Mailbox owner is a process that can send messages to a mailbox cause it has already Mailbox.

Process execution must be parallel

In indirect communication, each pair of processes may have several links (i.e. mailboxes)

In blocking (synchronous) send, the sending process is blocked until the message is received by the receiving process or by the mailbox.

A process that is waiting for the CPU is in ....... state

In non-blocking (asynchronous) send: The sending process sends the message and resumes operation,immediately.

Blocking (asynchronous) receive: The receiver retrieves either a valid message or a null and resumes operation, immediately.

➢ parent process may terminate its child using the .......... system call.

➢ A child process may output data to its parent using ............. system call.

A.............uses more of its time doing computations

One thread immediately terminates the target thread

• The link cannot have any messages waiting in ......................

Context switch time is pure overhead

in ................... the queue has finite length n; thus, at most n messages can reside in it

A ............. is an endpoint for communication