sewardj | b411202 | 2007-11-09 22:49:28 +0000 | [diff] [blame^] | 1 | |
| 2 | /* Expect 5 errors total (4 re cvs, 1 re exiting w/lock.). |
| 3 | Tests passing bogus mutexes to pthread_cond_wait. */ |
| 4 | #define _GNU_SOURCE 1 /* needed by glibc <= 2.3 for pthread_rwlock_* */ |
| 5 | #include <pthread.h> |
| 6 | #include <assert.h> |
| 7 | #include <unistd.h> |
| 8 | #include <semaphore.h> |
| 9 | |
| 10 | pthread_mutex_t mx[4]; |
| 11 | pthread_cond_t cv; |
| 12 | pthread_rwlock_t rwl; |
| 13 | |
| 14 | sem_t quit_now; |
| 15 | |
| 16 | void* rescue_me ( void* uu ) |
| 17 | { |
| 18 | /* wait for, and unblock, the first wait */ |
| 19 | sleep(1); |
| 20 | pthread_cond_signal( &cv ); |
| 21 | |
| 22 | /* wait for, and unblock, the second wait */ |
| 23 | sleep(1); |
| 24 | pthread_cond_signal( &cv ); |
| 25 | |
| 26 | /* wait for, and unblock, the third wait */ |
| 27 | sleep(1); |
| 28 | pthread_cond_signal( &cv ); |
| 29 | |
| 30 | /* wait for, and unblock, the fourth wait */ |
| 31 | sleep(1); |
| 32 | pthread_cond_signal( &cv ); |
| 33 | |
| 34 | sem_wait( &quit_now ); |
| 35 | return NULL; |
| 36 | } |
| 37 | |
| 38 | void* grab_the_lock ( void* uu ) |
| 39 | { |
| 40 | int r= pthread_mutex_lock( &mx[2] ); assert(!r); |
| 41 | sem_wait( &quit_now ); |
| 42 | r= pthread_mutex_unlock( &mx[2] ); assert(!r); |
| 43 | return NULL; |
| 44 | } |
| 45 | |
| 46 | int main ( void ) |
| 47 | { |
| 48 | int r; |
| 49 | pthread_t my_rescuer, grabber; |
| 50 | |
| 51 | r= pthread_mutex_init(&mx[0], NULL); assert(!r); |
| 52 | r= pthread_mutex_init(&mx[1], NULL); assert(!r); |
| 53 | r= pthread_mutex_init(&mx[2], NULL); assert(!r); |
| 54 | r= pthread_mutex_init(&mx[3], NULL); assert(!r); |
| 55 | |
| 56 | r= pthread_cond_init(&cv, NULL); assert(!r); |
| 57 | r= pthread_rwlock_init(&rwl, NULL); assert(!r); |
| 58 | |
| 59 | r= sem_init( &quit_now, 0,0 ); assert(!r); |
| 60 | |
| 61 | r= pthread_create( &grabber, NULL, grab_the_lock, NULL ); assert(!r); |
| 62 | sleep(1); /* let the grabber get there first */ |
| 63 | |
| 64 | r= pthread_create( &my_rescuer, NULL, rescue_me, NULL ); assert(!r); |
| 65 | /* Do stupid things and hope that rescue_me gets us out of |
| 66 | trouble */ |
| 67 | |
| 68 | /* mx is bogus */ |
| 69 | r= pthread_cond_wait(&cv, (pthread_mutex_t*)(1 + (char*)&mx[0]) ); |
| 70 | |
| 71 | /* mx is not locked */ |
| 72 | r= pthread_cond_wait(&cv, &mx[0]); |
| 73 | |
| 74 | /* wrong flavour of lock */ |
| 75 | r= pthread_cond_wait(&cv, (pthread_mutex_t*)&rwl ); |
| 76 | |
| 77 | /* mx is held by someone else. */ |
| 78 | r= pthread_cond_wait(&cv, &mx[2] ); |
| 79 | |
| 80 | r= sem_post( &quit_now ); assert(!r); |
| 81 | r= sem_post( &quit_now ); assert(!r); |
| 82 | |
| 83 | r= pthread_join( my_rescuer, NULL ); assert(!r); |
| 84 | r= pthread_join( grabber, NULL ); assert(!r); |
| 85 | return 0; |
| 86 | } |