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  * $FreeBSD: releng/5.1/sys/kern/kern_thr.c 115084 2003-05-16 21:26:42Z marcel $
   27  *
   28  */
   29 
   30 #include <sys/param.h>
   31 #include <sys/kernel.h>
   32 #include <sys/lock.h>
   33 #include <sys/mutex.h>
   34 #include <sys/proc.h>
   35 #include <sys/resourcevar.h>
   36 #include <sys/sched.h>
   37 #include <sys/sysent.h>
   38 #include <sys/systm.h>
   39 #include <sys/sysproto.h>
   40 #include <sys/signalvar.h>
   41 #include <sys/ucontext.h>
   42 #include <sys/thr.h>
   43 
   44 #include <machine/frame.h>
   45 
   46 /*
   47  * Back end support functions.
   48  */
   49 
   50 void
   51 thr_exit1(void)
   52 {
   53         struct ksegrp *kg;
   54         struct thread *td;
   55         struct kse *ke;
   56         struct proc *p;
   57 
   58         td = curthread;
   59         p = td->td_proc;
   60         kg = td->td_ksegrp;
   61         ke = td->td_kse;
   62 
   63         mtx_assert(&sched_lock, MA_OWNED);
   64         PROC_LOCK_ASSERT(p, MA_OWNED);
   65         KASSERT(!mtx_owned(&Giant), ("dying thread owns giant"));
   66 
   67         /*
   68          * Shutting down last thread in the proc.  This will actually
   69          * call exit() in the trampoline when it returns.
   70          */
   71         if (p->p_numthreads == 1) {
   72                 PROC_UNLOCK(p);
   73                 return;
   74         }
   75 
   76         /*
   77          * XXX Undelivered process wide signals should be reposted to the
   78          * proc.
   79          */
   80 
   81         /* Clean up cpu resources. */
   82         cpu_thread_exit(td);
   83 
   84         /* XXX make thread_unlink() */
   85         TAILQ_REMOVE(&p->p_threads, td, td_plist);
   86         p->p_numthreads--;
   87         TAILQ_REMOVE(&kg->kg_threads, td, td_kglist);
   88         kg->kg_numthreads--;
   89 
   90         ke->ke_state = KES_UNQUEUED;
   91         ke->ke_thread = NULL;
   92         kse_unlink(ke);
   93         sched_exit_kse(TAILQ_NEXT(ke, ke_kglist), ke);
   94 
   95         /*
   96          * If we were stopped while waiting for all threads to exit and this
   97          * is the last thread wakeup the exiting thread.
   98          */
   99         if (P_SHOULDSTOP(p) == P_STOPPED_SINGLE)
  100                 if (p->p_numthreads == 1)
  101                         thread_unsuspend_one(p->p_singlethread);
  102 
  103         PROC_UNLOCK(p);
  104         td->td_kse = NULL;
  105         td->td_state = TDS_INACTIVE;
  106 #if 0
  107         td->td_proc = NULL;
  108 #endif
  109         td->td_ksegrp = NULL;
  110         td->td_last_kse = NULL;
  111         sched_exit_thread(TAILQ_NEXT(td, td_kglist), td);
  112         thread_stash(td);
  113 
  114 #if !defined(__alpha__) && !defined(__powerpc__) 
  115         cpu_throw(td, choosethread());
  116 #else
  117         cpu_throw();
  118 #endif
  119 }
  120 
  121 #define RANGEOF(type, start, end) (offsetof(type, end) - offsetof(type, start))
  122 
  123 /*
  124  * System call interface.
  125  */
  126 int
  127 thr_create(struct thread *td, struct thr_create_args *uap)
  128     /* ucontext_t *ctx, thr_id_t *id, int flags */
  129 {
  130         struct kse *ke0;
  131         struct thread *td0;
  132         ucontext_t ctx;
  133         int error;
  134 
  135         if ((error = copyin(uap->ctx, &ctx, sizeof(ctx))))
  136                 return (error);
  137 
  138         /* Initialize our td. */
  139         td0 = thread_alloc();
  140 
  141         /*
  142          * Try the copyout as soon as we allocate the td so we don't have to
  143          * tear things down in a failure case below.
