X-Git-Url: https://git.kernel.dk/?p=fio.git;a=blobdiff_plain;f=mutex.c;h=e1fbb607f1a416fb06a25a611f0f4233c9814357;hp=cc4e353d1f508e492eae65d052c4af65b9f08d5d;hb=782744ef60b7ed47a529d30b9f8e0c528c436fdb;hpb=ef6350576b1053b0491b17932dc29740d749ad4a

diff --git a/mutex.c b/mutex.c
index cc4e353d..e1fbb607 100644
--- a/mutex.c
+++ b/mutex.c
@@ -7,7 +7,9 @@
 #include <errno.h>
 #include <pthread.h>
 #include <sys/mman.h>
+#include <assert.h>
 
+#include "fio.h"
 #include "log.h"
 #include "mutex.h"
 #include "arch/arch.h"
@@ -18,6 +20,7 @@
 
 void fio_mutex_remove(struct fio_mutex *mutex)
 {
+	assert(mutex->magic == FIO_MUTEX_MAGIC);
 	pthread_cond_destroy(&mutex->cond);
 	munmap((void *) mutex, sizeof(*mutex));
 }
@@ -39,6 +42,7 @@ struct fio_mutex *fio_mutex_init(int value)
 	}
 
 	mutex->value = value;
+	mutex->magic = FIO_MUTEX_MAGIC;
 
 	ret = pthread_mutexattr_init(&attr);
 	if (ret) {
@@ -60,11 +64,6 @@ struct fio_mutex *fio_mutex_init(int value)
 	pthread_condattr_init(&cond);
 #ifdef FIO_HAVE_PSHARED_MUTEX
 	pthread_condattr_setpshared(&cond, PTHREAD_PROCESS_SHARED);
-#endif
-#ifdef FIO_HAVE_CLOCK_MONOTONIC
-	pthread_condattr_setclock(&cond, CLOCK_MONOTONIC);
-#else
-	pthread_condattr_setclock(&cond, CLOCK_REALTIME);
 #endif
 	pthread_cond_init(&mutex->cond, &cond);
 
@@ -96,14 +95,11 @@ int fio_mutex_down_timeout(struct fio_mutex *mutex, unsigned int seconds)
 	struct timespec t;
 	int ret = 0;
 
-	fio_gettime(&tv_s, NULL);
+	assert(mutex->magic == FIO_MUTEX_MAGIC);
 
-#ifdef FIO_HAVE_CLOCK_MONOTONIC
-	clock_gettime(CLOCK_MONOTONIC, &t);
-#else
-	clock_gettime(CLOCK_REALTIME, &t);
-#endif
-	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);
 
@@ -115,10 +111,8 @@ int fio_mutex_down_timeout(struct fio_mutex *mutex, unsigned int seconds)
 		 * 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);
+		if (ret == ETIMEDOUT && !mutex_timed_out(&tv_s, seconds))
 			ret = 0;
-		}
 
 		mutex->waiters--;
 	}
@@ -133,6 +127,8 @@ int fio_mutex_down_timeout(struct fio_mutex *mutex, unsigned int seconds)
 
 void fio_mutex_down(struct fio_mutex *mutex)
 {
+	assert(mutex->magic == FIO_MUTEX_MAGIC);
+
 	pthread_mutex_lock(&mutex->lock);
 
 	while (!mutex->value) {
@@ -147,6 +143,8 @@ void fio_mutex_down(struct fio_mutex *mutex)
 
 void fio_mutex_up(struct fio_mutex *mutex)
 {
+	assert(mutex->magic == FIO_MUTEX_MAGIC);
+
 	pthread_mutex_lock(&mutex->lock);
 	read_barrier();
 	if (!mutex->value && mutex->waiters)
@@ -155,50 +153,76 @@ void fio_mutex_up(struct fio_mutex *mutex)
 	pthread_mutex_unlock(&mutex->lock);
 }
 
