1 2 #include <pthread.h> 3 #include <stdio.h> 4 #include <stdlib.h> 5 #include <assert.h> 6 7 /* The simplest possible test that triggers a lock order acquisition 8 error. */ 9 main(void)10int main ( void ) 11 { 12 int r; 13 pthread_mutex_t mx1, mx2; 14 r = pthread_mutex_init( &mx1, NULL ); assert(r==0); 15 r = pthread_mutex_init( &mx2, NULL ); assert(r==0); 16 17 r = pthread_mutex_lock( &mx1 ); assert(r==0); 18 r = pthread_mutex_lock( &mx2 ); assert(r==0); 19 20 r = pthread_mutex_unlock( &mx1 ); assert(r==0); 21 r = pthread_mutex_unlock( &mx2 ); assert(r==0); 22 23 r = pthread_mutex_lock( &mx2 ); assert(r==0); /* error */ 24 r = pthread_mutex_lock( &mx1 ); assert(r==0); 25 26 r = pthread_mutex_unlock( &mx1 ); assert(r==0); 27 r = pthread_mutex_unlock( &mx2 ); assert(r==0); 28 29 r = pthread_mutex_destroy( &mx1 ); 30 r = pthread_mutex_destroy( &mx2 ); 31 32 return 0; 33 } 34