56 
   57 #include <machine/frame.h>
   58 
   59 #include <security/audit/audit.h>
   60 
   61 static SYSCTL_NODE(_kern, OID_AUTO, threads, CTLFLAG_RW, 0,
   62     "thread allocation");
   63 
   64 static int max_threads_per_proc = 1500;
   65 SYSCTL_INT(_kern_threads, OID_AUTO, max_threads_per_proc, CTLFLAG_RW,
   66         &max_threads_per_proc, 0, "Limit on threads per proc");
   67 
   68 static int max_threads_hits;
   69 SYSCTL_INT(_kern_threads, OID_AUTO, max_threads_hits, CTLFLAG_RD,
   70         &max_threads_hits, 0, "");
   71 
   72 #ifdef COMPAT_FREEBSD32
   73 
   74 static inline int
   75 suword_lwpid(void *addr, lwpid_t lwpid)
   76 {
   77         int error;
   78 
   79         if (SV_CURPROC_FLAG(SV_LP64))
   80                 error = suword(addr, lwpid);
   81         else
   82                 error = suword32(addr, lwpid);
   83         return (error);
   84 }
   85 
   86 #else
   87 #define suword_lwpid    suword
   88 #endif
   89 
   90 static int create_thread(struct thread *td, mcontext_t *ctx,
   91                          void (*start_func)(void *), void *arg,
   92                          char *stack_base, size_t stack_size,
   93                          char *tls_base,
   94                          long *child_tid, long *parent_tid,
   95                          int flags, struct rtprio *rtp);
   96 
   97 /*
   98  * System call interface.
   99  */
  100 int
  101 sys_thr_create(struct thread *td, struct thr_create_args *uap)
  102     /* ucontext_t *ctx, long *id, int flags */
  103 {
  104         ucontext_t ctx;
  105         int error;
  106 
  107         if ((error = copyin(uap->ctx, &ctx, sizeof(ctx))))
  108                 return (error);
  109 
  110         error = create_thread(td, &ctx.uc_mcontext, NULL, NULL,
  111                 NULL, 0, NULL, uap->id, NULL, uap->flags, NULL);
  112         return (error);
  113 }
  114 
  115 int
  116 sys_thr_new(struct thread *td, struct thr_new_args *uap)
  117     /* struct thr_param * */
  118 {
  119         struct thr_param param;
  120         int error;
  121 
  122         if (uap->param_size < 0 || uap->param_size > sizeof(param))
  123                 return (EINVAL);
  124         bzero(&param, sizeof(param));
  125         if ((error = copyin(uap->param, &param, uap->param_size)))
  126                 return (error);
  127         return (kern_thr_new(td, &param));
  128 }
  129 
  130 int
  131 kern_thr_new(struct thread *td, struct thr_param *param)
  132 {
  133         struct rtprio rtp, *rtpp;
  134         int error;
  135 
  136         rtpp = NULL;
  137         if (param->rtp != 0) {
  138                 error = copyin(param->rtp, &rtp, sizeof(struct rtprio));
  139                 if (error)
  140                         return (error);
  141                 rtpp = &rtp;
  142         }
  143         error = create_thread(td, NULL, param->start_func, param->arg,
  144                 param->stack_base, param->stack_size, param->tls_base,
  145                 param->child_tid, param->parent_tid, param->flags,
  146                 rtpp);
  147         return (error);
  148 }
  149 
  150 static int
  151 create_thread(struct thread *td, mcontext_t *ctx,
  152             void (*start_func)(void *), void *arg,
  153             char *stack_base, size_t stack_size,
  154             char *tls_base,
  155             long *child_tid, long *parent_tid,
  156             int flags, struct rtprio *rtp)
  157 {
  158         stack_t stack;
  159         struct thread *newtd;
  160         struct proc *p;
  161         int error;
  162 
  163         p = td->td_proc;
  164 
  165         /* Have race condition but it is cheap. */
  166         if (p->p_numthreads >= max_threads_per_proc) {
  167                 ++max_threads_hits;
  168                 return (EPROCLIM);
  169         }
  170 
  171         if (rtp != NULL) {
  172                 switch(rtp->type) {
  173                 case RTP_PRIO_REALTIME:
  174                 case RTP_PRIO_FIFO:
  175                         /* Only root can set scheduler policy */
  176                         if (priv_check(td, PRIV_SCHED_SETPOLICY) != 0)
  177                                 return (EPERM);
  178                         if (rtp->prio > RTP_PRIO_MAX)
  179                                 return (EINVAL);
  180                         break;
  181                 case RTP_PRIO_NORMAL:
  182                         rtp->prio = 0;
  183                         break;
  184                 default:
  185                         return (EINVAL);
  186                 }
  187         }
  188 
  189 #ifdef RACCT
  190         PROC_LOCK(td->td_proc);
  191         error = racct_add(p, RACCT_NTHR, 1);
  192         PROC_UNLOCK(td->td_proc);
  193         if (error != 0)
  194                 return (EPROCLIM);
  195 #endif
  196 
  197         /* Initialize our td */
  198         newtd = thread_alloc(0);
  199         if (newtd == NULL) {
  200                 error = ENOMEM;
  201                 goto fail;
  202         }
  203 
  204         cpu_set_upcall(newtd, td);
  205 
  206         /*
  207          * Try the copyout as soon as we allocate the td so we don't
  208          * have to tear things down in a failure case below.
