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/* Copyright 2017 MongoDB 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/>.
*
* 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 <boost/preprocessor/stringize.hpp>
#include "mongo/base/disallow_copying.h"
namespace mongo {
/**
* Marks a thread as idle while in scope. Prefer to use the macro below.
*
* Our debugger scripts can hide idle threads when dumping all stacks. You should mark threads as
* idle when printing the stack would just be unhelpful noise. IdleThreadBlocks are not allowed to
* nest. Each thread should generally have at most one possible place where it it is considered
* idle.
*/
class IdleThreadBlock {
MONGO_DISALLOW_COPYING(IdleThreadBlock);
public:
IdleThreadBlock(const char* location) {
beginIdleThreadBlock(location);
}
~IdleThreadBlock() {
endIdleThreadBlock();
}
// These should not be called by mongo C++ code. They are only public to allow exposing this
// functionality to a C api.
static void beginIdleThreadBlock(const char* location);
static void endIdleThreadBlock();
};
/**
* Marks a thread idle for the rest of the current scope and passes file:line as the location.
*/
#define MONGO_IDLE_THREAD_BLOCK IdleThreadBlock markIdle(__FILE__ ":" BOOST_PP_STRINGIZE(__LINE__))
} // namespace mongo
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