Don't worry so much about the thread-safety. I know what I'm doing there, and things will be thread-safe. I'm a semi-competent programmer who went on a bit of a hiatus so things are a bit rusty.
No offense to you, but that is honestly the worst attitude one can have.
If people have advice, you should really listen to them before deciding that you don't need them (and even so, you should really consider the implications of they've said).
Originally Posted by Adak
io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
Originally Posted by Salem
You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.
Outside of your DOS world, your header file is meaningless.