Date: Wed, 22 Apr 2015 23:05:17 +0800 From: Julian Elischer <julian@freebsd.org> To: Dheeraj Kandula <dheerajktech@gmail.com>, freebsd-threads@freebsd.org Subject: Re: Clarification: Acquiring a mutex when a read write lock is held Message-ID: <5537B8AD.5060009@freebsd.org> In-Reply-To: <CAJ5QSa0bNy0gh_h=s=C8k2i7J4KvSBDEcMdDrtD8T0GPX3PZug@mail.gmail.com> References: <CAJ5QSa0bNy0gh_h=s=C8k2i7J4KvSBDEcMdDrtD8T0GPX3PZug@mail.gmail.com>
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On 4/21/15 6:30 PM, Dheeraj Kandula wrote:
> Hey All,
> Can you clarify the following
>
> I have a read write lock locked. Next I want to acquire a mutex when the
> read write lock is held. Is this allowed or not. As far as I can understand
> from the "FreeBSD Kernel Developers Handbook" this operation is allowed in
> FreeBSD9.0, 10.0 and further.
>
> But the read write lock cannot be held while sleeping. Doesn't this
> contradict the above statement, as a thread will go to sleep if can't
> acquire the mutex when another thread holds the mutex.
>
> Hence what sleep are we referring here. Is this sleep(unbounded sleep) or
look at
man 9 locking
for an overview.
> the bounded sleep.
>
> Dheeraj
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