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
21static pthread_mutex_t test_mutex;
22
23static 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
48void *
49my_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
58int
59main ()
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