From: Paolo Bonzini <pbonzini@redhat.com>
To: Brad <brad@comstyle.com>
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH] qemu-thread: add TLS wrappers
Date: Tue, 16 Aug 2011 23:55:07 -0700 [thread overview]
Message-ID: <4E4B65CB.70603@redhat.com> (raw)
In-Reply-To: <4E4B4557.2050505@comstyle.com>
On 08/16/2011 09:36 PM, Brad wrote:
>
>> Win32 emulated TLS is slow and is not available on all versions of GCC.
>> Actually, Win32 does have support for decent TLS, only GCC does not map
>> __thread to it. The good news is, it's perfectly possible to declare
>> TLS variables with simple C code!
>>
>> This patch adds wrappers to qemu-thread that will use __thread on POSIX
>> systems, and the .tls segment on Windows.
>
> The actual use of TLS within QEMU on POSIX systems will be optional
> though, right?
Actually, TLS is already mandatory for both POSIX and Win32 systems.
This patch tries to improve the situation on Windows, both by allowing
older GCC versions, and by making TLS faster. On ELF systems, TLS has
been supported by GCC for perhaps 10 years, there's no reason to care.
Paolo
next prev parent reply other threads:[~2011-08-17 6:55 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-16 18:51 [Qemu-devel] [PATCH] qemu-thread: add TLS wrappers Paolo Bonzini
2011-08-17 4:36 ` Brad
2011-08-17 6:55 ` Paolo Bonzini [this message]
2011-08-17 17:28 ` Blue Swirl
2011-08-17 17:37 ` Paolo Bonzini
2011-08-17 19:00 ` Richard Henderson
2011-08-17 23:50 ` Brad
2011-08-17 23:51 ` Paolo Bonzini
2011-08-17 16:51 ` Stefan Hajnoczi
2011-08-17 17:13 ` Paolo Bonzini
2011-08-17 17:26 ` Stefan Hajnoczi
2011-08-17 17:28 ` Paolo Bonzini
2011-08-17 17:37 ` Blue Swirl
2011-08-17 17:45 ` Paolo Bonzini
2011-08-17 17:51 ` Blue Swirl
2011-08-17 18:03 ` Paolo Bonzini
2011-08-17 18:32 ` malc
2011-08-17 23:41 ` Brad
2011-08-17 17:34 ` Blue Swirl
2011-08-17 17:38 ` Paolo Bonzini
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