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/7.4/sys/kern/kern_thr.c 192493 2009-05-20 22:30:57Z 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/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 extern struct sysentvec ia32_freebsd_sysvec;
   61 
   62 static inline int
   63 suword_lwpid(void *addr, lwpid_t lwpid)
   64 {
   65         int error;
   66 
   67         if (curproc->p_sysent != &ia32_freebsd_sysvec)
   68                 error = suword(addr, lwpid);
   69         else
   70                 error = suword32(addr, lwpid);
   71         return (error);
   72 }
   73 
   74 #else
   75 #define suword_lwpid    suword
   76 #endif
   77 
   78 extern int max_threads_per_proc;
   79 
   80 static int create_thread(struct thread *td, mcontext_t *ctx,
   81                          void (*start_func)(void *), void *arg,
   82                          char *stack_base, size_t stack_size,
   83                          char *tls_base,
   84                          long *child_tid, long *parent_tid,
   85                          int flags, struct rtprio *rtp);
   86 
   87 /*
   88  * System call interface.
   89  */
   90 int
   91 thr_create(struct thread *td, struct thr_create_args *uap)
   92     /* ucontext_t *ctx, long *id, int flags */
   93 {
   94         ucontext_t ctx;
   95         int error;
   96 
   97         if ((error = copyin(uap->ctx, &ctx, sizeof(ctx))))
   98                 return (error);
   99 
  100         error = create_thread(td, &ctx.uc_mcontext, NULL, NULL,
  101                 NULL, 0, NULL, uap->id, NULL, uap->flags, NULL);
  102         return (error);
  103 }
  104 
  105 int
  106 thr_new(struct thread *td, struct thr_new_args *uap)
  107     /* struct thr_param * */
  108 {
  109         struct thr_param param;
  110         int error;
  111 
  112         if (uap->param_size < 0 || uap->param_size > sizeof(param))
  113                 return (EINVAL);
  114         bzero(&param, sizeof(param));
  115         if ((error = copyin(uap->param, &param, uap->param_size)))
  116                 return (error);
  117         return (kern_thr_new(td, &param));
  118 }
  119 
  120 int
  121 kern_thr_new(struct thread *td, struct thr_param *param)
  122 {
  123         struct rtprio rtp, *rtpp;
  124         int error;
  125 
  126         rtpp = NULL;
  127         if (param->rtp != 0) {
  128                 error = copyin(param->rtp, &rtp, sizeof(struct rtprio));
  129                 rtpp = &rtp;
  130         }
  131         error = create_thread(td, NULL, param->start_func, param->arg,
  132                 param->stack_base, param->stack_size, param->tls_base,
  133                 param->child_tid, param->parent_tid, param->flags,
  134                 rtpp);
  135         return (error);
  136 }
  137 
  138 static int
  139 create_thread(struct thread *td, mcontext_t *ctx,
  140             void (*start_func)(void *), void *arg,
  141             char *stack_base, size_t stack_size,
  142             char *tls_base,
  143             long *child_tid, long *parent_tid,
  144             int flags, struct rtprio *rtp)
  145 {
  146         stack_t stack;
  147         struct thread *newtd;
  148         struct proc *p;
  149         int error;
  150 
  151         error = 0;
  152         p = td->td_proc;
  153 
  154         /* Have race condition but it is cheap. */
  155         if (p->p_numthreads >= max_threads_per_proc)
  156                 return (EPROCLIM);
  157 
  158         if (rtp != NULL) {
  159                 switch(rtp->type) {
  160                 case RTP_PRIO_REALTIME:
  161                 case RTP_PRIO_FIFO:
  162                         /* Only root can set scheduler policy */
  163                         if (priv_check(td, PRIV_SCHED_SETPOLICY) != 0)
  164                                 return (EPERM);
  165                         if (rtp->prio > RTP_PRIO_MAX)
  166                                 return (EINVAL);
  167                         break;
  168                 case RTP_PRIO_NORMAL:
  169                         rtp->prio = 0;
  170                         break;
  171                 default:
  172                         return (EINVAL);
  173                 }
  174         }
  175 
  176         /* Initialize our td */
  177         newtd = thread_alloc();
  178         if (newtd == NULL)
  179                 return (ENOMEM);
  180 
  181         /*
  182          * Try the copyout as soon as we allocate the td so we don't
  183          * have to tear things down in a failure case below.
