Data commit

Task/Mutex/Objective-C/mutex.m

@@ -0,0 +1,11 @@
+NSLock *m = [[NSLock alloc] init];
+
+[m lock]; // locks in blocking mode
+
+if ([m tryLock]) { // acquire a lock -- does not block if not acquired
+  // lock acquired
+} else {
+  // already locked, does not block
+}
+
+[m unlock];