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/**
* Copyright (C) 2014 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.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kDefault
#include "mongo/db/global_timestamp.h"
#include "mongo/stdx/mutex.h"
#include "mongo/stdx/thread.h"
#include "mongo/util/log.h"
namespace {
mongo::stdx::mutex globalTimestampMutex;
mongo::Timestamp globalTimestamp(0, 0);
bool skewed(const mongo::Timestamp& val) {
if (val.getInc() & 0x80000000) {
mongo::warning() << "clock skew detected prev: " << val.getSecs()
<< " now: " << (unsigned) time(0) << std::endl;
return true;
}
return false;
}
}
namespace mongo {
void setGlobalTimestamp(const Timestamp& newTime) {
stdx::lock_guard<stdx::mutex> lk(globalTimestampMutex);
globalTimestamp = newTime;
}
Timestamp getLastSetTimestamp() {
stdx::lock_guard<stdx::mutex> lk(globalTimestampMutex);
return globalTimestamp;
}
Timestamp getNextGlobalTimestamp() {
stdx::lock_guard<stdx::mutex> lk(globalTimestampMutex);
const unsigned now = (unsigned) time(0);
const unsigned globalSecs = globalTimestamp.getSecs();
if ( globalSecs == now ) {
globalTimestamp = Timestamp(globalSecs, globalTimestamp.getInc() + 1);
}
else if ( now < globalSecs ) {
globalTimestamp = Timestamp(globalSecs, globalTimestamp.getInc() + 1);
// separate function to keep out of the hot code path
fassert(17449, !skewed(globalTimestamp));
}
else {
globalTimestamp = Timestamp(now, 1);
}
return globalTimestamp;
}
}
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