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/9.0/sys/kern/kern_thr.c 225617 2011-09-16 13:58:51Z kmacy $");
   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 SYSCTL_NODE(_kern, OID_AUTO, threads, CTLFLAG_RW, 0, "thread allocation");
   62 
   63 static int max_threads_per_proc = 1500;
   64 SYSCTL_INT(_kern_threads, OID_AUTO, max_threads_per_proc, CTLFLAG_RW,
   65         &max_threads_per_proc, 0, "Limit on threads per proc");
   66 
   67 static int max_threads_hits;
   68 SYSCTL_INT(_kern_threads, OID_AUTO, max_threads_hits, CTLFLAG_RD,
   69         &max_threads_hits, 0, "");
   70 
   71 #ifdef COMPAT_FREEBSD32
   72 
   73 static inline int
   74 suword_lwpid(void *addr, lwpid_t lwpid)
   75 {
   76         int error;
   77 
   78         if (SV_CURPROC_FLAG(SV_LP64))
   79                 error = suword(addr, lwpid);
   80         else
   81                 error = suword32(addr, lwpid);
   82         return (error);
   83 }
   84 
   85 #else
   86 #define suword_lwpid    suword
   87 #endif
   88 
   89 static int create_thread(struct thread *td, mcontext_t *ctx,
   90                          void (*start_func)(void *), void *arg,
   91                          char *stack_base, size_t stack_size,
   92                          char *tls_base,
   93                          long *child_tid, long *parent_tid,
   94                          int flags, struct rtprio *rtp);
   95 
   96 /*
   97  * System call interface.
   98  */
   99 int
  100 sys_thr_create(struct thread *td, struct thr_create_args *uap)
  101     /* ucontext_t *ctx, long *id, int flags */
  102 {
  103         ucontext_t ctx;
  104         int error;
  105 
  106         if ((error = copyin(uap->ctx, &ctx, sizeof(ctx))))
  107                 return (error);
  108 
  109         error = create_thread(td, &ctx.uc_mcontext, NULL, NULL,
  110                 NULL, 0, NULL, uap->id, NULL, uap->flags, NULL);
  111         return (error);
  112 }
  113 
  114 int
  115 sys_thr_new(struct thread *td, struct thr_new_args *uap)
  116     /* struct thr_param * */
  117 {
  118         struct thr_param param;
  119         int error;
  120 
  121         if (uap->param_size < 0 || uap->param_size > sizeof(param))
  122                 return (EINVAL);
  123         bzero(&param, sizeof(param));
  124         if ((error = copyin(uap->param, &param, uap->param_size)))
  125                 return (error);
  126         return (kern_thr_new(td, &param));
  127 }
  128 
  129 int
  130 kern_thr_new(struct thread *td, struct thr_param *param)
  131 {
  132         struct rtprio rtp, *rtpp;
  133         int error;
  134 
  135         rtpp = NULL;
  136         if (param->rtp != 0) {
  137                 error = copyin(param->rtp, &rtp, sizeof(struct rtprio));
  138                 if (error)
  139                         return (error);
  140                 rtpp = &rtp;
  141         }
  142         error = create_thread(td, NULL, param->start_func, param->arg,
  143                 param->stack_base, param->stack_size, param->tls_base,
  144                 param->child_tid, param->parent_tid, param->flags,
  145                 rtpp);
  146         return (error);
  147 }
  148 
  149 static int
  150 create_thread(struct thread *td, mcontext_t *ctx,
  151             void (*start_func)(void *), void *arg,
  152             char *stack_base, size_t stack_size,
  153             char *tls_base,
  154             long *child_tid, long *parent_tid,
  155             int flags, struct rtprio *rtp)
  156 {
  157         stack_t stack;
  158         struct thread *newtd;
  159         struct proc *p;
  160         int error;
  161 
  162         p = td->td_proc;
  163 
  164         /* Have race condition but it is cheap. */
  165         if (p->p_numthreads >= max_threads_per_proc) {
  166                 ++max_threads_hits;
  167                 return (EPROCLIM);
  168         }
  169 
  170         if (rtp != NULL) {
  171                 switch(rtp->type) {
  172                 case RTP_PRIO_REALTIME:
  173                 case RTP_PRIO_FIFO:
  174                         /* Only root can set scheduler policy */
  175                         if (priv_check(td, PRIV_SCHED_SETPOLICY) != 0)
  176                                 return (EPERM);
  177                         if (rtp->prio > RTP_PRIO_MAX)
  178                                 return (EINVAL);
  179                         break;
  180                 case RTP_PRIO_NORMAL:
  181                         rtp->prio = 0;
  182                         break;
  183                 default:
  184                         return (EINVAL);
  185                 }
  186         }
  187 
  188 #ifdef RACCT
  189         PROC_LOCK(td->td_proc);
  190         error = racct_add(p, RACCT_NTHR, 1);
  191         PROC_UNLOCK(td->td_proc);
  192         if (error != 0)
  193                 return (EPROCLIM);
  194 #endif
  195 
  196         /* Initialize our td */
  197         newtd = thread_alloc(0);
  198         if (newtd == NULL) {
  199                 error = ENOMEM;
  200                 goto fail;
  201         }
  202 
  203         /*
  204          * Try the copyout as soon as we allocate the td so we don't
  205          * have to tear things down in a failure case below.
