From: Eric Wong <normalperson@...>
Date: 2022-01-11T17:20:03+00:00
Subject: [ruby-core:107057] Re: [Ruby master Bug#18465] Make `IO#write` atomic.

"ioquatix (Samuel Williams)" <noreply@ruby-lang.org> wrote:
> By the way, even calling `write` directly is no guarantee of
> synchronous output between threads/processes - on Linux there
> is an informal guarantee of page-sized atomicity.

write(2) w/ O_APPEND on local FSes is atomic.  Preforked servers
(e.g. Apache) have been relying on that for decades to write log
files.

And PIPE_BUF for pipes/FIFOs is POSIX, (which equals page size on Linux).

> Bug #18465: Make `IO#write` atomic.
> https://bugs.ruby-lang.org/issues/18465#change-95859

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