02615337ef
Since configure guarantees us that we have pthreads on all hosts except mingw (which doesn't support a USER_ONLY config), we can and should use the pthread_mutex based implementation of spin_lock() and spin_unlock() in all USER_ONLY cases. This means that all the inline-native-assembly code supporting the "USER_ONLY but not USE_NPTL" case can go away. The not-USER_ONLY case remains as empty implementations; there is no change in behaviour here. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
50 lines
1.6 KiB
C
50 lines
1.6 KiB
C
/*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>
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*/
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/* configure guarantees us that we have pthreads on any host except
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* mingw32, which doesn't support any of the user-only targets.
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* So we can simply assume we have pthread mutexes here.
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*/
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#if defined(CONFIG_USER_ONLY)
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#include <pthread.h>
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#define spin_lock pthread_mutex_lock
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#define spin_unlock pthread_mutex_unlock
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#define spinlock_t pthread_mutex_t
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#define SPIN_LOCK_UNLOCKED PTHREAD_MUTEX_INITIALIZER
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#else
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/* Empty implementations, on the theory that system mode emulation
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* is single-threaded. This means that these functions should only
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* be used from code run in the TCG cpu thread, and cannot protect
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* data structures which might also be accessed from the IO thread
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* or from signal handlers.
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*/
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typedef int spinlock_t;
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#define SPIN_LOCK_UNLOCKED 0
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static inline void spin_lock(spinlock_t *lock)
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{
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}
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static inline void spin_unlock(spinlock_t *lock)
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{
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}
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#endif
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