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Re: [Qemu-devel] [PATCH 2/7] store thread-specific env information

From: Andreas Färber
Subject: Re: [Qemu-devel] [PATCH 2/7] store thread-specific env information
Date: Sun, 29 Nov 2009 17:00:50 +0100

Am 29.11.2009 um 16:42 schrieb Avi Kivity:

On 11/29/2009 05:38 PM, Andreas Färber wrote:

Am 29.11.2009 um 16:29 schrieb Avi Kivity:

On 11/26/2009 07:24 PM, Glauber Costa wrote:
Since we'll have multiple cpu threads, at least for kvm, we need a way to store and retrieve the CPUState associated with the current execution thread.
For the I/O thread, this will be NULL.

I am using pthread functions for that, for portability, but we could as well
use __thread keyword.

Where is __thread not supported?

Apple, Sun.

Well, pthread_getspecific is around 130 bytes of code, whereas __thread is just on instruction. Maybe we should support both.

Maybe. Mono does so, they have some autoconf-based check plus a configure switch --with-tls={pthread|__thread} to override.


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