  209          * Here we copy out tid to two places, one for child and one
  210          * for parent, because pthread can create a detached thread,
  211          * if parent wants to safely access child tid, it has to provide 
  212          * its storage, because child thread may exit quickly and
  213          * memory is freed before parent thread can access it.
  214          */
  215         if ((child_tid != NULL &&
  216             suword_lwpid(child_tid, newtd->td_tid)) ||
  217             (parent_tid != NULL &&
  218             suword_lwpid(parent_tid, newtd->td_tid))) {
  219                 thread_free(newtd);
  220                 error = EFAULT;
  221                 goto fail;
  222         }
  223 
  224         bzero(&newtd->td_startzero,
  225             __rangeof(struct thread, td_startzero, td_endzero));
  226         bcopy(&td->td_startcopy, &newtd->td_startcopy,
  227             __rangeof(struct thread, td_startcopy, td_endcopy));
  228         newtd->td_proc = td->td_proc;
  229         newtd->td_ucred = crhold(td->td_ucred);
  230 
  231         if (ctx != NULL) { /* old way to set user context */
  232                 error = set_mcontext(newtd, ctx);
  233                 if (error != 0) {
  234                         thread_free(newtd);
  235                         crfree(td->td_ucred);
  236                         goto fail;
  237                 }
  238         } else {
  239                 /* Set up our machine context. */
  240                 stack.ss_sp = stack_base;
  241                 stack.ss_size = stack_size;
  242                 /* Set upcall address to user thread entry function. */
  243                 cpu_set_upcall_kse(newtd, start_func, arg, &stack);
  244                 /* Setup user TLS address and TLS pointer register. */
  245                 error = cpu_set_user_tls(newtd, tls_base);
  246                 if (error != 0) {
  247                         thread_free(newtd);
  248                         crfree(td->td_ucred);
  249                         goto fail;
  250                 }
  251         }
  252 
  253         PROC_LOCK(td->td_proc);
  254         td->td_proc->p_flag |= P_HADTHREADS;
  255         newtd->td_sigmask = td->td_sigmask;
  256         thread_link(newtd, p); 
  257         bcopy(p->p_comm, newtd->td_name, sizeof(newtd->td_name));
  258         thread_lock(td);
  259         /* let the scheduler know about these things. */
  260         sched_fork_thread(td, newtd);
  261         thread_unlock(td);
  262         if (P_SHOULDSTOP(p))
  263                 newtd->td_flags |= TDF_ASTPENDING | TDF_NEEDSUSPCHK;
  264         PROC_UNLOCK(p);
  265 
  266         tidhash_add(newtd);
  267 
  268         thread_lock(newtd);
  269         if (rtp != NULL) {
  270                 if (!(td->td_pri_class == PRI_TIMESHARE &&
  271                       rtp->type == RTP_PRIO_NORMAL)) {
  272                         rtp_to_pri(rtp, newtd);
  273                         sched_prio(newtd, newtd->td_user_pri);
  274                 } /* ignore timesharing class */
  275         }
  276         TD_SET_CAN_RUN(newtd);
  277         sched_add(newtd, SRQ_BORING);
  278         thread_unlock(newtd);
  279 
  280         return (0);
  281 
  282 fail:
  283 #ifdef RACCT
  284         PROC_LOCK(p);
  285         racct_sub(p, RACCT_NTHR, 1);
  286         PROC_UNLOCK(p);
  287 #endif
  288         return (error);
  289 }
  290 
  291 int
  292 sys_thr_self(struct thread *td, struct thr_self_args *uap)
  293     /* long *id */
  294 {
  295         int error;
  296 
  297         error = suword_lwpid(uap->id, (unsigned)td->td_tid);
  298         if (error == -1)
  299                 return (EFAULT);
  300         return (0);
  301 }
  302 
  303 int
  304 sys_thr_exit(struct thread *td, struct thr_exit_args *uap)
  305     /* long *state */
  306 {
  307         struct proc *p;
  308 
  309         p = td->td_proc;
  310 
  311         /* Signal userland that it can free the stack. */
  312         if ((void *)uap->state != NULL) {
  313                 suword_lwpid(uap->state, 1);
  314                 kern_umtx_wake(td, uap->state, INT_MAX, 0);
  315         }
  316 
  317         rw_wlock(&tidhash_lock);
  318 
  319         PROC_LOCK(p);
  320 
  321         /*
  322          * Shutting down last thread in the proc.  This will actually
  323          * call exit() in the trampoline when it returns.
