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/10.3/sys/kern/kern_thr.c 293481 2016-01-09 14:38:29Z dchagin $");
   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 static SYSCTL_NODE(_kern, OID_AUTO, threads, CTLFLAG_RW, 0,
   62     "thread allocation");
   63 
   64 static int max_threads_per_proc = 1500;
   65 SYSCTL_INT(_kern_threads, OID_AUTO, max_threads_per_proc, CTLFLAG_RW,
   66     &max_threads_per_proc, 0, "Limit on threads per proc");
   67 
   68 static int max_threads_hits;
   69 SYSCTL_INT(_kern_threads, OID_AUTO, max_threads_hits, CTLFLAG_RD,
   70     &max_threads_hits, 0, "kern.threads.max_threads_per_proc hit count");
   71 
   72 #ifdef COMPAT_FREEBSD32
   73 
   74 static inline int
   75 suword_lwpid(void *addr, lwpid_t lwpid)
   76 {
   77         int error;
   78 
   79         if (SV_CURPROC_FLAG(SV_LP64))
   80                 error = suword(addr, lwpid);
   81         else
   82                 error = suword32(addr, lwpid);
   83         return (error);
   84 }
   85 
   86 #else
   87 #define suword_lwpid    suword
   88 #endif
   89 
   90 /*
   91  * System call interface.
   92  */
   93 
   94 struct thr_create_initthr_args {
   95         ucontext_t ctx;
   96         long *tid;
   97 };
   98 
   99 static int
  100 thr_create_initthr(struct thread *td, void *thunk)
  101 {
  102         struct thr_create_initthr_args *args;
  103 
  104         /* Copy out the child tid. */
  105         args = thunk;
  106         if (args->tid != NULL && suword_lwpid(args->tid, td->td_tid))
  107                 return (EFAULT);
  108 
  109         return (set_mcontext(td, &args->ctx.uc_mcontext));
  110 }
  111 
  112 int
  113 sys_thr_create(struct thread *td, struct thr_create_args *uap)
  114     /* ucontext_t *ctx, long *id, int flags */
  115 {
  116         struct thr_create_initthr_args args;
  117         int error;
  118 
  119         if ((error = copyin(uap->ctx, &args.ctx, sizeof(args.ctx))))
  120                 return (error);
  121         args.tid = uap->id;
  122         return (thread_create(td, NULL, thr_create_initthr, &args));
  123 }
  124 
  125 int
  126 sys_thr_new(struct thread *td, struct thr_new_args *uap)
  127     /* struct thr_param * */
  128 {
  129         struct thr_param param;
  130         int error;
  131 
  132         if (uap->param_size < 0 || uap->param_size > sizeof(param))
  133                 return (EINVAL);
  134         bzero(&param, sizeof(param));
  135         if ((error = copyin(uap->param, &param, uap->param_size)))
  136                 return (error);
  137         return (kern_thr_new(td, &param));
  138 }
  139 
  140 static int
  141 thr_new_initthr(struct thread *td, void *thunk)
  142 {
  143         stack_t stack;
  144         struct thr_param *param;
  145 
  146         /*
  147          * Here we copy out tid to two places, one for child and one
  148          * for parent, because pthread can create a detached thread,
  149          * if parent wants to safely access child tid, it has to provide
  150          * its storage, because child thread may exit quickly and
  151          * memory is freed before parent thread can access it.
