1 /** 2 * Test whether detached threads are handled properly. 3 * This test program is based on pth_detached.c, with the difference that 4 * in this test program the main thread uses a counting semaphore instead 5 * of a counter protected by a mutex to wait until all detached threads 6 * finished. 7 */ 8 9 10 #include <assert.h> 11 #include <pthread.h> 12 #include <semaphore.h> 13 #include <stdio.h> 14 #include <stdlib.h> 15 #include <unistd.h> 16 17 18 static sem_t s_sem; 19 20 21 static void increment_finished_count() 22 { 23 sem_post(&s_sem); 24 } 25 26 static void* thread_func1(void* arg) 27 { 28 write(STDOUT_FILENO, ".", 1); 29 increment_finished_count(); 30 return 0; 31 } 32 33 static void* thread_func2(void* arg) 34 { 35 pthread_detach(pthread_self()); 36 write(STDOUT_FILENO, ".", 1); 37 increment_finished_count(); 38 return 0; 39 } 40 41 int main(int argc, char** argv) 42 { 43 const int count1 = argc > 1 ? atoi(argv[1]) : 100; 44 const int count2 = argc > 2 ? atoi(argv[2]) : 100; 45 int thread_arg[count1 > count2 ? count1 : count2]; 46 int i; 47 int detachstate; 48 pthread_attr_t attr; 49 50 for (i = 0; i < count1 || i < count2; i++) 51 thread_arg[i] = i; 52 53 sem_init(&s_sem, 0, 0); 54 55 pthread_attr_init(&attr); 56 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); 57 assert(pthread_attr_getdetachstate(&attr, &detachstate) == 0); 58 assert(detachstate == PTHREAD_CREATE_DETACHED); 59 pthread_attr_setstacksize(&attr, 16384); 60 // Create count1 detached threads by setting the "detached" property via 61 // thread attributes. 62 for (i = 0; i < count1; i++) 63 { 64 pthread_t thread; 65 pthread_create(&thread, &attr, thread_func1, &thread_arg[i]); 66 } 67 // Create count2 detached threads by letting the threads detach themselves. 68 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE); 69 assert(pthread_attr_getdetachstate(&attr, &detachstate) == 0); 70 assert(detachstate == PTHREAD_CREATE_JOINABLE); 71 for (i = 0; i < count2; i++) 72 { 73 pthread_t thread; 74 pthread_create(&thread, &attr, thread_func2, &thread_arg[i]); 75 } 76 pthread_attr_destroy(&attr); 77 78 // Wait until all detached threads have written their output to stdout. 79 for (i = 0; i < count1 + count2; i++) 80 { 81 sem_wait(&s_sem); 82 } 83 84 write(STDOUT_FILENO, "\n", 1); 85 fprintf(stderr, "Done.\n"); 86 87 sem_destroy(&s_sem); 88 89 return 0; 90 } 91
