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when creating a DB for the first time, and only need a read lock, make sure to give up the write lock

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This commit is contained in:
Eliot Horowitz 2010-02-12 14:07:17 -05:00
parent 2348a3cc12
commit eeae78fbf2
1 changed files with 19 additions and 5 deletions
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24
db/client.cpp
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@ -110,12 +110,26 @@ namespace mongo {
_justCreated = false;
}
else {
// we need to be in a write lock since we're going to create the DB object
if ( _lock )
_lock->releaseAndWriteLock();
assertInWriteLock();
for ( int x=0; x<2; x++ ){
{ // we need to be in a write lock since we're going to create the DB object
// to do that, we're going to unlock, then get a write lock
// this is so that if this is the first query and its long doesn't block db
// we just have to check that the db wasn't closed in the interim where we unlock
dbtemprelease unlock;
writelock lk( _ns );
dbHolder.getOrCreate( _ns , _path , _justCreated );
}
_db = dbHolder.get( _ns , _path );
if ( _db )
break;
log() << "db was closed on us right after we opened it: " << _ns << endl;
}
_db = dbHolder.getOrCreate( _ns , _path , _justCreated );
uassert( 13005 , "can't create db, keeps getting closed" , _db );
}
_client->_context = this;