  206          * Here we copy out tid to two places, one for child and one
  207          * for parent, because pthread can create a detached thread,
  208          * if parent wants to safely access child tid, it has to provide 
  209          * its storage, because child thread may exit quickly and
  210          * memory is freed before parent thread can access it.
  211          */
  212         if ((child_tid != NULL &&
  213             suword_lwpid(child_tid, newtd->td_tid)) ||
  214             (parent_tid != NULL &&
  215             suword_lwpid(parent_tid, newtd->td_tid))) {
  216                 thread_free(newtd);
  217                 error = EFAULT;
  218                 goto fail;
  219         }
  220 
  221         bzero(&newtd->td_startzero,
  222             __rangeof(struct thread, td_startzero, td_endzero));
  223         bcopy(&td->td_startcopy, &newtd->td_startcopy,
  224             __rangeof(struct thread, td_startcopy, td_endcopy));
  225         newtd->td_proc = td->td_proc;
  226         newtd->td_ucred = crhold(td->td_ucred);
  227 
  228         cpu_set_upcall(newtd, td);
  229 
  230         if (ctx != NULL) { /* old way to set user context */
  231                 error = set_mcontext(newtd, ctx);
  232                 if (error != 0) {
  233                         thread_free(newtd);
  234                         crfree(td->td_ucred);
  235                         goto fail;
  236                 }
  237         } else {
  238                 /* Set up our machine context. */
  239                 stack.ss_sp = stack_base;
  240                 stack.ss_size = stack_size;
  241                 /* Set upcall address to user thread entry function. */
  242                 cpu_set_upcall_kse(newtd, start_func, arg, &stack);
  243                 /* Setup user TLS address and TLS pointer register. */
  244                 error = cpu_set_user_tls(newtd, tls_base);
  245                 if (error != 0) {
  246                         thread_free(newtd);
  247                         crfree(td->td_ucred);
  248                         goto fail;
  249                 }
  250         }
  251 
  252         PROC_LOCK(td->td_proc);
  253         td->td_proc->p_flag |= P_HADTHREADS;
  254         newtd->td_sigmask = td->td_sigmask;
  255         thread_link(newtd, p); 
  256         bcopy(p->p_comm, newtd->td_name, sizeof(newtd->td_name));
  257         thread_lock(td);
  258         /* let the scheduler know about these things. */
  259         sched_fork_thread(td, newtd);
  260         thread_unlock(td);
  261         if (P_SHOULDSTOP(p))
  262                 newtd->td_flags |= TDF_ASTPENDING | TDF_NEEDSUSPCHK;
  263         PROC_UNLOCK(p);
  264 
  265         tidhash_add(newtd);
  266 
  267         thread_lock(newtd);
  268         if (rtp != NULL) {
  269                 if (!(td->td_pri_class == PRI_TIMESHARE &&
  270                       rtp->type == RTP_PRIO_NORMAL)) {
  271                         rtp_to_pri(rtp, newtd);
  272                         sched_prio(newtd, newtd->td_user_pri);
  273                 } /* ignore timesharing class */
  274         }
  275         TD_SET_CAN_RUN(newtd);
  276         sched_add(newtd, SRQ_BORING);
  277         thread_unlock(newtd);
  278 
  279         return (0);
  280 
  281 fail:
  282 #ifdef RACCT
  283         PROC_LOCK(p);
  284         racct_sub(p, RACCT_NTHR, 1);
  285         PROC_UNLOCK(p);
  286 #endif
  287         return (error);
  288 }
  289 
  290 int
  291 sys_thr_self(struct thread *td, struct thr_self_args *uap)
  292     /* long *id */
  293 {
  294         int error;
  295 
  296         error = suword_lwpid(uap->id, (unsigned)td->td_tid);
  297         if (error == -1)
  298                 return (EFAULT);
  299         return (0);
  300 }
  301 
  302 int
  303 sys_thr_exit(struct thread *td, struct thr_exit_args *uap)
  304     /* long *state */
  305 {
  306         struct proc *p;
  307 
  308         p = td->td_proc;
  309 
  310         /* Signal userland that it can free the stack. */
