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/5.2/sys/kern/kern_thr.c 118893 2003-08-14 03:56:24Z grehan $");
   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         cpu_throw(td, choosethread());
  115 }
  116 
  117 #define RANGEOF(type, start, end) (offsetof(type, end) - offsetof(type, start))
  118 
  119 /*
  120  * System call interface.
  121  */
  122 int
  123 thr_create(struct thread *td, struct thr_create_args *uap)
  124     /* ucontext_t *ctx, thr_id_t *id, int flags */
  125 {
  126         struct kse *ke0;
  127         struct thread *td0;
  128         ucontext_t ctx;
  129         int error;
  130 
  131         if ((error = copyin(uap->ctx, &ctx, sizeof(ctx))))
  132                 return (error);
  133 
  134         /* Initialize our td. */
  135         td0 = thread_alloc();
  136 
  137         /*
  138          * Try the copyout as soon as we allocate the td so we don't have to
  139          * tear things down in a failure case below.
  140          */
  141         if ((error = copyout(&td0, uap->id, sizeof(thr_id_t)))) {
  142                 thread_free(td0);
  143                 return (error);
  144         }
  145 
  146         bzero(&td0->td_startzero,
  147             (unsigned)RANGEOF(struct thread, td_startzero, td_endzero));
  148         bcopy(&td->td_startcopy, &td0->td_startcopy,
  149             (unsigned) RANGEOF(struct thread, td_startcopy, td_endcopy));
  150 
  151         td0->td_proc = td->td_proc;
  152         PROC_LOCK(td->td_proc);
  153         td0->td_sigmask = td->td_sigmask;
  154         PROC_UNLOCK(td->td_proc);
  155         td0->td_ucred = crhold(td->td_ucred);
  156 
  157         /* Initialize our kse structure. */
  158         ke0 = kse_alloc();
  159         bzero(&ke0->ke_startzero,
  160             RANGEOF(struct kse, ke_startzero, ke_endzero));
  161 
  162         /* Set up our machine context. */
  163         cpu_set_upcall(td0, td);
  164         error = set_mcontext(td0, &ctx.uc_mcontext);
  165         if (error != 0) {
  166                 kse_free(ke0);
  167                 thread_free(td0);
  168                 goto out;
  169         } 
  170 
  171         /* Link the thread and kse into the ksegrp and make it runnable. */
  172         mtx_lock_spin(&sched_lock);
  173 
  174         thread_link(td0, td->td_ksegrp);
  175         kse_link(ke0, td->td_ksegrp);
  176 
  177         /* Bind this thread and kse together. */
  178         td0->td_kse = ke0;
  179         ke0->ke_thread = td0;
  180 
  181         sched_fork_kse(td->td_kse, ke0);
  182         sched_fork_thread(td, td0);
  183 
  184         TD_SET_CAN_RUN(td0);
  185         if ((uap->flags & THR_SUSPENDED) == 0)
  186                 setrunqueue(td0);
  187 
  188         mtx_unlock_spin(&sched_lock);
  189 
  190 out:
  191         return (error);
  192 }
  193 
  194 int
  195 thr_self(struct thread *td, struct thr_self_args *uap)
  196     /* thr_id_t *id */
  197 {
  198         int error;
  199 
  200         if ((error = copyout(&td, uap->id, sizeof(thr_id_t))))
  201                 return (error);
  202 
  203         return (0);
  204 }
  205 
  206 int
  207 thr_exit(struct thread *td, struct thr_exit_args *uap)
  208     /* NULL */
  209 {
  210         struct proc *p;
  211 
  212         p = td->td_proc;
  213 
  214         PROC_LOCK(p);
  215         mtx_lock_spin(&sched_lock);
  216 
  217         /*
  218          * This unlocks proc and doesn't return unless this is the last
  219          * thread.
  220          */
  221         thr_exit1();
  222         mtx_unlock_spin(&sched_lock);
  223 
  224         return (0);
  225 }
  226 
  227 int
  228 thr_kill(struct thread *td, struct thr_kill_args *uap)
  229     /* thr_id_t id, int sig */
  230 {
  231         struct thread *ttd;
  232         struct proc *p;
  233         int error;
  234 
  235         p = td->td_proc;
  236         error = 0;
  237         PROC_LOCK(p);
  238         FOREACH_THREAD_IN_PROC(p, ttd) {
  239                 if (ttd == uap->id)
  240                         break;
  241         }
  242         if (ttd == NULL) {
  243                 error = ESRCH;
  244                 goto out;
  245         }
  246         if (uap->sig == 0)
  247                 goto out;
  248         if (!_SIG_VALID(uap->sig)) {
  249                 error = EINVAL;
  250                 goto out;
  251         }
  252         tdsignal(ttd, uap->sig, SIGTARGET_TD);
  253 out:
  254         PROC_UNLOCK(p);
  255         return (error);
  256 }

Cache object: 8a8679982391485077785a489175e1bc

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

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sys/kern/kern_thr.c