/** locking in read lock when called */
static void _go(AlignedBuilder& bb) {
if( wi._writes.empty() )
return;
PREPLOGBUFFER(bb);
// todo: add double buffering so we can be (not even read locked) during WRITETOJOURNAL
WRITETOJOURNAL(bb);
// write the noted write intent entries to the data files
WRITETODATAFILES();
wi.clear();
REMAPPRIVATEVIEW();
}
/** locking in read lock when called
@see MongoMMF::close()
*/
static void groupCommit() {
dbMutex.assertAtLeastReadLocked();
if( !commitJob.hasWritten() )
return;
PREPLOGBUFFER();
WRITETOJOURNAL(commitJob._ab);
// data is now in the journal, which is sufficient for acknowledging getlasterror.
// (ok to crash after that)
log() << "TEMP NOTIFYING COMMITTED" << endl;
commitJob.notifyCommitted();
// write the noted write intent entries to the data files.
// this has to come after writing to the journal, obviously...
MongoFile::markAllWritable(); // for _DEBUG. normally we don't write in a read lock
WRITETODATAFILES();
if (!dbMutex.isWriteLocked())
MongoFile::unmarkAllWritable();
commitJob.reset();
// REMAPPRIVATEVIEW
//
// remapping private views must occur after WRITETODATAFILES otherwise
// we wouldn't see newly written data on reads.
//
DEV assert( !commitJob.hasWritten() );
if( !dbMutex.isWriteLocked() ) {
// this needs done in a write lock thus we do it on the next acquisition of that
// instead of here (there is no rush if you aren't writing anyway -- but it must happen,
// if it is done, before any uncommitted writes occur).
//
dbMutex._remapPrivateViewRequested = true;
}
else {
// however, if we are already write locked, we must do it now -- up the call tree someone
// may do a write without a new lock acquisition. this can happen when MongoMMF::close() calls
// this method when a file (and its views) is about to go away.
//
REMAPPRIVATEVIEW();
}
}
static void remapPrivateView() {
try {
// REMAPPRIVATEVIEW
//
// remapping private views must occur after WRITETODATAFILES otherwise
// we wouldn't see newly written data on reads.
//
invariant(!commitJob.hasWritten());
stats.curr->_commitsInWriteLock++;
REMAPPRIVATEVIEW();
}
catch (DBException& e) {
log() << "dbexception in remapPrivateView causing immediate shutdown: "
<< e.toString()
<< endl;
mongoAbort("gc1");
}
catch (std::ios_base::failure& e) {
log() << "ios_base exception in remapPrivateView causing immediate shutdown: "
<< e.what()
<< endl;
mongoAbort("gc2");
}
catch (std::bad_alloc& e) {
log() << "bad_alloc exception in remapPrivateView causing immediate shutdown: "
<< e.what()
<< endl;
mongoAbort("gc3");
}
catch (std::exception& e) {
log() << "exception in remapPrivateView causing immediate shutdown: "
<< e.what()
<< endl;
mongoAbort("gc4");
}
LOG(4) << "remapPrivateView end" << endl;
}
