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// lockstate.cpp
/**
* 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/>.
*/
#include "pch.h"
#include "mongo/db/d_concurrency.h"
#include "mongo/db/namespacestring.h"
#include "mongo/db/client.h"
#include "mongo/util/mongoutils/str.h"
#include "lockstate.h"
namespace mongo {
LockState::LockState()
: _recursive(0),
_threadState(0),
_whichNestable( Lock::notnestable ),
_nestableCount(0),
_otherCount(0),
_otherLock(NULL),
_scopedLk(NULL)
{
}
bool LockState::isRW() const {
return _threadState == 'R' || _threadState == 'W';
}
bool LockState::isW() const {
return _threadState == 'W';
}
bool LockState::hasAnyReadLock() const {
return _threadState == 'r' || _threadState == 'R';
}
bool LockState::isLocked( const StringData& ns ) {
char db[MaxDatabaseNameLen];
nsToDatabase(ns.data(), db);
DEV verify( _otherName.find( '.' ) == string::npos ); // XXX this shouldn't be here, but somewhere
if ( _otherCount && db == _otherName )
return true;
if ( _nestableCount ) {
if ( mongoutils::str::equals( db , "local" ) )
return _whichNestable == Lock::local;
if ( mongoutils::str::equals( db , "admin" ) )
return _whichNestable == Lock::admin;
}
return false;
}
void LockState::locked( char newState ) {
_threadState = newState;
}
void LockState::unlocked() {
_threadState = 0;
}
void LockState::changeLockState( char newState ) {
fassert( 16169 , _threadState != 0 );
_threadState = newState;
}
static string kind(int n) {
if( n > 0 )
return "W";
if( n < 0 )
return "R";
return "?";
}
/** Note: this is is called by the currentOp command, which is a different
thread. So be careful about thread safety here. For example reading
this->otherName would not be safe as-is!
*/
void LockState::reportState(BSONObjBuilder& res) {
BSONObjBuilder b;
if( _threadState ) {
char buf[2];
buf[0] = _threadState;
buf[1] = 0;
b.append(".", buf);
}
if( _nestableCount ) {
string s = "?";
if( _whichNestable == Lock::local )
s = ".local";
else if( _whichNestable == Lock::admin )
s = ".admin";
b.append(s, kind(_nestableCount));
}
if( _otherCount ) {
WrapperForRWLock *k = _otherLock;
if( k ) {
string s = ".";
s += k->name();
b.append(s, kind(_otherCount));
}
}
BSONObj o = b.obj();
if( !o.isEmpty() )
res.append("locks", o);
}
void LockState::Dump() {
cc().lockState().dump();
}
void LockState::dump() {
char s = _threadState;
stringstream ss;
ss << "lock status: ";
if( s == 0 ){
ss << "unlocked";
}
else {
ss << s;
if( _recursive ) {
ss << " recursive:" << _recursive;
}
ss << " otherCount:" << _otherCount;
if( _otherCount ) {
ss << " otherdb:" << _otherName;
}
if( _nestableCount ) {
ss << " nestableCount:" << _nestableCount << " which:";
if( _whichNestable == Lock::local )
ss << "local";
else if( _whichNestable == Lock::admin )
ss << "admin";
else
ss << (int)_whichNestable;
}
}
log() << ss.str() << endl;
}
void LockState::enterScopedLock( Lock::ScopedLock* lock ) {
_recursive++;
if ( _recursive == 1 ) {
fassert(16115, _scopedLk == 0);
_scopedLk = lock;
}
}
Lock::ScopedLock* LockState::leaveScopedLock() {
_recursive--;
dassert( _recursive < 10000 );
Lock::ScopedLock* temp = _scopedLk;
if ( _recursive > 0 ) {
return NULL;
}
_scopedLk = NULL;
return temp;
}
void LockState::lockedNestable( Lock::Nestable what , int type) {
verify( type );
_whichNestable = what;
_nestableCount += type;
}
void LockState::unlockedNestable() {
_whichNestable = Lock::notnestable;
_nestableCount = 0;
}
void LockState::lockedOther( const string& other , int type , WrapperForRWLock* lock ) {
fassert( 16170 , _otherCount == 0 );
_otherName = other;
_otherCount = type;
_otherLock = lock;
}
void LockState::unlockedOther() {
_otherName = "";
_otherCount = 0;
_otherLock = 0;
}
}
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