1/* Test case for C-c sent to threads with pending signals.  Before I
2   even get there, creating a thread and sending it a signal before it
3   has a chance to run leads to an internal error in GDB.  We need to
4   record that there's a pending SIGSTOP, so that we'll ignore it
5   later, and pass the current signal back to the thread.
6
7   The fork/vfork case has similar trouble but that's even harder
8   to get around.  We may need to send a SIGCONT to cancel out the
9   SIGSTOP.  Different kernels may do different things if the thread
10   is stopped by ptrace and sent a SIGSTOP.  */
11
12#include <stdio.h>
13#include <unistd.h>
14#include <stdlib.h>
15#include <pthread.h>
16#include <signal.h>
17
18/* Loop long enough for GDB to send a few signals of its own, but
19   don't hang around eating CPU forever if something goes wrong during
20   testing.  */
21#define NSIGS 10000000
22
23pthread_barrier_t barrier;
24
25void
26handler (int sig)
27{
28  ;
29}
30
31pthread_t main_thread;
32pthread_t child_thread, child_thread_two;
33
34void *
35child_two (void *arg)
36{
37  int i;
38
39  pthread_barrier_wait (&barrier);
40
41  for (i = 0; i < NSIGS; i++)
42    pthread_kill (child_thread, SIGUSR1);
43}
44
45void *
46thread_function (void *arg)
47{
48  int i;
49
50  pthread_barrier_wait (&barrier);
51
52  for (i = 0; i < NSIGS; i++)
53    pthread_kill (child_thread_two, SIGUSR2);
54}
55
56int main()
57{
58  int i;
59
60  signal (SIGUSR1, handler);
61  signal (SIGUSR2, handler);
62
63  pthread_barrier_init (&barrier, NULL, 3);
64
65  main_thread = pthread_self ();
66  pthread_create (&child_thread, NULL, thread_function, NULL);
67  pthread_create (&child_thread_two, NULL, child_two, NULL);
68
69  pthread_barrier_wait (&barrier);
70
71  for (i = 0; i < NSIGS; i++)
72    pthread_kill (child_thread_two, SIGUSR1);
73
74  pthread_join (child_thread, NULL);
75
76  exit (0);
77}
78