kern_thr.c

Version: - FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
    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/8.0/sys/kern/kern_thr.c 196977 2009-09-08 15:31:23Z kib $");
   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/resourcevar.h>
   40 #include <sys/sched.h>
   41 #include <sys/sysctl.h>
   42 #include <sys/smp.h>
   43 #include <sys/syscallsubr.h>
   44 #include <sys/sysent.h>
   45 #include <sys/systm.h>
   46 #include <sys/sysproto.h>
   47 #include <sys/signalvar.h>
   48 #include <sys/ucontext.h>
   49 #include <sys/thr.h>
   50 #include <sys/rtprio.h>
   51 #include <sys/umtx.h>
   52 #include <sys/limits.h>
   53 
   54 #include <machine/frame.h>
   55 
   56 #include <security/audit/audit.h>
   57 
   58 #ifdef COMPAT_IA32
   59 
   60 static inline int
   61 suword_lwpid(void *addr, lwpid_t lwpid)
   62 {
   63         int error;
   64 
   65         if (SV_CURPROC_FLAG(SV_LP64))
   66                 error = suword(addr, lwpid);
   67         else
   68                 error = suword32(addr, lwpid);
   69         return (error);
   70 }
   71 
   72 #else
   73 #define suword_lwpid    suword
   74 #endif
   75 
   76 extern int max_threads_per_proc;
   77 extern int max_threads_hits;
   78 
   79 static int create_thread(struct thread *td, mcontext_t *ctx,
   80                          void (*start_func)(void *), void *arg,
   81                          char *stack_base, size_t stack_size,
   82                          char *tls_base,
   83                          long *child_tid, long *parent_tid,
   84                          int flags, struct rtprio *rtp);
   85 
   86 /*
   87  * System call interface.
   88  */
   89 int
   90 thr_create(struct thread *td, struct thr_create_args *uap)
   91     /* ucontext_t *ctx, long *id, int flags */
   92 {
   93         ucontext_t ctx;
   94         int error;
   95 
   96         if ((error = copyin(uap->ctx, &ctx, sizeof(ctx))))
   97                 return (error);
   98 
   99         error = create_thread(td, &ctx.uc_mcontext, NULL, NULL,
  100                 NULL, 0, NULL, uap->id, NULL, uap->flags, NULL);
  101         return (error);
  102 }
  103 
  104 int
  105 thr_new(struct thread *td, struct thr_new_args *uap)
  106     /* struct thr_param * */
  107 {
  108         struct thr_param param;
  109         int error;
  110 
  111         if (uap->param_size < 0 || uap->param_size > sizeof(param))
  112                 return (EINVAL);
  113         bzero(&param, sizeof(param));
  114         if ((error = copyin(uap->param, &param, uap->param_size)))
  115                 return (error);
  116         return (kern_thr_new(td, &param));
  117 }
  118 
  119 int
  120 kern_thr_new(struct thread *td, struct thr_param *param)
  121 {
  122         struct rtprio rtp, *rtpp;
  123         int error;
  124 
  125         rtpp = NULL;
  126         if (param->rtp != 0) {
  127                 error = copyin(param->rtp, &rtp, sizeof(struct rtprio));
  128                 if (error)
  129                         return (error);
  130                 rtpp = &rtp;
  131         }
  132         error = create_thread(td, NULL, param->start_func, param->arg,
  133                 param->stack_base, param->stack_size, param->tls_base,
  134                 param->child_tid, param->parent_tid, param->flags,
  135                 rtpp);
  136         return (error);
  137 }
  138 
  139 static int
  140 create_thread(struct thread *td, mcontext_t *ctx,
  141             void (*start_func)(void *), void *arg,
  142             char *stack_base, size_t stack_size,
  143             char *tls_base,
  144             long *child_tid, long *parent_tid,
  145             int flags, struct rtprio *rtp)
  146 {
  147         stack_t stack;
  148         struct thread *newtd;
  149         struct proc *p;
  150         int error;
  151 
  152         p = td->td_proc;
  153 
  154         /* Have race condition but it is cheap. */
  155         if (p->p_numthreads >= max_threads_per_proc) {
  156                 ++max_threads_hits;
  157                 return (EPROCLIM);
  158         }
  159 
  160         if (rtp != NULL) {
  161                 switch(rtp->type) {
  162                 case RTP_PRIO_REALTIME:
  163                 case RTP_PRIO_FIFO:
  164                         /* Only root can set scheduler policy */
  165                         if (priv_check(td, PRIV_SCHED_SETPOLICY) != 0)
  166                                 return (EPERM);
  167                         if (rtp->prio > RTP_PRIO_MAX)
  168                                 return (EINVAL);
  169                         break;
  170                 case RTP_PRIO_NORMAL:
  171                         rtp->prio = 0;
  172                         break;
  173                 default:
  174                         return (EINVAL);
  175                 }
  176         }
  177 
  178         /* Initialize our td */
  179         newtd = thread_alloc(0);
  180         if (newtd == NULL)
  181                 return (ENOMEM);
  182 
  183         /*
  184          * Try the copyout as soon as we allocate the td so we don't
  185          * have to tear things down in a failure case below.
