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/*
* barrier4.c
*
*
* Pthreads-win32 - POSIX Threads Library for Win32
* Copyright (C) 1998 Ben Elliston and Ross Johnson
* Copyright (C) 1999,2000,2001 Ross Johnson
*
* Contact Email: rpj@ise.canberra.edu.au
*
* 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 2.1 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; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* --------------------------------------------------------------------------
*
* Declare a single barrier object, multiple wait on it,
* and then destroy it.
*
*/
#include "test.h"
enum {
NUMTHREADS = 16
};
pthread_barrier_t barrier = NULL;
pthread_mutex_t mx = PTHREAD_MUTEX_INITIALIZER;
static int serialThreadCount = 0;
static int otherThreadCount = 0;
void *
func(void * arg)
{
int result = pthread_barrier_wait(&barrier);
assert(pthread_mutex_lock(&mx) == 0);
// printf("Barrier wait returned %d [%d]\n", result, WAIT_FAILED);
// fflush(stdout);
if (result == PTHREAD_BARRIER_SERIAL_THREAD)
{
serialThreadCount++;
}
else if (0 == result)
{
otherThreadCount++;
}
else
{
printf("Barrier wait failed: error = %s\n", error_string[result]);
fflush(stdout);
return NULL;
}
assert(pthread_mutex_unlock(&mx) == 0);
return NULL;
}
int
main()
{
int i, j;
pthread_t t[NUMTHREADS + 1];
for (j = 1; j <= NUMTHREADS; j++)
{
printf("Barrier height = %d\n", j);
serialThreadCount = 0;
assert(pthread_barrier_init(&barrier, NULL, j) == 0);
for (i = 1; i <= j; i++)
{
assert(pthread_create(&t[i], NULL, func, NULL) == 0);
}
for (i = 1; i <= j; i++)
{
assert(pthread_join(t[i], NULL) == 0);
}
assert(serialThreadCount == 1);
assert(pthread_barrier_destroy(&barrier) == 0);
}
assert(pthread_mutex_destroy(&mx) == 0);
return 0;
}