  311         if ((void *)uap->state != NULL) {
  312                 suword_lwpid(uap->state, 1);
  313                 kern_umtx_wake(td, uap->state, INT_MAX, 0);
  314         }
  315 
  316         rw_wlock(&tidhash_lock);
  317 
  318         PROC_LOCK(p);
  319         racct_sub(p, RACCT_NTHR, 1);
  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                 LIST_REMOVE(td, td_hash);
  327                 rw_wunlock(&tidhash_lock);
  328                 tdsigcleanup(td);
  329                 PROC_SLOCK(p);
  330                 thread_stopped(p);
  331                 thread_exit();
  332                 /* NOTREACHED */
  333         }
  334         PROC_UNLOCK(p);
  335         rw_wunlock(&tidhash_lock);
  336         return (0);
  337 }
  338 
  339 int
  340 sys_thr_kill(struct thread *td, struct thr_kill_args *uap)
  341     /* long id, int sig */
  342 {
  343         ksiginfo_t ksi;
  344         struct thread *ttd;
  345         struct proc *p;
  346         int error;
  347 
  348         p = td->td_proc;
  349         ksiginfo_init(&ksi);
  350         ksi.ksi_signo = uap->sig;
  351         ksi.ksi_code = SI_LWP;
  352         ksi.ksi_pid = p->p_pid;
  353         ksi.ksi_uid = td->td_ucred->cr_ruid;
  354         if (uap->id == -1) {
  355                 if (uap->sig != 0 && !_SIG_VALID(uap->sig)) {
  356                         error = EINVAL;
  357                 } else {
  358                         error = ESRCH;
  359                         PROC_LOCK(p);
  360                         FOREACH_THREAD_IN_PROC(p, ttd) {
  361                                 if (ttd != td) {
  362                                         error = 0;
  363                                         if (uap->sig == 0)
  364                                                 break;
  365                                         tdksignal(ttd, uap->sig, &ksi);
  366                                 }
  367                         }
  368                         PROC_UNLOCK(p);
  369                 }
  370         } else {
  371                 error = 0;
  372                 ttd = tdfind((lwpid_t)uap->id, p->p_pid);
  373                 if (ttd == NULL)
  374                         return (ESRCH);
  375                 if (uap->sig == 0)
  376                         ;
  377                 else if (!_SIG_VALID(uap->sig))
  378                         error = EINVAL;
  379                 else 
  380                         tdksignal(ttd, uap->sig, &ksi);
  381                 PROC_UNLOCK(ttd->td_proc);
  382         }
  383         return (error);
  384 }
  385 
  386 int
  387 sys_thr_kill2(struct thread *td, struct thr_kill2_args *uap)
  388     /* pid_t pid, long id, int sig */
  389 {
  390         ksiginfo_t ksi;
  391         struct thread *ttd;
  392         struct proc *p;
  393         int error;
  394 
  395         AUDIT_ARG_SIGNUM(uap->sig);
  396 
  397         ksiginfo_init(&ksi);
  398         ksi.ksi_signo = uap->sig;
  399         ksi.ksi_code = SI_LWP;
  400         ksi.ksi_pid = td->td_proc->p_pid;
  401         ksi.ksi_uid = td->td_ucred->cr_ruid;
  402         if (uap->id == -1) {
  403                 if ((p = pfind(uap->pid)) == NULL)
  404                         return (ESRCH);
  405                 AUDIT_ARG_PROCESS(p);
  406                 error = p_cansignal(td, p, uap->sig);
  407                 if (error) {
  408                         PROC_UNLOCK(p);
  409                         return (error);
  410                 }
  411                 if (uap->sig != 0 && !_SIG_VALID(uap->sig)) {
  412                         error = EINVAL;
  413                 } else {
  414                         error = ESRCH;
  415                         FOREACH_THREAD_IN_PROC(p, ttd) {
  416                                 if (ttd != td) {
  417                                         error = 0;
  418                                         if (uap->sig == 0)
  419                                                 break;
