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/8.2/sys/kern/kern_thr.c 213362 2010-10-02 17:41:47Z 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_FREEBSD32
   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         bzero(&newtd->td_rux, sizeof(newtd->td_rux));
  203         newtd->td_map_def_user = NULL;
  204         bcopy(&td->td_startcopy, &newtd->td_startcopy,
  205             __rangeof(struct thread, td_startcopy, td_endcopy));
  206         newtd->td_proc = td->td_proc;
  207         newtd->td_ucred = crhold(td->td_ucred);
  208 
  209         cpu_set_upcall(newtd, td);
  210 
  211         if (ctx != NULL) { /* old way to set user context */
  212                 error = set_mcontext(newtd, ctx);
  213                 if (error != 0) {
  214                         thread_free(newtd);
  215                         crfree(td->td_ucred);
  216                         return (error);
  217                 }
  218         } else {
  219                 /* Set up our machine context. */
  220                 stack.ss_sp = stack_base;
  221                 stack.ss_size = stack_size;
  222                 /* Set upcall address to user thread entry function. */
  223                 cpu_set_upcall_kse(newtd, start_func, arg, &stack);
  224                 /* Setup user TLS address and TLS pointer register. */
  225                 error = cpu_set_user_tls(newtd, tls_base);
  226                 if (error != 0) {
  227                         thread_free(newtd);
  228                         crfree(td->td_ucred);
  229                         return (error);
  230                 }
  231         }
  232 
  233         PROC_LOCK(td->td_proc);
  234         td->td_proc->p_flag |= P_HADTHREADS;
  235         newtd->td_sigmask = td->td_sigmask;
  236         thread_link(newtd, p); 
  237         bcopy(p->p_comm, newtd->td_name, sizeof(newtd->td_name));
  238         thread_lock(td);
  239         /* let the scheduler know about these things. */
  240         sched_fork_thread(td, newtd);
  241         thread_unlock(td);
  242         if (P_SHOULDSTOP(p))
  243                 newtd->td_flags |= TDF_ASTPENDING | TDF_NEEDSUSPCHK;
  244         PROC_UNLOCK(p);
  245         thread_lock(newtd);
  246         if (rtp != NULL) {
  247                 if (!(td->td_pri_class == PRI_TIMESHARE &&
  248                       rtp->type == RTP_PRIO_NORMAL)) {
  249                         rtp_to_pri(rtp, newtd);
  250                         sched_prio(newtd, newtd->td_user_pri);
  251                 } /* ignore timesharing class */
  252         }
  253         TD_SET_CAN_RUN(newtd);
  254         sched_add(newtd, SRQ_BORING);
  255         thread_unlock(newtd);
  256 
  257         return (0);
  258 }
  259 
  260 int
  261 thr_self(struct thread *td, struct thr_self_args *uap)
  262     /* long *id */
  263 {
  264         int error;
  265 
  266         error = suword_lwpid(uap->id, (unsigned)td->td_tid);
  267         if (error == -1)
  268                 return (EFAULT);
  269         return (0);
  270 }
  271 
  272 int
  273 thr_exit(struct thread *td, struct thr_exit_args *uap)
  274     /* long *state */
  275 {
  276         struct proc *p;
  277 
  278         p = td->td_proc;
  279 
  280         /* Signal userland that it can free the stack. */
  281         if ((void *)uap->state != NULL) {
  282                 suword_lwpid(uap->state, 1);
  283                 kern_umtx_wake(td, uap->state, INT_MAX, 0);
  284         }
  285 
  286         PROC_LOCK(p);
  287         tdsigcleanup(td);
  288         PROC_SLOCK(p);
  289 
  290         /*
  291          * Shutting down last thread in the proc.  This will actually
  292          * call exit() in the trampoline when it returns.