  152          */
  153         param = thunk;
  154         if ((param->child_tid != NULL &&
  155             suword_lwpid(param->child_tid, td->td_tid)) ||
  156             (param->parent_tid != NULL &&
  157             suword_lwpid(param->parent_tid, td->td_tid)))
  158                 return (EFAULT);
  159 
  160         /* Set up our machine context. */
  161         stack.ss_sp = param->stack_base;
  162         stack.ss_size = param->stack_size;
  163         /* Set upcall address to user thread entry function. */
  164         cpu_set_upcall_kse(td, param->start_func, param->arg, &stack);
  165         /* Setup user TLS address and TLS pointer register. */
  166         return (cpu_set_user_tls(td, param->tls_base));
  167 }
  168 
  169 int
  170 kern_thr_new(struct thread *td, struct thr_param *param)
  171 {
  172         struct rtprio rtp, *rtpp;
  173         int error;
  174 
  175         rtpp = NULL;
  176         if (param->rtp != 0) {
  177                 error = copyin(param->rtp, &rtp, sizeof(struct rtprio));
  178                 if (error)
  179                         return (error);
  180                 rtpp = &rtp;
  181         }
  182         return (thread_create(td, rtpp, thr_new_initthr, param));
  183 }
  184 
  185 int
  186 thread_create(struct thread *td, struct rtprio *rtp,
  187     int (*initialize_thread)(struct thread *, void *), void *thunk)
  188 {
  189         struct thread *newtd;
  190         struct proc *p;
  191         int error;
  192 
  193         p = td->td_proc;
  194 
  195         if (rtp != NULL) {
  196                 switch(rtp->type) {
  197                 case RTP_PRIO_REALTIME:
  198                 case RTP_PRIO_FIFO:
  199                         /* Only root can set scheduler policy */
  200                         if (priv_check(td, PRIV_SCHED_SETPOLICY) != 0)
  201                                 return (EPERM);
  202                         if (rtp->prio > RTP_PRIO_MAX)
  203                                 return (EINVAL);
  204                         break;
  205                 case RTP_PRIO_NORMAL:
  206                         rtp->prio = 0;
  207                         break;
  208                 default:
  209                         return (EINVAL);
  210                 }
  211         }
  212 
  213 #ifdef RACCT
  214         PROC_LOCK(td->td_proc);
  215         error = racct_add(p, RACCT_NTHR, 1);
  216         PROC_UNLOCK(td->td_proc);
  217         if (error != 0)
  218                 return (EPROCLIM);
  219 #endif
  220 
  221         /* Initialize our td */
  222         error = kern_thr_alloc(p, 0, &newtd);
  223         if (error)
  224                 goto fail;
  225 
  226         cpu_set_upcall(newtd, td);
  227 
  228         bzero(&newtd->td_startzero,
  229             __rangeof(struct thread, td_startzero, td_endzero));
  230         newtd->td_su = NULL;
  231         bcopy(&td->td_startcopy, &newtd->td_startcopy,
  232             __rangeof(struct thread, td_startcopy, td_endcopy));
  233         newtd->td_proc = td->td_proc;
  234         newtd->td_ucred = crhold(td->td_ucred);
  235         newtd->td_dbg_sc_code = td->td_dbg_sc_code;
  236         newtd->td_dbg_sc_narg = td->td_dbg_sc_narg;
  237 
  238         error = initialize_thread(newtd, thunk);
  239         if (error != 0) {
  240                 thread_free(newtd);
  241                 crfree(td->td_ucred);
  242                 goto fail;
  243         }
  244 
  245         PROC_LOCK(td->td_proc);
  246         td->td_proc->p_flag |= P_HADTHREADS;
  247         thread_link(newtd, p); 
  248         bcopy(p->p_comm, newtd->td_name, sizeof(newtd->td_name));
  249         thread_lock(td);
  250         /* let the scheduler know about these things. */
  251         sched_fork_thread(td, newtd);
  252         thread_unlock(td);
  253         if (P_SHOULDSTOP(p))
  254                 newtd->td_flags |= TDF_ASTPENDING | TDF_NEEDSUSPCHK;
  255         PROC_UNLOCK(p);
  256 
  257         tidhash_add(newtd);
  258 
  259         thread_lock(newtd);
  260         if (rtp != NULL) {
  261                 if (!(td->td_pri_class == PRI_TIMESHARE &&
