thr_exit.c revision 178806 
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 178806 2008-05-06 07:27:11Z 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 "un-namespace.h"
38
39#include "thr_private.h"
40
41void	_pthread_exit(void *status);
42
43__weak_reference(_pthread_exit, pthread_exit);
44
45void
46_thread_exit(const char *fname, int lineno, const char *msg)
47{
48
49	/* Write an error message to the standard error file descriptor: */
50	_thread_printf(2,
51	    "Fatal error '%s' at line %d in file %s (errno = %d)\n",
52	    msg, lineno, fname, errno);
53
54	abort();
55}
56
57/*
58 * Only called when a thread is cancelled.  It may be more useful
59 * to call it from pthread_exit() if other ways of asynchronous or
60 * abnormal thread termination can be found.
61 */
62void
63_thr_exit_cleanup(void)
64{
65}
66
67void
68_pthread_exit(void *status)
69{
70	struct pthread *curthread = _get_curthread();
71
72	/* Check if this thread is already in the process of exiting: */
73	if (curthread->cancelling) {
74		char msg[128];
75		snprintf(msg, sizeof(msg), "Thread %p has called "
76		    "pthread_exit() from a destructor. POSIX 1003.1 "
77		    "1996 s16.2.5.2 does not allow this!", curthread);
78		PANIC(msg);
79	}
80
81	/* Flag this thread as exiting. */
82	curthread->cancelling = 1;
83
84	_thr_exit_cleanup();
85
86	/* Save the return value: */
87	curthread->ret = status;
88	while (curthread->cleanup != NULL) {
89		_pthread_cleanup_pop(1);
90	}
91
92	/* Check if there is thread specific data: */
93	if (curthread->specific != NULL) {
94		/* Run the thread-specific data destructors: */
95		_thread_cleanupspecific();
96	}
97
98	if (!_thr_isthreaded())
99		exit(0);
100
101	THREAD_LIST_LOCK(curthread);
102	_thread_active_threads--;
103	if (_thread_active_threads == 0) {
104		THREAD_LIST_UNLOCK(curthread);
105		exit(0);
106		/* Never reach! */
107	}
108	THR_LOCK(curthread);
109	curthread->state = PS_DEAD;
110	if (curthread->flags & THR_FLAGS_NEED_SUSPEND) {
111		curthread->cycle++;
112		_thr_umtx_wake(&curthread->cycle, INT_MAX, 0);
113	}
114	THR_UNLOCK(curthread);
115	/*
116	 * Thread was created with initial refcount 1, we drop the
117	 * reference count to allow it to be garbage collected.
118	 */
119	curthread->refcount--;
120	if (curthread->tlflags & TLFLAGS_DETACHED)
121		THR_GCLIST_ADD(curthread);
122	THREAD_LIST_UNLOCK(curthread);
123	if (!curthread->force_exit && SHOULD_REPORT_EVENT(curthread, TD_DEATH))
124		_thr_report_death(curthread);
125
126	/*
127	 * Kernel will do wakeup at the address, so joiner thread
128	 * will be resumed if it is sleeping at the address.
129	 */
130	thr_exit(&curthread->tid);
131	PANIC("thr_exit() returned");
132	/* Never reach! */
133}
134