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