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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 "../stdafx.h"
#include "../grid/message.h"
namespace mongo {
void jniCallback(Message& m, Message& out);
class MutexInfo {
unsigned long long start, enter, timeLocked; // all in microseconds
int locked;
public:
MutexInfo() : locked(0) {
start = curTimeMicros64();
}
void entered() {
enter = curTimeMicros64();
locked++;
assert( locked == 1 );
}
void leaving() {
locked--;
assert( locked == 0 );
timeLocked += curTimeMicros64() - enter;
}
int isLocked() const {
return locked;
}
void timingInfo(unsigned long long &s, unsigned long long &tl) {
s = start;
tl = timeLocked;
}
};
extern boost::mutex dbMutex;
extern MutexInfo dbMutexInfo;
//extern int dbLocked;
struct lock {
boostlock bl_;
MutexInfo& info_;
lock( boost::mutex &mutex, MutexInfo &info ) :
bl_( mutex ),
info_( info ) {
info_.entered();
}
~lock() {
info_.leaving();
}
};
struct dblock : public lock {
dblock() :
lock( dbMutex, dbMutexInfo ) {
}
};
} // namespace mongo
#include "boost/version.hpp"
namespace mongo {
/* a scoped release of a mutex temporarily -- like a scopedlock but reversed.
*/
struct temprelease {
boost::mutex& m;
temprelease(boost::mutex& _m) : m(_m) {
#if BOOST_VERSION >= 103500
m.unlock();
#else
boost::detail::thread::lock_ops<boost::mutex>::unlock(m);
#endif
}
~temprelease() {
#if BOOST_VERSION >= 103500
m.lock();
#else
boost::detail::thread::lock_ops<boost::mutex>::lock(m);
#endif
}
};
} // namespace mongo
#include "pdfile.h"
namespace mongo {
// tempish...move to TLS or pass all the way down as a parm
extern map<string,Database*> databases;
extern Database *database;
extern const char *curNs;
extern bool master;
inline string getKey( const char *ns, const char *path ) {
char cl[256];
nsToClient(ns, cl);
return string( cl ) + ":" + path;
}
/* returns true if the database ("database") did not exist, and it was created on this call */
inline bool setClient(const char *ns, const char *path=dbpath) {
/* we must be in critical section at this point as these are global
variables.
*/
assert( dbMutexInfo.isLocked() );
curNs = ns;
string key = getKey( ns, path );
map<string,Database*>::iterator it = databases.find(key);
if ( it != databases.end() ) {
database = it->second;
return false;
}
// when master for replication, we advertise all the db's, and that
// looks like a 'first operation'. so that breaks this log message's
// meaningfulness. instead of fixing (which would be better), we just
// stop showing for now.
// 2008-12-22 We now open every database on startup, so this log is
// no longer helpful. Commenting.
// if( !master )
// log() << "first operation for database " << key << endl;
char cl[256];
nsToClient(ns, cl);
bool justCreated;
Database *c = new Database(cl, justCreated, path);
databases[key] = c;
database = c;
database->finishInit();
return justCreated;
}
// shared functionality for removing references to a database from this program instance
// does not delete the files on disk
void closeClient( const char *cl, const char *path = dbpath );
inline void eraseDatabase( const char *ns, const char *path=dbpath ) {
string key = getKey( ns, path );
databases.erase( key );
}
/* We normally keep around a curNs ptr -- if this ns is temporary,
use this instead so we don't have a bad ptr. we could have made a copy,
but trying to be fast as we call setClient this for every single operation.
*/
inline bool setClientTempNs(const char *ns) {
bool jc = setClient(ns);
curNs = "";
return jc;
}
struct dbtemprelease {
string clientname;
string clientpath;
dbtemprelease() {
if ( database ) {
clientname = database->name;
clientpath = database->path;
}
dbMutexInfo.leaving();
#if BOOST_VERSION >= 103500
dbMutex.unlock();
#else
boost::detail::thread::lock_ops<boost::mutex>::unlock(dbMutex);
#endif
}
~dbtemprelease() {
#if BOOST_VERSION >= 103500
dbMutex.lock();
#else
boost::detail::thread::lock_ops<boost::mutex>::lock(dbMutex);
#endif
dbMutexInfo.entered();
if ( clientname.empty() )
database = 0;
else
setClient(clientname.c_str(), clientpath.c_str());
}
};
} // namespace mongo
#include "dbinfo.h"
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