11 void fio_mutex_remove(struct fio_mutex *mutex)
13 close(mutex->mutex_fd);
14 munmap(mutex, sizeof(*mutex));
17 struct fio_mutex *fio_mutex_init(int value)
19 char mutex_name[] = "/tmp/.fio_mutex.XXXXXX";
20 struct fio_mutex *mutex = NULL;
21 pthread_mutexattr_t attr;
22 pthread_condattr_t cond;
25 fd = mkstemp(mutex_name);
31 if (ftruncate(fd, sizeof(struct fio_mutex)) < 0) {
32 perror("ftruncate mutex");
36 mutex = mmap(NULL, sizeof(struct fio_mutex), PROT_READ | PROT_WRITE,
38 if (mutex == MAP_FAILED) {
49 if (pthread_mutexattr_init(&attr)) {
50 perror("pthread_mutexattr_init");
53 if (pthread_mutexattr_setpshared(&attr, PTHREAD_PROCESS_SHARED)) {
54 perror("pthread_mutexattr_setpshared");
58 pthread_condattr_init(&cond);
59 pthread_condattr_setpshared(&cond, PTHREAD_PROCESS_SHARED);
60 pthread_cond_init(&mutex->cond, &cond);
62 if (pthread_mutex_init(&mutex->lock, &attr)) {
63 perror("pthread_mutex_init");
70 fio_mutex_remove(mutex);
76 void fio_mutex_down(struct fio_mutex *mutex)
78 pthread_mutex_lock(&mutex->lock);
79 while (mutex->value == 0)
80 pthread_cond_wait(&mutex->cond, &mutex->lock);
82 pthread_mutex_unlock(&mutex->lock);
85 void fio_mutex_up(struct fio_mutex *mutex)
87 pthread_mutex_lock(&mutex->lock);
89 pthread_cond_signal(&mutex->cond);
91 pthread_mutex_unlock(&mutex->lock);