  324          */
  325         if (p->p_numthreads != 1) {
  326                 racct_sub(p, RACCT_NTHR, 1);
  327                 LIST_REMOVE(td, td_hash);
  328                 rw_wunlock(&tidhash_lock);
  329                 tdsigcleanup(td);
  330                 PROC_SLOCK(p);
  331                 thread_stopped(p);
  332                 thread_exit();
  333                 /* NOTREACHED */
  334         }
  335         PROC_UNLOCK(p);
  336         rw_wunlock(&tidhash_lock);
  337         return (0);
  338 }
  339 
  340 int
  341 sys_thr_kill(struct thread *td, struct thr_kill_args *uap)
  342     /* long id, int sig */
  343 {
  344         ksiginfo_t ksi;
  345         struct thread *ttd;
  346         struct proc *p;
  347         int error;
  348 
  349         p = td->td_proc;
  350         ksiginfo_init(&ksi);
  351         ksi.ksi_signo = uap->sig;
  352         ksi.ksi_code = SI_LWP;
  353         ksi.ksi_pid = p->p_pid;
  354         ksi.ksi_uid = td->td_ucred->cr_ruid;
  355         if (uap->id == -1) {
  356                 if (uap->sig != 0 && !_SIG_VALID(uap->sig)) {
  357                         error = EINVAL;
  358                 } else {
  359                         error = ESRCH;
  360                         PROC_LOCK(p);
  361                         FOREACH_THREAD_IN_PROC(p, ttd) {
  362                                 if (ttd != td) {
  363                                         error = 0;
  364                                         if (uap->sig == 0)
  365                                                 break;
  366                                         tdksignal(ttd, uap->sig, &ksi);
  367                                 }
  368                         }
  369                         PROC_UNLOCK(p);
  370                 }
  371         } else {
  372                 error = 0;
  373                 ttd = tdfind((lwpid_t)uap->id, p->p_pid);
  374                 if (ttd == NULL)
  375                         return (ESRCH);
  376                 if (uap->sig == 0)
  377                         ;
  378                 else if (!_SIG_VALID(uap->sig))
  379                         error = EINVAL;
  380                 else 
  381                         tdksignal(ttd, uap->sig, &ksi);
  382                 PROC_UNLOCK(ttd->td_proc);
  383         }
  384         return (error);
  385 }
  386 
  387 int
  388 sys_thr_kill2(struct thread *td, struct thr_kill2_args *uap)
  389     /* pid_t pid, long id, int sig */
  390 {
  391         ksiginfo_t ksi;
  392         struct thread *ttd;
  393         struct proc *p;
  394         int error;
  395 
  396         AUDIT_ARG_SIGNUM(uap->sig);
  397 
  398         ksiginfo_init(&ksi);
  399         ksi.ksi_signo = uap->sig;
  400         ksi.ksi_code = SI_LWP;
  401         ksi.ksi_pid = td->td_proc->p_pid;
  402         ksi.ksi_uid = td->td_ucred->cr_ruid;
  403         if (uap->id == -1) {
  404                 if ((p = pfind(uap->pid)) == NULL)
  405                         return (ESRCH);
  406                 AUDIT_ARG_PROCESS(p);
  407                 error = p_cansignal(td, p, uap->sig);
  408                 if (error) {
  409                         PROC_UNLOCK(p);
  410                         return (error);
  411                 }
  412                 if (uap->sig != 0 && !_SIG_VALID(uap->sig)) {
  413                         error = EINVAL;
  414                 } else {
  415                         error = ESRCH;
  416                         FOREACH_THREAD_IN_PROC(p, ttd) {
  417                                 if (ttd != td) {
  418                                         error = 0;
  419                                         if (uap->sig == 0)
  420                                                 break;
  421                                         tdksignal(ttd, uap->sig, &ksi);
  422                                 }
  423                         }
  424                 }
  425                 PROC_UNLOCK(p);
  426         } else {
  427                 ttd = tdfind((lwpid_t)uap->id, uap->pid);
  428                 if (ttd == NULL)
  429                         return (ESRCH);
