1 /*-
2 * Copyright (c) 2011 David Chisnall
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 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD$
27 */
28
29 #include <sys/types.h>
30 #include <machine/atomic.h>
31 #include <stdlib.h>
32 #include <pthread.h>
33
34 /**
35 * Linked list of quick exit handlers. This is simpler than the atexit()
36 * version, because it is not required to support C++ destructors or
37 * DSO-specific cleanups.
38 */
39 struct quick_exit_handler {
40 struct quick_exit_handler *next;
41 void (*cleanup)(void);
42 };
43
44 /**
45 * Lock protecting the handlers list.
46 */
47 static pthread_mutex_t atexit_mutex = PTHREAD_MUTEX_INITIALIZER;
48 /**
49 * Stack of cleanup handlers. These will be invoked in reverse order when
50 */
51 static struct quick_exit_handler *handlers;
52
53 int
at_quick_exit(void (* func)(void))54 at_quick_exit(void (*func)(void))
55 {
56 struct quick_exit_handler *h;
57
58 h = malloc(sizeof(*h));
59
60 if (NULL == h)
61 return (1);
62 h->cleanup = func;
63 pthread_mutex_lock(&atexit_mutex);
64 h->next = handlers;
65 __compiler_membar();
66 handlers = h;
67 pthread_mutex_unlock(&atexit_mutex);
68 return (0);
69 }
70
71 void
quick_exit(int status)72 quick_exit(int status)
73 {
74 struct quick_exit_handler *h;
75
76 /*
77 * XXX: The C++ spec requires us to call std::terminate if there is an
78 * exception here.
79 */
80 for (h = handlers; NULL != h; h = h->next) {
81 __compiler_membar();
82 h->cleanup();
83 }
84 _Exit(status);
85 }
86