1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2005, David Xu <davidxu@freebsd.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice unmodified, this list of conditions, and the following
12 * 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 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include "namespace.h"
30 #include <pthread.h>
31 #include "un-namespace.h"
32
33 #include "thr_private.h"
34
35 __weak_reference(_thr_cancel, pthread_cancel);
36 __weak_reference(_thr_cancel, _pthread_cancel);
37 __weak_reference(_thr_setcancelstate, pthread_setcancelstate);
38 __weak_reference(_thr_setcancelstate, _pthread_setcancelstate);
39 __weak_reference(_thr_setcanceltype, pthread_setcanceltype);
40 __weak_reference(_thr_setcanceltype, _pthread_setcanceltype);
41 __weak_reference(_Tthr_testcancel, pthread_testcancel);
42 __weak_reference(_Tthr_testcancel, _pthread_testcancel);
43 __weak_reference(_Tthr_cancel_enter, _pthread_cancel_enter);
44 __weak_reference(_Tthr_cancel_leave, _pthread_cancel_leave);
45
46 static inline void
testcancel(struct pthread * curthread)47 testcancel(struct pthread *curthread)
48 {
49 if (__predict_false(SHOULD_CANCEL(curthread) &&
50 !THR_IN_CRITICAL(curthread)))
51 _pthread_exit(PTHREAD_CANCELED);
52 }
53
54 void
_thr_testcancel(struct pthread * curthread)55 _thr_testcancel(struct pthread *curthread)
56 {
57 testcancel(curthread);
58 }
59
60 int
_thr_cancel(pthread_t pthread)61 _thr_cancel(pthread_t pthread)
62 {
63 struct pthread *curthread = _get_curthread();
64 int ret;
65
66 /*
67 * POSIX says _pthread_cancel should be async cancellation safe.
68 * _thr_find_thread and THR_THREAD_UNLOCK will enter and leave critical
69 * region automatically.
70 */
71 if ((ret = _thr_find_thread(curthread, pthread, 1)) == 0) {
72 if (!pthread->cancel_pending) {
73 pthread->cancel_pending = 1;
74 if (pthread->state != PS_DEAD)
75 _thr_send_sig(pthread, SIGCANCEL);
76 }
77 THR_THREAD_UNLOCK(curthread, pthread);
78 }
79 return (ret);
80 }
81
82 int
_thr_setcancelstate(int state,int * oldstate)83 _thr_setcancelstate(int state, int *oldstate)
84 {
85 struct pthread *curthread = _get_curthread();
86 int oldval;
87
88 oldval = curthread->cancel_enable;
89 switch (state) {
90 case PTHREAD_CANCEL_DISABLE:
91 curthread->cancel_enable = 0;
92 break;
93 case PTHREAD_CANCEL_ENABLE:
94 curthread->cancel_enable = 1;
95 if (curthread->cancel_async)
96 testcancel(curthread);
97 break;
98 default:
99 return (EINVAL);
100 }
101
102 if (oldstate) {
103 *oldstate = oldval ? PTHREAD_CANCEL_ENABLE :
104 PTHREAD_CANCEL_DISABLE;
105 }
106 return (0);
107 }
108
109 int
_thr_setcanceltype(int type,int * oldtype)110 _thr_setcanceltype(int type, int *oldtype)
111 {
112 struct pthread *curthread = _get_curthread();
113 int oldval;
114
115 oldval = curthread->cancel_async;
116 switch (type) {
117 case PTHREAD_CANCEL_ASYNCHRONOUS:
118 curthread->cancel_async = 1;
119 testcancel(curthread);
120 break;
121 case PTHREAD_CANCEL_DEFERRED:
122 curthread->cancel_async = 0;
123 break;
124 default:
125 return (EINVAL);
126 }
127
128 if (oldtype) {
129 *oldtype = oldval ? PTHREAD_CANCEL_ASYNCHRONOUS :
130 PTHREAD_CANCEL_DEFERRED;
131 }
132 return (0);
133 }
134
135 void
_Tthr_testcancel(void)136 _Tthr_testcancel(void)
137 {
138 struct pthread *curthread;
139
140 _thr_check_init();
141 curthread = _get_curthread();
142 testcancel(curthread);
143 }
144
145 void
_thr_cancel_enter(struct pthread * curthread)146 _thr_cancel_enter(struct pthread *curthread)
147 {
148 curthread->cancel_point = 1;
149 testcancel(curthread);
150 }
151
152 void
_thr_cancel_enter2(struct pthread * curthread,int maycancel)153 _thr_cancel_enter2(struct pthread *curthread, int maycancel)
154 {
155 curthread->cancel_point = 1;
156 if (__predict_false(SHOULD_CANCEL(curthread) &&
157 !THR_IN_CRITICAL(curthread))) {
158 if (!maycancel)
159 thr_wake(curthread->tid);
160 else
161 _pthread_exit(PTHREAD_CANCELED);
162 }
163 }
164
165 void
_thr_cancel_leave(struct pthread * curthread,int maycancel)166 _thr_cancel_leave(struct pthread *curthread, int maycancel)
167 {
168 curthread->cancel_point = 0;
169 if (__predict_false(SHOULD_CANCEL(curthread) &&
170 !THR_IN_CRITICAL(curthread) && maycancel))
171 _pthread_exit(PTHREAD_CANCELED);
172 }
173
174 void
_Tthr_cancel_enter(int maycancel)175 _Tthr_cancel_enter(int maycancel)
176 {
177 _thr_cancel_enter2(_get_curthread(), maycancel);
178 }
179
180 void
_Tthr_cancel_leave(int maycancel)181 _Tthr_cancel_leave(int maycancel)
182 {
183 _thr_cancel_leave(_get_curthread(), maycancel);
184 }
185