Implement proper mutex cleanup

init/init.c

@@ -6,7 +6,7 @@
 #include <stdint.h>
 #include <string/string.h>
 
-#define EXAMPLE 2
+#define EXAMPLE 3
 
 #if EXAMPLE == 1
 
@@ -57,6 +57,49 @@ void app_main (void) {
   }
 }
 
+void app_thread1 (void) {
+  for (;;) {
+    lock_mutex (MUTEX, RV_PRIVATE);
+
+    for (int i = 0; i < 3; i++)
+      test ('b');
+
+    unlock_mutex (MUTEX, RV_PRIVATE);
+  }
+
+  quit ();
+}
+#elif EXAMPLE == 3
+
+#define MUTEX 2000
+
+void app_thread1 (void);
+
+int spawn (void (*fn) (void)) {
+  size_t stack_size = 256 * PAGE_SIZE;
+  void* stack = malloc (stack_size);
+  if (stack == NULL)
+    return -ST_OOM_ERROR;
+
+  uintptr_t stack_top = (uintptr_t)stack + stack_size;
+  return clone (stack_top, stack_size, fn);
+}
+
+void app_main (void) {
+  create_mutex (MUTEX, RV_PRIVATE);
+
+  spawn (&app_thread1);
+
+  for (;;) {
+    lock_mutex (MUTEX, RV_PRIVATE);
+
+    for (int i = 0; i < 3; i++)
+      test ('a');
+
+    quit ();
+  }
+}
+
 void app_thread1 (void) {
   for (;;) {
     lock_mutex (MUTEX, RV_PRIVATE);