Merge nanoos

nanoos/semaphore.c

@@ -0,0 +1,24 @@
+/*
+ * Copyright 2022 Oleg Borodin  <borodin@unix7.org>
+ */
+
+#include "semaphore.h"
+#include "atomic.h"
+
+void sem_init(sem_t* sem, int32_t value) {
+    sem->value = value;
+}
+
+int32_t sem_wait(sem_t* sem) {
+    //while(sem->value <= 0);
+    //sem->value--;
+    //return sem->value;
+    //while (atomic_dec32(&(sem->value), (int32_t)0) <= 0);
+    return atomic_dec32le0(&(sem->value), (int32_t)1);
+}
+
+int32_t sem_post(sem_t* sem) {
+    //sem->value++;
+    //return sem->value;
+    return atomic_inc32(&(sem->value), (int32_t)1);
+}