xref: /freebsd/lib/libthr/thread/thr_clean.c (revision 62cfcf62f627e5093fb37026a6d8c98e4d2ef04c)
1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
3  *
4 
5  * Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>.
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  * 3. Neither the name of the author nor the names of any co-contributors
17  *    may be used to endorse or promote products derived from this software
18  *    without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30  * SUCH DAMAGE.
31  */
32 
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
35 
36 #include "namespace.h"
37 #include <signal.h>
38 #include <errno.h>
39 #include <stdlib.h>
40 #include <pthread.h>
41 #include "un-namespace.h"
42 
43 #include "thr_private.h"
44 
45 #undef pthread_cleanup_push
46 #undef pthread_cleanup_pop
47 
48 /* old binary compatible interfaces */
49 __weak_reference(_thr_cleanup_pop, pthread_cleanup_pop);
50 __weak_reference(_thr_cleanup_pop, _pthread_cleanup_pop);
51 __weak_reference(_thr_cleanup_push, pthread_cleanup_push);
52 __weak_reference(_thr_cleanup_push, _pthread_cleanup_push);
53 
54 /* help static linking when libc symbols have preference */
55 __weak_reference(__thr_cleanup_push_imp, __pthread_cleanup_push_imp);
56 __weak_reference(__thr_cleanup_pop_imp, __pthread_cleanup_pop_imp);
57 
58 void
59 __thr_cleanup_push_imp(void (*routine)(void *), void *arg,
60     struct _pthread_cleanup_info *info)
61 {
62 	struct pthread	*curthread = _get_curthread();
63 	struct pthread_cleanup *newbuf;
64 
65 	newbuf = (void *)info;
66 	newbuf->routine = routine;
67 	newbuf->routine_arg = arg;
68 	newbuf->onheap = 0;
69 	newbuf->prev = curthread->cleanup;
70 	curthread->cleanup = newbuf;
71 }
72 
73 void
74 __thr_cleanup_pop_imp(int execute)
75 {
76 	struct pthread	*curthread = _get_curthread();
77 	struct pthread_cleanup *old;
78 
79 	if ((old = curthread->cleanup) != NULL) {
80 		curthread->cleanup = old->prev;
81 		if (execute)
82 			old->routine(old->routine_arg);
83 		if (old->onheap)
84 			free(old);
85 	}
86 }
87 
88 void
89 _thr_cleanup_push(void (*routine)(void *), void *arg)
90 {
91 	struct pthread	*curthread = _get_curthread();
92 	struct pthread_cleanup *newbuf;
93 #ifdef _PTHREAD_FORCED_UNWIND
94 	curthread->unwind_disabled = 1;
95 #endif
96 	if ((newbuf = (struct pthread_cleanup *)
97 	    malloc(sizeof(struct pthread_cleanup))) != NULL) {
98 		newbuf->routine = routine;
99 		newbuf->routine_arg = arg;
100 		newbuf->onheap = 1;
101 		newbuf->prev = curthread->cleanup;
102 		curthread->cleanup = newbuf;
103 	}
104 }
105 
106 void
107 _thr_cleanup_pop(int execute)
108 {
109 	__pthread_cleanup_pop_imp(execute);
110 }
111