mirror of https://gitee.com/openkylin/qemu.git
50 lines
1.6 KiB
C
50 lines
1.6 KiB
C
/*
|
|
* Copyright (c) 2003 Fabrice Bellard
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, see <http://www.gnu.org/licenses/>
|
|
*/
|
|
|
|
/* configure guarantees us that we have pthreads on any host except
|
|
* mingw32, which doesn't support any of the user-only targets.
|
|
* So we can simply assume we have pthread mutexes here.
|
|
*/
|
|
#if defined(CONFIG_USER_ONLY)
|
|
|
|
#include <pthread.h>
|
|
#define spin_lock pthread_mutex_lock
|
|
#define spin_unlock pthread_mutex_unlock
|
|
#define spinlock_t pthread_mutex_t
|
|
#define SPIN_LOCK_UNLOCKED PTHREAD_MUTEX_INITIALIZER
|
|
|
|
#else
|
|
|
|
/* Empty implementations, on the theory that system mode emulation
|
|
* is single-threaded. This means that these functions should only
|
|
* be used from code run in the TCG cpu thread, and cannot protect
|
|
* data structures which might also be accessed from the IO thread
|
|
* or from signal handlers.
|
|
*/
|
|
typedef int spinlock_t;
|
|
#define SPIN_LOCK_UNLOCKED 0
|
|
|
|
static inline void spin_lock(spinlock_t *lock)
|
|
{
|
|
}
|
|
|
|
static inline void spin_unlock(spinlock_t *lock)
|
|
{
|
|
}
|
|
|
|
#endif
|