  293          */
  294         if (p->p_numthreads != 1) {
  295                 thread_stopped(p);
  296                 thread_exit();
  297                 /* NOTREACHED */
  298         }
  299         PROC_SUNLOCK(p);
  300         PROC_UNLOCK(p);
  301         return (0);
  302 }
  303 
  304 int
  305 thr_kill(struct thread *td, struct thr_kill_args *uap)
  306     /* long id, int sig */
  307 {
  308         ksiginfo_t ksi;
  309         struct thread *ttd;
  310         struct proc *p;
  311         int error;
  312 
  313         p = td->td_proc;
  314         error = 0;
  315         ksiginfo_init(&ksi);
  316         ksi.ksi_signo = uap->sig;
  317         ksi.ksi_code = SI_USER;
  318         ksi.ksi_pid = p->p_pid;
  319         ksi.ksi_uid = td->td_ucred->cr_ruid;
  320         PROC_LOCK(p);
  321         if (uap->id == -1) {
  322                 if (uap->sig != 0 && !_SIG_VALID(uap->sig)) {
  323                         error = EINVAL;
  324                 } else {
  325                         error = ESRCH;
  326                         FOREACH_THREAD_IN_PROC(p, ttd) {
  327                                 if (ttd != td) {
  328                                         error = 0;
  329                                         if (uap->sig == 0)
  330                                                 break;
  331                                         tdsignal(p, ttd, uap->sig, &ksi);
  332                                 }
  333                         }
  334                 }
  335         } else {
  336                 if (uap->id != td->td_tid)
  337                         ttd = thread_find(p, uap->id);
  338                 else
  339                         ttd = td;
  340                 if (ttd == NULL)
  341                         error = ESRCH;
  342                 else if (uap->sig == 0)
  343                         ;
  344                 else if (!_SIG_VALID(uap->sig))
  345                         error = EINVAL;
  346                 else
  347                         tdsignal(p, ttd, uap->sig, &ksi);
  348         }
  349         PROC_UNLOCK(p);
  350         return (error);
  351 }
  352 
  353 int
  354 thr_kill2(struct thread *td, struct thr_kill2_args *uap)
  355     /* pid_t pid, long id, int sig */
  356 {
  357         ksiginfo_t ksi;
  358         struct thread *ttd;
  359         struct proc *p;
  360         int error;
  361 
  362         AUDIT_ARG_SIGNUM(uap->sig);
  363 
  364         if (uap->pid == td->td_proc->p_pid) {
  365                 p = td->td_proc;
  366                 PROC_LOCK(p);
  367         } else if ((p = pfind(uap->pid)) == NULL) {
  368                 return (ESRCH);
  369         }
  370         AUDIT_ARG_PROCESS(p);
  371 
  372         error = p_cansignal(td, p, uap->sig);
  373         if (error == 0) {
  374                 ksiginfo_init(&ksi);
  375                 ksi.ksi_signo = uap->sig;
  376                 ksi.ksi_code = SI_USER;
  377                 ksi.ksi_pid = td->td_proc->p_pid;
  378                 ksi.ksi_uid = td->td_ucred->cr_ruid;
  379                 if (uap->id == -1) {
  380                         if (uap->sig != 0 && !_SIG_VALID(uap->sig)) {
  381                                 error = EINVAL;
  382                         } else {
  383                                 error = ESRCH;
  384                                 FOREACH_THREAD_IN_PROC(p, ttd) {
  385                                         if (ttd != td) {
  386                                                 error = 0;
  387                                                 if (uap->sig == 0)
  388                                                         break;
  389                                                 tdsignal(p, ttd, uap->sig,
  390                                                     &ksi);
  391                                         }
  392                                 }
  393                         }
  394                 } else {
  395                         if (uap->id != td->td_tid)
  396                                 ttd = thread_find(p, uap->id);
  397                         else
  398                                 ttd = td;
  399                         if (ttd == NULL)
  400                                 error = ESRCH;
