| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Copyright (c) 2019-20 RedHat, Inc. |
| * All Rights Reserved. |
| */ |
| #ifndef __LIBXFS_SPINLOCK_H__ |
| #define __LIBXFS_SPINLOCK_H__ |
| |
| /* |
| * This implements kernel compatible spinlock exclusion semantics. These, |
| * however, are not spinlocks, as spinlocks cannot be reliably implemented in |
| * userspace without using realtime scheduling task contexts. Hence this |
| * interface is implemented with pthread mutexes and so can block, but this is |
| * no different to the kernel RT build which replaces spinlocks with mutexes. |
| * Hence we know it works. |
| */ |
| |
| typedef pthread_mutex_t spinlock_t; |
| |
| #define spin_lock_init(l) pthread_mutex_init(l, NULL) |
| #define spin_lock(l) pthread_mutex_lock(l) |
| #define spin_trylock(l) (pthread_mutex_trylock(l) != EBUSY) |
| #define spin_unlock(l) pthread_mutex_unlock(l) |
| |
| #endif /* __LIBXFS_SPINLOCK_H__ */ |
