1 //===-- blocked.m --------------------------------------------------*- ObjC -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 // This file is for testing running "print object" in a case where another thread 11 // blocks the print object from making progress. Set a breakpoint on the line in 12 // my_pthread_routine as indicated. Then switch threads to the main thread, and 13 // do print the lock_me object. Since that will try to get the lock already gotten 14 // by my_pthread_routime thread, it will have to switch to running all threads, and 15 // that should then succeed. 16 // 17 18 #include <Foundation/Foundation.h> 19 #include <pthread.h> 20 21 static pthread_mutex_t test_mutex; 22 23 static void Mutex_Init (void) 24 { 25 pthread_mutexattr_t tmp_mutex_attr; 26 pthread_mutexattr_init(&tmp_mutex_attr); 27 pthread_mutex_init(&test_mutex, &tmp_mutex_attr); 28 } 29 30 @interface LockMe :NSObject 31 { 32 33 } 34 - (NSString *) description; 35 @end 36 37 @implementation LockMe 38 - (NSString *) description 39 { 40 printf ("LockMe trying to get the lock.\n"); 41 pthread_mutex_lock(&test_mutex); 42 printf ("LockMe got the lock.\n"); 43 pthread_mutex_unlock(&test_mutex); 44 return @"I am pretty special.\n"; 45 } 46 @end 47 48 void * 49 my_pthread_routine (void *data) 50 { 51 printf ("my_pthread_routine about to enter.\n"); 52 pthread_mutex_lock(&test_mutex); 53 printf ("Releasing Lock.\n"); // Set a breakpoint here. 54 pthread_mutex_unlock(&test_mutex); 55 return NULL; 56 } 57 58 int 59 main () 60 { 61 pthread_attr_t tmp_attr; 62 pthread_attr_init (&tmp_attr); 63 pthread_t my_pthread; 64 65 Mutex_Init (); 66 67 LockMe *lock_me = [[LockMe alloc] init]; 68 pthread_create (&my_pthread, &tmp_attr, my_pthread_routine, NULL); 69 70 pthread_join (my_pthread, NULL); 71 72 return 0; 73 } 74
