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Re: [Qemu-devel] [PATCH] qemu-thread: add TLS wrappers
From: |
malc |
Subject: |
Re: [Qemu-devel] [PATCH] qemu-thread: add TLS wrappers |
Date: |
Wed, 17 Aug 2011 22:32:31 +0400 (MSD) |
User-agent: |
Alpine 2.00 (LNX 1167 2008-08-23) |
On Wed, 17 Aug 2011, Paolo Bonzini wrote:
> On 08/17/2011 10:51 AM, Blue Swirl wrote:
> > > Visual C++ supports __declspec(thread).
> > >
> > > pthread TLS is orders of magnitudes slower than __thread. __thread in an
> > > executable is just as fast as a non-TLS variable access, 2 or 3 machine
> > > language instructions at most.
> > >
> > > Some pthread_getspecific implementation do a_linear walk_ of the keys.
> > In
> > > that case it may work to have something like Windows plus a single
> > > pthread_getspecific key. On the other hand, Windows provides very good
> > > support for that thanks to its ordered subsections (.tls$something). It
> > > only needs a bit of preprocessor magic. Thinks such as linker scripts
> > would
> > > be way out of scope.
> >
> > According to this blog, also pthread_getspecific on OSX can amount to
> > three instructions except on PPC:
> > http://lifecs.likai.org/2010/05/mac-os-x-thread-local-storage.html
>
> I'll try to work out a DEFINE_TLS/DECLARE_TLS version for pthreads too.
>
> BTW, __thread is in C1X too though I don't remember how they called it.
>
thread_local 3.7.2 in n3290.pdf
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- Re: [Qemu-devel] [PATCH] qemu-thread: add TLS wrappers, (continued)
Re: [Qemu-devel] [PATCH] qemu-thread: add TLS wrappers, Stefan Hajnoczi, 2011/08/17
- Re: [Qemu-devel] [PATCH] qemu-thread: add TLS wrappers, Paolo Bonzini, 2011/08/17
- Re: [Qemu-devel] [PATCH] qemu-thread: add TLS wrappers, Stefan Hajnoczi, 2011/08/17
- Re: [Qemu-devel] [PATCH] qemu-thread: add TLS wrappers, Paolo Bonzini, 2011/08/17
- Re: [Qemu-devel] [PATCH] qemu-thread: add TLS wrappers, Blue Swirl, 2011/08/17
- Re: [Qemu-devel] [PATCH] qemu-thread: add TLS wrappers, Paolo Bonzini, 2011/08/17
- Re: [Qemu-devel] [PATCH] qemu-thread: add TLS wrappers, Blue Swirl, 2011/08/17
- Re: [Qemu-devel] [PATCH] qemu-thread: add TLS wrappers, Paolo Bonzini, 2011/08/17
- Re: [Qemu-devel] [PATCH] qemu-thread: add TLS wrappers,
malc <=
Re: [Qemu-devel] [PATCH] qemu-thread: add TLS wrappers, Brad, 2011/08/17
Re: [Qemu-devel] [PATCH] qemu-thread: add TLS wrappers, Blue Swirl, 2011/08/17
Re: [Qemu-devel] [PATCH] qemu-thread: add TLS wrappers, Paolo Bonzini, 2011/08/17