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/*
* OXT - OS eXtensions for boosT
* Provides important functionality necessary for writing robust server software.
*
* Copyright (c) 2010-2017 Phusion Holding B.V.
*
* 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_SPIN_LOCK_HPP_
#define _OXT_SPIN_LOCK_HPP_
#include "macros.hpp"
// These operating systems don't support pthread spin locks:
// - OpenBSD 4.3 (last checked: July 22, 2008)
// - Solaris 9 (last checked: July 22, 2008)
// - MacOS X (last checked: July 22, 2012)
#if defined(__OpenBSD__) || defined(__SOLARIS9__) || defined(__APPLE__)
#define OXT_NO_PTHREAD_SPINLOCKS
#endif
#if defined(__APPLE__)
#include "detail/spin_lock_darwin.hpp"
#elif (OXT_GCC_VERSION > 40100 && (defined(__i386__) || defined(__x86_64__))) || defined(IN_DOXYGEN)
// GCC 4.0 doesn't support __sync instructions while GCC 4.2
// does. I'm not sure whether support for it started in 4.1 or
// 4.2, so the above version check may have to be changed later.
#include "detail/spin_lock_gcc_x86.hpp"
#elif !defined(WIN32) && !defined(OXT_NO_PTHREAD_SPINLOCKS)
#include "detail/spin_lock_pthreads.hpp"
#else
#include "detail/spin_lock_portable.hpp"
#endif
#endif /* _OXT_SPIN_LOCK_HPP_ */
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