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pbrookd5975362008-06-07 20:50:51 +00001/*
2 * Copyright (c) 2003 Fabrice Bellard
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
Blue Swirl8167ee82009-07-16 20:47:01 +000015 * License along with this library; if not, see <http://www.gnu.org/licenses/>
pbrookd5975362008-06-07 20:50:51 +000016 */
17
Peter Maydell02615332011-01-31 18:26:40 +000018/* configure guarantees us that we have pthreads on any host except
19 * mingw32, which doesn't support any of the user-only targets.
20 * So we can simply assume we have pthread mutexes here.
21 */
22#if defined(CONFIG_USER_ONLY)
pbrookd5975362008-06-07 20:50:51 +000023
24#include <pthread.h>
25#define spin_lock pthread_mutex_lock
26#define spin_unlock pthread_mutex_unlock
Anthony Liguoric227f092009-10-01 16:12:16 -050027#define spinlock_t pthread_mutex_t
pbrookd5975362008-06-07 20:50:51 +000028#define SPIN_LOCK_UNLOCKED PTHREAD_MUTEX_INITIALIZER
29
30#else
31
Peter Maydell02615332011-01-31 18:26:40 +000032/* Empty implementations, on the theory that system mode emulation
33 * is single-threaded. This means that these functions should only
34 * be used from code run in the TCG cpu thread, and cannot protect
35 * data structures which might also be accessed from the IO thread
36 * or from signal handlers.
37 */
Anthony Liguoric227f092009-10-01 16:12:16 -050038typedef int spinlock_t;
pbrookd5975362008-06-07 20:50:51 +000039#define SPIN_LOCK_UNLOCKED 0
40
Anthony Liguoric227f092009-10-01 16:12:16 -050041static inline void spin_lock(spinlock_t *lock)
pbrookd5975362008-06-07 20:50:51 +000042{
43}
44
Anthony Liguoric227f092009-10-01 16:12:16 -050045static inline void spin_unlock(spinlock_t *lock)
pbrookd5975362008-06-07 20:50:51 +000046{
47}
pbrookd5975362008-06-07 20:50:51 +000048
49#endif