#include <stdio.h> #import "OFString.h" #import "OFThread.h" OFObject *lock; @interface MyThread: OFThread - main; @end @implementation MyThread - main { printf("[%s] Entering #1\n", [object cString]); @synchronized (lock) { printf("[%s] Entering #2\n", [object cString]); @synchronized (lock) { printf("[%s] Hello!\n", [object cString]); } printf("[%s] Left #2\n", [object cString]); } printf("[%s] Left #1\n", [object cString]); return nil; } @end int main() { lock = [[OFObject alloc] init]; MyThread *t1 = [MyThread threadWithObject: @"A"]; MyThread *t2 = [MyThread threadWithObject: @"B"]; [t1 join]; [t2 join]; return 0; }