futex-irq.h

来自「linux 内核源代码」· C头文件 代码 · 共 112 行

#ifndef __ASM_SH_FUTEX_IRQ_H
#define __ASM_SH_FUTEX_IRQ_H

#include <asm/system.h>

static inline int atomic_futex_op_xchg_set(int oparg, int __user *uaddr,
					   int *oldval)
{
	unsigned long flags;
	int ret;

	local_irq_save(flags);

	ret = get_user(*oldval, uaddr);
	if (!ret)
		ret = put_user(oparg, uaddr);

	local_irq_restore(flags);

	return ret;
}

static inline int atomic_futex_op_xchg_add(int oparg, int __user *uaddr,
					   int *oldval)
{
	unsigned long flags;
	int ret;

	local_irq_save(flags);

	ret = get_user(*oldval, uaddr);
	if (!ret)
		ret = put_user(*oldval + oparg, uaddr);

	local_irq_restore(flags);

	return ret;
}

static inline int atomic_futex_op_xchg_or(int oparg, int __user *uaddr,
					  int *oldval)
{
	unsigned long flags;
	int ret;

	local_irq_save(flags);

	ret = get_user(*oldval, uaddr);
	if (!ret)
		ret = put_user(*oldval | oparg, uaddr);

	local_irq_restore(flags);

	return ret;
}

static inline int atomic_futex_op_xchg_and(int oparg, int __user *uaddr,
					   int *oldval)
{
	unsigned long flags;
	int ret;

	local_irq_save(flags);

	ret = get_user(*oldval, uaddr);
	if (!ret)
		ret = put_user(*oldval & oparg, uaddr);

	local_irq_restore(flags);

	return ret;
}

static inline int atomic_futex_op_xchg_xor(int oparg, int __user *uaddr,
					   int *oldval)
{
	unsigned long flags;
	int ret;

	local_irq_save(flags);

	ret = get_user(*oldval, uaddr);
	if (!ret)
		ret = put_user(*oldval ^ oparg, uaddr);

	local_irq_restore(flags);

	return ret;
}

static inline int atomic_futex_op_cmpxchg_inatomic(int __user *uaddr,
						   int oldval, int newval)
{
	unsigned long flags;
	int ret, prev = 0;

	local_irq_save(flags);

	ret = get_user(prev, uaddr);
	if (!ret && oldval == prev)
		ret = put_user(newval, uaddr);

	local_irq_restore(flags);

	if (ret)
		return ret;

	return prev;
}

#endif /* __ASM_SH_FUTEX_IRQ_H */