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/* Public domain. */
#ifndef _LINUX_MUTEX_H
#define _LINUX_MUTEX_H
#include <sys/stdint.h>
#include <sys/rwlock.h>
#include <linux/list.h>
#include <linux/spinlock_types.h>
#define DEFINE_MUTEX(x) struct rwlock x = RWLOCK_INITIALIZER(#x)
#define mutex_lock_interruptible_nested(rwl, subc) \
mutex_lock_interruptible(rwl)
#define mutex_lock(rwl) rw_enter_write(rwl)
#define mutex_lock_nest_lock(rwl, sub) rw_enter_write(rwl)
#define mutex_lock_nested(rwl, sub) rw_enter_write(rwl)
#define mutex_trylock(rwl) (rw_enter(rwl, RW_WRITE | RW_NOSLEEP) == 0)
#define mutex_unlock(rwl) rw_exit_write(rwl)
#define mutex_is_locked(rwl) (rw_status(rwl) != 0)
#define mutex_destroy(rwl)
static inline int
mutex_lock_interruptible(struct rwlock *rwl)
{
if (rw_enter(rwl, RW_WRITE | RW_INTR) != 0)
return -EINTR;
return 0;
}
enum mutex_trylock_recursive_result {
MUTEX_TRYLOCK_FAILED,
MUTEX_TRYLOCK_SUCCESS,
MUTEX_TRYLOCK_RECURSIVE
};
static inline enum mutex_trylock_recursive_result
mutex_trylock_recursive(struct rwlock *rwl)
{
if (rw_status(rwl) == RW_WRITE)
return MUTEX_TRYLOCK_RECURSIVE;
if (mutex_trylock(rwl))
return MUTEX_TRYLOCK_SUCCESS;
return MUTEX_TRYLOCK_FAILED;
}
int atomic_dec_and_mutex_lock(volatile int *, struct rwlock *);
#endif
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