What is a reentrant code?

Reentrant (multi-instance) code is a reusable routine that multiple programs can invoke, interrupt, and reinvoke simultaneously. When you want to reuse code, but associate each instance of the shared code with unique, preserved data, use reentrant code.

What is reentrant function example?

Example of Reentrant Functions: If an interrupt that pauses its execution and shifts the control to fun1. After fun1 completes, the control is again transferred to fun2 and it reenters the execution phase.

What is the reentrant and not reentrant elements?

A reentrant function must not call non-reentrant functions. A non-reentrant function can often, but not always, be identified by its external interface and its usage. For example, the strtok subroutine is not reentrant, because it holds the string to be broken into tokens.

What is a non-reentrant code?

Description. The program defines a signal handler that calls a non-reentrant function. Extended Description. Non-reentrant functions are functions that cannot safely be called, interrupted, and then recalled before the first call has finished without resulting in memory corruption.

What are the conditions for a program to be reentrant?

To be reentrant, a computer program or routine: Must hold no static (or global) non-constant data. Must not return the address to static (or global) non-constant data. Must work only on the data provided to it by the caller.

What is a non reentrant code?

What is difference between reentrant and thread safe functions?

Thread safe code is one that can be performed from multiple threads safely, even if the calls happen simultaneously on multiple threads. Reentrant code is one that can be entered by another actor before an earlier invocation has finished, without affecting the path the first action would have taken through the code.

What makes a function non-reentrant?

A function can be non-reentrant if it uses memory that is not on the stack. If a function uses a static variable or a global variable, or a dynamically-allocated object that it finds for itself, then it is non-reentrant and any two calls to the function can interfere.

What is a reentrant structure?

Reentrant structures, with inwardly protruded frameworks in porous networks, were fabricated by the radial compression of vertically aligned honeycomb-like rGO/CNT networks, which were prepared by a directional crystallization method.

What is non reentrant code?