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authormarha <marha@users.sourceforge.net>2009-06-28 22:07:26 +0000
committermarha <marha@users.sourceforge.net>2009-06-28 22:07:26 +0000
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Diffstat (limited to 'pthreads/pthread_barrier_wait.c')
-rw-r--r--pthreads/pthread_barrier_wait.c99
1 files changed, 99 insertions, 0 deletions
diff --git a/pthreads/pthread_barrier_wait.c b/pthreads/pthread_barrier_wait.c
new file mode 100644
index 000000000..01ae29766
--- /dev/null
+++ b/pthreads/pthread_barrier_wait.c
@@ -0,0 +1,99 @@
+/*
+ * pthread_barrier_wait.c
+ *
+ * Description:
+ * This translation unit implements barrier primitives.
+ *
+ * --------------------------------------------------------------------------
+ *
+ * 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
+ */
+
+#include "pthread.h"
+#include "implement.h"
+
+
+int
+pthread_barrier_wait (pthread_barrier_t * barrier)
+{
+ int result;
+ int step;
+ pthread_barrier_t b;
+
+ if (barrier == NULL || *barrier == (pthread_barrier_t) PTW32_OBJECT_INVALID)
+ {
+ return EINVAL;
+ }
+
+ b = *barrier;
+ step = b->iStep;
+
+ if (0 == InterlockedDecrement ((long *) &(b->nCurrentBarrierHeight)))
+ {
+ /* Must be done before posting the semaphore. */
+ b->nCurrentBarrierHeight = b->nInitialBarrierHeight;
+
+ /*
+ * There is no race condition between the semaphore wait and post
+ * because we are using two alternating semas and all threads have
+ * entered barrier_wait and checked nCurrentBarrierHeight before this
+ * barrier's sema can be posted. Any threads that have not quite
+ * entered sem_wait below when the multiple_post has completed
+ * will nevertheless continue through the semaphore (barrier)
+ * and will not be left stranded.
+ */
+ result = (b->nInitialBarrierHeight > 1
+ ? sem_post_multiple (&(b->semBarrierBreeched[step]),
+ b->nInitialBarrierHeight - 1) : 0);
+ }
+ else
+ {
+ /*
+ * Use the non-cancelable version of sem_wait().
+ */
+ result = ptw32_semwait (&(b->semBarrierBreeched[step]));
+ }
+
+ /*
+ * The first thread across will be the PTHREAD_BARRIER_SERIAL_THREAD.
+ * This also sets up the alternate semaphore as the next barrier.
+ */
+ if (0 == result)
+ {
+ result = ((PTW32_INTERLOCKED_LONG) step ==
+ PTW32_INTERLOCKED_COMPARE_EXCHANGE ((PTW32_INTERLOCKED_LPLONG)
+ & (b->iStep),
+ (PTW32_INTERLOCKED_LONG)
+ (1L - step),
+ (PTW32_INTERLOCKED_LONG)
+ step) ?
+ PTHREAD_BARRIER_SERIAL_THREAD : 0);
+ }
+
+ return (result);
+}