  186          * Here we copy out tid to two places, one for child and one
  187          * for parent, because pthread can create a detached thread,
  188          * if parent wants to safely access child tid, it has to provide 
  189          * its storage, because child thread may exit quickly and
  190          * memory is freed before parent thread can access it.
  191          */
  192         if ((child_tid != NULL &&
  193             suword_lwpid(child_tid, newtd->td_tid)) ||
  194             (parent_tid != NULL &&
  195             suword_lwpid(parent_tid, newtd->td_tid))) {
  196                 thread_free(newtd);
  197                 return (EFAULT);
  198         }
  199 
  200         bzero(&newtd->td_startzero,
  201             __rangeof(struct thread, td_startzero, td_endzero));
  202         bcopy(&td->td_startcopy, &newtd->td_startcopy,
  203             __rangeof(struct thread, td_startcopy, td_endcopy));
  204         newtd->td_proc = td->td_proc;
  205         newtd->td_ucred = crhold(td->td_ucred);
  206 
  207         cpu_set_upcall(newtd, td);
  208 
  209         if (ctx != NULL) { /* old way to set user context */
  210                 error = set_mcontext(newtd, ctx);
  211                 if (error != 0) {
  212                         thread_free(newtd);
  213                         crfree(td->td_ucred);
  214                         return (error);
  215                 }
  216         } else {
  217                 /* Set up our machine context. */
  218                 stack.ss_sp = stack_base;
  219                 stack.ss_size = stack_size;
  220                 /* Set upcall address to user thread entry function. */
  221                 cpu_set_upcall_kse(newtd, start_func, arg, &stack);
  222                 /* Setup user TLS address and TLS pointer register. */
  223                 error = cpu_set_user_tls(newtd, tls_base);
  224                 if (error != 0) {
  225                         thread_free(newtd);
  226                         crfree(td->td_ucred);
  227                         return (error);
  228                 }
  229         }
  230 
  231         PROC_LOCK(td->td_proc);
  232         td->td_proc->p_flag |= P_HADTHREADS;
  233         newtd->td_sigmask = td->td_sigmask;
  234         thread_link(newtd, p); 
  235         bcopy(p->p_comm, newtd->td_name, sizeof(newtd->td_name));
  236         thread_lock(td);
  237         /* let the scheduler know about these things. */
  238         sched_fork_thread(td, newtd);
  239         thread_unlock(td);
  240         if (P_SHOULDSTOP(p))
  241                 newtd->td_flags |= TDF_ASTPENDING | TDF_NEEDSUSPCHK;
  242         PROC_UNLOCK(p);
  243         thread_lock(newtd);
  244         if (rtp != NULL) {
  245                 if (!(td->td_pri_class == PRI_TIMESHARE &&
  246                       rtp->type == RTP_PRIO_NORMAL)) {
  247                         rtp_to_pri(rtp, newtd);
  248                         sched_prio(newtd, newtd->td_user_pri);
  249                 } /* ignore timesharing class */
  250         }
  251         TD_SET_CAN_RUN(newtd);
  252         sched_add(newtd, SRQ_BORING);
  253         thread_unlock(newtd);
  254 
  255         return (0);
  256 }
  257 
  258 int
  259 thr_self(struct thread *td, struct thr_self_args *uap)
  260     /* long *id */
  261 {
  262         int error;
  263 
  264         error = suword_lwpid(uap->id, (unsigned)td->td_tid);
  265         if (error == -1)
  266                 return (EFAULT);
  267         return (0);
  268 }
  269 
  270 int
  271 thr_exit(struct thread *td, struct thr_exit_args *uap)
  272     /* long *state */
  273 {
  274         struct proc *p;
  275 
  276         p = td->td_proc;
  277 
  278         /* Signal userland that it can free the stack. */
  279         if ((void *)uap->state != NULL) {
  280                 suword_lwpid(uap->state, 1);
  281                 kern_umtx_wake(td, uap->state, INT_MAX, 0);
  282         }
  283 
  284         PROC_LOCK(p);
  285         sigqueue_flush(&td->td_sigqueue);
  286         PROC_SLOCK(p);
  287 
  288         /*
  289          * Shutting down last thread in the proc.  This will actually
  290          * call exit() in the trampoline when it returns.
