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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 "concurrency.h"
#include "pdfile.h"
#include "curop.h"
#include "client.h"
#include "databaseholder.h"
namespace mongo {
struct dbtemprelease {
Client::Context * _context;
int _locktype;
dbtemprelease() {
const Client& c = cc();
_context = c.getContext();
_locktype = d.dbMutex.getState();
assert( _locktype );
if ( _locktype > 0 ) {
massert( 10298 , "can't temprelease nested write lock", _locktype == 1);
if ( _context ) _context->unlocked();
d.dbMutex.unlock();
}
else {
massert( 10299 , "can't temprelease nested read lock", _locktype == -1);
if ( _context ) _context->unlocked();
d.dbMutex.unlock_shared();
}
verify( 14814 , c.curop() );
c.curop()->yielded();
}
~dbtemprelease() {
if ( _locktype > 0 )
d.dbMutex.lock();
else
d.dbMutex.lock_shared();
if ( _context ) _context->relocked();
}
};
/** must be write locked
no assert (and no release) if nested write lock
a lot like dbtempreleasecond but no malloc so should be a tiny bit faster
*/
struct dbtempreleasewritelock {
Client::Context * _context;
int _locktype;
dbtempreleasewritelock() {
const Client& c = cc();
_context = c.getContext();
_locktype = d.dbMutex.getState();
assert( _locktype >= 1 );
if( _locktype > 1 )
return; // nested
if ( _context )
_context->unlocked();
d.dbMutex.unlock();
verify( 14845 , c.curop() );
c.curop()->yielded();
}
~dbtempreleasewritelock() {
if ( _locktype == 1 )
d.dbMutex.lock();
if ( _context )
_context->relocked();
}
};
/**
only does a temp release if we're not nested and have a lock
*/
struct dbtempreleasecond {
dbtemprelease * real;
int locktype;
dbtempreleasecond() {
real = 0;
locktype = d.dbMutex.getState();
if ( locktype == 1 || locktype == -1 )
real = new dbtemprelease();
}
~dbtempreleasecond() {
if ( real ) {
delete real;
real = 0;
}
}
bool unlocked() {
return real != 0;
}
};
} // namespace mongo
#include "concurrency.h"
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