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// background.cpp
/**
* Copyright (C) 2010 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/>.
*
* 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.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/background.h"
#include <iostream>
#include <string>
#include "mongo/base/disallow_copying.h"
#include "mongo/stdx/condition_variable.h"
#include "mongo/stdx/thread.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/map_util.h"
#include "mongo/util/mongoutils/str.h"
#include "mongo/util/string_map.h"
namespace mongo {
using std::shared_ptr;
namespace {
class BgInfo {
MONGO_DISALLOW_COPYING(BgInfo);
public:
BgInfo() : _opsInProgCount(0) {}
void recordBegin();
int recordEnd();
void awaitNoBgOps(stdx::unique_lock<stdx::mutex>& lk);
int getOpsInProgCount() const { return _opsInProgCount; }
private:
int _opsInProgCount;
stdx::condition_variable _noOpsInProg;
};
typedef StringMap<std::shared_ptr<BgInfo> > BgInfoMap;
typedef BgInfoMap::const_iterator BgInfoMapIterator;
stdx::mutex m;
BgInfoMap dbsInProg;
BgInfoMap nsInProg;
void BgInfo::recordBegin() {
++_opsInProgCount;
}
int BgInfo::recordEnd() {
dassert(_opsInProgCount > 0);
--_opsInProgCount;
if (0 == _opsInProgCount) {
_noOpsInProg.notify_all();
}
return _opsInProgCount;
}
void BgInfo::awaitNoBgOps(stdx::unique_lock<stdx::mutex>& lk) {
while (_opsInProgCount > 0)
_noOpsInProg.wait(lk);
}
void recordBeginAndInsert(BgInfoMap* bgiMap, StringData key) {
std::shared_ptr<BgInfo>& bgInfo = bgiMap->get(key);
if (!bgInfo)
bgInfo.reset(new BgInfo);
bgInfo->recordBegin();
}
void recordEndAndRemove(BgInfoMap* bgiMap, StringData key) {
BgInfoMapIterator iter = bgiMap->find(key);
fassert(17431, iter != bgiMap->end());
if (0 == iter->second->recordEnd()) {
bgiMap->erase(iter);
}
}
void awaitNoBgOps(
stdx::unique_lock<stdx::mutex>& lk,
BgInfoMap* bgiMap,
StringData key) {
std::shared_ptr<BgInfo> bgInfo = mapFindWithDefault(
*bgiMap, key, std::shared_ptr<BgInfo>());
if (!bgInfo)
return;
bgInfo->awaitNoBgOps(lk);
}
} // namespace
bool BackgroundOperation::inProgForDb(StringData db) {
stdx::lock_guard<stdx::mutex> lk(m);
return dbsInProg.find(db) != dbsInProg.end();
}
bool BackgroundOperation::inProgForNs(StringData ns) {
stdx::lock_guard<stdx::mutex> lk(m);
return nsInProg.find(ns) != nsInProg.end();
}
void BackgroundOperation::assertNoBgOpInProgForDb(StringData db) {
uassert(ErrorCodes::BackgroundOperationInProgressForDatabase, mongoutils::str::stream() <<
"cannot perform operation: a background operation is currently running for "
"database " << db,
!inProgForDb(db));
}
void BackgroundOperation::assertNoBgOpInProgForNs(StringData ns) {
uassert(ErrorCodes::BackgroundOperationInProgressForNamespace, mongoutils::str::stream() <<
"cannot perform operation: a background operation is currently running for "
"collection " << ns,
!inProgForNs(ns));
}
void BackgroundOperation::awaitNoBgOpInProgForDb(StringData db) {
stdx::unique_lock<stdx::mutex> lk(m);
awaitNoBgOps(lk, &dbsInProg, db);
}
void BackgroundOperation::awaitNoBgOpInProgForNs(StringData ns) {
stdx::unique_lock<stdx::mutex> lk(m);
awaitNoBgOps(lk, &nsInProg, ns);
}
BackgroundOperation::BackgroundOperation(StringData ns) : _ns(ns) {
stdx::lock_guard<stdx::mutex> lk(m);
recordBeginAndInsert(&dbsInProg, _ns.db());
recordBeginAndInsert(&nsInProg, _ns.ns());
}
BackgroundOperation::~BackgroundOperation() {
stdx::lock_guard<stdx::mutex> lk(m);
recordEndAndRemove(&dbsInProg, _ns.db());
recordEndAndRemove(&nsInProg, _ns.ns());
}
void BackgroundOperation::dump(std::ostream& ss) {
stdx::lock_guard<stdx::mutex> lk(m);
if( nsInProg.size() ) {
ss << "\n<b>Background Jobs in Progress</b>\n";
for( BgInfoMapIterator i = nsInProg.begin(); i != nsInProg.end(); ++i )
ss << " " << i->first << '\n';
}
for( BgInfoMapIterator i = dbsInProg.begin(); i != dbsInProg.end(); ++i ) {
if( i->second->getOpsInProgCount() )
ss << "database " << i->first << ": " << i->second->getOpsInProgCount() << '\n';
}
}
} // namespace mongo
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