10 Questions
What is the main issue with handling input from a TCP socket?
Non-determinism and concurrency
What is one solution to handle non-determinism and concurrency in I/O operations?
Use nonblocking I/O
How can the O_NONBLOCK flag be set using fcntl()?
flags = fcntl(sock,F_GETFL,0); fcntl(sock,F_SETFL,flags | O_NONBLOCK);
What happens when a process uses nonblocking I/O and no input is available?
The system call returns an error and sets errno to EWOULDBLOCK.
What is the advantage of using blocking I/O over nonblocking I/O?
Blocking I/O allows the Operating System to put the process to sleep when nothing is happening (no input).
What is the downside of using nonblocking I/O?
The process will 'busy-wait', using inefficiently the CPU time.
What is an alternative solution to nonblocking I/O for handling concurrency and I/O non-determinism?
Use alarm and signal handler to interrupt slow system calls.
How can multiple processes/threads be used to handle concurrency and I/O non-determinism?
Use multiple processes/threads to handle input from each source.
What type of functions can be used to check multiple input sources at the same time?
Functions that support checking of multiple input sources at the same time.
What is the purpose of the fcntl() system call in nonblocking I/O?
To set the O_NONBLOCK flag.
This quiz assesses your understanding of socket programming with UDP, including creating and managing connections, sending and receiving data, and closing sockets.
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