pth_detached_sem.c revision 55df6e70378e0785faf11297ed247ed4dab097e5 
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
18static sem_t s_sem;
19
20
21static void increment_finished_count()
22{
23  sem_post(&s_sem);
24}
25
26static void* thread_func1(void* arg)
27{
28  write(STDOUT_FILENO, ".", 1);
29  increment_finished_count();
30  return 0;
31}
32
33static 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
41int 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
86  sem_destroy(&s_sem);
87
88  return 0;
89}
90