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Annotation of qemu/qemu-tls.h, revision 1.1.1.1

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

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