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