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/*
* OXT - OS eXtensions for boosT
* Provides important functionality necessary for writing robust server software.
*
* Copyright (c) 2010 Phusion
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef _OXT_MACROS_HPP_
#define _OXT_MACROS_HPP_
/**
* Specialized macros.
*
* These macros provide more specialized features which are not needed
* so often by application programmers.
*/
#if (defined(__GNUC__) && (__GNUC__ > 2) && !defined(OXT_DEBUG)) || defined(IN_DOXYGEN)
/**
* Indicate that the given expression is likely to be true.
* This allows the CPU to better perform branch prediction.
*
* Defining OXT_DEBUG will cause this macro to become an
* empty stub.
*/
#define OXT_LIKELY(expr) __builtin_expect((expr), 1)
/**
* Indicate that the given expression is likely to be false.
* This allows the CPU to better perform branch prediction.
*
* Defining OXT_DEBUG will cause this macro to become an
* empty stub.
*/
#define OXT_UNLIKELY(expr) __builtin_expect((expr), 0)
#else
#define OXT_LIKELY(expr) expr
#define OXT_UNLIKELY(expr) expr
#endif
#endif /* _OXT_MACROS_HPP_ */
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