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Processes 2: Inter-process communication


In this lecture, we discuss inter-process communication in general, concentrating on two kinds: termination notification and stream communication.

Draft lecture notesTextbook readings

Inter-process communication

Metrics for communication

Termination notification question

Voluntary termination: Exit

Involuntary termination

Collecting a termination notification

Example: waitmyecho

What’s weird about Unix termination notification

Speed of exit notification

Streaming communication question

The pipe system call

pipe illustration

Before pipe
After pipe


About pipes

Pipe buffering


Pipe end-of-file

Pipes and the shell

Full pipeline

Problem: How to move file descriptors around?

Initial shell
After pipe system call
Full pipeline


Pipe dance

Full pipeline

Pipe dance explained