sewardj | 7313524 | 2011-06-24 16:03:32 +0000 | [diff] [blame] | 1 | |
| 2 | /* Needed for older glibcs (2.3 and older, at least) who don't |
| 3 | otherwise "know" about pthread_rwlock_anything or about |
| 4 | PTHREAD_MUTEX_RECURSIVE (amongst things). */ |
| 5 | #define _GNU_SOURCE 1 |
| 6 | |
| 7 | #include <pthread.h> |
| 8 | #include <stdio.h> |
| 9 | #include <stdlib.h> |
| 10 | #include <assert.h> |
| 11 | #include <unistd.h> |
| 12 | |
| 13 | /* Test of the mechanism for showing all locks held by a thread. This |
| 14 | is like locked_vs_unlocked.c, except that it uses a recursively |
| 15 | lockable lock, and one thread holds the lock more than once. Point |
| 16 | is to check that the lock showing mechanism shows the |
| 17 | lock-number-of-times-held count. */ |
| 18 | |
| 19 | pthread_mutex_t mx; |
| 20 | |
| 21 | int x = 0; |
| 22 | |
| 23 | void* child_fn1 ( void* arg ) |
| 24 | { |
| 25 | int r; |
| 26 | r= pthread_mutex_lock(&mx); assert(!r); |
| 27 | r= pthread_mutex_lock(&mx); assert(!r); |
| 28 | x = 1; |
| 29 | r= pthread_mutex_unlock(&mx); assert(!r); |
| 30 | r= pthread_mutex_unlock(&mx); assert(!r); |
| 31 | sleep(1); |
| 32 | return NULL; |
| 33 | } |
| 34 | |
| 35 | void* child_fn2 ( void* arg ) |
| 36 | { |
| 37 | sleep(1); |
| 38 | x = 1; |
| 39 | return NULL; |
| 40 | } |
| 41 | |
| 42 | int main ( int argc, char** argv ) |
| 43 | { |
| 44 | int r; |
| 45 | pthread_t child1, child2; |
| 46 | pthread_mutexattr_t attr; |
| 47 | r = pthread_mutexattr_init( &attr ); |
| 48 | assert(!r); |
| 49 | r = pthread_mutexattr_settype( &attr, PTHREAD_MUTEX_RECURSIVE ); |
| 50 | assert(!r); |
| 51 | r= pthread_mutex_init(&mx, &attr); assert(!r); |
| 52 | |
| 53 | r= pthread_create(&child2, NULL, child_fn2, NULL); assert(!r); |
| 54 | r= pthread_create(&child1, NULL, child_fn1, NULL); assert(!r); |
| 55 | |
| 56 | r= pthread_join(child1, NULL); assert(!r); |
| 57 | r= pthread_join(child2, NULL); assert(!r); |
| 58 | |
| 59 | r= pthread_mutex_destroy(&mx); assert(!r); |
| 60 | |
| 61 | return 0; |
| 62 | } |