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/8.1/sys/kern/kern_thr.c 207916 2010-05-11 13:18:41Z 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         bcopy(&td->td_startcopy, &newtd->td_startcopy,
  204             __rangeof(struct thread, td_startcopy, td_endcopy));
  205         newtd->td_proc = td->td_proc;
  206         newtd->td_ucred = crhold(td->td_ucred);
  207 
  208         cpu_set_upcall(newtd, td);
  209 
  210         if (ctx != NULL) { /* old way to set user context */
  211                 error = set_mcontext(newtd, ctx);
  212                 if (error != 0) {
  213                         thread_free(newtd);
  214                         crfree(td->td_ucred);
  215                         return (error);
  216                 }
  217         } else {
  218                 /* Set up our machine context. */
  219                 stack.ss_sp = stack_base;
  220                 stack.ss_size = stack_size;
  221                 /* Set upcall address to user thread entry function. */
  222                 cpu_set_upcall_kse(newtd, start_func, arg, &stack);
  223                 /* Setup user TLS address and TLS pointer register. */
  224                 error = cpu_set_user_tls(newtd, tls_base);
  225                 if (error != 0) {
  226                         thread_free(newtd);
  227                         crfree(td->td_ucred);
  228                         return (error);
  229                 }
  230         }
  231 
  232         PROC_LOCK(td->td_proc);
  233         td->td_proc->p_flag |= P_HADTHREADS;
  234         newtd->td_sigmask = td->td_sigmask;
  235         thread_link(newtd, p); 
  236         bcopy(p->p_comm, newtd->td_name, sizeof(newtd->td_name));
  237         thread_lock(td);
  238         /* let the scheduler know about these things. */
  239         sched_fork_thread(td, newtd);
  240         thread_unlock(td);
  241         if (P_SHOULDSTOP(p))
  242                 newtd->td_flags |= TDF_ASTPENDING | TDF_NEEDSUSPCHK;
  243         PROC_UNLOCK(p);
  244         thread_lock(newtd);
  245         if (rtp != NULL) {
  246                 if (!(td->td_pri_class == PRI_TIMESHARE &&
  247                       rtp->type == RTP_PRIO_NORMAL)) {
  248                         rtp_to_pri(rtp, newtd);
  249                         sched_prio(newtd, newtd->td_user_pri);
  250                 } /* ignore timesharing class */
  251         }
  252         TD_SET_CAN_RUN(newtd);
  253         sched_add(newtd, SRQ_BORING);
  254         thread_unlock(newtd);
  255 
  256         return (0);
  257 }
  258 
  259 int
  260 thr_self(struct thread *td, struct thr_self_args *uap)
  261     /* long *id */
  262 {
  263         int error;
  264 
  265         error = suword_lwpid(uap->id, (unsigned)td->td_tid);
  266         if (error == -1)
  267                 return (EFAULT);
  268         return (0);
  269 }
  270 
  271 int
  272 thr_exit(struct thread *td, struct thr_exit_args *uap)
  273     /* long *state */
  274 {
  275         struct proc *p;
  276 
  277         p = td->td_proc;
  278 
  279         /* Signal userland that it can free the stack. */
  280         if ((void *)uap->state != NULL) {
  281                 suword_lwpid(uap->state, 1);
  282                 kern_umtx_wake(td, uap->state, INT_MAX, 0);
  283         }
  284 
  285         PROC_LOCK(p);
  286         tdsigcleanup(td);
  287         PROC_SLOCK(p);
  288 
  289         /*
  290          * Shutting down last thread in the proc.  This will actually
  291          * call exit() in the trampoline when it returns.
