Bug 18483 – [DMC Libc] std.stdio.File is completely thread unsafe on Win32

A bug was reported on reddit here: https://www.reddit.com/r/d_language/comments/7yxwvm/why_do_my_threads_write_to_the_wrong_file/ And I narrowed it down to a DMC bug. I have filed the bug here: http://bugzilla.digitalmars.com/issues/show_bug.cgi?id=327 Not going to repeat the whole thing, the DMC bug uses D code to show the problem (I refuse to figure out how to make multiple threads in C on windows DMC ;) Long story short, there appears to be no thread safety when using FILE * and DMC. Other platforms (including windows 64-bit) seem unaffected. This seems related to issue 13727.

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