root / include / qemu / tls.h @ 5a37532d
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1 | 754fd932 | Peter Maydell | /*
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2 | 754fd932 | Peter Maydell | * Abstraction layer for defining and using TLS variables
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3 | 754fd932 | Peter Maydell | *
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4 | 754fd932 | Peter Maydell | * Copyright (c) 2011 Red Hat, Inc
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5 | 754fd932 | Peter Maydell | * Copyright (c) 2011 Linaro Limited
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6 | 754fd932 | Peter Maydell | *
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7 | 754fd932 | Peter Maydell | * Authors:
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8 | 754fd932 | Peter Maydell | * Paolo Bonzini <pbonzini@redhat.com>
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9 | 754fd932 | Peter Maydell | * Peter Maydell <peter.maydell@linaro.org>
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10 | 754fd932 | Peter Maydell | *
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11 | 754fd932 | Peter Maydell | * This program is free software; you can redistribute it and/or
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12 | 754fd932 | Peter Maydell | * modify it under the terms of the GNU General Public License as
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13 | 754fd932 | Peter Maydell | * published by the Free Software Foundation; either version 2 of
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14 | 754fd932 | Peter Maydell | * the License, or (at your option) any later version.
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15 | 754fd932 | Peter Maydell | *
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16 | 754fd932 | Peter Maydell | * This program is distributed in the hope that it will be useful,
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17 | 754fd932 | Peter Maydell | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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18 | 754fd932 | Peter Maydell | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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19 | 754fd932 | Peter Maydell | * GNU General Public License for more details.
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20 | 754fd932 | Peter Maydell | *
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21 | 754fd932 | Peter Maydell | * You should have received a copy of the GNU General Public License along
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22 | 754fd932 | Peter Maydell | * with this program; if not, see <http://www.gnu.org/licenses/>.
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23 | 754fd932 | Peter Maydell | */
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24 | 754fd932 | Peter Maydell | |
25 | 754fd932 | Peter Maydell | #ifndef QEMU_TLS_H
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26 | 754fd932 | Peter Maydell | #define QEMU_TLS_H
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27 | 754fd932 | Peter Maydell | |
28 | 754fd932 | Peter Maydell | /* Per-thread variables. Note that we only have implementations
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29 | 754fd932 | Peter Maydell | * which are really thread-local on Linux; the dummy implementations
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30 | 754fd932 | Peter Maydell | * define plain global variables.
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31 | 754fd932 | Peter Maydell | *
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32 | 754fd932 | Peter Maydell | * This means that for the moment use should be restricted to
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33 | 754fd932 | Peter Maydell | * per-VCPU variables, which are OK because:
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34 | 754fd932 | Peter Maydell | * - the only -user mode supporting multiple VCPU threads is linux-user
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35 | 754fd932 | Peter Maydell | * - TCG system mode is single-threaded regarding VCPUs
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36 | 754fd932 | Peter Maydell | * - KVM system mode is multi-threaded but limited to Linux
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37 | 754fd932 | Peter Maydell | *
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38 | 754fd932 | Peter Maydell | * TODO: proper implementations via Win32 .tls sections and
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39 | 754fd932 | Peter Maydell | * POSIX pthread_getspecific.
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40 | 754fd932 | Peter Maydell | */
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41 | 754fd932 | Peter Maydell | #ifdef __linux__
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42 | 754fd932 | Peter Maydell | #define DECLARE_TLS(type, x) extern DEFINE_TLS(type, x) |
43 | 754fd932 | Peter Maydell | #define DEFINE_TLS(type, x) __thread __typeof__(type) tls__##x |
44 | 4a2dd92d | Jan Kiszka | #define tls_var(x) tls__##x |
45 | 754fd932 | Peter Maydell | #else
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46 | 754fd932 | Peter Maydell | /* Dummy implementations which define plain global variables */
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47 | 754fd932 | Peter Maydell | #define DECLARE_TLS(type, x) extern DEFINE_TLS(type, x) |
48 | 754fd932 | Peter Maydell | #define DEFINE_TLS(type, x) __typeof__(type) tls__##x |
49 | 4a2dd92d | Jan Kiszka | #define tls_var(x) tls__##x |
50 | 754fd932 | Peter Maydell | #endif
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51 | 754fd932 | Peter Maydell | |
52 | 754fd932 | Peter Maydell | #endif |