  292          */
  293         if (p->p_numthreads != 1) {
  294                 thread_stopped(p);
  295                 thread_exit();
  296                 /* NOTREACHED */
  297         }
  298         PROC_SUNLOCK(p);
  299         PROC_UNLOCK(p);
  300         return (0);
  301 }
  302 
  303 int
  304 thr_kill(struct thread *td, struct thr_kill_args *uap)
  305     /* long id, int sig */
  306 {
  307         ksiginfo_t ksi;
  308         struct thread *ttd;
  309         struct proc *p;
  310         int error;
  311 
  312         p = td->td_proc;
  313         error = 0;
  314         ksiginfo_init(&ksi);
  315         ksi.ksi_signo = uap->sig;
  316         ksi.ksi_code = SI_USER;
  317         ksi.ksi_pid = p->p_pid;
  318         ksi.ksi_uid = td->td_ucred->cr_ruid;
  319         PROC_LOCK(p);
  320         if (uap->id == -1) {
  321                 if (uap->sig != 0 && !_SIG_VALID(uap->sig)) {
  322                         error = EINVAL;
  323                 } else {
  324                         error = ESRCH;
  325                         FOREACH_THREAD_IN_PROC(p, ttd) {
  326                                 if (ttd != td) {
  327                                         error = 0;
  328                                         if (uap->sig == 0)
  329                                                 break;
  330                                         tdsignal(p, ttd, uap->sig, &ksi);
  331                                 }
  332                         }
  333                 }
  334         } else {
  335                 if (uap->id != td->td_tid)
  336                         ttd = thread_find(p, uap->id);
  337                 else
  338                         ttd = td;
  339                 if (ttd == NULL)
  340                         error = ESRCH;
  341                 else if (uap->sig == 0)
  342                         ;
  343                 else if (!_SIG_VALID(uap->sig))
  344                         error = EINVAL;
  345                 else
  346                         tdsignal(p, ttd, uap->sig, &ksi);
  347         }
  348         PROC_UNLOCK(p);
  349         return (error);
  350 }
  351 
  352 int
  353 thr_kill2(struct thread *td, struct thr_kill2_args *uap)
  354     /* pid_t pid, long id, int sig */
  355 {
  356         ksiginfo_t ksi;
  357         struct thread *ttd;
  358         struct proc *p;
  359         int error;
  360 
  361         AUDIT_ARG_SIGNUM(uap->sig);
  362 
  363         if (uap->pid == td->td_proc->p_pid) {
  364                 p = td->td_proc;
  365                 PROC_LOCK(p);
  366         } else if ((p = pfind(uap->pid)) == NULL) {
  367                 return (ESRCH);
  368         }
  369         AUDIT_ARG_PROCESS(p);
  370 
  371         error = p_cansignal(td, p, uap->sig);
  372         if (error == 0) {
  373                 ksiginfo_init(&ksi);
  374                 ksi.ksi_signo = uap->sig;
  375                 ksi.ksi_code = SI_USER;
  376                 ksi.ksi_pid = td->td_proc->p_pid;
  377                 ksi.ksi_uid = td->td_ucred->cr_ruid;
  378                 if (uap->id == -1) {
  379                         if (uap->sig != 0 && !_SIG_VALID(uap->sig)) {
  380                                 error = EINVAL;
  381                         } else {
  382                                 error = ESRCH;
  383                                 FOREACH_THREAD_IN_PROC(p, ttd) {
  384                                         if (ttd != td) {
  385                                                 error = 0;
  386                                                 if (uap->sig == 0)
  387                                                         break;
  388                                                 tdsignal(p, ttd, uap->sig,
  389                                                     &ksi);
  390                                         }
  391                                 }
  392                         }
  393                 } else {
  394                         if (uap->id != td->td_tid)
  395                                 ttd = thread_find(p, uap->id);
  396                         else
  397                                 ttd = td;
  398                         if (ttd == NULL)
  399                                 error = ESRCH;
  400                         else if (uap->sig == 0)
