Thread-safe wrappers for malloc and friends

This module provides wrappers for malloc, calloc, realloc and free that provide mutually exclusive access to those functions.

This module provides wrappers for malloc, calloc, realloc and free that provide mutually exclusive access to those functions.

Warning

This module is automatically selected, if needed. Never add it manually.

Background

Without support of the OS (or resorting to disabling IRQs), the standard C library is unable to guarantee that at most one thread at a time accesses the heap management data structures. Some C libraries provide hooks for locking (e.g. picolibc and newlib do so optionally), others (e.g. AVR libc) don't. By providing wrapper functions for malloc() and friends and instructing the linker to link to those instead of their actual implementations, we can provide thread safe access to the heap regardless of C libraries support.

Usage

This module is intended to be use by platforms not providing the required locking with other means automatically. Hence, application developers and users should never select this module by hand.