106 lines
2.8 KiB
C
106 lines
2.8 KiB
C
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/*
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Open Tracker License
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Terms and Conditions
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Copyright (c) 1991-2000, Be Incorporated. All rights reserved.
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Permission is hereby granted, free of charge, to any person obtaining a copy of
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this software and associated documentation files (the "Software"), to deal in
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the Software without restriction, including without limitation the rights to
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use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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of the Software, and to permit persons to whom the Software is furnished to do
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so, subject to the following conditions:
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The above copyright notice and this permission notice applies to all licensees
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and shall be included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF TITLE, MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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BE INCORPORATED BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF, OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of Be Incorporated shall not be
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used in advertising or otherwise to promote the sale, use or other dealings in
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this Software without prior written authorization from Be Incorporated.
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Tracker(TM), Be(R), BeOS(R), and BeIA(TM) are trademarks or registered trademarks
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of Be Incorporated in the United States and other countries. Other brand product
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names are registered trademarks or trademarks of their respective holders.
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All rights reserved.
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*/
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#ifndef _AUTO_LOCK_H
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#define _AUTO_LOCK_H
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template<class T>
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class AutoLock
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{
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// exception safe locking mechanism, allocate on stack and have
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// destructor unlock for you whenever the lock goes out of scope
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public:
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AutoLock(T *lock, bool lockNow = true)
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// use <lockLater> for lazy locking
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: fLock(lock),
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fHasLock(false)
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{
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if (lockNow)
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fHasLock = fLock->Lock();
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}
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AutoLock(T &lock, bool lockNow = true)
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: fLock(&lock),
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fHasLock(false)
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{
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if (lockNow)
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fHasLock = fLock->Lock();
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}
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~AutoLock()
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{
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if (fHasLock)
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fLock->Unlock();
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}
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bool operator!() const
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{ return !fHasLock; }
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bool IsLocked() const
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{ return fHasLock; }
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// explicit Lock/Unlock calls are only used in special cases
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// for unlocking before lock goes out of scope and successive
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// re-locking
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// usually constructor/destructor locks/unlocks are sufficient
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void Unlock()
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{
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if (fHasLock) {
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fLock->Unlock();
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fHasLock = false;
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}
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}
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bool Lock()
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{
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if (!fHasLock)
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fHasLock = fLock->Lock();
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return fHasLock;
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}
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// convenience call used when passing the AutoLock and the locked object
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// around
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T *LockedItem() const
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{ return fLock; }
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private:
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T *fLock;
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bool fHasLock;
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};
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#endif
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