OPERATING SYSTEMS INPUT/OUTPUT -1

• mémoire - matière potentielle : location
• mémoire
• mémoire - matière potentielle : area

1 OPERATING SYSTEMS INPUT/OUTPUT -1 Progress so far : Established an environment in which: - processes can exist, and - memory can be allocated to hold programs & data How do processes communicate with the outside world? What are the mechanisms for the input & output of information? Traditionally: I/O has been the least amenable to systematic generalisation. WHY? wide variety of peripheral devices Æ different characteristics & modes of operation, i.

• device descriptor
• peripheral code
• iorb
• iorb-1 iorb-2 iorb
• user programs
• stream
• device
• request
• output
• process