[mpich-discuss] MPI and threaded communication

[Joseph Gonzalez]

Hi,

We are building a threaded, event driven C++ wrapper for MPICH2.  We  
would like to be able to simultaneously send and receive messages from  
multiple threads in the same process.  If two threads simultaneous try  
to send to two different rank destinations (on some remote machine)  
will they both transmit simultaneously or is their an internal mutex  
that will prohibit this from happening?

Thanks,
Joey