thr_exit.c revision 182894 
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. Neither the name of the author nor the names of any co-contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $FreeBSD: head/lib/libthr/thread/thr_exit.c 182894 2008-09-09 17:14:32Z jasone $
30 */
31
32#include "namespace.h"
33#include <errno.h>
34#include <stdio.h>
35#include <stdlib.h>
36#include <pthread.h>
37#include "un-namespace.h"
38
39#include "libc_private.h"
40#include "thr_private.h"
41
42void	_pthread_exit(void *status);
43
44__weak_reference(_pthread_exit, pthread_exit);
45
46void
47_thread_exit(const char *fname, int lineno, const char *msg)
48{
49
50	/* Write an error message to the standard error file descriptor: */
51	_thread_printf(2,
52	    "Fatal error '%s' at line %d in file %s (errno = %d)\n",
53	    msg, lineno, fname, errno);
54
55	abort();
56}
57
58/*
59 * Only called when a thread is cancelled.  It may be more useful
60 * to call it from pthread_exit() if other ways of asynchronous or
61 * abnormal thread termination can be found.
62 */
63void
64_thr_exit_cleanup(void)
65{
66}
67
68void
69_pthread_exit(void *status)
70{
71	struct pthread *curthread = _get_curthread();
72
73	/* Check if this thread is already in the process of exiting: */
74	if (curthread->cancelling) {
75		char msg[128];
76		snprintf(msg, sizeof(msg), "Thread %p has called "
77		    "pthread_exit() from a destructor. POSIX 1003.1 "
78		    "1996 s16.2.5.2 does not allow this!", curthread);
79		PANIC(msg);
80	}
81
82	/* Flag this thread as exiting. */
83	curthread->cancelling = 1;
84
85	_thr_exit_cleanup();
86
87	/* Save the return value: */
88	curthread->ret = status;
89	while (curthread->cleanup != NULL) {
90		_pthread_cleanup_pop(1);
91	}
92
93	/* Check if there is thread specific data: */
94	if (curthread->specific != NULL) {
95		/* Run the thread-specific data destructors: */
96		_thread_cleanupspecific();
97	}
98
99	if (!_thr_isthreaded())
100		exit(0);
101
102	THREAD_LIST_LOCK(curthread);
103	_thread_active_threads--;
104	if (_thread_active_threads == 0) {
105		THREAD_LIST_UNLOCK(curthread);
106		exit(0);
107		/* Never reach! */
108	}
109	THREAD_LIST_UNLOCK(curthread);
110
111	/* Tell malloc that the thread is exiting. */
112	_malloc_thread_cleanup();
113
114	THREAD_LIST_LOCK(curthread);
115	THR_LOCK(curthread);
116	curthread->state = PS_DEAD;
117	if (curthread->flags & THR_FLAGS_NEED_SUSPEND) {
118		curthread->cycle++;
119		_thr_umtx_wake(&curthread->cycle, INT_MAX, 0);
120	}
121	THR_UNLOCK(curthread);
122	/*
123	 * Thread was created with initial refcount 1, we drop the
124	 * reference count to allow it to be garbage collected.
125	 */
126	curthread->refcount--;
127	if (curthread->tlflags & TLFLAGS_DETACHED)
128		THR_GCLIST_ADD(curthread);
129	THREAD_LIST_UNLOCK(curthread);
130	if (!curthread->force_exit && SHOULD_REPORT_EVENT(curthread, TD_DEATH))
131		_thr_report_death(curthread);
132
133	/*
134	 * Kernel will do wakeup at the address, so joiner thread
135	 * will be resumed if it is sleeping at the address.
136	 */
137	thr_exit(&curthread->tid);
138	PANIC("thr_exit() returned");
139	/* Never reach! */
140}
141