  291          */
  292         if (p->p_numthreads != 1) {
  293                 thread_stopped(p);
  294                 thread_exit();
  295                 /* NOTREACHED */
  296         }
  297         PROC_SUNLOCK(p);
  298         PROC_UNLOCK(p);
  299         return (0);
  300 }
  301 
  302 int
  303 thr_kill(struct thread *td, struct thr_kill_args *uap)
  304     /* long id, int sig */
  305 {
  306         struct thread *ttd;
  307         struct proc *p;
  308         int error;
  309 
  310         p = td->td_proc;
  311         error = 0;
  312         PROC_LOCK(p);
  313         if (uap->id == -1) {
  314                 if (uap->sig != 0 && !_SIG_VALID(uap->sig)) {
  315                         error = EINVAL;
  316                 } else {
  317                         error = ESRCH;
  318                         FOREACH_THREAD_IN_PROC(p, ttd) {
  319                                 if (ttd != td) {
  320                                         error = 0;
  321                                         if (uap->sig == 0)
  322                                                 break;
  323                                         tdsignal(p, ttd, uap->sig, NULL);
  324                                 }
  325                         }
  326                 }
  327         } else {
  328                 if (uap->id != td->td_tid)
  329                         ttd = thread_find(p, uap->id);
  330                 else
  331                         ttd = td;
  332                 if (ttd == NULL)
  333                         error = ESRCH;
  334                 else if (uap->sig == 0)
  335                         ;
  336                 else if (!_SIG_VALID(uap->sig))
  337                         error = EINVAL;
  338                 else
  339                         tdsignal(p, ttd, uap->sig, NULL);
  340         }
  341         PROC_UNLOCK(p);
  342         return (error);
  343 }
  344 
  345 int
  346 thr_kill2(struct thread *td, struct thr_kill2_args *uap)
  347     /* pid_t pid, long id, int sig */
  348 {
  349         struct thread *ttd;
  350         struct proc *p;
  351         int error;
  352 
  353         AUDIT_ARG_SIGNUM(uap->sig);
  354 
  355         if (uap->pid == td->td_proc->p_pid) {
  356                 p = td->td_proc;
  357                 PROC_LOCK(p);
  358         } else if ((p = pfind(uap->pid)) == NULL) {
  359                 return (ESRCH);
  360         }
  361         AUDIT_ARG_PROCESS(p);
  362 
  363         error = p_cansignal(td, p, uap->sig);
  364         if (error == 0) {
  365                 if (uap->id == -1) {
  366                         if (uap->sig != 0 && !_SIG_VALID(uap->sig)) {
  367                                 error = EINVAL;
  368                         } else {
  369                                 error = ESRCH;
  370                                 FOREACH_THREAD_IN_PROC(p, ttd) {
  371                                         if (ttd != td) {
  372                                                 error = 0;
  373                                                 if (uap->sig == 0)
  374                                                         break;
  375                                                 tdsignal(p, ttd, uap->sig, NULL);
  376                                         }
  377                                 }
  378                         }
  379                 } else {
  380                         if (uap->id != td->td_tid)
  381                                 ttd = thread_find(p, uap->id);
  382                         else
  383                                 ttd = td;
  384                         if (ttd == NULL)
  385                                 error = ESRCH;
  386                         else if (uap->sig == 0)
  387                                 ;
  388                         else if (!_SIG_VALID(uap->sig))
  389                                 error = EINVAL;
  390                         else
  391                                 tdsignal(p, ttd, uap->sig, NULL);
  392                 }
  393         }
