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/*
* barrier5.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
*
* --------------------------------------------------------------------------
*
* Set up a series of barriers at different heights and test various numbers
* of threads accessing, especially cases where there are more threads than the
* barrier height (count), i.e. test contention when the barrier is released.
*/
#include "test.h"
enum {
NUMTHREADS = 15,
HEIGHT = 10,
BARRIERMULTIPLE = 1000
};
pthread_barrier_t barrier = NULL;
pthread_mutex_t mx = PTHREAD_MUTEX_INITIALIZER;
LONG totalThreadCrossings;
void *
func(void * crossings)
{
int result;
int serialThreads = 0;
while ((LONG)(size_t)crossings >= (LONG)InterlockedIncrement((LPLONG)&totalThreadCrossings))
{
result = pthread_barrier_wait(&barrier);
if (result == PTHREAD_BARRIER_SERIAL_THREAD)
{
serialThreads++;
}
else if (result != 0)
{
printf("Barrier failed: result = %s\n", error_string[result]);
fflush(stdout);
return NULL;
}
}
return (void*)(size_t)serialThreads;
}
int
main()
{
int i, j;
void* result;
int serialThreadsTotal;
LONG Crossings;
pthread_t t[NUMTHREADS + 1];
for (j = 1; j <= NUMTHREADS; j++)
{
int height = j<HEIGHT?j:HEIGHT;
totalThreadCrossings = 0;
Crossings = height * BARRIERMULTIPLE;
printf("Threads=%d, Barrier height=%d\n", j, height);
assert(pthread_barrier_init(&barrier, NULL, height) == 0);
for (i = 1; i <= j; i++)
{
assert(pthread_create(&t[i], NULL, func, (void *)(size_t)Crossings) == 0);
}
serialThreadsTotal = 0;
for (i = 1; i <= j; i++)
{
assert(pthread_join(t[i], &result) == 0);
serialThreadsTotal += (int)(size_t)result;
}
assert(serialThreadsTotal == BARRIERMULTIPLE);
assert(pthread_barrier_destroy(&barrier) == 0);
}
assert(pthread_mutex_destroy(&mx) == 0);
return 0;
}
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