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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
+ *
+ * --------------------------------------------------------------------------
+ *
+ * Declare a single barrier object, set up a sequence of
+ * barrier points to prove lockstepness, and then destroy it.
+ *
+ */
+
+#include "test.h"
+
+enum {
+ NUMTHREADS = 16,
+ BARRIERS = 10000
+};
+
+pthread_barrier_t barrier = NULL;
+pthread_mutex_t mx = PTHREAD_MUTEX_INITIALIZER;
+
+int barrierReleases[BARRIERS + 1];
+
+void *
+func(void * barrierHeight)
+{
+ int i;
+ int result;
+ int serialThreads = 0;
+
+ for (i = 1; i < BARRIERS; i++)
+ {
+ result = pthread_barrier_wait(&barrier);
+
+ assert(pthread_mutex_lock(&mx) == 0);
+ barrierReleases[i]++;
+ assert(pthread_mutex_unlock(&mx) == 0);
+ /*
+ * Confirm the correct number of releases from the previous
+ * barrier. We can't do the current barrier yet because there may
+ * still be threads waking up.
+ */
+ if (result == PTHREAD_BARRIER_SERIAL_THREAD)
+ {
+ serialThreads++;
+ assert(barrierReleases[i - 1] == (int) barrierHeight);
+ barrierReleases[i + 1] = 0;
+ }
+ else if (result != 0)
+ {
+ printf("Barrier failed: result = %s\n", error_string[result]);
+ fflush(stdout);
+ return NULL;
+ }
+ }
+
+ return (void *) serialThreads;
+}
+
+int
+main()
+{
+ int i, j;
+ int result;
+ int serialThreadsTotal;
+ pthread_t t[NUMTHREADS + 1];
+
+ for (j = 1; j <= NUMTHREADS; j++)
+ {
+ printf("Barrier height = %d\n", j);
+
+ barrierReleases[0] = j;
+ barrierReleases[1] = 0;
+
+ assert(pthread_barrier_init(&barrier, NULL, j) == 0);
+
+ for (i = 1; i <= j; i++)
+ {
+ assert(pthread_create(&t[i], NULL, func, (void *) j) == 0);
+ }
+
+ serialThreadsTotal = 0;
+ for (i = 1; i <= j; i++)
+ {
+ assert(pthread_join(t[i], (void **) &result) == 0);
+ serialThreadsTotal += result;
+ }
+
+ assert(serialThreadsTotal == BARRIERS - 1);
+ assert(barrierReleases[BARRIERS - 1] == j);
+ assert(barrierReleases[BARRIERS] == 0);
+
+ assert(pthread_barrier_destroy(&barrier) == 0);
+ }
+
+ assert(pthread_mutex_destroy(&mx) == 0);
+
+ return 0;
+}