  144          */
  145         if ((error = copyout(&td0, uap->id, sizeof(thr_id_t)))) {
  146                 thread_free(td0);
  147                 return (error);
  148         }
  149 
  150         bzero(&td0->td_startzero,
  151             (unsigned)RANGEOF(struct thread, td_startzero, td_endzero));
  152         bcopy(&td->td_startcopy, &td0->td_startcopy,
  153             (unsigned) RANGEOF(struct thread, td_startcopy, td_endcopy));
  154 
  155         td0->td_proc = td->td_proc;
  156         PROC_LOCK(td->td_proc);
  157         td0->td_sigmask = td->td_sigmask;
  158         PROC_UNLOCK(td->td_proc);
  159         bcopy(td->td_frame, td0->td_frame, sizeof(struct trapframe));
  160         td0->td_ucred = crhold(td->td_ucred);
  161 
  162         /* Initialize our kse structure. */
  163         ke0 = kse_alloc();
  164         bzero(&ke0->ke_startzero,
  165             RANGEOF(struct kse, ke_startzero, ke_endzero));
  166 
  167         /* Set up our machine context. */
  168         cpu_set_upcall(td0, td->td_pcb);
  169         error = set_mcontext(td0, &ctx.uc_mcontext);
  170         if (error != 0) {
  171                 kse_free(ke0);
  172                 thread_free(td0);
  173                 goto out;
  174         } 
  175 
  176         /* Link the thread and kse into the ksegrp and make it runnable. */
  177         mtx_lock_spin(&sched_lock);
  178 
  179         thread_link(td0, td->td_ksegrp);
  180         kse_link(ke0, td->td_ksegrp);
  181 
  182         /* Bind this thread and kse together. */
  183         td0->td_kse = ke0;
  184         ke0->ke_thread = td0;
  185 
  186         sched_fork_kse(td->td_kse, ke0);
  187         sched_fork_thread(td, td0);
  188 
  189         TD_SET_CAN_RUN(td0);
  190         if ((uap->flags & THR_SUSPENDED) == 0)
  191                 setrunqueue(td0);
  192 
  193         mtx_unlock_spin(&sched_lock);
  194 
  195 out:
  196         return (error);
  197 }
  198 
  199 int
  200 thr_self(struct thread *td, struct thr_self_args *uap)
  201     /* thr_id_t *id */
  202 {
  203         int error;
  204 
  205         if ((error = copyout(&td, uap->id, sizeof(thr_id_t))))
  206                 return (error);
  207 
  208         return (0);
  209 }
  210 
  211 int
  212 thr_exit(struct thread *td, struct thr_exit_args *uap)
  213     /* NULL */
  214 {
  215         struct proc *p;
  216 
  217         p = td->td_proc;
  218 
  219         PROC_LOCK(p);
  220         mtx_lock_spin(&sched_lock);
  221 
  222         /*
  223          * This unlocks proc and doesn't return unless this is the last
  224          * thread.
  225          */
  226         thr_exit1();
  227         mtx_unlock_spin(&sched_lock);
  228 
  229         return (0);
  230 }
  231 
  232 int
  233 thr_kill(struct thread *td, struct thr_kill_args *uap)
  234     /* thr_id_t id, int sig */
  235 {
  236         struct thread *ttd;
  237         struct proc *p;
  238         int error;
  239 
  240         p = td->td_proc;
  241         error = 0;
  242 
  243         PROC_LOCK(p);
  244 
  245         FOREACH_THREAD_IN_PROC(p, ttd)
  246                 if (ttd == uap->id)
  247                         break;
  248 
  249         if (ttd == NULL) {
  250                 error = ESRCH;
  251                 goto out;
  252         }
  253 
  254         if (uap->sig == 0)
  255                 goto out;
  256 
  257         if (!_SIG_VALID(uap->sig)) {
  258                 error = EINVAL;
  259                 goto out;
  260         }
  261 
  262         /*
  263          * We need a way to force this to go into this thread's siglist.
  264          * Until then blocked signals will go to the proc.
  265          */
  266         tdsignal(ttd, uap->sig);
  267 out:
  268         PROC_UNLOCK(p);
  269 
  270         return (error);
  271 }

Cache object: 3f1d1bba84f409bb0317015562157893

[ 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