IO Model

Blocking I/O Model

• the most prevalent I/O model
• By default, all sockets are blocking.
• With Blocking I/O, system call return when:
• success
  • data copied to application space
• error
  • interrupted by signal (most common)
  • others
• Process blocked when calling these kind of system call.

NonBlocking I/O Model

• when set a socket to be nonblocking

int flags = fcntl(socket, F_GETFL, 0);
fcntl(socket, F_SETFL, flags | O_NONBLOCK);

I/O Multiplexing Model

• IO Multiplexing

Links

• IO