atom_* renamed to atomic_*; add mutex.*

mutex.c

@@ -0,0 +1,24 @@
+/*
+ * Copyright 2022 Oleg Borodin  <borodin@unix7.org>
+ */
+
+#include "mutex.h"
+#include "atomic.h"
+
+void mutex_init(mutex_t* mutex) {
+    mutex->value = 1;
+}
+
+int32_t mutex_wait(mutex_t* mutex) {
+    //while(mutex->value <= 0);
+    //mutex->value--;
+    //return mutex->value;
+    while (atomic_dec32(&(mutex->value), (int32_t)0) <= 0);
+    return atomic_dec32(&(mutex->value), (int32_t)1);
+}
+
+int32_t mutex_post(mutex_t* mutex) {
+    //mutex->value++;
+    //return mutex->value;
+    return atomic_inc32(&(mutex->value), (int32_t)1);
+}