  262                       rtp->type == RTP_PRIO_NORMAL)) {
  263                         rtp_to_pri(rtp, newtd);
  264                         sched_prio(newtd, newtd->td_user_pri);
  265                 } /* ignore timesharing class */
  266         }
  267         TD_SET_CAN_RUN(newtd);
  268         sched_add(newtd, SRQ_BORING);
  269         thread_unlock(newtd);
  270 
  271         return (0);
  272 
  273 fail:
  274 #ifdef RACCT
  275         if (racct_enable) {
  276                 PROC_LOCK(p);
  277                 racct_sub(p, RACCT_NTHR, 1);
  278                 PROC_UNLOCK(p);
  279         }
  280 #endif
  281         return (error);
  282 }
  283 
  284 int
  285 sys_thr_self(struct thread *td, struct thr_self_args *uap)
  286     /* long *id */
  287 {
  288         int error;
  289 
  290         error = suword_lwpid(uap->id, (unsigned)td->td_tid);
  291         if (error == -1)
  292                 return (EFAULT);
  293         return (0);
  294 }
  295 
  296 int
  297 sys_thr_exit(struct thread *td, struct thr_exit_args *uap)
  298     /* long *state */
  299 {
  300 
  301         /* Signal userland that it can free the stack. */
  302         if ((void *)uap->state != NULL) {
  303                 suword_lwpid(uap->state, 1);
  304                 kern_umtx_wake(td, uap->state, INT_MAX, 0);
  305         }
  306 
  307         return (kern_thr_exit(td));
  308 }
  309 
  310 int
  311 kern_thr_exit(struct thread *td)
  312 {
  313         struct proc *p;
  314 
  315         p = td->td_proc;
  316 
  317         rw_wlock(&tidhash_lock);
  318         PROC_LOCK(p);
  319 
  320         if (p->p_numthreads != 1) {
  321                 racct_sub(p, RACCT_NTHR, 1);
  322                 LIST_REMOVE(td, td_hash);
  323                 rw_wunlock(&tidhash_lock);
  324                 tdsigcleanup(td);
  325                 umtx_thread_exit(td);
  326                 PROC_SLOCK(p);
  327                 thread_stopped(p);
  328                 thread_exit();
  329                 /* NOTREACHED */
  330         }
  331 
  332         /*
  333          * Ignore attempts to shut down last thread in the proc.  This
  334          * will actually call _exit(2) in the usermode trampoline when
  335          * it returns.
  336          */
  337         PROC_UNLOCK(p);
  338         rw_wunlock(&tidhash_lock);
  339         return (0);
  340 }
  341 
  342 int
  343 sys_thr_kill(struct thread *td, struct thr_kill_args *uap)
  344     /* long id, int sig */
  345 {
  346         ksiginfo_t ksi;
  347         struct thread *ttd;
  348         struct proc *p;
  349         int error;
  350 
  351         p = td->td_proc;
  352         ksiginfo_init(&ksi);
  353         ksi.ksi_signo = uap->sig;
  354         ksi.ksi_code = SI_LWP;
  355         ksi.ksi_pid = p->p_pid;
  356         ksi.ksi_uid = td->td_ucred->cr_ruid;
  357         if (uap->id == -1) {
  358                 if (uap->sig != 0 && !_SIG_VALID(uap->sig)) {
  359                         error = EINVAL;
  360                 } else {
  361                         error = ESRCH;
  362                         PROC_LOCK(p);
  363                         FOREACH_THREAD_IN_PROC(p, ttd) {
  364                                 if (ttd != td) {
  365                                         error = 0;
  366                                         if (uap->sig == 0)
  367                                                 break;
  368                                         tdksignal(ttd, uap->sig, &ksi);
  369                                 }
  370                         }
  371                         PROC_UNLOCK(p);
  372                 }
  373         } else {
  374                 error = 0;
  375                 ttd = tdfind((lwpid_t)uap->id, p->p_pid);
  376                 if (ttd == NULL)
  377                         return (ESRCH);
  378                 if (uap->sig == 0)
  379                         ;
  380                 else if (!_SIG_VALID(uap->sig))
  381                         error = EINVAL;
  382                 else 
  383                         tdksignal(ttd, uap->sig, &ksi);
