mingw-w64-libraries/winpthreads/tests_pthread/count1.c

/*
 * count1.c
 *
 *
 * --------------------------------------------------------------------------
 *
 *      Pthreads-win32 - POSIX Threads Library for Win32
 *      Copyright(C) 1998 John E. Bossom
 *      Copyright(C) 1999,2005 Pthreads-win32 contributors
 * 
 *      Contact Email: rpj@callisto.canberra.edu.au
 * 
 *      The current list of contributors is contained
 *      in the file CONTRIBUTORS included with the source
 *      code distribution. The list can also be seen at the
 *      following World Wide Web location:
 *      http://sources.redhat.com/pthreads-win32/contributors.html
 * 
 *      This library is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU Lesser General Public
 *      License as published by the Free Software Foundation; either
 *      version 2 of the License, or (at your option) any later version.
 * 
 *      This library 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
 *      Lesser General Public License for more details.
 * 
 *      You should have received a copy of the GNU Lesser General Public
 *      License along with this library in the file COPYING.LIB;
 *      if not, write to the Free Software Foundation, Inc.,
 *      59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
 *
 * --------------------------------------------------------------------------
 *
 * Description:
 * Test some basic assertions about the number of threads at runtime.
 */

#include "test.h"

#define NUMTHREADS (30)

static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
static pthread_t threads[NUMTHREADS];
static unsigned numThreads = 0;

void *
myfunc(void *arg)
{
  pthread_mutex_lock(&lock);
  numThreads++;
  pthread_mutex_unlock(&lock);

  Sleep(1000);
  return 0;
}
int
main()
{
  int i;
  int maxThreads = sizeof(threads) / sizeof(pthread_t);

  /*
   * Spawn NUMTHREADS threads. Each thread should increment the
   * numThreads variable, sleep for one second.
   */
  for (i = 0; i < maxThreads; i++)
    {
      assert(pthread_create(&threads[i], NULL, myfunc, 0) == 0);
    }
  
  /*
   * Wait for all the threads to exit.
   */
  for (i = 0; i < maxThreads; i++)
    {
      assert(pthread_join(threads[i], NULL) == 0);
    }

  /* 
   * Check the number of threads created.
   */
  assert((int) numThreads == maxThreads);
  
  /*
   * Success.
   */
  return 0;
}