xref: /illumos-kvm-cmd/qemu-thread.c (revision 68396ea9)
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_destroy(QemuMutex * mutex)37 void qemu_mutex_destroy(QemuMutex *mutex)
38 {
39     int err;
40 
41     err = pthread_mutex_destroy(&mutex->lock);
42     if (err)
43         error_exit(err, __func__);
44 }
45 
qemu_mutex_lock(QemuMutex * mutex)46 void qemu_mutex_lock(QemuMutex *mutex)
47 {
48     int err;
49 
50     err = pthread_mutex_lock(&mutex->lock);
51     if (err)
52         error_exit(err, __func__);
53 }
54 
qemu_mutex_trylock(QemuMutex * mutex)55 int qemu_mutex_trylock(QemuMutex *mutex)
56 {
57     return pthread_mutex_trylock(&mutex->lock);
58 }
59 
timespec_add_ms(struct timespec * ts,uint64_t msecs)60 static void timespec_add_ms(struct timespec *ts, uint64_t msecs)
61 {
62     ts->tv_sec = ts->tv_sec + (long)(msecs / 1000);
63     ts->tv_nsec = (ts->tv_nsec + ((long)msecs % 1000) * 1000000);
64     if (ts->tv_nsec >= 1000000000) {
65         ts->tv_nsec -= 1000000000;
66         ts->tv_sec++;
67     }
68 }
69 
qemu_mutex_timedlock(QemuMutex * mutex,uint64_t msecs)70 int qemu_mutex_timedlock(QemuMutex *mutex, uint64_t msecs)
71 {
72     int err;
73     struct timespec ts;
74 
75     clock_gettime(CLOCK_REALTIME, &ts);
76     timespec_add_ms(&ts, msecs);
77 
78     err = pthread_mutex_timedlock(&mutex->lock, &ts);
79     if (err && err != ETIMEDOUT)
80         error_exit(err, __func__);
81     return err;
82 }
83 
qemu_mutex_unlock(QemuMutex * mutex)84 void qemu_mutex_unlock(QemuMutex *mutex)
85 {
86     int err;
87 
88     err = pthread_mutex_unlock(&mutex->lock);
89     if (err)
90         error_exit(err, __func__);
91 }
92 
qemu_cond_init(QemuCond * cond)93 void qemu_cond_init(QemuCond *cond)
94 {
95     int err;
96 
97     err = pthread_cond_init(&cond->cond, NULL);
98     if (err)
99         error_exit(err, __func__);
100 }
101 
qemu_cond_destroy(QemuCond * cond)102 void qemu_cond_destroy(QemuCond *cond)
103 {
104     int err;
105 
106     err = pthread_cond_destroy(&cond->cond);
107     if (err)
108         error_exit(err, __func__);
109 }
110 
qemu_cond_signal(QemuCond * cond)111 void qemu_cond_signal(QemuCond *cond)
112 {
113     int err;
114 
115     err = pthread_cond_signal(&cond->cond);
116     if (err)
117         error_exit(err, __func__);
118 }
119 
qemu_cond_broadcast(QemuCond * cond)120 void qemu_cond_broadcast(QemuCond *cond)
121 {
122     int err;
123 
124     err = pthread_cond_broadcast(&cond->cond);
125     if (err)
126         error_exit(err, __func__);
127 }
128 
qemu_cond_wait(QemuCond * cond,QemuMutex * mutex)129 void qemu_cond_wait(QemuCond *cond, QemuMutex *mutex)
130 {
131     int err;
132 
133     err = pthread_cond_wait(&cond->cond, &mutex->lock);
134     if (err)
135         error_exit(err, __func__);
136 }
137 
qemu_cond_timedwait(QemuCond * cond,QemuMutex * mutex,uint64_t msecs)138 int qemu_cond_timedwait(QemuCond *cond, QemuMutex *mutex, uint64_t msecs)
139 {
140     struct timespec ts;
141     int err;
142 
143     clock_gettime(CLOCK_REALTIME, &ts);
144     timespec_add_ms(&ts, msecs);
145 
146     err = pthread_cond_timedwait(&cond->cond, &mutex->lock, &ts);
147     if (err && err != ETIMEDOUT)
148         error_exit(err, __func__);
149     return err;
150 }
151 
qemu_thread_create(QemuThread * thread,void * (* start_routine)(void *),void * arg)152 void qemu_thread_create(QemuThread *thread,
153                        void *(*start_routine)(void*),
154                        void *arg)
155 {
156     int err;
157 
158     /* Leave signal handling to the iothread.  */
159     sigset_t set, oldset;
160 
161     sigfillset(&set);
162     pthread_sigmask(SIG_SETMASK, &set, &oldset);
163     err = pthread_create(&thread->thread, NULL, start_routine, arg);
164     if (err)
165         error_exit(err, __func__);
166 
167     pthread_sigmask(SIG_SETMASK, &oldset, NULL);
168 }
169 
qemu_thread_signal(QemuThread * thread,int sig)170 void qemu_thread_signal(QemuThread *thread, int sig)
171 {
172     int err;
173 
174     err = pthread_kill(thread->thread, sig);
175     if (err)
176         error_exit(err, __func__);
177 }
178 
qemu_thread_self(QemuThread * thread)179 void qemu_thread_self(QemuThread *thread)
180 {
181     thread->thread = pthread_self();
182 }
183 
qemu_thread_equal(QemuThread * thread1,QemuThread * thread2)184 int qemu_thread_equal(QemuThread *thread1, QemuThread *thread2)
185 {
186    return pthread_equal(thread1->thread, thread2->thread);
187 }
188 
qemu_thread_exit(void * retval)189 void qemu_thread_exit(void *retval)
190 {
191     pthread_exit(retval);
192 }
193