190 lines
4.5 KiB
C++
190 lines
4.5 KiB
C++
/*
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AngelCode Scripting Library
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Copyright (c) 2003-2017 Andreas Jonsson
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any
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damages arising from the use of this software.
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Permission is granted to anyone to use this software for any
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purpose, including commercial applications, and to alter it and
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redistribute it freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you
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must not claim that you wrote the original software. If you use
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this software in a product, an acknowledgment in the product
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documentation would be appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and
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must not be misrepresented as being the original software.
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3. This notice may not be removed or altered from any source
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distribution.
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The original version of this library can be located at:
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http://www.angelcode.com/angelscript/
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Andreas Jonsson
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andreas@angelcode.com
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*/
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//
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// as_criticalsection.h
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//
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// Classes for multi threading support
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//
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#ifndef AS_CRITICALSECTION_H
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#define AS_CRITICALSECTION_H
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#include "as_config.h"
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BEGIN_AS_NAMESPACE
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#ifdef AS_NO_THREADS
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#define DECLARECRITICALSECTION(x)
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#define ENTERCRITICALSECTION(x)
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#define LEAVECRITICALSECTION(x)
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inline bool tryEnter() { return true; }
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#define TRYENTERCRITICALSECTION(x) tryEnter()
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#define DECLAREREADWRITELOCK(x)
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#define ACQUIREEXCLUSIVE(x)
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#define RELEASEEXCLUSIVE(x)
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#define ACQUIRESHARED(x)
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#define RELEASESHARED(x)
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#else
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#define DECLARECRITICALSECTION(x) asCThreadCriticalSection x;
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#define ENTERCRITICALSECTION(x) x.Enter()
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#define LEAVECRITICALSECTION(x) x.Leave()
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#define TRYENTERCRITICALSECTION(x) x.TryEnter()
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#define DECLAREREADWRITELOCK(x) asCThreadReadWriteLock x;
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#define ACQUIREEXCLUSIVE(x) x.AcquireExclusive()
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#define RELEASEEXCLUSIVE(x) x.ReleaseExclusive()
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#define ACQUIRESHARED(x) x.AcquireShared()
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#define RELEASESHARED(x) x.ReleaseShared()
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#ifdef AS_POSIX_THREADS
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END_AS_NAMESPACE
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#include <pthread.h>
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BEGIN_AS_NAMESPACE
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class asCThreadCriticalSection
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{
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public:
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asCThreadCriticalSection();
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~asCThreadCriticalSection();
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void Enter();
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void Leave();
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bool TryEnter();
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protected:
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pthread_mutex_t cs;
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};
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class asCThreadReadWriteLock
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{
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public:
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asCThreadReadWriteLock();
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~asCThreadReadWriteLock();
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void AcquireExclusive();
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void ReleaseExclusive();
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bool TryAcquireExclusive();
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void AcquireShared();
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void ReleaseShared();
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bool TryAcquireShared();
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protected:
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pthread_rwlock_t lock;
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};
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#elif defined(AS_WINDOWS_THREADS)
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END_AS_NAMESPACE
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#ifdef AS_XBOX360
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#include <xtl.h>
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#else
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#ifndef WIN32_LEAN_AND_MEAN
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#define WIN32_LEAN_AND_MEAN
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#endif
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#ifndef _WIN32_WINNT
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#define _WIN32_WINNT 0x0600 // We need this to get the declaration for Windows Phone compatible Ex functions
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#endif
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#include <windows.h>
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#endif
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BEGIN_AS_NAMESPACE
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// Undefine macros that cause problems in our code
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#undef GetObject
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#undef RegisterClass
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class asCThreadCriticalSection
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{
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public:
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asCThreadCriticalSection();
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~asCThreadCriticalSection();
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void Enter();
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void Leave();
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bool TryEnter();
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protected:
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CRITICAL_SECTION cs;
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};
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class asCThreadReadWriteLock
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{
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public:
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asCThreadReadWriteLock();
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~asCThreadReadWriteLock();
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void AcquireExclusive();
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void ReleaseExclusive();
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void AcquireShared();
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void ReleaseShared();
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protected:
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// The Slim Read Write Lock object, SRWLOCK, is more efficient
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// but it is only available from Windows Vista so we cannot use it and
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// maintain compatibility with olders versions of Windows.
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// Critical sections and semaphores are available on Windows XP and onwards.
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// Windows XP is oldest version we support with multithreading.
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// The implementation is based on the following article, that shows
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// how to implement a fair read/write lock that doesn't risk starving
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// the writers:
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// http://doc.qt.nokia.com/qq/qq11-mutex.html
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// TODO: Allow use of SRWLOCK through configuration in as_config.h
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CRITICAL_SECTION writeLock;
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HANDLE readLocks;
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};
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// This constant really should be a member of asCThreadReadWriteLock,
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// but it gives a compiler error on MSVC6 so I'm leaving it outside
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static const asUINT maxReaders = 10;
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#endif
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#endif
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END_AS_NAMESPACE
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#endif
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