  184          * Here we copy out tid to two places, one for child and one
  185          * for parent, because pthread can create a detached thread,
  186          * if parent wants to safely access child tid, it has to provide 
  187          * its storage, because child thread may exit quickly and
  188          * memory is freed before parent thread can access it.
  189          */
  190         if ((child_tid != NULL &&
  191             suword_lwpid(child_tid, newtd->td_tid)) ||
  192             (parent_tid != NULL &&
  193             suword_lwpid(parent_tid, newtd->td_tid))) {
  194                 thread_free(newtd);
  195                 return (EFAULT);
  196         }
  197 
  198         bzero(&newtd->td_startzero,
  199             __rangeof(struct thread, td_startzero, td_endzero));
  200         bcopy(&td->td_startcopy, &newtd->td_startcopy,
  201             __rangeof(struct thread, td_startcopy, td_endcopy));
  202         bzero(&newtd->td_osd, sizeof(struct osd));
  203         newtd->td_proc = td->td_proc;
  204         newtd->td_ucred = crhold(td->td_ucred);
  205 
  206         cpu_set_upcall(newtd, td);
  207 
  208         if (ctx != NULL) { /* old way to set user context */
  209                 error = set_mcontext(newtd, ctx);
  210                 if (error != 0) {
  211                         thread_free(newtd);
  212                         crfree(td->td_ucred);
  213                         return (error);
  214                 }
  215         } else {
  216                 /* Set up our machine context. */
  217                 stack.ss_sp = stack_base;
  218                 stack.ss_size = stack_size;
  219                 /* Set upcall address to user thread entry function. */
  220                 cpu_set_upcall_kse(newtd, start_func, arg, &stack);
  221                 /* Setup user TLS address and TLS pointer register. */
  222                 error = cpu_set_user_tls(newtd, tls_base);
  223                 if (error != 0) {
  224                         thread_free(newtd);
  225                         crfree(td->td_ucred);
  226                         return (error);
  227                 }
  228         }
  229 
  230         PROC_LOCK(td->td_proc);
  231         td->td_proc->p_flag |= P_HADTHREADS;
  232         newtd->td_sigmask = td->td_sigmask;
  233         PROC_SLOCK(p);
  234         thread_link(newtd, p); 
  235         thread_lock(td);
  236         /* let the scheduler know about these things. */
  237         sched_fork_thread(td, newtd);
  238         thread_unlock(td);
  239         PROC_SUNLOCK(p);
  240         PROC_UNLOCK(p);
  241         thread_lock(newtd);
  242         if (rtp != NULL) {
  243                 if (!(td->td_pri_class == PRI_TIMESHARE &&
  244                       rtp->type == RTP_PRIO_NORMAL)) {
  245                         rtp_to_pri(rtp, newtd);
  246                         sched_prio(newtd, newtd->td_user_pri);
  247                 } /* ignore timesharing class */
  248         }
  249         TD_SET_CAN_RUN(newtd);
  250         /* if ((flags & THR_SUSPENDED) == 0) */
  251                 sched_add(newtd, SRQ_BORING);
  252         thread_unlock(newtd);
  253 
  254         return (error);
  255 }
  256 
  257 int
  258 thr_self(struct thread *td, struct thr_self_args *uap)
  259     /* long *id */
  260 {
  261         int error;
  262 
  263         error = suword_lwpid(uap->id, (unsigned)td->td_tid);
  264         if (error == -1)
  265                 return (EFAULT);
  266         return (0);
  267 }
  268 
  269 int
  270 thr_exit(struct thread *td, struct thr_exit_args *uap)
  271     /* long *state */
  272 {
  273         struct proc *p;
  274 
  275         p = td->td_proc;
  276 
  277         /* Signal userland that it can free the stack. */
  278         if ((void *)uap->state != NULL) {
  279                 suword_lwpid(uap->state, 1);
  280                 kern_umtx_wake(td, uap->state, INT_MAX, 0);
  281         }
  282 
  283         PROC_LOCK(p);
  284         sigqueue_flush(&td->td_sigqueue);
  285         PROC_SLOCK(p);
  286 
  287         /*
  288          * Shutting down last thread in the proc.  This will actually
  289          * call exit() in the trampoline when it returns.
