https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 8bb7eca972ad531c9b149c0a51ab43a417385813 authored by Linus Torvalds on 31 October 2021, 20:53:10 UTC
Linux 5.15
Linux 5.15
Tip revision: 8bb7eca
rwbase_rt.h
// 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(struct rwbase_rt *rwb)
{
return atomic_read(&rwb->readers) != READER_BIAS;
}
static __always_inline bool rw_base_is_contended(struct rwbase_rt *rwb)
{
return atomic_read(&rwb->readers) > 0;
}
#endif /* _LINUX_RWBASE_RT_H */