Slide 25 of 42

Notes:

Pipes - unidirectional communication from sender to receiver

- can only be used between related processes

FIFOs - also called named pipes

- unrelated processes can exchange data

Message queues - linked list of messages, identified by a message queue identifier

Semaphones - a counter used to provide access to a shared data object for multiple processes

Shared memory - memory region shared by multiple processes

- fastest form of IPC since data is not copied

>>> these 3 function groups found in library /lib/libsvipc.a

InterProcess Communication (IPC)

• Pipes
- pipe(fd[2])


• FIFOs
- mkfifo(pathname)


• Message queues
• Semaphores
• Shared memory