118 lines
3.3 KiB
C
118 lines
3.3 KiB
C
/*
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* barrier5.c
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*
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*
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* --------------------------------------------------------------------------
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*
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* Pthreads-win32 - POSIX Threads Library for Win32
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* Copyright(C) 1998 John E. Bossom
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* Copyright(C) 1999,2005 Pthreads-win32 contributors
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*
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* Contact Email: rpj@callisto.canberra.edu.au
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*
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* The current list of contributors is contained
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* in the file CONTRIBUTORS included with the source
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* code distribution. The list can also be seen at the
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* following World Wide Web location:
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* http://sources.redhat.com/pthreads-win32/contributors.html
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library in the file COPYING.LIB;
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* if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*
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* --------------------------------------------------------------------------
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*
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* Set up a series of barriers at different heights and test various numbers
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* of threads accessing, especially cases where there are more threads than the
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* barrier height (count), i.e. test contention when the barrier is released.
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*/
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#include "test.h"
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enum {
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NUMTHREADS = 15,
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HEIGHT = 10,
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BARRIERMULTIPLE = 1000
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};
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pthread_barrier_t barrier = NULL;
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pthread_mutex_t mx = PTHREAD_MUTEX_INITIALIZER;
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LONG totalThreadCrossings;
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void *
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func(void * crossings)
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{
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int result;
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int serialThreads = 0;
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while ((LONG)(size_t)crossings >= (LONG)InterlockedIncrement((LPLONG)&totalThreadCrossings))
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{
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result = pthread_barrier_wait(&barrier);
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if (result == PTHREAD_BARRIER_SERIAL_THREAD)
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{
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serialThreads++;
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}
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else if (result != 0)
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{
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printf("Barrier failed: result = %s\n", error_string[result]);
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fflush(stdout);
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return NULL;
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}
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}
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return (void*)(size_t)serialThreads;
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}
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int
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main()
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{
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int i, j;
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void* result;
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int serialThreadsTotal;
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LONG Crossings;
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pthread_t t[NUMTHREADS + 1];
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for (j = 1; j <= NUMTHREADS; j++)
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{
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int height = j<HEIGHT?j:HEIGHT;
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totalThreadCrossings = 0;
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Crossings = height * BARRIERMULTIPLE;
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printf("Threads=%d, Barrier height=%d\n", j, height);
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assert(pthread_barrier_init(&barrier, NULL, height) == 0);
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for (i = 1; i <= j; i++)
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{
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assert(pthread_create(&t[i], NULL, func, (void *)(size_t)Crossings) == 0);
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}
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serialThreadsTotal = 0;
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for (i = 1; i <= j; i++)
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{
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assert(pthread_join(t[i], &result) == 0);
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serialThreadsTotal += (int)(size_t)result;
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}
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assert(serialThreadsTotal == BARRIERMULTIPLE);
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assert(pthread_barrier_destroy(&barrier) == 0);
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}
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assert(pthread_mutex_destroy(&mx) == 0);
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return 0;
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}
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