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124 lines
3.3 KiB
C++
124 lines
3.3 KiB
C++
/*
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AngelCode Scripting Library
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Copyright (c) 2003-2009 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_gc.cpp
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//
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// The implementation of the garbage collector
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//
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#include "as_atomic.h"
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BEGIN_AS_NAMESPACE
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asCAtomic::asCAtomic() { value = 0; }
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asDWORD asCAtomic::get() const { return value; }
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void asCAtomic::set(asDWORD val) { value = val; }
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//
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// The following code implements the atomicInc and atomicDec on different platforms
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//
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#ifdef AS_NO_THREADS
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asDWORD asCAtomic::atomicInc() { return ++value; }
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asDWORD asCAtomic::atomicDec() { return --value; }
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#elif defined(AS_NO_ATOMIC)
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asDWORD asCAtomic::atomicInc() {
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asDWORD v;
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ENTERCRITICALSECTION(cs);
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v = ++value;
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LEAVECRITICALSECTION(cs);
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return v;
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}
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asDWORD asCAtomic::atomicDec() {
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asDWORD v;
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ENTERCRITICALSECTION(cs);
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v = --value;
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LEAVECRITICALSECTION(cs);
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return v;
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}
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#elif defined(AS_WIN)
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END_AS_NAMESPACE
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#define WIN32_MEAN_AND_LEAN
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#include <windows.h>
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BEGIN_AS_NAMESPACE
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asDWORD asCAtomic::atomicInc() { return InterlockedIncrement((LONG *)&value); }
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asDWORD asCAtomic::atomicDec() {
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asASSERT(value > 0);
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return InterlockedDecrement((LONG *)&value);
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}
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#elif defined(AS_LINUX) || defined(AS_BSD)
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//
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// atomic_inc_and_test() and atomic_dec_and_test() from asm/atomic.h is not meant
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// to be used outside the Linux kernel. Instead we should use the GNUC provided
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// __sync_add_and_fetch() and __sync_sub_and_fetch() functions.
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//
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// Reference: http://golubenco.org/blog/atomic-operations/
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//
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// These are only available in GCC 4.1 and above, so for older versions we
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// use the critical sections, though it is a lot slower.
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//
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asDWORD asCAtomic::atomicInc() { return __sync_add_and_fetch(&value, 1); }
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asDWORD asCAtomic::atomicDec() { return __sync_sub_and_fetch(&value, 1); }
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#elif defined(AS_MAC)
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END_AS_NAMESPACE
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#include <libkern/OSAtomic.h>
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BEGIN_AS_NAMESPACE
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asDWORD asCAtomic::atomicInc() { return OSAtomicIncrement32((int32_t *)&value); }
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asDWORD asCAtomic::atomicDec() { return OSAtomicDecrement32((int32_t *)&value); }
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#else
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// If we get here, then the configuration in as_config.h
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// is wrong for the compiler/platform combination.
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int ERROR_PleaseFixTheConfig[-1];
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#endif
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END_AS_NAMESPACE
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