git-svn-id: svn://qnap.local/TwoTerm/trunk@1650 5590a31f-7b70-45f8-8c82-aa3a8e5f4507

Benaphore.cpp

@@ -0,0 +1,48 @@
+/*
+ *  Benaphore.cpp
+ *  Blue Box
+ *
+ *  Created by Kelvin Sherlock on 11/29/2009.
+ *  Copyright 2009 Kelvin W Sherlock LLC. All rights reserved.
+ *
+ */
+
+#include "Benaphore.h"
+
+#include <libkern/OSAtomic.h>
+#include <mach/semaphore.h>
+#include <mach/task.h>
+#include <mach/mach_init.h>
+
+#include <cstdio>
+
+Benaphore::Benaphore()
+{
+    _atom = 0;
+    semaphore_create(mach_task_self(), (semaphore_t *)&_sem, SYNC_POLICY_FIFO, 0);
+}
+
+Benaphore::~Benaphore()
+{
+    semaphore_destroy(mach_task_self(), (semaphore_t)_sem);
+
+}
+void Benaphore::lock()
+{
+    // returns new value
+    if (OSAtomicIncrement32Barrier(&_atom) > 1)
+    {
+        fprintf(stderr, "waiting %u\n", _atom);
+        semaphore_wait((semaphore_t)_sem);
+    }
+}
+
+void Benaphore::unlock()
+{
+    if (OSAtomicDecrement32Barrier(&_atom) > 0)
+    {
+        fprintf(stderr, "releasing %u\n", _atom);
+        semaphore_signal((semaphore_t)_sem);
+    }
+        
+}