  401                                 ;
  402                         else if (!_SIG_VALID(uap->sig))
  403                                 error = EINVAL;
  404                         else
  405                                 tdsignal(p, ttd, uap->sig, &ksi);
  406                 }
  407         }
  408         PROC_UNLOCK(p);
  409         return (error);
  410 }
  411 
  412 int
  413 thr_suspend(struct thread *td, struct thr_suspend_args *uap)
  414         /* const struct timespec *timeout */
  415 {
  416         struct timespec ts, *tsp;
  417         int error;
  418 
  419         tsp = NULL;
  420         if (uap->timeout != NULL) {
  421                 error = copyin((const void *)uap->timeout, (void *)&ts,
  422                     sizeof(struct timespec));
  423                 if (error != 0)
  424                         return (error);
  425                 tsp = &ts;
  426         }
  427 
  428         return (kern_thr_suspend(td, tsp));
  429 }
  430 
  431 int
  432 kern_thr_suspend(struct thread *td, struct timespec *tsp)
  433 {
  434         struct timeval tv;
  435         int error = 0, hz = 0;
  436 
  437         if (tsp != NULL) {
  438                 if (tsp->tv_nsec < 0 || tsp->tv_nsec > 1000000000)
  439                         return (EINVAL);
  440                 if (tsp->tv_sec == 0 && tsp->tv_nsec == 0)
  441                         return (ETIMEDOUT);
  442                 TIMESPEC_TO_TIMEVAL(&tv, tsp);
  443                 hz = tvtohz(&tv);
  444         }
  445 
  446         if (td->td_pflags & TDP_WAKEUP) {
  447                 td->td_pflags &= ~TDP_WAKEUP;
  448                 return (0);
  449         }
  450 
  451         PROC_LOCK(td->td_proc);
  452         if ((td->td_flags & TDF_THRWAKEUP) == 0)
  453                 error = msleep((void *)td, &td->td_proc->p_mtx, PCATCH, "lthr",
  454                     hz);
  455         if (td->td_flags & TDF_THRWAKEUP) {
  456                 thread_lock(td);
  457                 td->td_flags &= ~TDF_THRWAKEUP;
  458                 thread_unlock(td);
  459                 PROC_UNLOCK(td->td_proc);
  460                 return (0);
  461         }
  462         PROC_UNLOCK(td->td_proc);
  463         if (error == EWOULDBLOCK)
  464                 error = ETIMEDOUT;
  465         else if (error == ERESTART) {
  466                 if (hz != 0)
  467                         error = EINTR;
  468         }
  469         return (error);
  470 }
  471 
  472 int
  473 thr_wake(struct thread *td, struct thr_wake_args *uap)
  474         /* long id */
  475 {
  476         struct proc *p;
  477         struct thread *ttd;
  478 
  479         if (uap->id == td->td_tid) {
  480                 td->td_pflags |= TDP_WAKEUP;
  481                 return (0);
  482         } 
  483 
  484         p = td->td_proc;
  485         PROC_LOCK(p);
  486         ttd = thread_find(p, uap->id);
  487         if (ttd == NULL) {
  488                 PROC_UNLOCK(p);
  489                 return (ESRCH);
  490         }
  491         thread_lock(ttd);
  492         ttd->td_flags |= TDF_THRWAKEUP;
  493         thread_unlock(ttd);
  494         wakeup((void *)ttd);
  495         PROC_UNLOCK(p);
  496         return (0);
  497 }
  498 
  499 int
  500 thr_set_name(struct thread *td, struct thr_set_name_args *uap)
  501 {
  502         struct proc *p = td->td_proc;
  503         char name[MAXCOMLEN + 1];
  504         struct thread *ttd;
  505         int error;
  506 
  507         error = 0;
  508         name[0] = '\0';
  509         if (uap->name != NULL) {
  510                 error = copyinstr(uap->name, name, sizeof(name),
  511                         NULL);
  512                 if (error)
  513                         return (error);
  514         }
  515         PROC_LOCK(p);
  516         if (uap->id == td->td_tid)
  517                 ttd = td;
  518         else
  519                 ttd = thread_find(p, uap->id);
  520         if (ttd != NULL)
  521                 strcpy(ttd->td_name, name);
  522         else 
  523                 error = ESRCH;
  524         PROC_UNLOCK(p);
  525         return (error);
  526 }
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FreeBSD/Linux Kernel Cross Reference sys/kern/kern_thr.c

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