1 /* 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 15 * License along with this library; if not, see <http://www.gnu.org/licenses/> 16 */ 17 18 /* 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) 23 24 #include <pthread.h> 25 #define spin_lock pthread_mutex_lock 26 #define spin_unlock pthread_mutex_unlock 27 #define spinlock_t pthread_mutex_t 28 #define SPIN_LOCK_UNLOCKED PTHREAD_MUTEX_INITIALIZER 29 30 #else 31 32 /* 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 */ 38 typedef int spinlock_t; 39 #define SPIN_LOCK_UNLOCKED 0 40 41 static inline void spin_lock(spinlock_t *lock) 42 { 43 } 44 45 static inline void spin_unlock(spinlock_t *lock) 46 { 47 } 48 49 #endif 50
