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Re: [PATCH] nptl: Fix join/tryjoin comments.
- From: Florian Weimer <fweimer at redhat dot com>
- To: Carlos O'Donell <carlos at redhat dot com>
- Cc: GNU C Library <libc-alpha at sourceware dot org>
- Date: Mon, 11 Feb 2019 22:37:18 +0100
- Subject: Re: [PATCH] nptl: Fix join/tryjoin comments.
- References: <firstname.lastname@example.org>
* Carlos O'Donell:
> This commit fixes several inaccurate comments in the implementation of
> __pthread_timedjoin_ex(), pthread_tryjoin_np, and lll_wait_tid, all of
> which are used to implement POSIX thread joining.
GNU style is not to use () after function names.
> Firstly, in pthread_tryjoin_np() we only attempt the join if a read of
> pd->tid == 0, because that means the thread has already been reaped by
> the kernel and we can safely join it without blocking.
> Secondly, all join implementations call the common
> __pthread_timedjoin_ex and only if abstime is NULL (block) do we
> actually need to use cancellation (to cancel the potentially infinite
I think the change regarding abstime == NULL is wrong. This is about
pthread_join/pthread_timedjoin_np (blocking) on the one hand and
pthread_tryjoin_np on the other (not blocking).