35 lines
768 B
C++
35 lines
768 B
C++
// Copyright (c) 2015-2016 The Bitcoin Core developers
|
|
// Distributed under the MIT software license, see the accompanying
|
|
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
|
|
|
|
#ifndef BITCOIN_REVERSELOCK_H
|
|
#define BITCOIN_REVERSELOCK_H
|
|
|
|
/**
|
|
* An RAII-style reverse lock. Unlocks on construction and locks on destruction.
|
|
*/
|
|
template<typename Lock>
|
|
class reverse_lock
|
|
{
|
|
public:
|
|
|
|
explicit reverse_lock(Lock& _lock) : lock(_lock) {
|
|
_lock.unlock();
|
|
_lock.swap(templock);
|
|
}
|
|
|
|
~reverse_lock() {
|
|
templock.lock();
|
|
templock.swap(lock);
|
|
}
|
|
|
|
private:
|
|
reverse_lock(reverse_lock const&);
|
|
reverse_lock& operator=(reverse_lock const&);
|
|
|
|
Lock& lock;
|
|
Lock templock;
|
|
};
|
|
|
|
#endif // BITCOIN_REVERSELOCK_H
|