  430                 p = ttd->td_proc;
  431                 AUDIT_ARG_PROCESS(p);
  432                 error = p_cansignal(td, p, uap->sig);
  433                 if (uap->sig == 0)
  434                         ;
  435                 else if (!_SIG_VALID(uap->sig))
  436                         error = EINVAL;
  437                 else
  438                         tdksignal(ttd, uap->sig, &ksi);
  439                 PROC_UNLOCK(p);
  440         }
  441         return (error);
  442 }
  443 
  444 int
  445 sys_thr_suspend(struct thread *td, struct thr_suspend_args *uap)
  446         /* const struct timespec *timeout */
  447 {
  448         struct timespec ts, *tsp;
  449         int error;
  450 
  451         tsp = NULL;
  452         if (uap->timeout != NULL) {
  453                 error = umtx_copyin_timeout(uap->timeout, &ts);
  454                 if (error != 0)
  455                         return (error);
  456                 tsp = &ts;
  457         }
  458 
  459         return (kern_thr_suspend(td, tsp));
  460 }
  461 
  462 int
  463 kern_thr_suspend(struct thread *td, struct timespec *tsp)
  464 {
  465         struct proc *p = td->td_proc;
  466         struct timeval tv;
  467         int error = 0;
  468         int timo = 0;
  469 
  470         if (td->td_pflags & TDP_WAKEUP) {
  471                 td->td_pflags &= ~TDP_WAKEUP;
  472                 return (0);
  473         }
  474 
  475         if (tsp != NULL) {
  476                 if (tsp->tv_sec == 0 && tsp->tv_nsec == 0)
  477                         error = EWOULDBLOCK;
  478                 else {
  479                         TIMESPEC_TO_TIMEVAL(&tv, tsp);
  480                         timo = tvtohz(&tv);
  481                 }
  482         }
  483 
  484         PROC_LOCK(p);
  485         if (error == 0 && (td->td_flags & TDF_THRWAKEUP) == 0)
  486                 error = msleep((void *)td, &p->p_mtx,
  487                          PCATCH, "lthr", timo);
  488 
  489         if (td->td_flags & TDF_THRWAKEUP) {
  490                 thread_lock(td);
  491                 td->td_flags &= ~TDF_THRWAKEUP;
  492                 thread_unlock(td);
  493                 PROC_UNLOCK(p);
  494                 return (0);
  495         }
  496         PROC_UNLOCK(p);
  497         if (error == EWOULDBLOCK)
  498                 error = ETIMEDOUT;
  499         else if (error == ERESTART) {
  500                 if (timo != 0)
  501                         error = EINTR;
  502         }
  503         return (error);
  504 }
  505 
  506 int
  507 sys_thr_wake(struct thread *td, struct thr_wake_args *uap)
  508         /* long id */
  509 {
  510         struct proc *p;
  511         struct thread *ttd;
  512 
  513         if (uap->id == td->td_tid) {
  514                 td->td_pflags |= TDP_WAKEUP;
  515                 return (0);
  516         } 
  517 
  518         p = td->td_proc;
  519         ttd = tdfind((lwpid_t)uap->id, p->p_pid);
  520         if (ttd == NULL)
  521                 return (ESRCH);
  522         thread_lock(ttd);
  523         ttd->td_flags |= TDF_THRWAKEUP;
  524         thread_unlock(ttd);
  525         wakeup((void *)ttd);
  526         PROC_UNLOCK(p);
  527         return (0);
  528 }
  529 
  530 int
  531 sys_thr_set_name(struct thread *td, struct thr_set_name_args *uap)
  532 {
  533         struct proc *p;
  534         char name[MAXCOMLEN + 1];
  535         struct thread *ttd;
  536         int error;
  537 
  538         error = 0;
  539         name[0] = '\0';
  540         if (uap->name != NULL) {
  541                 error = copyinstr(uap->name, name, sizeof(name),
  542                         NULL);
  543                 if (error)
  544                         return (error);
  545         }
  546         p = td->td_proc;
  547         ttd = tdfind((lwpid_t)uap->id, p->p_pid);
  548         if (ttd == NULL)
  549                 return (ESRCH);
  550         strcpy(ttd->td_name, name);
  551 #ifdef KTR
  552         sched_clear_tdname(ttd);
  553 #endif
  554         PROC_UNLOCK(p);
  555         return (error);
  556 }

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