Makefile: break long line

[fio.git] / mutex.c

diff --git a/mutex.c b/mutex.c
index e33e7cc8f2611a42256e72a3bceddf9e7560b1ef..3b94beffc7342ae2f13879126e2da3433cb5bbf1 100644 (file)
--- a/mutex.c
+++ b/mutex.c
@@ -4,73 +4,54 @@
 #include <stdlib.h>
 #include <fcntl.h>
 #include <time.h>
+#include <errno.h>
 #include <pthread.h>
 #include <sys/mman.h>
 
+#include "fio.h"
 #include "log.h"
 #include "mutex.h"
 #include "arch/arch.h"
 #include "os/os.h"
 #include "helpers.h"
+#include "time.h"
+#include "gettime.h"
 
 void fio_mutex_remove(struct fio_mutex *mutex)
 {
-       close(mutex->mutex_fd);
+       pthread_cond_destroy(&mutex->cond);
        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;
 
        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;
 
-       /*
-        * Not all platforms support process shared mutexes (FreeBSD)
-        */
-#ifdef FIO_HAVE_PSHARED_MUTEX
-       mflag = PTHREAD_PROCESS_SHARED;
-#else
-       mflag = PTHREAD_PROCESS_PRIVATE;
-#endif
-
        ret = pthread_mutexattr_init(&attr);
        if (ret) {
                log_err("pthread_mutexattr_init: %s\n", strerror(ret));
                goto err;
        }
+
+       /*
+        * Not all platforms support process shared mutexes (FreeBSD)
+        */
 #ifdef FIO_HAVE_PSHARED_MUTEX
-       ret = pthread_mutexattr_setpshared(&attr, mflag);
+       ret = pthread_mutexattr_setpshared(&attr, PTHREAD_PROCESS_SHARED);
        if (ret) {
                log_err("pthread_mutexattr_setpshared: %s\n", strerror(ret));
                goto err;
@@ -79,7 +60,7 @@ struct fio_mutex *fio_mutex_init(int value)
 
        pthread_condattr_init(&cond);
 #ifdef FIO_HAVE_PSHARED_MUTEX
-       pthread_condattr_setpshared(&cond, mflag);
+       pthread_condattr_setpshared(&cond, PTHREAD_PROCESS_SHARED);
 #endif
        pthread_cond_init(&mutex->cond, &cond);
 
@@ -97,23 +78,39 @@ err:
        if (mutex)
                fio_mutex_remove(mutex);
 
-       unlink(mutex_name);
        return NULL;
 }
 
+static int mutex_timed_out(struct timeval *t, unsigned int seconds)
+{
+       return mtime_since_now(t) >= seconds * 1000;
+}
+
 int fio_mutex_down_timeout(struct fio_mutex *mutex, unsigned int seconds)
 {
+       struct timeval tv_s;
        struct timespec t;
        int ret = 0;
 
-       clock_gettime(CLOCK_REALTIME, &t);
-       t.tv_sec += seconds;
+       gettimeofday(&tv_s, NULL);
+       t.tv_sec = tv_s.tv_sec + seconds;
+       t.tv_nsec = tv_s.tv_usec * 1000;
 
        pthread_mutex_lock(&mutex->lock);
 
        while (!mutex->value && !ret) {
                mutex->waiters++;
+
+               /*
+                * Some platforms (FreeBSD 9?) seems to return timed out
+                * way too early, double check.
+                */
                ret = pthread_cond_timedwait(&mutex->cond, &mutex->lock, &t);
+               if (ret == ETIMEDOUT && !mutex_timed_out(&tv_s, seconds)) {
+                       pthread_mutex_lock(&mutex->lock);
+                       ret = 0;
+               }
+
                mutex->waiters--;
        }