  290          */
  291         if (p->p_numthreads != 1) {
  292                 thread_stopped(p);
  293                 thread_exit();
  294                 /* NOTREACHED */
  295         }
  296         PROC_SUNLOCK(p);
  297         PROC_UNLOCK(p);
  298         return (0);
  299 }
  300 
  301 int
  302 thr_kill(struct thread *td, struct thr_kill_args *uap)
  303     /* long id, int sig */
  304 {
  305         struct thread *ttd;
  306         struct proc *p;
  307         int error;
  308 
  309         p = td->td_proc;
  310         error = 0;
  311         PROC_LOCK(p);
  312         if (uap->id == -1) {
  313                 if (uap->sig != 0 && !_SIG_VALID(uap->sig)) {
  314                         error = EINVAL;
  315                 } else {
  316                         error = ESRCH;
  317                         FOREACH_THREAD_IN_PROC(p, ttd) {
  318                                 if (ttd != td) {
  319                                         error = 0;
  320                                         if (uap->sig == 0)
  321                                                 break;
  322                                         tdsignal(p, ttd, uap->sig, NULL);
  323                                 }
  324                         }
  325                 }
  326         } else {
  327                 if (uap->id != td->td_tid)
  328                         ttd = thread_find(p, uap->id);
  329                 else
  330                         ttd = td;
  331                 if (ttd == NULL)
  332                         error = ESRCH;
  333                 else if (uap->sig == 0)
  334                         ;
  335                 else if (!_SIG_VALID(uap->sig))
  336                         error = EINVAL;
  337                 else
  338                         tdsignal(p, ttd, uap->sig, NULL);
  339         }
  340         PROC_UNLOCK(p);
  341         return (error);
  342 }
  343 
  344 int
  345 thr_kill2(struct thread *td, struct thr_kill2_args *uap)
  346     /* pid_t pid, long id, int sig */
  347 {
  348         struct thread *ttd;
  349         struct proc *p;
  350         int error;
  351 
  352         AUDIT_ARG(signum, uap->sig);
  353 
  354         if (uap->pid == td->td_proc->p_pid) {
  355                 p = td->td_proc;
  356                 PROC_LOCK(p);
  357         } else if ((p = pfind(uap->pid)) == NULL) {
  358                 return (ESRCH);
  359         }
  360         AUDIT_ARG(process, p);
  361 
  362         error = p_cansignal(td, p, uap->sig);
  363         if (error == 0) {
  364                 if (uap->id == -1) {
  365                         if (uap->sig != 0 && !_SIG_VALID(uap->sig)) {
  366                                 error = EINVAL;
  367                         } else {
  368                                 error = ESRCH;
  369                                 FOREACH_THREAD_IN_PROC(p, ttd) {
  370                                         if (ttd != td) {
  371                                                 error = 0;
  372                                                 if (uap->sig == 0)
  373                                                         break;
  374                                                 tdsignal(p, ttd, uap->sig, NULL);
  375                                         }
  376                                 }
  377                         }
  378                 } else {
  379                         if (uap->id != td->td_tid)
  380                                 ttd = thread_find(p, uap->id);
  381                         else
  382                                 ttd = td;
  383                         if (ttd == NULL)
  384                                 error = ESRCH;
  385                         else if (uap->sig == 0)
  386                                 ;
  387                         else if (!_SIG_VALID(uap->sig))
  388                                 error = EINVAL;
  389                         else
  390                                 tdsignal(p, ttd, uap->sig, NULL);
  391                 }
  392         }
  393         PROC_UNLOCK(p);
  394         return (error);
  395 }
  396 
  397 int
  398 thr_suspend(struct thread *td, struct thr_suspend_args *uap)
  399         /* const struct timespec *timeout */
  400 {
  401         struct timespec ts, *tsp;
  402         int error;
  403 
  404         error = 0;
  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 }
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FreeBSD/Linux Kernel Cross Reference sys/kern/kern_thr.c

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