  394         PROC_UNLOCK(p);
  395         return (error);
  396 }
  397 
  398 int
  399 thr_suspend(struct thread *td, struct thr_suspend_args *uap)
  400         /* const struct timespec *timeout */
  401 {
  402         struct timespec ts, *tsp;
  403         int error;
  404 
  405         tsp = NULL;
  406         if (uap->timeout != NULL) {
  407                 error = copyin((const void *)uap->timeout, (void *)&ts,
  408                     sizeof(struct timespec));
  409                 if (error != 0)
  410                         return (error);
  411                 tsp = &ts;
  412         }
  413 
  414         return (kern_thr_suspend(td, tsp));
  415 }
  416 
  417 int
  418 kern_thr_suspend(struct thread *td, struct timespec *tsp)
  419 {
  420         struct timeval tv;
  421         int error = 0, hz = 0;
  422 
  423         if (tsp != NULL) {
  424                 if (tsp->tv_nsec < 0 || tsp->tv_nsec > 1000000000)
  425                         return (EINVAL);
  426                 if (tsp->tv_sec == 0 && tsp->tv_nsec == 0)
  427                         return (ETIMEDOUT);
  428                 TIMESPEC_TO_TIMEVAL(&tv, tsp);
  429                 hz = tvtohz(&tv);
  430         }
  431 
  432         if (td->td_pflags & TDP_WAKEUP) {
  433                 td->td_pflags &= ~TDP_WAKEUP;
  434                 return (0);
  435         }
  436 
  437         PROC_LOCK(td->td_proc);
  438         if ((td->td_flags & TDF_THRWAKEUP) == 0)
  439                 error = msleep((void *)td, &td->td_proc->p_mtx, PCATCH, "lthr",
  440                     hz);
  441         if (td->td_flags & TDF_THRWAKEUP) {
  442                 thread_lock(td);
  443                 td->td_flags &= ~TDF_THRWAKEUP;
  444                 thread_unlock(td);
  445                 PROC_UNLOCK(td->td_proc);
  446                 return (0);
  447         }
  448         PROC_UNLOCK(td->td_proc);
  449         if (error == EWOULDBLOCK)
  450                 error = ETIMEDOUT;
  451         else if (error == ERESTART) {
  452                 if (hz != 0)
  453                         error = EINTR;
  454         }
  455         return (error);
  456 }
  457 
  458 int
  459 thr_wake(struct thread *td, struct thr_wake_args *uap)
  460         /* long id */
  461 {
  462         struct proc *p;
  463         struct thread *ttd;
  464 
  465         if (uap->id == td->td_tid) {
  466                 td->td_pflags |= TDP_WAKEUP;
  467                 return (0);
  468         } 
  469 
  470         p = td->td_proc;
  471         PROC_LOCK(p);
  472         ttd = thread_find(p, uap->id);
  473         if (ttd == NULL) {
  474                 PROC_UNLOCK(p);
  475                 return (ESRCH);
  476         }
  477         thread_lock(ttd);
  478         ttd->td_flags |= TDF_THRWAKEUP;
  479         thread_unlock(ttd);
  480         wakeup((void *)ttd);
  481         PROC_UNLOCK(p);
  482         return (0);
  483 }
  484 
  485 int
  486 thr_set_name(struct thread *td, struct thr_set_name_args *uap)
  487 {
  488         struct proc *p = td->td_proc;
  489         char name[MAXCOMLEN + 1];
  490         struct thread *ttd;
  491         int error;
  492 
  493         error = 0;
  494         name[0] = '\0';
  495         if (uap->name != NULL) {
  496                 error = copyinstr(uap->name, name, sizeof(name),
  497                         NULL);
  498                 if (error)
  499                         return (error);
  500         }
  501         PROC_LOCK(p);
  502         if (uap->id == td->td_tid)
  503                 ttd = td;
  504         else
  505                 ttd = thread_find(p, uap->id);
  506         if (ttd != NULL)
  507                 strcpy(ttd->td_name, name);
  508         else 
  509                 error = ESRCH;
  510         PROC_UNLOCK(p);
  511         return (error);
  512 }
Cache object: fa1cf1504d980464afc551e7f15dff87
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.
FreeBSD/Linux Kernel Cross Reference sys/kern/kern_thr.c

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