/usr/include/mongo/base/counter.h is in mongodb-dev 1:2.4.9-1ubuntu2.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 | // counter.h
/**
* Copyright (C) 2008-2012 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include "mongo/platform/atomic_word.h"
#include "mongo/platform/cstdint.h"
namespace mongo {
/**
* A 64bit (atomic) counter.
*
* The constructor allows setting the start value, and increment([int]) is used to change it.
*
* The value can be returned using get() or the (long long) function operator.
*/
class Counter64 {
public:
/** Atomically increment. */
void increment( uint64_t n = 1 ) { _counter.addAndFetch(n); }
/** Atomically decrement. */
void decrement( uint64_t n = 1 ) { _counter.subtractAndFetch(n); }
/** Return the current value */
long long get() const { return _counter.load(); }
operator long long() const { return get(); }
private:
AtomicInt64 _counter;
};
}
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