-void fio_mutex_down_write(struct fio_mutex *mutex)
+void fio_rwlock_write(struct fio_rwlock *lock)
 {
-	pthread_mutex_lock(&mutex->lock);
-
-	while (mutex->value != 0) {
-		mutex->waiters++;
-		pthread_cond_wait(&mutex->cond, &mutex->lock);
-		mutex->waiters--;
-	}
-
-	mutex->value--;
-	pthread_mutex_unlock(&mutex->lock);
+	assert(lock->magic == FIO_RWLOCK_MAGIC);
+	pthread_rwlock_wrlock(&lock->lock);
 }
 
-void fio_mutex_down_read(struct fio_mutex *mutex)
+void fio_rwlock_read(struct fio_rwlock *lock)
 {
-	pthread_mutex_lock(&mutex->lock);
-
-	while (mutex->value < 0) {
-		mutex->waiters++;
-		pthread_cond_wait(&mutex->cond, &mutex->lock);
-		mutex->waiters--;
-	}
+	assert(lock->magic == FIO_RWLOCK_MAGIC);
+	pthread_rwlock_rdlock(&lock->lock);
+}
 
-	mutex->value++;
-	pthread_mutex_unlock(&mutex->lock);
+void fio_rwlock_unlock(struct fio_rwlock *lock)
+{
+	assert(lock->magic == FIO_RWLOCK_MAGIC);
+	pthread_rwlock_unlock(&lock->lock);
 }
 
-void fio_mutex_up_read(struct fio_mutex *mutex)
+void fio_rwlock_remove(struct fio_rwlock *lock)
 {
-	pthread_mutex_lock(&mutex->lock);
-	mutex->value--;
-	read_barrier();
-	if (mutex->value >= 0 && mutex->waiters)
-		pthread_cond_signal(&mutex->cond);
-	pthread_mutex_unlock(&mutex->lock);
+	assert(lock->magic == FIO_RWLOCK_MAGIC);
+	munmap((void *) lock, sizeof(*lock));
 }
 
-void fio_mutex_up_write(struct fio_mutex *mutex)
+struct fio_rwlock *fio_rwlock_init(void)
 {
-	pthread_mutex_lock(&mutex->lock);
-	mutex->value++;
-	read_barrier();
-	if (mutex->value >= 0 && mutex->waiters)
-		pthread_cond_signal(&mutex->cond);
-	pthread_mutex_unlock(&mutex->lock);
+	struct fio_rwlock *lock;
+	pthread_rwlockattr_t attr;
+	int ret;
+
+	lock = (void *) mmap(NULL, sizeof(struct fio_rwlock),
+				PROT_READ | PROT_WRITE,
+				OS_MAP_ANON | MAP_SHARED, -1, 0);
+	if (lock == MAP_FAILED) {
+		perror("mmap rwlock");
+		lock = NULL;
+		goto err;
+	}
+
+	lock->magic = FIO_RWLOCK_MAGIC;
+
+	ret = pthread_rwlockattr_init(&attr);
+	if (ret) {
+		log_err("pthread_rwlockattr_init: %s\n", strerror(ret));
+		goto err;
+	}
+#ifdef FIO_HAVE_PSHARED_MUTEX
+	ret = pthread_rwlockattr_setpshared(&attr, PTHREAD_PROCESS_SHARED);
+	if (ret) {
+		log_err("pthread_rwlockattr_setpshared: %s\n", strerror(ret));
+		goto destroy_attr;
+	}
+
+	ret = pthread_rwlock_init(&lock->lock, &attr);
+#else
+	ret = pthread_rwlock_init(&lock->lock, NULL);
+#endif
+
+	if (ret) {
+		log_err("pthread_rwlock_init: %s\n", strerror(ret));
+		goto destroy_attr;
+	}
+
+	pthread_rwlockattr_destroy(&attr);
+
+	return lock;
+destroy_attr:
+	pthread_rwlockattr_destroy(&attr);
+err:
+	if (lock)
+		fio_rwlock_remove(lock);
+	return NULL;
 }