1 /** Cancel a thread that holds a lock on a mutex. */ 2 3 4 #include <assert.h> 5 #include <pthread.h> 6 #include <stdio.h> 7 8 9 pthread_cond_t s_cond; 10 pthread_mutex_t s_mutex1; 11 pthread_mutex_t s_mutex2; 12 13 14 static void* thread(void* arg) 15 { 16 /* Lock s_mutex2. */ 17 pthread_mutex_lock(&s_mutex2); 18 /* Inform the main thread that s_mutex2 has been locked, and wait for pthread_cancel(). */ 19 pthread_mutex_lock(&s_mutex1); 20 pthread_cond_signal(&s_cond); 21 pthread_cond_wait(&s_cond, &s_mutex1); 22 return 0; 23 } 24 25 int main(int argc, char** argv) 26 { 27 pthread_t tid; 28 29 /* Initialize synchronization objects. */ 30 pthread_cond_init(&s_cond, 0); 31 pthread_mutex_init(&s_mutex1, 0); 32 pthread_mutex_init(&s_mutex2, 0); 33 34 /* Create thread. */ 35 pthread_mutex_lock(&s_mutex1); 36 pthread_create(&tid, 0, &thread, 0); 37 38 /* Wait until the created thread has locked s_mutex2. */ 39 pthread_cond_wait(&s_cond, &s_mutex1); 40 pthread_mutex_unlock(&s_mutex1); 41 42 /* Cancel the created thread. */ 43 pthread_cancel(tid); 44 45 /* Join the created thread. */ 46 pthread_join(tid, 0); 47 48 /* Invoke pthread_cancel() with an invalid thread ID. */ 49 pthread_cancel(tid); 50 51 fprintf(stderr, "Test finished.\n"); 52 53 return 0; 54 } 55
