aboutsummaryrefslogtreecommitdiff
path: root/pthreads/tests/barrier5.c
diff options
context:
space:
mode:
Diffstat (limited to 'pthreads/tests/barrier5.c')
-rw-r--r--pthreads/tests/barrier5.c246
1 files changed, 118 insertions, 128 deletions
diff --git a/pthreads/tests/barrier5.c b/pthreads/tests/barrier5.c
index 5b598c9d9..42c2e36d9 100644
--- a/pthreads/tests/barrier5.c
+++ b/pthreads/tests/barrier5.c
@@ -1,128 +1,118 @@
-/*
- * 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;
-}
+/*
+ * 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)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 *) serialThreads;
+}
+
+int
+main()
+{
+ int i, j;
+ int 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 *) Crossings) == 0);
+ }
+
+ serialThreadsTotal = 0;
+ for (i = 1; i <= j; i++)
+ {
+ assert(pthread_join(t[i], (void **) &result) == 0);
+ serialThreadsTotal += result;
+ }
+
+ assert(serialThreadsTotal == BARRIERMULTIPLE);
+
+ assert(pthread_barrier_destroy(&barrier) == 0);
+ }
+
+ assert(pthread_mutex_destroy(&mx) == 0);
+
+ return 0;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-08 19:23:25 +0000