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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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C
123456789101112131415161718192021222324252627282930313233343536373839404142434445// SPDX-License-Identifier: GPL-2.0-only#ifndef _LINUX_RWBASE_RT_H#define _LINUX_RWBASE_RT_H
#include <linux/rtmutex.h>#include <linux/atomic.h>
#define READER_BIAS (1U << 31)#define WRITER_BIAS (1U << 30)
struct rwbase_rt { atomic_t readers; struct rt_mutex_base rtmutex;};
#define __RWBASE_INITIALIZER(name) \{ \ .readers = ATOMIC_INIT(READER_BIAS), \ .rtmutex = __RT_MUTEX_BASE_INITIALIZER(name.rtmutex), \}
#define init_rwbase_rt(rwbase) \ do { \ rt_mutex_base_init(&(rwbase)->rtmutex); \ atomic_set(&(rwbase)->readers, READER_BIAS); \ } while (0)
static __always_inline bool rw_base_is_locked(const struct rwbase_rt *rwb){ return atomic_read(&rwb->readers) != READER_BIAS;}
static __always_inline bool rw_base_is_write_locked(const struct rwbase_rt *rwb){ return atomic_read(&rwb->readers) == WRITER_BIAS;}
static __always_inline bool rw_base_is_contended(const struct rwbase_rt *rwb){ return atomic_read(&rwb->readers) > 0;}
#endif /* _LINUX_RWBASE_RT_H */