11 #include "arch/arch.h"
13 void fio_mutex_remove(struct fio_mutex *mutex)
15 close(mutex->mutex_fd);
16 munmap((void *) mutex, sizeof(*mutex));
19 struct fio_mutex *fio_mutex_init(int value)
21 char mutex_name[] = "/tmp/.fio_mutex.XXXXXX";
22 struct fio_mutex *mutex = NULL;
23 pthread_mutexattr_t attr;
24 pthread_condattr_t cond;
27 fd = mkstemp(mutex_name);
33 if (ftruncate(fd, sizeof(struct fio_mutex)) < 0) {
34 perror("ftruncate mutex");
38 mutex = (void *) mmap(NULL, sizeof(struct fio_mutex),
39 PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
40 if (mutex == MAP_FAILED) {
52 * Not all platforms support process shared mutexes (FreeBSD)
54 #ifdef FIO_HAVE_PSHARED_MUTEX
55 mflag = PTHREAD_PROCESS_SHARED;
57 mflag = PTHREAD_PROCESS_PRIVATE;
60 ret = pthread_mutexattr_init(&attr);
62 log_err("pthread_mutexattr_init: %s\n", strerror(ret));
65 ret = pthread_mutexattr_setpshared(&attr, mflag);
67 log_err("pthread_mutexattr_setpshared: %s\n", strerror(ret));
71 pthread_condattr_init(&cond);
72 pthread_condattr_setpshared(&cond, mflag);
73 pthread_cond_init(&mutex->cond, &cond);
75 ret = pthread_mutex_init(&mutex->lock, &attr);
77 log_err("pthread_mutex_init: %s\n", strerror(ret));
84 fio_mutex_remove(mutex);
90 void fio_mutex_down(struct fio_mutex *mutex)
92 pthread_mutex_lock(&mutex->lock);
94 while (!mutex->value) {
96 pthread_cond_wait(&mutex->cond, &mutex->lock);
101 pthread_mutex_unlock(&mutex->lock);
104 void fio_mutex_up(struct fio_mutex *mutex)
106 pthread_mutex_lock(&mutex->lock);
108 if (!mutex->value && mutex->waiters)
109 pthread_cond_signal(&mutex->cond);
111 pthread_mutex_unlock(&mutex->lock);
114 void fio_mutex_down_write(struct fio_mutex *mutex)
116 pthread_mutex_lock(&mutex->lock);
118 while (mutex->value != 0) {
120 pthread_cond_wait(&mutex->cond, &mutex->lock);
125 pthread_mutex_unlock(&mutex->lock);
128 void fio_mutex_down_read(struct fio_mutex *mutex)
130 pthread_mutex_lock(&mutex->lock);
132 while (mutex->value < 0) {
134 pthread_cond_wait(&mutex->cond, &mutex->lock);
139 pthread_mutex_unlock(&mutex->lock);
142 void fio_mutex_up_read(struct fio_mutex *mutex)
144 pthread_mutex_lock(&mutex->lock);
147 if (mutex->value >= 0 && mutex->waiters)
148 pthread_cond_signal(&mutex->cond);
149 pthread_mutex_unlock(&mutex->lock);
152 void fio_mutex_up_write(struct fio_mutex *mutex)
154 pthread_mutex_lock(&mutex->lock);
157 if (mutex->value >= 0 && mutex->waiters)
158 pthread_cond_signal(&mutex->cond);
159 pthread_mutex_unlock(&mutex->lock);