#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
+#include <time.h>
#include <pthread.h>
#include <sys/mman.h>
#include "mutex.h"
#include "arch/arch.h"
#include "os/os.h"
+#include "helpers.h"
void fio_mutex_remove(struct fio_mutex *mutex)
{
- close(mutex->mutex_fd);
munmap((void *) mutex, sizeof(*mutex));
}
struct fio_mutex *fio_mutex_init(int value)
{
- char mutex_name[] = "/tmp/.fio_mutex.XXXXXX";
struct fio_mutex *mutex = NULL;
pthread_mutexattr_t attr;
pthread_condattr_t cond;
- int fd, ret, mflag;
-
- fd = mkstemp(mutex_name);
- if (fd < 0) {
- perror("open mutex");
- return NULL;
- }
-
- if (ftruncate(fd, sizeof(struct fio_mutex)) < 0) {
- perror("ftruncate mutex");
- goto err;
- }
+ int ret, mflag;
mutex = (void *) mmap(NULL, sizeof(struct fio_mutex),
- PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+ PROT_READ | PROT_WRITE,
+ OS_MAP_ANON | MAP_SHARED, -1, 0);
if (mutex == MAP_FAILED) {
perror("mmap mutex");
- close(fd);
mutex = NULL;
goto err;
}
- unlink(mutex_name);
- mutex->mutex_fd = fd;
mutex->value = value;
/*
log_err("pthread_mutexattr_init: %s\n", strerror(ret));
goto err;
}
+#ifdef FIO_HAVE_PSHARED_MUTEX
ret = pthread_mutexattr_setpshared(&attr, mflag);
if (ret) {
log_err("pthread_mutexattr_setpshared: %s\n", strerror(ret));
goto err;
}
+#endif
pthread_condattr_init(&cond);
+#ifdef FIO_HAVE_PSHARED_MUTEX
pthread_condattr_setpshared(&cond, mflag);
+#endif
pthread_cond_init(&mutex->cond, &cond);
ret = pthread_mutex_init(&mutex->lock, &attr);
goto err;
}
+ pthread_condattr_destroy(&cond);
+ pthread_mutexattr_destroy(&attr);
+
return mutex;
err:
if (mutex)
fio_mutex_remove(mutex);
- unlink(mutex_name);
return NULL;
}
+int fio_mutex_down_timeout(struct fio_mutex *mutex, unsigned int seconds)
+{
+ struct timespec t;
+ int ret = 0;
+
+ clock_gettime(CLOCK_REALTIME, &t);
+ t.tv_sec += seconds;
+
+ pthread_mutex_lock(&mutex->lock);
+
+ while (!mutex->value && !ret) {
+ mutex->waiters++;
+ ret = pthread_cond_timedwait(&mutex->cond, &mutex->lock, &t);
+ mutex->waiters--;
+ }
+
+ if (!ret) {
+ mutex->value--;
+ pthread_mutex_unlock(&mutex->lock);
+ }
+
+ return ret;
+}
+
void fio_mutex_down(struct fio_mutex *mutex)
{
pthread_mutex_lock(&mutex->lock);