Combined Send/Receive
•Suppose task 0 sends data to task 1 and at the same time receives data from task 2.This can be achieved through a combined send/receive call.
•Technically this sends a message and posts a receive before blocking.
•It will block till the sending application buffer is free for reuse and the receiving application buffer contains the sent message.
•MPI_SENDRECV (sendbuf, sendcount, sendtype, dest, sendtag, recvbuf, recvcount, recvtype, source, recvtag, comm, status,ierr)