xref: /qemu/include/exec/mmap-lock.h (revision fc524567087c2537b5103cdfc1d41e4f442892b6) 
1 /*
2  * QEMU user-only mmap lock, with stubs for system mode
3  *
4  *  Copyright (c) 2003 Fabrice Bellard
5  *
6  * SPDX-License-Identifier: LGPL-2.1-or-later
7  */
8 #ifndef EXEC_MMAP_LOCK_H
9 #define EXEC_MMAP_LOCK_H
10 
11 #ifdef CONFIG_USER_ONLY
12 
13 void TSA_NO_TSA mmap_lock(void);
14 void TSA_NO_TSA mmap_unlock(void);
15 bool have_mmap_lock(void);
16 
mmap_unlock_guard(void * unused)17 static inline void mmap_unlock_guard(void *unused)
18 {
19     mmap_unlock();
20 }
21 
22 #define WITH_MMAP_LOCK_GUARD() \
23     for (int _mmap_lock_iter __attribute__((cleanup(mmap_unlock_guard))) \
24          = (mmap_lock(), 0); _mmap_lock_iter == 0; _mmap_lock_iter = 1)
25 
26 #else
27 
mmap_lock(void)28 static inline void mmap_lock(void) {}
mmap_unlock(void)29 static inline void mmap_unlock(void) {}
30 #define WITH_MMAP_LOCK_GUARD()
31 
32 #endif /* CONFIG_USER_ONLY */
33 #endif /* EXEC_MMAP_LOCK_H */
34