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/* @file value.h
concurrency helpers DiagStr
*/
/**
* Copyright (C) 2008 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,b
* 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/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects
* for all of the code used other than as permitted herein. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you do not
* wish to do so, delete this exception statement from your version. If you
* delete this exception statement from all source files in the program,
* then also delete it in the license file.
*/
#pragma once
#include "spin_lock.h"
namespace mongo {
// todo: rename this to ThreadSafeString or something
/** there is now one mutex per DiagStr. If you have hundreds or millions of
DiagStrs you'll need to do something different.
*/
class DiagStr {
mutable SpinLock m;
std::string _s;
public:
DiagStr(const DiagStr& r) : _s(r.get()) {}
DiagStr(const std::string& r) : _s(r) {}
DiagStr() {}
bool empty() const {
scoped_spinlock lk(m);
return _s.empty();
}
std::string get() const {
scoped_spinlock lk(m);
return _s;
}
void set(const char* s) {
scoped_spinlock lk(m);
_s = s;
}
void set(const std::string& s) {
scoped_spinlock lk(m);
_s = s;
}
operator std::string() const {
return get();
}
void operator=(const std::string& s) {
set(s);
}
void operator=(const DiagStr& rhs) {
set(rhs.get());
}
// == is not defined. use get() == ... instead. done this way so one thinks about if composing
// multiple operations
bool operator==(const std::string& s) const;
};
}
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