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// This file is for testing running "print object" in a case where another thread
// blocks the print object from making progress. Set a breakpoint on the line in
// my_pthread_routine as indicated. Then switch threads to the main thread, and
// do print the lock_me object. Since that will try to get the lock already gotten
// by my_pthread_routime thread, it will have to switch to running all threads, and
// that should then succeed.
//
#include <Foundation/Foundation.h>
#include <pthread.h>
static pthread_mutex_t test_mutex;
static void Mutex_Init (void)
{
pthread_mutexattr_t tmp_mutex_attr;
pthread_mutexattr_init(&tmp_mutex_attr);
pthread_mutex_init(&test_mutex, &tmp_mutex_attr);
}
@interface LockMe :NSObject
{
}
- (NSString *) description;
@end
@implementation LockMe
- (NSString *) description
{
printf ("LockMe trying to get the lock.\n");
pthread_mutex_lock(&test_mutex);
printf ("LockMe got the lock.\n");
pthread_mutex_unlock(&test_mutex);
return @"I am pretty special.\n";
}
@end
void *
my_pthread_routine (void *data)
{
printf ("my_pthread_routine about to enter.\n");
pthread_mutex_lock(&test_mutex);
printf ("Releasing Lock.\n"); // Set a breakpoint here.
pthread_mutex_unlock(&test_mutex);
return NULL;
}
int
main ()
{
pthread_attr_t tmp_attr;
pthread_attr_init (&tmp_attr);
pthread_t my_pthread;
Mutex_Init ();
LockMe *lock_me = [[LockMe alloc] init];
pthread_create (&my_pthread, &tmp_attr, my_pthread_routine, NULL);
pthread_join (my_pthread, NULL);
return 0;
}
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