mutex create function and threadid

src/mutex.c

 #include "mutex.h"
 
+mutex mutex_create()
+{
+    mutex m;
+    m.lock_var=0;
+    m.value=0;
+    m.thread_id=0;
+    return m;
+}
+
 uint32_t mutex_lock(mutex m)
 {
     asm volatile

src/mutex.h

@@ -7,8 +7,10 @@ typedef struct
 {
     uint32_t lock_var;
     uint32_t value;
+    uint32_t thread_id;
 }__attribute__((packed)) mutex;
 
+mutex mutex_create();
 uint32_t mutex_lock(mutex m);
 uint32_t mutex_unlock(mutex m);