From a416ab17ecf9f2cb0f1e3f7bd645a8d1ce690ca2 Mon Sep 17 00:00:00 2001
From: rpj <rpj>
Date: Mon, 18 Feb 2002 03:16:52 +0000
Subject: Major reorganisation of source code; new routine and tests added.

---
 pthread_barrier_init.c | 84 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 pthread_barrier_init.c

(limited to 'pthread_barrier_init.c')

diff --git a/pthread_barrier_init.c b/pthread_barrier_init.c
new file mode 100644
index 0000000..44b96fc
--- /dev/null
+++ b/pthread_barrier_init.c
@@ -0,0 +1,84 @@
+/*
+ * pthread_barrier_init.c
+ *
+ * Description:
+ * This translation unit implements barrier primitives.
+ *
+ * --------------------------------------------------------------------------
+ *
+ *      Pthreads-win32 - POSIX Threads Library for Win32
+ *      Copyright(C) 1998 John E. Bossom
+ *      Copyright(C) 1999,2002 Pthreads-win32 contributors
+ *
+ *      Contact Email: rpj@ise.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_init(pthread_barrier_t * barrier,
+                     const pthread_barrierattr_t * attr,
+                     unsigned int count)
+{
+  pthread_barrier_t b;
+
+  if (barrier == NULL || count == 0)
+    {
+      return EINVAL;
+    }
+
+  if (NULL != (b = (pthread_barrier_t) calloc(1, sizeof(*b))))
+    {
+      b->pshared = (attr != NULL && *attr != NULL
+                    ? (*attr)->pshared
+                    : PTHREAD_PROCESS_PRIVATE);
+
+      b->nCurrentBarrierHeight = b->nInitialBarrierHeight = count;
+      b->iStep = 0;
+
+      /*
+       * Two semaphores are used in the same way as two stepping
+       * stones might be used in crossing a stream. Once all
+       * threads are safely on one stone, the other stone can
+       * be moved ahead, and the threads can start moving to it.
+       * If some threads decide to eat their lunch before moving
+       * then the other threads have to wait.
+       */
+      if (0 == sem_init(&(b->semBarrierBreeched[0]), b->pshared, 0))
+        {
+          if (0 == sem_init(&(b->semBarrierBreeched[1]), b->pshared, 0))
+            {
+              *barrier = b;
+              return 0;
+            }
+          (void) sem_destroy(&(b->semBarrierBreeched[0]));
+        }
+      (void) free(b);
+    }
+
+  return ENOMEM;
+}
+
-- 
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