c45b77186b
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@12771 a95241bf-73f2-0310-859d-f6bbb57e9c96
106 lines
2.8 KiB
C++
106 lines
2.8 KiB
C++
/*
|
|
Open Tracker License
|
|
|
|
Terms and Conditions
|
|
|
|
Copyright (c) 1991-2000, Be Incorporated. All rights reserved.
|
|
|
|
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 applies to all licensees
|
|
and 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 TITLE, MERCHANTABILITY,
|
|
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
BE INCORPORATED 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.
|
|
|
|
Except as contained in this notice, the name of Be Incorporated shall not be
|
|
used in advertising or otherwise to promote the sale, use or other dealings in
|
|
this Software without prior written authorization from Be Incorporated.
|
|
|
|
Tracker(TM), Be(R), BeOS(R), and BeIA(TM) are trademarks or registered trademarks
|
|
of Be Incorporated in the United States and other countries. Other brand product
|
|
names are registered trademarks or trademarks of their respective holders.
|
|
All rights reserved.
|
|
*/
|
|
|
|
#ifndef _AUTO_LOCK_H
|
|
#define _AUTO_LOCK_H
|
|
|
|
template<class T>
|
|
class AutoLock
|
|
{
|
|
|
|
// exception safe locking mechanism, allocate on stack and have
|
|
// destructor unlock for you whenever the lock goes out of scope
|
|
|
|
public:
|
|
AutoLock(T *lock, bool lockNow = true)
|
|
// use <lockLater> for lazy locking
|
|
: fLock(lock),
|
|
fHasLock(false)
|
|
{
|
|
if (lockNow)
|
|
fHasLock = fLock->Lock();
|
|
}
|
|
|
|
AutoLock(T &lock, bool lockNow = true)
|
|
: fLock(&lock),
|
|
fHasLock(false)
|
|
{
|
|
if (lockNow)
|
|
fHasLock = fLock->Lock();
|
|
}
|
|
|
|
~AutoLock()
|
|
{
|
|
if (fHasLock)
|
|
fLock->Unlock();
|
|
}
|
|
|
|
bool operator!() const
|
|
{ return !fHasLock; }
|
|
|
|
bool IsLocked() const
|
|
{ return fHasLock; }
|
|
|
|
// explicit Lock/Unlock calls are only used in special cases
|
|
// for unlocking before lock goes out of scope and successive
|
|
// re-locking
|
|
// usually constructor/destructor locks/unlocks are sufficient
|
|
void Unlock()
|
|
{
|
|
if (fHasLock) {
|
|
fLock->Unlock();
|
|
fHasLock = false;
|
|
}
|
|
}
|
|
|
|
bool Lock()
|
|
{
|
|
if (!fHasLock)
|
|
fHasLock = fLock->Lock();
|
|
|
|
return fHasLock;
|
|
}
|
|
|
|
// convenience call used when passing the AutoLock and the locked object
|
|
// around
|
|
T *LockedItem() const
|
|
{ return fLock; }
|
|
|
|
private:
|
|
T *fLock;
|
|
bool fHasLock;
|
|
};
|
|
|
|
#endif
|