lib/libthread_xu/thread/thr_exit.c

   1 /*
   2  * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
   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, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by John Birrell.
  16  * 4. Neither the name of the author nor the names of any co-contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * $FreeBSD: src/lib/libpthread/thread/thr_exit.c,v 1.39 2004/10/23 23:37:54 davidxu Exp $
  33  * $DragonFly: src/lib/libthread_xu/thread/thr_exit.c,v 1.9 2007/03/13 00:19:29 corecode Exp $
  34  */
  35
  36 #include "namespace.h"
  37 #include <machine/tls.h>
  38
  39 #include <errno.h>
  40 #include <unistd.h>
  41 #include <fcntl.h>
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45 #include <pthread.h>
  46 #include "un-namespace.h"
  47
  48 #include "thr_private.h"
  49
  50 void
  51 _thread_exit(const char *fname, int lineno, const char *msg)
  52 {
  53
  54         /* Write an error message to the standard error file descriptor: */
  55         _thread_printf(2,
  56             "Fatal error '%s' at line %d in file %s (errno = %d)\n",
  57             msg, lineno, fname, errno);
  58
  59         abort();
  60 }
  61
  62 /*
  63  * Only called when a thread is cancelled.  It may be more useful
  64  * to call it from pthread_exit() if other ways of asynchronous or
  65  * abnormal thread termination can be found.
  66  */
  67 void
  68 _thr_exit_cleanup(void)
  69 {
  70         struct pthread  *curthread = tls_get_curthread();
  71
  72         /*
  73          * POSIX states that cancellation/termination of a thread should
  74          * not release any visible resources (such as mutexes) and that
  75          * it is the applications responsibility.  Resources that are
  76          * internal to the threads library, including file and fd locks,
  77          * are not visible to the application and need to be released.
  78          */
  79         /* Unlock all private mutexes: */
  80         _mutex_unlock_private(curthread);
  81
  82         /*
  83          * This still isn't quite correct because we don't account
  84          * for held spinlocks (see libc/stdlib/malloc.c).
  85          */
  86 }
  87
  88 void
  89 _pthread_exit(void *status)
  90 {
  91         struct pthread *curthread = tls_get_curthread();
  92
  93         /* Check if this thread is already in the process of exiting: */
  94         if ((curthread->cancelflags & THR_CANCEL_EXITING) != 0) {
  95                 char msg[128];
  96                 snprintf(msg, sizeof(msg), "Thread %p has called "
  97                     "pthread_exit() from a destructor. POSIX 1003.1 "
  98                     "1996 s16.2.5.2 does not allow this!", curthread);
  99                 PANIC(msg);
 100         }
 101
 102         /* Flag this thread as exiting. */
 103         atomic_set_int(&curthread->cancelflags, THR_CANCEL_EXITING);
 104
 105         _thr_exit_cleanup();
 106
 107         /* Save the return value: */
 108         curthread->ret = status;
 109         while (curthread->cleanup != NULL) {
 110                 _pthread_cleanup_pop(1);
 111         }
 112
 113         /* Check if there is thread specific data: */
 114         if (curthread->specific != NULL) {
 115                 /* Run the thread-specific data destructors: */
 116                 _thread_cleanupspecific();
 117         }
 118
 119         if (!_thr_isthreaded())
 120                 exit(0);
 121
 122         THREAD_LIST_LOCK(curthread);
 123         _thread_active_threads--;
 124         if (_thread_active_threads == 0) {
 125                 THREAD_LIST_UNLOCK(curthread);
 126                 exit(0);
 127                 /* Never reach! */
 128         }
 129         THR_LOCK(curthread);
 130         curthread->state = PS_DEAD;
 131         THR_UNLOCK(curthread);
 132         curthread->refcount--;
 133         if (curthread->tlflags & TLFLAGS_DETACHED)
 134                 THR_GCLIST_ADD(curthread);
 135         THREAD_LIST_UNLOCK(curthread);
 136         if (curthread->joiner)
 137                 _thr_umtx_wake(&curthread->state, INT_MAX);
 138         if (SHOULD_REPORT_EVENT(curthread, TD_DEATH))
 139                 _thr_report_death(curthread);
 140         /* Exit and set terminated to once we're really dead. */
 141         extexit(EXTEXIT_SETINT|EXTEXIT_LWP, 1, &curthread->terminated);
 142         PANIC("thr_exit() returned");
 143         /* Never reach! */
 144 }
 145
 146 __strong_reference(_pthread_exit, pthread_exit);