OSCondVarOld::~OSCondVarOld()
{
Scoped_Lock_Protect(internal_lock_);
run_state_ = SHUTDOWN;
if (recycling_list_size_ != allocation_counter_)
{
Scoped_Unlock_Protect(internal_lock_);
SignalAll();
Sleep(10);
}
}
void WaitableEvent::Signal()
{
nbase::NAutoLock locked(&kernel_->lock_);
if (kernel_->signaled_)
return;
if (kernel_->manual_reset_)
{
SignalAll();
kernel_->signaled_ = true;
}
else
{
// In the case of auto reset, if no waiters were woken, we remain
// signaled.
if (!SignalOne())
kernel_->signaled_ = true;
}
}
// Async Read callback
// TODO: Should we add a 'hint' here to let the reader know that we are waiting for
// a certain number of additional bytes? (to prevent unecessary loops)...
void CDSISession::OnReceive(CTCPPacketReader& reader)
{
DSIHeader hdr;
// Technically, we should probably be locking more in here, but we know that there is only one read thread, so
// there will never be concurrent calls into this method...
// Ongoing Reply...
/////////////////////////////////////////////////////
// TODO: Should we time out after some period...?
if (m_pOngoingReply) // Do we have a previously-incomplete reply block?
{
int err = kNoError;
// Continue working on the incomplete read...
int bytesRead = m_pOngoingReply->AppendResponse(reader);
if (bytesRead > 0) // All OK
{
if (m_pOngoingReply->GetBytesRemaining()) // Not quite done yet...
return; // Wait some more
}
else if(!bytesRead)
{
XAFP_LOG(XAFP_LOG_FLAG_ERROR, "DSI Protocol: TCPPacketReader returned zero bytes (expected: %d)", reader.GetBytesLeft());
}
else
{
XAFP_LOG(XAFP_LOG_FLAG_ERROR, "DSI Protocol: Unable to read response - Error: %d", bytesRead);
err = kTCPReceiveError;
}
// We either completed the reply block, or an error occurred. Signal waiting caller
XAFP_LOG(XAFP_LOG_FLAG_DSI_PROTO, "DSI Protocol: Finished receiving multi-PDU read response (expected: %d, read: %d, pieces: %d)",m_pOngoingReply->GetTotalBytes(), m_pOngoingReply->GetTotalBytes() - m_pOngoingReply->GetBytesRemaining(), m_pOngoingReply->GetPieces());
m_pOngoingReply->Complete(err);
m_pOngoingReply = NULL;
return;
}
// 'Standard' Message Block(s) or beginning of a multi-PDU reply
/////////////////////////////////////////////////////
while (reader.GetBytesLeft())
{
// Read the message header
int err = reader.Read(&hdr, sizeof(DSIHeader));
if (err < 0)
{
XAFP_LOG(XAFP_LOG_FLAG_ERROR, "DSI Protocol: Unable to read response header - Error: %d", err);
// TODO: Nothing after this is going to work...figure that out
return;
}
translate_header(hdr); // Change from network to host representation
if (!hdr.flags) // This is a server-initiated request (as opposed to a reply to one of our requests)
{
switch (hdr.command)
{
case DSITickle: // Used by server for 'heartbeat' monitoring
// TODO: Track time since last notice to detect timeouts
XAFP_LOG_0(XAFP_LOG_FLAG_DSI_PROTO, "DSI Protocol: Received Server 'Tickle'. Sending reply...");
SendMessage(DSITickle, GetNewRequestId()); // Send keep-alive reply to server
break;
case DSIAttention: // Used by server to notify clients of events
uint16_t attData;
// TODO: Implement reconnect handler and heed delay specified by server in AFPUserBytes
// TODO: Skip unexpected bytes, if present
// TODO: Retrieve quantum size during login
if (hdr.totalDataLength > 2)
XAFP_LOG(XAFP_LOG_FLAG_ERROR,"DSI Protocol: ****Unexpected Size for Attention Data**** (%d bytes)", hdr.totalDataLength);
reader.Read(&attData, sizeof(uint16_t)); // TODO: Where should we handle read() failures
attData = ntohs(attData); // Handle byte-ordering
XAFP_LOG(XAFP_LOG_FLAG_INFO, "DSI Protocol: Received Server Attention. Flags - Shutdown:%s, ServerCrash:%s, Message:%s, NoReconnect:%s",
(kShutDownNotifyMask & attData) ? "yes" : "no",
(kAllowReconnectMask & attData) ? "yes" : "no",
(kMsgNotifyMask & attData) ? "yes" : "no",
(kDisconnectNotifyMask & attData) ? "yes" : "no"
);
// TODO: Retrieve the server message when there is one
OnAttention(attData);
break;
case DSICloseSession: // Notification from server that the session will be closed.
// Signal all waiting callers and tell them something happened
XAFP_LOG_0(XAFP_LOG_FLAG_INFO, "DSI Protocol: Server Closed Session. Canceling all pending requests");
SignalAll(kDSISessionClosed);
// TODO: Clean-up session (and possibly re-open?)
break;
default:
XAFP_LOG(XAFP_LOG_FLAG_ERROR,"DSI Protocol: Received unknown request - command: %d", hdr.command);
}
}
else // This is a reply to a previously-sent message
{
CDSIRequest* pRequest = NULL;
switch (hdr.command)
{
case DSICloseSession: // This should not happen, but handle it anyway...
XAFP_LOG_0(XAFP_LOG_FLAG_ERROR, "DSI Protocol: Unexpected reply message - CloseSession");
// Signal all waiting callers and tell them something happened
SignalAll(kDSISessionClosed);
// TODO: Clean-up session (should already be done...)
break;
case DSIOpenSession:
case DSICommand:
case DSIWrite:
case DSIGetStatus:
XAFP_LOG(XAFP_LOG_FLAG_DSI_PROTO, "DSI Protocol: Received Reply - Message:%s, RequestId:%d, result:%d", DSIProtoCommandToString(hdr.command), hdr.requestID, hdr.errorCode);
// Find the request in our request map
pRequest = RemoveRequest(hdr.requestID);
if (pRequest)
{
// Tranfer data into caller-supplied buffer, if one was provided
// If not, they did not expect any data back, just a result code
// TODO: Make sure all data in the message is read/skipped before moving on, to prevent
// clogging-up the pipe...
pRequest->SaveResponse(reader, hdr.totalDataLength);
if (pRequest->IsOngoing())
{
m_pOngoingReply = pRequest;
return; // Wait for more data before signaling requestor...
}
// Signal waiting requestor
// NOTE: This object may self-destruct (or go out of scope) immediately. Do not use the reference again after calling 'Complete'
pRequest->Complete(hdr.errorCode);
}
else
{
XAFP_LOG(XAFP_LOG_FLAG_ERROR, "DSI Protocol: Unexpected reply - RequestId: %d", hdr.requestID);
// TODO: Need a better flush/skip/seek method
void* p = malloc(hdr.totalDataLength);
reader.Read(p, hdr.totalDataLength);
free(p);
}
break;
default:
// TODO: Skip payload data and try to recover
XAFP_LOG(XAFP_LOG_FLAG_ERROR, "DSI Protocol: Received unknown reply - command: %d, payload: %d", hdr.command, hdr.totalDataLength);
}
}
}
}