  401                         else if (uap->sig == 0)
  402                                 ;
  403                         else if (!_SIG_VALID(uap->sig))
  404                                 error = EINVAL;
  405                         else
  406                                 tdsignal(p, ttd, uap->sig, &ksi);
  407                 }
  408         }
  409         PROC_UNLOCK(p);
  410         return (error);
  411 }
  412 
  413 int
  414 thr_suspend(struct thread *td, struct thr_suspend_args *uap)
  415         /* const struct timespec *timeout */
  416 {
  417         struct timespec ts, *tsp;
  418         int error;
  419 
  420         tsp = NULL;
  421         if (uap->timeout != NULL) {
  422                 error = copyin((const void *)uap->timeout, (void *)&ts,
  423                     sizeof(struct timespec));
  424                 if (error != 0)
  425                         return (error);
  426                 tsp = &ts;
  427         }
  428 
  429         return (kern_thr_suspend(td, tsp));
  430 }
  431 
  432 int
  433 kern_thr_suspend(struct thread *td, struct timespec *tsp)
  434 {
  435         struct timeval tv;
  436         int error = 0, hz = 0;
  437 
  438         if (tsp != NULL) {
  439                 if (tsp->tv_nsec < 0 || tsp->tv_nsec > 1000000000)
  440                         return (EINVAL);
  441                 if (tsp->tv_sec == 0 && tsp->tv_nsec == 0)
  442                         return (ETIMEDOUT);
  443                 TIMESPEC_TO_TIMEVAL(&tv, tsp);
  444                 hz = tvtohz(&tv);
  445         }
  446 
  447         if (td->td_pflags & TDP_WAKEUP) {
  448                 td->td_pflags &= ~TDP_WAKEUP;
  449                 return (0);
  450         }
  451 
  452         PROC_LOCK(td->td_proc);
  453         if ((td->td_flags & TDF_THRWAKEUP) == 0)
  454                 error = msleep((void *)td, &td->td_proc->p_mtx, PCATCH, "lthr",
  455                     hz);
  456         if (td->td_flags & TDF_THRWAKEUP) {
  457                 thread_lock(td);
  458                 td->td_flags &= ~TDF_THRWAKEUP;
  459                 thread_unlock(td);
  460                 PROC_UNLOCK(td->td_proc);
  461                 return (0);
  462         }
  463         PROC_UNLOCK(td->td_proc);
  464         if (error == EWOULDBLOCK)
  465                 error = ETIMEDOUT;
  466         else if (error == ERESTART) {
  467                 if (hz != 0)
  468                         error = EINTR;
  469         }
  470         return (error);
  471 }
  472 
  473 int
  474 thr_wake(struct thread *td, struct thr_wake_args *uap)
  475         /* long id */
  476 {
  477         struct proc *p;
  478         struct thread *ttd;
  479 
  480         if (uap->id == td->td_tid) {
  481                 td->td_pflags |= TDP_WAKEUP;
  482                 return (0);
  483         } 
  484 
  485         p = td->td_proc;
  486         PROC_LOCK(p);
  487         ttd = thread_find(p, uap->id);
  488         if (ttd == NULL) {
  489                 PROC_UNLOCK(p);
  490                 return (ESRCH);
  491         }
  492         thread_lock(ttd);
  493         ttd->td_flags |= TDF_THRWAKEUP;
  494         thread_unlock(ttd);
  495         wakeup((void *)ttd);
  496         PROC_UNLOCK(p);
  497         return (0);
  498 }
  499 
  500 int
  501 thr_set_name(struct thread *td, struct thr_set_name_args *uap)
  502 {
  503         struct proc *p = td->td_proc;
  504         char name[MAXCOMLEN + 1];
  505         struct thread *ttd;
  506         int error;
  507 
  508         error = 0;
  509         name[0] = '\0';
  510         if (uap->name != NULL) {
  511                 error = copyinstr(uap->name, name, sizeof(name),
  512                         NULL);
  513                 if (error)
  514                         return (error);
  515         }
  516         PROC_LOCK(p);
  517         if (uap->id == td->td_tid)
  518                 ttd = td;
  519         else
  520                 ttd = thread_find(p, uap->id);
  521         if (ttd != NULL)
  522                 strcpy(ttd->td_name, name);
  523         else 
  524                 error = ESRCH;
  525         PROC_UNLOCK(p);
  526         return (error);
  527 }
Cache object: 4bf6eba24394d5a2af79ee3bd47f0710
[ 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
