From: Jens Axboe <jens.axboe@oracle.com>
Date: Mon, 3 Mar 2008 09:36:27 +0000 (+0100)
Subject: Add read-write mutexes
X-Git-Tag: fio-1.20-rc1~8
X-Git-Url: https://git.kernel.dk/?p=fio.git;a=commitdiff_plain;h=64d4d313ef4f537408d28fac863cf2a2b0f00175;hp=28cfeb6851703cf12b54b3a06bf3ff611198933e;ds=sidebyside

Add read-write mutexes

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
---

diff --git a/mutex.c b/mutex.c
index f3c83266..bcc37ae6 100644
--- a/mutex.c
+++ b/mutex.c
@@ -90,3 +90,39 @@ void fio_mutex_up(struct fio_mutex *mutex)
 	mutex->value++;
 	pthread_mutex_unlock(&mutex->lock);
 }
+
+void fio_mutex_down_write(struct fio_mutex *mutex)
+{
+	pthread_mutex_lock(&mutex->lock);
+	while (mutex->value != 0)
+		pthread_cond_wait(&mutex->cond, &mutex->lock);
+	mutex->value--;
+	pthread_mutex_unlock(&mutex->lock);
+}
+
+void fio_mutex_down_read(struct fio_mutex *mutex)
+{
+	pthread_mutex_lock(&mutex->lock);
+	while (mutex->value < 0)
+		pthread_cond_wait(&mutex->cond, &mutex->lock);
+	mutex->value++;
+	pthread_mutex_unlock(&mutex->lock);
+}
+
+void fio_mutex_up_read(struct fio_mutex *mutex)
+{
+	pthread_mutex_lock(&mutex->lock);
+	mutex->value--;
+	if (mutex->value >= 0)
+		pthread_cond_signal(&mutex->cond);
+	pthread_mutex_unlock(&mutex->lock);
+}
+
+void fio_mutex_up_write(struct fio_mutex *mutex)
+{
+	pthread_mutex_lock(&mutex->lock);
+	mutex->value++;
+	if (mutex->value >= 0)
+		pthread_cond_signal(&mutex->cond);
+	pthread_mutex_unlock(&mutex->lock);
+}
diff --git a/mutex.h b/mutex.h
index 0c862dba..74515936 100644
--- a/mutex.h
+++ b/mutex.h
@@ -6,7 +6,7 @@
 struct fio_mutex {
 	pthread_mutex_t lock;
 	pthread_cond_t cond;
-	unsigned int value;
+	int value;
 
 	int mutex_fd;
 };
@@ -14,6 +14,10 @@ struct fio_mutex {
 extern struct fio_mutex *fio_mutex_init(int);
 extern void fio_mutex_remove(struct fio_mutex *);
 extern void fio_mutex_down(struct fio_mutex *);
+extern void fio_mutex_down_read(struct fio_mutex *);
+extern void fio_mutex_down_write(struct fio_mutex *);
 extern void fio_mutex_up(struct fio_mutex *);
+extern void fio_mutex_up_read(struct fio_mutex *);
+extern void fio_mutex_up_write(struct fio_mutex *);
 
 #endif