  384                 PROC_UNLOCK(ttd->td_proc);
  385         }
  386         return (error);
  387 }
  388 
  389 int
  390 sys_thr_kill2(struct thread *td, struct thr_kill2_args *uap)
  391     /* pid_t pid, long id, int sig */
  392 {
  393         ksiginfo_t ksi;
  394         struct thread *ttd;
  395         struct proc *p;
  396         int error;
  397 
  398         AUDIT_ARG_SIGNUM(uap->sig);
  399 
  400         ksiginfo_init(&ksi);
  401         ksi.ksi_signo = uap->sig;
  402         ksi.ksi_code = SI_LWP;
  403         ksi.ksi_pid = td->td_proc->p_pid;
  404         ksi.ksi_uid = td->td_ucred->cr_ruid;
  405         if (uap->id == -1) {
  406                 if ((p = pfind(uap->pid)) == NULL)
  407                         return (ESRCH);
  408                 AUDIT_ARG_PROCESS(p);
  409                 error = p_cansignal(td, p, uap->sig);
  410                 if (error) {
  411                         PROC_UNLOCK(p);
  412                         return (error);
  413                 }
  414                 if (uap->sig != 0 && !_SIG_VALID(uap->sig)) {
  415                         error = EINVAL;
  416                 } else {
  417                         error = ESRCH;
  418                         FOREACH_THREAD_IN_PROC(p, ttd) {
  419                                 if (ttd != td) {
  420                                         error = 0;
  421                                         if (uap->sig == 0)
  422                                                 break;
  423                                         tdksignal(ttd, uap->sig, &ksi);
  424                                 }
  425                         }
  426                 }
  427                 PROC_UNLOCK(p);
  428         } else {
  429                 ttd = tdfind((lwpid_t)uap->id, uap->pid);
  430                 if (ttd == NULL)
  431                         return (ESRCH);
  432                 p = ttd->td_proc;
  433                 AUDIT_ARG_PROCESS(p);
  434                 error = p_cansignal(td, p, uap->sig);
  435                 if (uap->sig == 0)
  436                         ;
  437                 else if (!_SIG_VALID(uap->sig))
  438                         error = EINVAL;
  439                 else
  440                         tdksignal(ttd, uap->sig, &ksi);
  441                 PROC_UNLOCK(p);
  442         }
  443         return (error);
  444 }
  445 
  446 int
  447 sys_thr_suspend(struct thread *td, struct thr_suspend_args *uap)
  448         /* const struct timespec *timeout */
  449 {
  450         struct timespec ts, *tsp;
  451         int error;
  452 
  453         tsp = NULL;
  454         if (uap->timeout != NULL) {
  455                 error = umtx_copyin_timeout(uap->timeout, &ts);
  456                 if (error != 0)
  457                         return (error);
  458                 tsp = &ts;
  459         }
  460 
  461         return (kern_thr_suspend(td, tsp));
  462 }
  463 
  464 int
  465 kern_thr_suspend(struct thread *td, struct timespec *tsp)
  466 {
  467         struct proc *p = td->td_proc;
  468         struct timeval tv;
  469         int error = 0;
  470         int timo = 0;
  471 
  472         if (td->td_pflags & TDP_WAKEUP) {
  473                 td->td_pflags &= ~TDP_WAKEUP;
  474                 return (0);
  475         }
  476 
  477         if (tsp != NULL) {
  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 #ifdef KTR
  554         sched_clear_tdname(ttd);
  555 #endif
  556         PROC_UNLOCK(p);
  557         return (error);
  558 }
  559 
  560 int
  561 kern_thr_alloc(struct proc *p, int pages, struct thread **ntd)
  562 {
  563 
  564         /* Have race condition but it is cheap. */
  565         if (p->p_numthreads >= max_threads_per_proc) {
  566                 ++max_threads_hits;
  567                 return (EPROCLIM);
  568         }
  569 
  570         *ntd = thread_alloc(pages);
  571         if (*ntd == NULL)
  572                 return (ENOMEM);
  573 
  574         return (0);
  575 }
Cache object: 199dc6f5a7094c59819d02a5c9586f43
[ 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
