Non-Blocking System Call
A non-blocking system call is a system call that does not block. The calling process can continue execution while the operation is in progress and returns immediately when it’s complete.
The most important difference between blocking and non-blocking IO is how code behaves during the I/O operation: with a blocking IO, users must wait until data has been received before continuing execution; with a non-blocking IO, users don’t have to wait for anything at all!
The main advantage of non-blocking IO is that it allows users to continue with other tasks while waiting for the I/O operation to complete. This can be especially useful when writing concurrent programs, where there are many things happening at once (like multiple threads).
Non-blocking IO is a bit harder to write than blocking IO, but it’s also much more powerful and flexible. This is because non-blocking IO allows users to perform multiple I/O operations at once, in any order.
Blocking and Nonblocking IO in Operating System
Blocking and non-blocking IO are two different methods used by OS to handle I/O operations. A blocking call is where the OS decides that it needs to wait for a certain operation to complete before allowing the program to continue execution. The result of this is that user can’t do anything else while waiting on a system call; if your program doesn’t have any other activity, then it should be able to wait indefinitely without causing any problems. On the other hand, non-blocking calls (also known as asynchronous operations) don’t block the thread until they finish their work; instead, this type of system call returns immediately after completing its job without having any effect on what’s happening in other threads.
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