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 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 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