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
error_exit(int err,const char * msg)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
qemu_mutex_init(QemuMutex * mutex)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
qemu_mutex_lock(QemuMutex * mutex)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
qemu_mutex_trylock(QemuMutex * mutex)46 int qemu_mutex_trylock(QemuMutex *mutex)
47 {
48 return pthread_mutex_trylock(&mutex->lock);
49 }
50
timespec_add_ms(struct timespec * ts,uint64_t msecs)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
qemu_mutex_timedlock(QemuMutex * mutex,uint64_t msecs)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
qemu_mutex_unlock(QemuMutex * mutex)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
qemu_cond_init(QemuCond * cond)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
qemu_cond_signal(QemuCond * cond)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
qemu_cond_broadcast(QemuCond * cond)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
qemu_cond_wait(QemuCond * cond,QemuMutex * mutex)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
qemu_cond_timedwait(QemuCond * cond,QemuMutex * mutex,uint64_t msecs)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
qemu_thread_create(QemuThread * thread,void * (* start_routine)(void *),void * arg)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
qemu_thread_signal(QemuThread * thread,int sig)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
qemu_thread_self(QemuThread * thread)154 void qemu_thread_self(QemuThread *thread)
155 {
156 thread->thread = pthread_self();
157 }
158
qemu_thread_equal(QemuThread * thread1,QemuThread * thread2)159 int qemu_thread_equal(QemuThread *thread1, QemuThread *thread2)
160 {
161 return (thread1->thread == thread2->thread);
162 }
163
164