  420                                         tdksignal(ttd, uap->sig, &ksi);
  421                                 }
  422                         }
  423                 }
  424                 PROC_UNLOCK(p);
  425         } else {
  426                 ttd = tdfind((lwpid_t)uap->id, uap->pid);
  427                 if (ttd == NULL)
  428                         return (ESRCH);
  429                 p = ttd->td_proc;
  430                 AUDIT_ARG_PROCESS(p);
  431                 error = p_cansignal(td, p, uap->sig);
  432                 if (uap->sig == 0)
  433                         ;
  434                 else if (!_SIG_VALID(uap->sig))
  435                         error = EINVAL;
  436                 else
  437                         tdksignal(ttd, uap->sig, &ksi);
  438                 PROC_UNLOCK(p);
  439         }
  440         return (error);
  441 }
  442 
  443 int
  444 sys_thr_suspend(struct thread *td, struct thr_suspend_args *uap)
  445         /* const struct timespec *timeout */
  446 {
  447         struct timespec ts, *tsp;
  448         int error;
  449 
  450         tsp = NULL;
  451         if (uap->timeout != NULL) {
  452                 error = copyin((const void *)uap->timeout, (void *)&ts,
  453                     sizeof(struct timespec));
  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_nsec < 0 || tsp->tv_nsec > 1000000000)
  477                         return (EINVAL);
  478                 if (tsp->tv_sec == 0 && tsp->tv_nsec == 0)
  479                         error = EWOULDBLOCK;
  480                 else {
  481                         TIMESPEC_TO_TIMEVAL(&tv, tsp);
  482                         timo = tvtohz(&tv);
  483                 }
  484         }
  485 
  486         PROC_LOCK(p);
  487         if (error == 0 && (td->td_flags & TDF_THRWAKEUP) == 0)
  488                 error = msleep((void *)td, &p->p_mtx,
  489                          PCATCH, "lthr", timo);
  490 
  491         if (td->td_flags & TDF_THRWAKEUP) {
  492                 thread_lock(td);
  493                 td->td_flags &= ~TDF_THRWAKEUP;
  494                 thread_unlock(td);
  495                 PROC_UNLOCK(p);
  496                 return (0);
  497         }
  498         PROC_UNLOCK(p);
  499         if (error == EWOULDBLOCK)
  500                 error = ETIMEDOUT;
  501         else if (error == ERESTART) {
  502                 if (timo != 0)
  503                         error = EINTR;
  504         }
  505         return (error);
  506 }
  507 
  508 int
  509 sys_thr_wake(struct thread *td, struct thr_wake_args *uap)
  510         /* long id */
  511 {
  512         struct proc *p;
  513         struct thread *ttd;
  514 
  515         if (uap->id == td->td_tid) {
  516                 td->td_pflags |= TDP_WAKEUP;
  517                 return (0);
  518         } 
  519 
  520         p = td->td_proc;
  521         ttd = tdfind((lwpid_t)uap->id, p->p_pid);
  522         if (ttd == NULL)
  523                 return (ESRCH);
  524         thread_lock(ttd);
  525         ttd->td_flags |= TDF_THRWAKEUP;
  526         thread_unlock(ttd);
  527         wakeup((void *)ttd);
  528         PROC_UNLOCK(p);
  529         return (0);
  530 }
  531 
  532 int
  533 sys_thr_set_name(struct thread *td, struct thr_set_name_args *uap)
  534 {
  535         struct proc *p;
  536         char name[MAXCOMLEN + 1];
  537         struct thread *ttd;
  538         int error;
  539 
  540         error = 0;
  541         name[0] = '\0';
  542         if (uap->name != NULL) {
  543                 error = copyinstr(uap->name, name, sizeof(name),
  544                         NULL);
  545                 if (error)
  546                         return (error);
  547         }
  548         p = td->td_proc;
  549         ttd = tdfind((lwpid_t)uap->id, p->p_pid);
  550         if (ttd == NULL)
  551                 return (ESRCH);
  552         strcpy(ttd->td_name, name);
  553         PROC_UNLOCK(p);
  554         return (error);
  555 }

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