it does whats in the name, I dont know what else to say here.
This is mostly intended for debugging global alloc implementations, when allocating to print debug info would cause recursion.
This is thread safe, however it does not use any locking, so there may be some issues with interleaved output when using multithreading.
rust stable 1.56.1
currently only #[cfg(unix)] platforms (so no windows). PRs adding support for other platforms are welcome!