mongodb/db/lasterror.h

// lasterror.h

/**
*    Copyright (C) 2009 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 <boost/thread/tss.hpp>

namespace mongo {

struct LastError {
    string msg;
    int nPrev;
    void raiseError(const char *_msg) { 
        msg = _msg;
        nPrev = 1;
    }
    bool haveError() const { return !msg.empty(); }
    void resetError() { msg.clear(); }
    LastError() { nPrev = 0; }
};

extern boost::thread_specific_ptr<LastError> lastError;

inline void raiseError(const char *msg) {
    LastError *le = lastError.get();
    if( le == 0 ) { 
        DEV log() << "warning: lastError==0 can't report:" << msg << '\n';
        return;
    }
    le->raiseError(msg);
}

} // namespace mongo