Switch mutex to using anonymous mmap
We don't need an fd backing for this, saves on file descriptors
in use.
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
diff --git a/mutex.c b/mutex.c
index e33e7cc..bbbcccb 100644
--- a/mutex.c
+++ b/mutex.c
@@ -15,44 +15,25 @@
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;
- }
-
-#ifdef FIO_HAVE_FALLOCATE
- posix_fallocate(fd, 0, sizeof(struct fio_mutex));
-#endif
-
- 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;
/*
@@ -97,7 +78,6 @@
if (mutex)
fio_mutex_remove(mutex);
- unlink(mutex_name);
return NULL;
}