aliguori | e5d355d | 2009-04-24 18:03:15 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Wrappers around mutex/cond/thread functions |
| 3 | * |
| 4 | * Copyright Red Hat, Inc. 2009 |
| 5 | * |
| 6 | * Author: |
| 7 | * Marcelo Tosatti <mtosatti@redhat.com> |
| 8 | * |
| 9 | * This work is licensed under the terms of the GNU GPL, version 2 or later. |
| 10 | * See the COPYING file in the top-level directory. |
| 11 | * |
| 12 | */ |
| 13 | #include <stdlib.h> |
| 14 | #include <stdio.h> |
| 15 | #include <errno.h> |
| 16 | #include <time.h> |
| 17 | #include <signal.h> |
| 18 | #include <stdint.h> |
| 19 | #include <string.h> |
| 20 | #include "qemu-thread.h" |
| 21 | |
| 22 | static void error_exit(int err, const char *msg) |
| 23 | { |
| 24 | fprintf(stderr, "qemu: %s: %s\n", msg, strerror(err)); |
| 25 | exit(1); |
| 26 | } |
| 27 | |
| 28 | void qemu_mutex_init(QemuMutex *mutex) |
| 29 | { |
| 30 | int err; |
| 31 | |
| 32 | err = pthread_mutex_init(&mutex->lock, NULL); |
| 33 | if (err) |
| 34 | error_exit(err, __func__); |
| 35 | } |
| 36 | |
| 37 | void qemu_mutex_lock(QemuMutex *mutex) |
| 38 | { |
| 39 | int err; |
| 40 | |
| 41 | err = pthread_mutex_lock(&mutex->lock); |
| 42 | if (err) |
| 43 | error_exit(err, __func__); |
| 44 | } |
| 45 | |
| 46 | int qemu_mutex_trylock(QemuMutex *mutex) |
| 47 | { |
| 48 | return pthread_mutex_trylock(&mutex->lock); |
| 49 | } |
| 50 | |
| 51 | static void timespec_add_ms(struct timespec *ts, uint64_t msecs) |
| 52 | { |
| 53 | ts->tv_sec = ts->tv_sec + (long)(msecs / 1000); |
| 54 | ts->tv_nsec = (ts->tv_nsec + ((long)msecs % 1000) * 1000000); |
| 55 | if (ts->tv_nsec >= 1000000000) { |
| 56 | ts->tv_nsec -= 1000000000; |
| 57 | ts->tv_sec++; |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | int qemu_mutex_timedlock(QemuMutex *mutex, uint64_t msecs) |
| 62 | { |
| 63 | int err; |
| 64 | struct timespec ts; |
| 65 | |
| 66 | clock_gettime(CLOCK_REALTIME, &ts); |
| 67 | timespec_add_ms(&ts, msecs); |
| 68 | |
| 69 | err = pthread_mutex_timedlock(&mutex->lock, &ts); |
| 70 | if (err && err != ETIMEDOUT) |
| 71 | error_exit(err, __func__); |
| 72 | return err; |
| 73 | } |
| 74 | |
| 75 | void qemu_mutex_unlock(QemuMutex *mutex) |
| 76 | { |
| 77 | int err; |
| 78 | |
| 79 | err = pthread_mutex_unlock(&mutex->lock); |
| 80 | if (err) |
| 81 | error_exit(err, __func__); |
| 82 | } |
| 83 | |
| 84 | void qemu_cond_init(QemuCond *cond) |
| 85 | { |
| 86 | int err; |
| 87 | |
| 88 | err = pthread_cond_init(&cond->cond, NULL); |
| 89 | if (err) |
| 90 | error_exit(err, __func__); |
| 91 | } |
| 92 | |
| 93 | void qemu_cond_signal(QemuCond *cond) |
| 94 | { |
| 95 | int err; |
| 96 | |
| 97 | err = pthread_cond_signal(&cond->cond); |
| 98 | if (err) |
| 99 | error_exit(err, __func__); |
| 100 | } |
| 101 | |
| 102 | void qemu_cond_broadcast(QemuCond *cond) |
| 103 | { |
| 104 | int err; |
| 105 | |
| 106 | err = pthread_cond_broadcast(&cond->cond); |
| 107 | if (err) |
| 108 | error_exit(err, __func__); |
| 109 | } |
| 110 | |
| 111 | void qemu_cond_wait(QemuCond *cond, QemuMutex *mutex) |
| 112 | { |
| 113 | int err; |
| 114 | |
| 115 | err = pthread_cond_wait(&cond->cond, &mutex->lock); |
| 116 | if (err) |
| 117 | error_exit(err, __func__); |
| 118 | } |
| 119 | |
| 120 | int qemu_cond_timedwait(QemuCond *cond, QemuMutex *mutex, uint64_t msecs) |
| 121 | { |
| 122 | struct timespec ts; |
| 123 | int err; |
| 124 | |
| 125 | clock_gettime(CLOCK_REALTIME, &ts); |
| 126 | timespec_add_ms(&ts, msecs); |
| 127 | |
| 128 | err = pthread_cond_timedwait(&cond->cond, &mutex->lock, &ts); |
| 129 | if (err && err != ETIMEDOUT) |
| 130 | error_exit(err, __func__); |
| 131 | return err; |
| 132 | } |
| 133 | |
| 134 | void qemu_thread_create(QemuThread *thread, |
| 135 | void *(*start_routine)(void*), |
| 136 | void *arg) |
| 137 | { |
| 138 | int err; |
| 139 | |
| 140 | err = pthread_create(&thread->thread, NULL, start_routine, arg); |
| 141 | if (err) |
| 142 | error_exit(err, __func__); |
| 143 | } |
| 144 | |
| 145 | void qemu_thread_signal(QemuThread *thread, int sig) |
| 146 | { |
| 147 | int err; |
| 148 | |
| 149 | err = pthread_kill(thread->thread, sig); |
| 150 | if (err) |
| 151 | error_exit(err, __func__); |
| 152 | } |
| 153 | |
| 154 | void qemu_thread_self(QemuThread *thread) |
| 155 | { |
| 156 | thread->thread = pthread_self(); |
| 157 | } |
| 158 | |
| 159 | int qemu_thread_equal(QemuThread *thread1, QemuThread *thread2) |
| 160 | { |
| 161 | return (thread1->thread == thread2->thread); |
| 162 | } |
| 163 | |