1 /* 2 * Copyright (c) 2005, David Xu <davidxu@freebsd.org> 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 unmodified, this list of conditions, and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 * 28 */ 29 30 #include "namespace.h" 31 #include <pthread.h> 32 #include "un-namespace.h" 33 34 #include "thr_private.h" 35 36 __weak_reference(_pthread_cancel, pthread_cancel); 37 __weak_reference(_pthread_setcancelstate, pthread_setcancelstate); 38 __weak_reference(_pthread_setcanceltype, pthread_setcanceltype); 39 __weak_reference(_pthread_testcancel, pthread_testcancel); 40 41 static inline void 42 testcancel(struct pthread *curthread) 43 { 44 if (__predict_false(SHOULD_CANCEL(curthread) && 45 !THR_IN_CRITICAL(curthread))) 46 _pthread_exit(PTHREAD_CANCELED); 47 } 48 49 void 50 _thr_testcancel(struct pthread *curthread) 51 { 52 testcancel(curthread); 53 } 54 55 int 56 _pthread_cancel(pthread_t pthread) 57 { 58 struct pthread *curthread = _get_curthread(); 59 int ret; 60 61 /* 62 * POSIX says _pthread_cancel should be async cancellation safe. 63 * _thr_find_thread and THR_THREAD_UNLOCK will enter and leave critical 64 * region automatically. 65 */ 66 if ((ret = _thr_find_thread(curthread, pthread, 0)) == 0) { 67 if (!pthread->cancel_pending) { 68 pthread->cancel_pending = 1; 69 if (pthread->state != PS_DEAD) 70 _thr_send_sig(pthread, SIGCANCEL); 71 } 72 THR_THREAD_UNLOCK(curthread, pthread); 73 } 74 return (ret); 75 } 76 77 int 78 _pthread_setcancelstate(int state, int *oldstate) 79 { 80 struct pthread *curthread = _get_curthread(); 81 int oldval; 82 83 oldval = curthread->cancel_enable; 84 switch (state) { 85 case PTHREAD_CANCEL_DISABLE: 86 curthread->cancel_enable = 0; 87 break; 88 case PTHREAD_CANCEL_ENABLE: 89 curthread->cancel_enable = 1; 90 testcancel(curthread); 91 break; 92 default: 93 return (EINVAL); 94 } 95 96 if (oldstate) { 97 *oldstate = oldval ? PTHREAD_CANCEL_ENABLE : 98 PTHREAD_CANCEL_DISABLE; 99 } 100 return (0); 101 } 102 103 int 104 _pthread_setcanceltype(int type, int *oldtype) 105 { 106 struct pthread *curthread = _get_curthread(); 107 int oldval; 108 109 oldval = curthread->cancel_async; 110 switch (type) { 111 case PTHREAD_CANCEL_ASYNCHRONOUS: 112 curthread->cancel_async = 1; 113 testcancel(curthread); 114 break; 115 case PTHREAD_CANCEL_DEFERRED: 116 curthread->cancel_async = 0; 117 break; 118 default: 119 return (EINVAL); 120 } 121 122 if (oldtype) { 123 *oldtype = oldval ? PTHREAD_CANCEL_ASYNCHRONOUS : 124 PTHREAD_CANCEL_DEFERRED; 125 } 126 return (0); 127 } 128 129 void 130 _pthread_testcancel(void) 131 { 132 struct pthread *curthread = _get_curthread(); 133 134 testcancel(curthread); 135 } 136 137 void 138 _thr_cancel_enter(struct pthread *curthread) 139 { 140 curthread->cancel_point = 1; 141 testcancel(curthread); 142 } 143 144 void 145 _thr_cancel_enter2(struct pthread *curthread, int maycancel) 146 { 147 curthread->cancel_point = 1; 148 if (__predict_false(SHOULD_CANCEL(curthread) && 149 !THR_IN_CRITICAL(curthread))) { 150 if (!maycancel) 151 thr_wake(curthread->tid); 152 else 153 _pthread_exit(PTHREAD_CANCELED); 154 } 155 } 156 157 void 158 _thr_cancel_leave(struct pthread *curthread, int maycancel) 159 { 160 curthread->cancel_point = 0; 161 if (__predict_false(SHOULD_CANCEL(curthread) && 162 !THR_IN_CRITICAL(curthread) && maycancel)) 163 _pthread_exit(PTHREAD_CANCELED); 164 } 165 166 void 167 _pthread_cancel_enter(int maycancel) 168 { 169 _thr_cancel_enter2(_get_curthread(), maycancel); 170 } 171 172 void 173 _pthread_cancel_leave(int maycancel) 174 { 175 _thr_cancel_leave(_get_curthread(), maycancel); 176 } 177