Date: Tue, 5 Jan 2010 21:55:05 -0500 From: Alexander Kabaev <kabaev@gmail.com> To: Attilio Rao <attilio@freebsd.org> Cc: FreeBSD Current <freebsd-current@freebsd.org>, David Xu <davidxu@freebsd.org> Subject: Re: process-sharable pthread synchronous objects Message-ID: <20100105215505.451ff1da@kan.dnsalias.net> In-Reply-To: <3bbf2fe11001051838t38e872d3jae6c4f8be9e57ebc@mail.gmail.com> References: <4B43E358.609@freebsd.org> <3bbf2fe11001051838t38e872d3jae6c4f8be9e57ebc@mail.gmail.com>
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On Wed, 6 Jan 2010 03:38:35 +0100
Attilio Rao <attilio@freebsd.org> wrote:
> 2010/1/6 David Xu <davidxu@freebsd.org>:
> > I want to go further to make some pthread synchronous objects
> > process-sharable, do you guy think it is worthy ?
> > except mutex and condition variable, others like rwlock and spinlock
> > are relative simple.
>=20
> I'm afraid people is going to produce very messy system resulting in
> process shared mutexes where IPC or threads may be used and causing
> more harms than good.
> Besides that, semaphore can "emulate" a fair amount of locking
> features in a non-trivial fashion, forcing developers to think a lot
> about it, thus reducing the risk of error.
>=20
> Said that, I think that introducing shared semaphore has been a good
> idea, but I would not go further than that.
>=20
> Thanks,
> Attilio
>=20
>=20
I respectfully disagree and think having pthread-agnotsic locks
processes can use to synchronize access to, say, shared memory segment
content is a good think to have. People are perfectly capable of
screwing up any powerful tool they are given, but that is not the
reason to be held back.
Solaris had lwp_{mutex|cond} for ages and lived.
--=20
Alexander Kabaev
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