mirrors/qemu
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

qemu-tls.h: Add abstraction layer for TLS variables

Browse Source 
Add an abstraction layer for defining and using thread-local
variables. For the moment this is implemented only for Linux,
which means they can only be used in restricted circumstances.
The abstraction layer allows us to add POSIX and Win32 support
later.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Peter Maydell 2011-10-28 10:52:40 +01:00 committed by Anthony Liguori
parent 3e837b2c05
commit 754fd932be
1 changed files with 52 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

52
qemu-tls.h Normal file
View File

@ -0,0 +1,52 @@
/*
* Abstraction layer for defining and using TLS variables
*
* Copyright (c) 2011 Red Hat, Inc
* Copyright (c) 2011 Linaro Limited
*
* Authors:
* Paolo Bonzini <pbonzini@redhat.com>
* Peter Maydell <peter.maydell@linaro.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef QEMU_TLS_H
#define QEMU_TLS_H
/* Per-thread variables. Note that we only have implementations
* which are really thread-local on Linux; the dummy implementations
* define plain global variables.
*
* This means that for the moment use should be restricted to
* per-VCPU variables, which are OK because:
* - the only -user mode supporting multiple VCPU threads is linux-user
* - TCG system mode is single-threaded regarding VCPUs
* - KVM system mode is multi-threaded but limited to Linux
*
* TODO: proper implementations via Win32 .tls sections and
* POSIX pthread_getspecific.
*/
#ifdef __linux__
#define DECLARE_TLS(type, x) extern DEFINE_TLS(type, x)
#define DEFINE_TLS(type, x) __thread __typeof__(type) tls__##x
#define get_tls(x) tls__##x
#else
/* Dummy implementations which define plain global variables */
#define DECLARE_TLS(type, x) extern DEFINE_TLS(type, x)
#define DEFINE_TLS(type, x) __typeof__(type) tls__##x
#define get_tls(x) tls__##x
#endif
#endif