Semaphore Implementation

Semaphore_Implementation/Semaphore_Implementation.h

@@ -0,0 +1,50 @@
+#ifndef __SEMA__
+#define __SEMA__
+
+#include <pthread.h>
+
+typedef struct sema_ sema_t;
+
+struct sema_ {
+
+	int permit_counter;
+	pthread_cond_t cv;
+	pthread_mutex_t mutex;
+};
+
+sema_t*
+sema_get_new_semaphore();
+
+void
+sema_init(sema_t* sema, int count);
+
+void
+sema_wait(sema_t* sema);
+
+void
+sema_post(sema_t* sema);
+
+void
+sema_destroy(sema_t* sema);
+
+int
+sema_getvalue(sema_t* sema);
+
+/*
+Several texts using P & V notation to represent
+wait and signals
+*/
+
+
+#define P(sema) sema_wait(sema)
+#define V(sema) sema_post(sema)
+
+/*
+Some texts also use up and down
+*/
+
+#define UP(sema) sema_wait(sema)
+#define DOWN(sema) sema_post(sema)
+
+
+#endif /* __SEMA__ */