Add AMTL files

public/amtl/am-refcounting-threadsafe.h

@@ -0,0 +1,68 @@
+// vim: set sts=8 ts=2 sw=2 tw=99 et:
+//
+// Copyright (C) 2013, David Anderson and AlliedModders LLC
+// All rights reserved.
+// 
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+// 
+//  * Redistributions of source code must retain the above copyright notice, this
+//    list of conditions and the following disclaimer.
+//  * Redistributions in binary form must reproduce the above copyright notice,
+//    this list of conditions and the following disclaimer in the documentation
+//    and/or other materials provided with the distribution.
+//  * Neither the name of AlliedModders LLC nor the names of its contributors
+//    may be used to endorse or promote products derived from this software
+//    without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef _include_amtl_ts_refcounting_h_
+#define _include_amtl_ts_refcounting_h_
+
+#include <am-refcounting.h>
+#include <am-atomics.h>
+
+namespace ke {
+
+template <typename T>
+class RefcountedThreadsafe
+{
+  public:
+    RefcountedThreadsafe()
+     : refcount_(1)
+    {
+    }
+
+    void AddRef() {
+      refcount_.increment();
+    }
+    bool Release() {
+        if (!refcount_.decrement()) {
+            delete static_cast<T *>(this);
+            return false;
+        }
+        return true;
+    }
+
+  protected:
+    ~RefcountedThreadsafe() {
+    }
+
+  private:
+    AtomicRefCount refcount_;
+};
+
+} // namespace ke
+
+#endif // _include_amtl_ts_refcounting_h_