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/* Test case for C-c sent to threads with pending signals.  Before I

   even get there, creating a thread and sending it a signal before it

   has a chance to run leads to an internal error in GDB.  We need to

   record that there's a pending SIGSTOP, so that we'll ignore it

   later, and pass the current signal back to the thread.

   The fork/vfork case has similar trouble but that's even harder

   to get around.  We may need to send a SIGCONT to cancel out the

   SIGSTOP.  Different kernels may do different things if the thread

   is stopped by ptrace and sent a SIGSTOP.  */

#include <stdio.h>

#include <unistd.h>

#include <stdlib.h>

#include <pthread.h>

#include <signal.h>

/* Loop long enough for GDB to send a few signals of its own, but

   don't hang around eating CPU forever if something goes wrong during

   testing.  */

#define NSIGS 10000000

pthread_barrier_t barrier;

void

handler (int sig)

{

  ;

}

pthread_t main_thread;

pthread_t child_thread, child_thread_two;

void *

child_two (void *arg)

{

  int i;

  pthread_barrier_wait (&barrier);

  for (i = 0; i < NSIGS; i++)

    pthread_kill (child_thread, SIGUSR1);

}

void *

thread_function (void *arg)

{

  int i;

  pthread_barrier_wait (&barrier);

  for (i = 0; i < NSIGS; i++)

    pthread_kill (child_thread_two, SIGUSR2);

}

int main()

{

  int i;

  signal (SIGUSR1, handler);

  signal (SIGUSR2, handler);

  pthread_barrier_init (&barrier, NULL, 3);

  main_thread = pthread_self ();

  pthread_create (&child_thread, NULL, thread_function, NULL);

  pthread_create (&child_thread_two, NULL, child_two, NULL);

  pthread_barrier_wait (&barrier);

  for (i = 0; i < NSIGS; i++)

    pthread_kill (child_thread_two, SIGUSR1);

  pthread_join (child_thread, NULL);

  exit (0);

}