bool MessageEndpoint::RegisterCallback(Ticket &outTicket)
{
//Only one thread in this function at a time
Lock lock(&m_callbackRegisterMutex);
{
uint32_t nextSerial;
{
//Protection for the m_callbackDoWakeup bool
Lock condLock(&m_availableCBsMutex);
//TODO: Unprotected read of byte value m_isShutdown. Probably safe though.
while(m_availableCBs.empty() && !m_isShutDown)
{
pthread_cond_wait(&m_callbackWakeupCondition, &m_availableCBsMutex);
}
if(m_isShutDown)
{
return false;
}
//This is the first message of the protocol. This message contains the serial number we will be expecting later
nextSerial = m_availableCBs.front();
m_availableCBs.pop();
}
outTicket.m_isCallback = true;
outTicket.m_hasInit = true;
outTicket.m_ourSerialNum = nextSerial;
outTicket.m_socketFD = m_socketFD;
MessageQueue *queue = m_queues.GetByOurSerial(nextSerial);
if(queue == NULL)
{
outTicket.m_theirSerialNum = 0;
}
else
{
outTicket.m_theirSerialNum = queue->GetTheirSerialNum();
}
}
return true;
}
