зеркало из https://github.com/mozilla/gecko-dev.git
136 строки
3.7 KiB
C++
136 строки
3.7 KiB
C++
/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1 (the
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* "License"); you may not use this file except in compliance with the License. You may obtain
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* a copy of the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis, WITHOUT
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* WARRANTY OF ANY KIND, either express or implied. See the License for the specific
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* language governing rights and limitations under the License.
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*
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* The Original Code is [Open Source Virtual Machine.]
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*
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* The Initial Developer of the Original Code is Adobe System Incorporated. Portions created
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* by the Initial Developer are Copyright (C)[ 2004-2006 ] Adobe Systems Incorporated. All Rights
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* Reserved.
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*
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* Contributor(s): Adobe AS3 Team
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*
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* Alternatively, the contents of this file may be used under the terms of either the GNU
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* General Public License Version 2 or later (the "GPL"), or the GNU Lesser General Public
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* License Version 2.1 or later (the "LGPL"), in which case the provisions of the GPL or the
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* LGPL are applicable instead of those above. If you wish to allow use of your version of this
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* file only under the terms of either the GPL or the LGPL, and not to allow others to use your
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* version of this file under the terms of the MPL, indicate your decision by deleting provisions
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* above and replace them with the notice and other provisions required by the GPL or the
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* LGPL. If you do not delete the provisions above, a recipient may use your version of this file
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* under the terms of any one of the MPL, the GPL or the LGPL.
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*
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***** END LICENSE BLOCK ***** */
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#ifndef __GCSpinLock__
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#define __GCSpinLock__
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#ifdef __GNUC__
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#include <CoreServices/CoreServices.h>
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#else // __GNUC__
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#include <Multiprocessing.h>
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#endif // __GNUC__
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#if TARGET_RT_MAC_MACHO
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extern "C"
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{
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extern void _spin_lock(uint32_t *);
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extern void _spin_unlock(uint32_t *);
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}
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#endif
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namespace MMgc
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{
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/**
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* GCSpinLock is a simple spin lock class used by GCHeap to
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* ensure mutually exclusive access. The GCHeap may be accessed
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* by multiple threads, so this is necessary to ensure that
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* the threads do not step on each other.
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*/
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class GCSpinLock
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{
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public:
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GCSpinLock()
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{
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#if TARGET_RT_MAC_MACHO
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m1 = 0;
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#else
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OSStatus critErr = ::MPCreateCriticalRegion( &mCriticalRegion );
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GCAssert( critErr == noErr );
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#endif
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}
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~GCSpinLock()
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{
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#if !TARGET_RT_MAC_MACHO
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OSStatus critErr = ::MPDeleteCriticalRegion( mCriticalRegion );
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GCAssert( critErr == noErr );
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#endif
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}
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inline void Acquire()
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{
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#if TARGET_RT_MAC_MACHO
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_spin_lock(&m1);
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#else
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OSStatus critErr = ::MPEnterCriticalRegion( mCriticalRegion, kDurationForever );
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GCAssert( critErr == noErr );
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#endif
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}
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inline void Release()
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{
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#if TARGET_RT_MAC_MACHO
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_spin_unlock(&m1);
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#else
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OSStatus critErr = ::MPExitCriticalRegion( mCriticalRegion );
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GCAssert( critErr == noErr );
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#endif
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}
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private:
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#if TARGET_RT_MAC_MACHO
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uint32_t m1;
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#else
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MPCriticalRegionID mCriticalRegion;
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#endif
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};
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/**
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* GCAcquireSpinlock is a convenience class which acquires
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* the specified spinlock at construct time, then releases
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* the spinlock at desruct time. The single statement
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*
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* GCAcquireSpinlock acquire(spinlock);
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*
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* ... will acquire the spinlock at the top of the function
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* and release it at the end. This makes for less error-prone
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* code than explicit acquire/release.
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*/
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class GCAcquireSpinlock
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{
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public:
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GCAcquireSpinlock(GCSpinLock& spinlock) : m_spinlock(spinlock)
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{
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m_spinlock.Acquire();
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}
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~GCAcquireSpinlock()
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{
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m_spinlock.Release();
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}
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private:
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GCSpinLock& m_spinlock;
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};
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}
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#endif /* __GCSpinLock__ */
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