From: Rich Felker <dalias@libc.org>
To: musl@lists.openwall.com
Subject: Re: [musl] No such process return value in pthread_getcpuclockid
Date: Mon, 10 Feb 2020 14:34:27 -0500 [thread overview]
Message-ID: <20200210193427.GR1663@brightrain.aerifal.cx> (raw)
In-Reply-To: <afab7ba6-7920-b746-ffa5-fd66c4e5d347@bell-sw.com>
On Mon, Feb 10, 2020 at 10:29:02PM +0300, Alexander Scherbatiy wrote:
> Hello,
>
> It seems that pthread_getcpuclockid does not properly handle non
> valid thread id argument.
>
> Below is a sample which calls pthread_getcpuclockid with NULL thread
> id. The expected result is ESRCH (No thread with the ID thread could
> be found). It crashes in my docker with Alpine Linux 3.11.3 (musl
> libc x86_64 1.1.24). It returns ESRCH on my Ubuntu system.
There's no such thing as a "null thread id". A pthread_t value is
either the id of a thread which is still valid (still running or
joinable and not yet joined), or *any* use of it produces undefined
behavior. There is no value reserved for a sentinel. If you need an
optional thread id variable/field, you need a separate validity flag
alongside it.
None of this is unique to musl; it's the way the POSIX threads
interfaces are designed.
Rich
next prev parent reply other threads:[~2020-02-10 19:34 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-10 19:29 Alexander Scherbatiy
2020-02-10 19:34 ` Rich Felker [this message]
2020-02-10 19:57 ` Alexander Scherbatiy
2020-02-10 20:14 ` Rich Felker
2020-02-11 9:16 ` Alexander Scherbatiy
2020-02-10 20:23 ` Markus Wichmann
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