private void PoolCreateRequest(object state)
{
// called by pooler to ensure pool requests are currently being satisfied -
// creation mutex has not been obtained
if (State.Running == _state)
{
// in case WaitForPendingOpen ever failed with no subsequent OpenAsync calls,
// start it back up again
if (!_pendingOpens.IsEmpty && _pendingOpensWaiting == 0)
{
Thread waitOpenThread = new Thread(WaitForPendingOpen);
waitOpenThread.IsBackground = true;
waitOpenThread.Start();
}
// Before creating any new objects, reclaim any released objects that were
// not closed.
ReclaimEmancipatedObjects();
if (!ErrorOccurred)
{
if (NeedToReplenish)
{
// Check to see if pool was created using integrated security and if so, make
// sure the identity of current user matches that of user that created pool.
// If it doesn't match, do not create any objects on the ThreadPool thread,
// since either Open will fail or we will open a object for this pool that does
// not belong in this pool. The side effect of this is that if using integrated
// security min pool size cannot be guaranteed.
if (UsingIntegrateSecurity && !_identity.Equals(DbConnectionPoolIdentity.GetCurrent()))
{
return;
}
int waitResult = BOGUS_HANDLE;
try
{
try { }
finally
{
waitResult = WaitHandle.WaitAny(_waitHandles.GetHandles(withCreate: true), CreationTimeout);
}
if (CREATION_HANDLE == waitResult)
{
DbConnectionInternal newObj;
// Check ErrorOccurred again after obtaining mutex
if (!ErrorOccurred)
{
while (NeedToReplenish)
{
// Don't specify any user options because there is no outer connection associated with the new connection
newObj = CreateObject(owningObject: null, userOptions: null, oldConnection: null);
// We do not need to check error flag here, since we know if
// CreateObject returned null, we are in error case.
if (null != newObj)
{
PutNewObject(newObj);
}
else
{
break;
}
}
}
}
else if (WaitHandle.WaitTimeout == waitResult)
{
// do not wait forever and potential block this worker thread
// instead wait for a period of time and just requeue to try again
QueuePoolCreateRequest();
}
}
finally
{
if (CREATION_HANDLE == waitResult)
{
// reuse waitResult and ignore its value
_waitHandles.CreationSemaphore.Release(1);
}
}
}
}
}
}
