Hi Guys, 

I'm working on a client/server application on windows 7, where both the client and the server have a multithreaded architecture, more precisely, three threads per application, the first for receiving messages, the 2nd for analysing them and processing and the 3rd for sending answers. when I implemented this architecture, sometimes I have deadlocks, I don't know why? the code of the two threads that uses MPI is below, I think the problem is the the blocking callls, So, is there any alternatives? what I tried to do is make the whole connection session uninterruptible but i couldn't find a way to do it.

Receiver thread:
forever
{
// wait up for a new message

emit WriteLine("waiting for connections on <" + QString::fromStdString(myPort) + ">\n");
MPI_Comm_accept( myPort, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &client);
MPI_Recv(&message, 1, MessageType, MPI_ANY_SOURCE, MPI_ANY_TAG, client, &status);

DIH.InFifo.Insert(message);    //insert the message into the fifo
emit WriteLine("A messaage "+QString::number(message.Command, 10)+" has been received from <"+QString::fromStdString(message.portSource)+">\n");

//disconnect from the current client
MPI_Barrier(client);
MPI_Comm_disconnect(&client);
}

Sender Thread:
forever 
{
message = DIH.OutFifo.Mov(); // to remove the message from the Fifo

// send a new message
emit WriteLine("trying to connect to <" + QString::fromStdString(message.portDest) + ">\n");
MPI_Comm_connect(message.portDest, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &client);

MPI_Send(&message, 1, MessageType, 0, 0, client);
emit WriteLine("A messaage "+QString::number(message.Command, 10)+" has been sent to <"+QString::fromStdString(message.portDest)+">\n");

//disconnect from the current client
MPI_Barrier(client);
MPI_Comm_disconnect(&client);
}