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1 /*
2  *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
3  *
4  *  Use of this source code is governed by a BSD-style license
5  *  that can be found in the LICENSE file in the root of the source
6  *  tree. An additional intellectual property rights grant can be found
7  *  in the file PATENTS.  All contributing project authors may
8  *  be found in the AUTHORS file in the root of the source tree.
9  */
10 
11 // Various inline functions and macros to fix compilation of 32 bit target
12 // on MSVC with /Wp64 flag enabled.
13 
14 // The original code can be found here:
15 // http://src.chromium.org/svn/trunk/src/base/fix_wp64.h
16 
17 #ifndef WEBRTC_SYSTEM_WRAPPERS_SOURCE_FIX_INTERLOCKED_EXCHANGE_POINTER_WINDOWS_H_
18 #define WEBRTC_SYSTEM_WRAPPERS_SOURCE_FIX_INTERLOCKED_EXCHANGE_POINTER_WINDOWS_H_
19 
20 #include <windows.h>
21 
22 // Platform SDK fixes when building with /Wp64 for a 32 bits target.
23 #if !defined(_WIN64) && defined(_Wp64)
24 
25 #ifdef InterlockedExchangePointer
26 #undef InterlockedExchangePointer
27 // The problem is that the macro provided for InterlockedExchangePointer() is
28 // doing a (LONG) C-style cast that triggers invariably the warning C4312 when
29 // building on 32 bits.
InterlockedExchangePointer(void * volatile * target,void * value)30 inline void* InterlockedExchangePointer(void* volatile* target, void* value) {
31   return reinterpret_cast<void*>(static_cast<LONG_PTR>(InterlockedExchange(
32       reinterpret_cast<volatile LONG*>(target),
33       static_cast<LONG>(reinterpret_cast<LONG_PTR>(value)))));
34 }
35 #endif  // #ifdef InterlockedExchangePointer
36 
37 #endif // #if !defined(_WIN64) && defined(_Wp64)
38 
39 #endif // WEBRTC_SYSTEM_WRAPPERS_SOURCE_FIX_INTERLOCKED_EXCHANGE_POINTER_WINDOWS_H_
40