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/**
* 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,
* 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 "../pch.h"
#include "../util/net/message.h"
#include "mongomutex.h"
#include "pdfile.h"
#include "curop.h"
#include "client.h"
#include "databaseholder.h"
namespace mongo {
// todo: relocked is being called when there was no unlock below.
// that is weird.
struct dbtemprelease {
Client::Context * _context;
scoped_ptr<Lock::TempRelease> tr;
dbtemprelease() {
const Client& c = cc();
_context = c.getContext();
verify( Lock::isLocked() );
if( Lock::nested() ) {
Lock::nested();
massert(10298 , "can't temprelease nested lock", false);
}
if ( _context ) {
_context->unlocked();
}
tr.reset(new Lock::TempRelease);
verify( c.curop() );
c.curop()->yielded();
}
~dbtemprelease() {
tr.reset();
if ( _context )
_context->relocked();
}
};
/** must be write locked
no verify(and no release) if nested write lock
a lot like dbtempreleasecond, eliminate?
*/
struct dbtempreleasewritelock {
Client::Context * _context;
int _locktype;
scoped_ptr<Lock::TempRelease> tr;
dbtempreleasewritelock() {
const Client& c = cc();
_context = c.getContext();
verify( Lock::isW() );
if( Lock::nested() )
return;
if ( _context )
_context->unlocked();
tr.reset(new Lock::TempRelease);
verify( c.curop() );
c.curop()->yielded();
}
~dbtempreleasewritelock() {
tr.reset();
if ( _context )
_context->relocked();
}
};
/**
only does a temp release if we're not nested and have a lock
*/
class dbtempreleasecond : boost::noncopyable {
dbtemprelease * real;
public:
dbtempreleasecond() {
real = 0;
if( Lock::isLocked() ) {
// if nested don't temprelease, and we don't complain either for this class
if( !Lock::nested() ) {
real = new dbtemprelease();
}
}
}
~dbtempreleasecond() {
if ( real ) {
delete real;
real = 0;
}
}
bool unlocked() const { return real != 0; }
};
} // namespace mongo
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