thr_exit.c revision 212076 
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 212076 2010-09-01 02:18:33Z davidxu $
30 */
31
32#include "namespace.h"
33#include <errno.h>
34#include <stdio.h>
35#include <stdlib.h>
36#include <pthread.h>
37#include <sys/types.h>
38#include <sys/signalvar.h>
39#include "un-namespace.h"
40
41#include "libc_private.h"
42#include "thr_private.h"
43
44void	_pthread_exit(void *status);
45
46__weak_reference(_pthread_exit, pthread_exit);
47
48void
49_thread_exit(const char *fname, int lineno, const char *msg)
50{
51
52	/* Write an error message to the standard error file descriptor: */
53	_thread_printf(2,
54	    "Fatal error '%s' at line %d in file %s (errno = %d)\n",
55	    msg, lineno, fname, errno);
56
57	abort();
58}
59
60void
61_pthread_exit(void *status)
62{
63	_pthread_exit_mask(status, NULL);
64}
65
66void
67_pthread_exit_mask(void *status, sigset_t *mask)
68{
69	struct pthread *curthread = _get_curthread();
70
71	/* Check if this thread is already in the process of exiting: */
72	if (curthread->cancelling) {
73		char msg[128];
74		snprintf(msg, sizeof(msg), "Thread %p has called "
75		    "pthread_exit() from a destructor. POSIX 1003.1 "
76		    "1996 s16.2.5.2 does not allow this!", curthread);
77		PANIC(msg);
78	}
79
80	/* Flag this thread as exiting. */
81	curthread->cancelling = 1;
82	curthread->cancel_enable = 0;
83	curthread->cancel_async = 0;
84	curthread->cancel_point = 0;
85	if (mask != NULL)
86		__sys_sigprocmask(SIG_SETMASK, mask, NULL);
87	if (curthread->unblock_sigcancel) {
88		sigset_t set;
89
90		curthread->unblock_sigcancel = 0;
91		SIGEMPTYSET(set);
92		SIGADDSET(set, SIGCANCEL);
93		__sys_sigprocmask(SIG_UNBLOCK, mask, NULL);
94	}
95
96	/* Save the return value: */
97	curthread->ret = status;
98	while (curthread->cleanup != NULL) {
99		_pthread_cleanup_pop(1);
100	}
101
102	/* Check if there is thread specific data: */
103	if (curthread->specific != NULL) {
104		/* Run the thread-specific data destructors: */
105		_thread_cleanupspecific();
106	}
107
108	if (!_thr_isthreaded())
109		exit(0);
110
111	THREAD_LIST_LOCK(curthread);
112	_thread_active_threads--;
113	if (_thread_active_threads == 0) {
114		THREAD_LIST_UNLOCK(curthread);
115		exit(0);
116		/* Never reach! */
117	}
118	THREAD_LIST_UNLOCK(curthread);
119
120	/* Tell malloc that the thread is exiting. */
121	_malloc_thread_cleanup();
122
123	THREAD_LIST_LOCK(curthread);
124	THR_LOCK(curthread);
125	curthread->state = PS_DEAD;
126	if (curthread->flags & THR_FLAGS_NEED_SUSPEND) {
127		curthread->cycle++;
128		_thr_umtx_wake(&curthread->cycle, INT_MAX, 0);
129	}
130	THR_UNLOCK(curthread);
131	/*
132	 * Thread was created with initial refcount 1, we drop the
133	 * reference count to allow it to be garbage collected.
134	 */
135	curthread->refcount--;
136	if (curthread->tlflags & TLFLAGS_DETACHED)
137		THR_GCLIST_ADD(curthread);
138	THREAD_LIST_UNLOCK(curthread);
139	if (!curthread->force_exit && SHOULD_REPORT_EVENT(curthread, TD_DEATH))
140		_thr_report_death(curthread);
141
142	/*
143	 * Kernel will do wakeup at the address, so joiner thread
144	 * will be resumed if it is sleeping at the address.
145	 */
146	thr_exit(&curthread->tid);
147	PANIC("thr_exit() returned");
148	/* Never reach! */
149}
150