1 files changed, 72 insertions, 0 deletions
diff --git a/src/system_wrappers/source/atomic32_win.cc b/src/system_wrappers/source/atomic32_win.cc
new file mode 100644
index 0000000000..2fa9d3dd59
--- /dev/null
+++ b/src/system_wrappers/source/atomic32_win.cc
@@ -0,0 +1,72 @@
+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "atomic32.h"
+
+#include <assert.h>
+#include <windows.h>
+
+#include "common_types.h"
+#include "compile_assert.h"
+
+namespace webrtc {
+
+Atomic32::Atomic32(WebRtc_Word32 initialValue) : _value(initialValue)
+{
+    // Make sure that the counter variable we're using is of the same size
+    // as what the API expects.
+    COMPILE_ASSERT(sizeof(_value) == sizeof(LONG));
+    assert(Is32bitAligned());
+}
+
+Atomic32::~Atomic32()
+{
+}
+
+WebRtc_Word32 Atomic32::operator++()
+{
+    return static_cast<WebRtc_Word32>(InterlockedIncrement(
+        reinterpret_cast<volatile LONG*>(&_value)));
+}
+
+WebRtc_Word32 Atomic32::operator--()
+{
+    return static_cast<WebRtc_Word32>(InterlockedDecrement(
+        reinterpret_cast<volatile LONG*>(&_value)));
+}
+
+WebRtc_Word32 Atomic32::operator+=(WebRtc_Word32 value)
+{
+    return InterlockedExchangeAdd(reinterpret_cast<volatile LONG*>(&_value),
+                                  value);
+}
+
+WebRtc_Word32 Atomic32::operator-=(WebRtc_Word32 value)
+{
+    return InterlockedExchangeAdd(reinterpret_cast<volatile LONG*>(&_value),
+                                  -value);
+}
+
+bool Atomic32::CompareExchange(WebRtc_Word32 newValue,
+                               WebRtc_Word32 compareValue)
+{
+    const LONG oldValue = InterlockedCompareExchange(
+          reinterpret_cast<volatile LONG*>(&_value),
+          newValue,
+          compareValue);
+    // If the old value and the compare value is the same an exchange happened.
+    return (oldValue == compareValue);
+}
+
+WebRtc_Word32 Atomic32::Value() const
+{
+    return _value;
+}
+}  // namespace webrtc