Implement (half) simple semaphore & mutex lock, and ...

[lunaix-os.git] / lunaix-os / includes / lunaix / ds / mutex.h

diff --git a/lunaix-os/includes/lunaix/ds/mutex.h b/lunaix-os/includes/lunaix/ds/mutex.h
new file mode 100644 (file)
index 0000000..5e166e5
--- /dev/null
+++ b/lunaix-os/includes/lunaix/ds/mutex.h
@@ -0,0 +1,26 @@
+#ifndef __LUNAIX_MUTEX_H
+#define __LUNAIX_MUTEX_H
+
+#include "semaphore.h"
+
+// TODO: implement mutex lock
+
+typedef struct sem_t mutex_t;
+
+static inline void mutex_init(mutex_t *mutex) {
+    sem_init(mutex, 1);
+}
+
+static inline unsigned int mutex_on_hold(mutex_t *mutex) {
+    return !atomic_load(&mutex->counter);
+}
+
+static inline void mutex_lock(mutex_t *mutex) {
+    sem_wait(mutex);
+}
+
+static inline void mutex_unlock(mutex_t *mutex) {
+    sem_post(mutex);
+}
+
+#endif /* __LUNAIX_MUTEX_H */