1 /* 2 * Copyright (c) 2003 Jeffrey Roberson <jeff@freebsd.org> 3 * Copyright (c) 2003 Jonathan Mini <mini@freebsd.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice unmodified, this list of conditions, and the following 11 * disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 * 27 * $FreeBSD$ 28 */ 29 30 #include <sys/param.h> 31 #include <sys/types.h> 32 #include <sys/signalvar.h> 33 #include <signal.h> 34 #include <fcntl.h> 35 #include <unistd.h> 36 #include <setjmp.h> 37 #include <errno.h> 38 #include <pthread.h> 39 #include <stdlib.h> 40 41 #include "thr_private.h" 42 43 /* #define DEBUG_SIGNAL */ 44 #ifdef DEBUG_SIGNAL 45 #define DBG_MSG stdout_debug 46 #else 47 #define DBG_MSG(x...) 48 #endif 49 50 __weak_reference(_pthread_sigmask, pthread_sigmask); 51 52 int 53 _pthread_sigmask(int how, const sigset_t *set, sigset_t *oset) 54 { 55 int error; 56 57 /* 58 * This always sets the mask on the current thread. 59 */ 60 error = sigprocmask(how, set, oset); 61 62 /* 63 * pthread_sigmask returns errno or success while sigprocmask returns 64 * -1 and sets errno. 65 */ 66 if (error == -1) 67 error = errno; 68 69 return (error); 70 } 71 72 73 __weak_reference(_pthread_kill, pthread_kill); 74 75 int 76 _pthread_kill(pthread_t pthread, int sig) 77 { 78 int error; 79 80 if (sig < 0 || sig > NSIG) 81 return (EINVAL); 82 if (_thread_initial == NULL) 83 _thread_init(); 84 error = _find_thread(pthread); 85 if (error != 0) 86 return (error); 87 88 /* 89 * A 0 signal means do error-checking but don't send signal. 90 */ 91 if (sig == 0) 92 return (0); 93 94 return (thr_kill(pthread->thr_id, sig)); 95 } 96 97 /* 98 * User thread signal handler wrapper. 99 */ 100 void 101 _thread_sig_wrapper(int sig, siginfo_t *info, void *context) 102 { 103 struct pthread_state_data psd; 104 struct sigaction *actp; 105 __siginfohandler_t *handler; 106 struct umtx *up; 107 spinlock_t *sp; 108 109 /* 110 * Do a little cleanup handling for those threads in 111 * queues before calling the signal handler. Signals 112 * for these threads are temporarily blocked until 113 * after cleanup handling. 114 */ 115 switch (curthread->state) { 116 case PS_BARRIER_WAIT: 117 /* 118 * XXX - The thread has reached the barrier. We can't 119 * "back it away" from the barrier. 120 */ 121 _thread_critical_enter(curthread); 122 break; 123 case PS_COND_WAIT: 124 /* 125 * Cache the address, since it will not be available 126 * after it has been backed out. 127 */ 128 up = &curthread->data.cond->c_lock; 129 130 UMTX_LOCK(up); 131 _thread_critical_enter(curthread); 132 _cond_wait_backout(curthread); 133 UMTX_UNLOCK(up); 134 break; 135 case PS_MUTEX_WAIT: 136 /* 137 * Cache the address, since it will not be available 138 * after it has been backed out. 139 */ 140 sp = &curthread->data.mutex->lock; 141 142 _SPINLOCK(sp); 143 _thread_critical_enter(curthread); 144 _mutex_lock_backout(curthread); 145 _SPINUNLOCK(sp); 146 break; 147 default: 148 /* 149 * We need to lock the thread to read it's flags. 150 */ 151 _thread_critical_enter(curthread); 152 break; 153 } 154 155 /* 156 * We save the flags now so that any modifications done as part 157 * of the backout are reflected when the flags are restored. 158 */ 159 psd.psd_flags = curthread->flags; 160 161 PTHREAD_SET_STATE(curthread, PS_RUNNING); 162 _thread_critical_exit(curthread); 163 actp = proc_sigact_sigaction(sig); 164 handler = (__siginfohandler_t *)actp->sa_handler; 165 handler(sig, info, (ucontext_t *)context); 166 167 /* Restore the thread's flags, and make it runnable */ 168 _thread_critical_enter(curthread); 169 curthread->flags = psd.psd_flags; 170 PTHREAD_SET_STATE(curthread, PS_RUNNING); 171 _thread_critical_exit(curthread); 172 } 173