When does the condition 'rendezvous' arise?

Question

When the process issues an I/O request :
a) It is placed in an I/O queue
b) It is placed in a waiting queue
c) It is placed in the ready queue
d) It is placed in the Job queue

Answer 1

In message passing, it is the condition in which, both, the sender and receiver are blocked until the message is delivered.

In N-Buffer system when sender is sending the message to reciever and the buffer is full then at that situation
sender and receiver both r blocked untill receiver deliver the message and any buffer slot is free.