1 2 /* Check that an error is reported for various kinds of bogus 3 pthread_mutex_unlock calls. */ 4 5 #include <pthread.h> 6 #include <stdio.h> 7 #include <stdlib.h> 8 9 void* child_fn ( void* arg ) 10 { 11 pthread_mutex_unlock( (pthread_mutex_t*)arg ); /* ERROR */ 12 return NULL; 13 } 14 15 void nearly_main ( void ) 16 { 17 pthread_t child; 18 pthread_mutex_t mx1, mx2; 19 int bogus[100], i; 20 /* fill bogus with values which will cause glibc's pth_mx_unlock to fail */ 21 for (i = 0; i < 100; i++) bogus[i] = 0xFFFFFFFF; 22 /* Unlocking a lock that is already unlocked */ 23 pthread_mutex_init( &mx1, NULL ); 24 pthread_mutex_lock( &mx1 ); 25 pthread_mutex_unlock( &mx1 ); 26 27 pthread_mutex_unlock( &mx1 ); /* ERROR */ 28 29 /* Unlocking a lock that is held by a different thread */ 30 31 pthread_mutex_init( &mx2, NULL ); 32 pthread_mutex_lock( &mx2 ); 33 // start child and get it to unlock this lock 34 35 pthread_create( &child, NULL, child_fn, (void*)&mx2 ); 36 /* child runs and attempts to unlock our lock. Error 37 is reported in child_fn. */ 38 pthread_join(child, NULL ); 39 40 /* Unlocking a totally bogus lock. */ 41 pthread_mutex_unlock( (pthread_mutex_t*) &bogus[50] ); /* ERROR */ 42 43 /* Now we get a freeing-locked-lock error, since the stack 44 frame is removed whilst mx2 is still locked. */ 45 } 46 47 int main ( void ) 48 { 49 nearly_main(); fprintf(stderr, "---------------------\n" ); 50 nearly_main(); 51 return 0; 52 } 53
