Reentrancy is a programming concept where a function or subroutine can be interrupted and then resumed before it finishes executing. This means that the function can be called again before it completes its previous execution.

Apr 15, 2023 · Reentrant functions are used in applications like hardware interrupt handling, recursion, etc. The function has to satisfy certain conditions to be called as reentrant: 1. It may not use global and static data.

A computer program or routine is described as reentrant if it can be safely called again before its previous invocation has been completed (i.e it can be safely executed concurrently). To be reentrant, a computer program or routine: Must hold no static (or global) non-constant data.

May 14, 2013 · Re-entrant means that the function can be interrupted at any point, and be able to correctly finish executing after the interruption, even in cases when the same function is called one or more times in the interrupted state.

Reentrancy in general is a property of code where it has no central mutable state that could be corrupted if the code was called while it is executing. Such a call could be made by another thread, or it could be made recursively by an execution path originating from within the code itself.

Reentrancy is not an issue for routines that operate only on local data in the stack, but it is an issue when shared data are involved; interrupt routines normally need to deal with shared data. You can write a reentrant routine to swap two words, but it requires some sort of serialization.

A function is called reentrant if it can be interrupted in the middle of its execution and then safely be called again (“re-entered”) before its previous invocations complete execution. Interruption …

Reentrancy problems cause those non-reproducable and hard-to-find faults. Here's how to write firmware that avoids these issues.

Apr 25, 2012 · one that can be re-entered. This really applies to threading or interupts neither of which the older C standards address. So we don't know if any function is re. But in fact most of them could fairly easily be made reentrant (eg. sin, strcpy etc.).

May 19, 2024 · In computing, a computer program or subroutine is called reentrant if it can be interrupted in the middle of its execution and then safely called again ("re-entered") before its previous invocations complete execution.