update name of code to labcodes

labcodes/lab8/user/libs/lock.h

@@ -0,0 +1,42 @@
+#ifndef __USER_LIBS_LOCK_H__
+#define __USER_LIBS_LOCK_H__
+
+#include <defs.h>
+#include <atomic.h>
+#include <ulib.h>
+
+#define INIT_LOCK           {0}
+
+typedef volatile bool lock_t;
+
+static inline void
+lock_init(lock_t *l) {
+    *l = 0;
+}
+
+static inline bool
+try_lock(lock_t *l) {
+    return test_and_set_bit(0, l);
+}
+
+static inline void
+lock(lock_t *l) {
+    if (try_lock(l)) {
+        int step = 0;
+        do {
+            yield();
+            if (++ step == 100) {
+                step = 0;
+                sleep(10);
+            }
+        } while (try_lock(l));
+    }
+}
+
+static inline void
+unlock(lock_t *l) {
+    test_and_clear_bit(0, l);
+}
+
+#endif /* !__USER_LIBS_LOCK_H__ */
+