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From: "Michael Kerrisk (man-pages)" <>
To: Kumar Kartikeya Dwivedi <>
Cc:, Carlos O'Donell <>,
	linux-man <>
Subject: Re: POSIX writer locks can't be recursive
Date: Fri, 26 Jun 2020 10:54:35 +0200
Message-ID: <> (raw)
In-Reply-To: <>

Hi Carlos,

Could you comment here, as this was your text in pthread_rwlockattr_setkind_np(3)?

On 6/25/20 2:32 PM, Kumar Kartikeya Dwivedi wrote:
> Hi,
> In pthread_rwlockattr_setkind_np(3), the explanation for
>> This is ignored by glibc because the POSIX requirement to support
>> recursive writer locks would cause this option to create trivial
>> deadlocks;
> I think this should be "reader locks" instead, since it is
> undefined[1] for a thread holding a write lock to call
> pthread_rwlock_wrlock(3) again (glibc returns EDEADLK, musl simply
> deadlocks). There's no such requirement in POSIX either. Please let me
> know if I'm missing something.
> [1]:



Michael Kerrisk
Linux man-pages maintainer;
Linux/UNIX System Programming Training:

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