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Re: [Qemu-devel] [PATCH] tls.h: Enable TLS on FreeBSD

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH] tls.h: Enable TLS on FreeBSD
Date: Mon, 24 Jun 2013 23:15:27 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130514 Thunderbird/17.0.6

Il 24/06/2013 21:21, Ed Maste ha scritto:
> Signed-off-by: Ed Maste <address@hidden>
> ---
> I have had this in a local tree for some time, and it is needed by the
> BSD-user work that is now being proposed.

At this time, qemu/tls.h is really just for cpu_single_env, so I think
this patch should be applied together with the bsd-user patches that
need it.

> As an aside, an abstraction was recently proposed for Open vSwtich that
> can use any of _Thread_local, __thread, or pthread_getspecific() which
> may make a convenient reference for someone wishing to implement one of
> the TODOs: http://openvswitch.org/pipermail/dev/2013-June/028665.html

I and Stefan Hajnoczi have almost the same idea implemented in QEMU
(except that get_foo() returns a pointer to the variable).  But
pthread_get/setspecific would be too slow for cpu_single_env, so we're
just switching to __thread for cpu_single_env (for Linux in our patches,
but you can add FreeBSD too once it's needed).


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