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/* Test case for hand function calls interrupted by a signal in another thread.

   Copyright 2008, 2010 Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3 of the License, or

   (at your option) any later version.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include <pthread.h>

#include <signal.h>

#include <stdio.h>

#include <stdlib.h>

#include <time.h>

#include <unistd.h>

#ifndef NR_THREADS

#define NR_THREADS 4

#endif

pthread_t threads[NR_THREADS];

/* Number of threads currently running.  */

int thread_count;

pthread_mutex_t thread_count_mutex;

pthread_cond_t thread_count_condvar;

sig_atomic_t sigabrt_received;

void

incr_thread_count (void)

{

  pthread_mutex_lock (&thread_count_mutex);

  ++thread_count;

  if (thread_count == NR_THREADS)

    pthread_cond_signal (&thread_count_condvar);

  pthread_mutex_unlock (&thread_count_mutex);

}

void

cond_wait (pthread_cond_t *cond, pthread_mutex_t *mut)

{

  pthread_mutex_lock (mut);

  pthread_cond_wait (cond, mut);

  pthread_mutex_unlock (mut);

}

void

noreturn (void)

{

  pthread_mutex_t mut;

  pthread_cond_t cond;

  pthread_mutex_init (&mut, NULL);

  pthread_cond_init (&cond, NULL);

  /* Wait for a condition that will never be signaled, so we effectively

     block the thread here.  */

  cond_wait (&cond, &mut);

}

void *

thread_entry (void *unused)

{

  incr_thread_count ();

  noreturn ();

}

void

sigabrt_handler (int signo)

{

  sigabrt_received = 1;

}

/* Helper to test a hand-call being "interrupted" by a signal on another

   thread.  */

void

hand_call_with_signal (void)

{

  const struct timespec ts = { 0, 10000000 }; /* 0.01 sec */

  sigabrt_received = 0;

  pthread_kill (threads[0], SIGABRT);

  while (! sigabrt_received)

    nanosleep (&ts, NULL);

}

/* Wait until all threads are running.  */

void

wait_all_threads_running (void)

{

  pthread_mutex_lock (&thread_count_mutex);

  if (thread_count == NR_THREADS)

    {

      pthread_mutex_unlock (&thread_count_mutex);

      return;

    }

  pthread_cond_wait (&thread_count_condvar, &thread_count_mutex);

  if (thread_count == NR_THREADS)

    {

      pthread_mutex_unlock (&thread_count_mutex);

      return;

    }

  pthread_mutex_unlock (&thread_count_mutex);

  printf ("failed waiting for all threads to start\n");

  abort ();

}

/* Called when all threads are running.

   Easy place for a breakpoint.  */

void

all_threads_running (void)

{

}

int

main (void)

{

  int i;

  signal (SIGABRT, sigabrt_handler);

  pthread_mutex_init (&thread_count_mutex, NULL);

  pthread_cond_init (&thread_count_condvar, NULL);

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

    pthread_create (&threads[i], NULL, thread_entry, NULL);

  wait_all_threads_running ();

  all_threads_running ();

  return 0;

}