When should I use reentrant functions?

What are reentrant functions and when should I use them?

Reentrant functions are functions that can be interrupted and safely called again ('re-entered') before the previous executions complete. You should use them in multi-threaded environments where functions might be executed concurrently.

Can you give me an example of a reentrant function?

Sure! A classic example is a function that performs simple arithmetic operations without using shared state or global variables. For instance, a function that adds two numbers and returns the result is reentrant.

What about non-reentrant functions? Why should I avoid them?

Non-reentrant functions can lead to issues like race conditions and data corruption when accessed by multiple threads simultaneously. It's best to avoid them in concurrent programming.

How can I make a function reentrant?

To make a function reentrant, avoid using static or global variables, and ensure that it only uses local variables or parameters passed to it.