switch_to.h

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/*
 * Task switching for PKUnity SoC and UniCore ISA
 *
 * Copyright (C) 2001-2012 GUAN Xue-tao
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#ifndef __UNICORE_SWITCH_TO_H__
#define __UNICORE_SWITCH_TO_H__

struct task_struct;
struct thread_info;

/*
 * switch_to(prev, next) should switch from task `prev' to `next'
 * `prev' will never be the same as `next'.  schedule() itself
 * contains the memory barrier to tell GCC not to cache `current'.
 */
extern struct task_struct *__switch_to(struct task_struct *,
        struct thread_info *, struct thread_info *);

#define switch_to(prev, next, last)                 \
    do {                                \
        last = __switch_to(prev, task_thread_info(prev),    \
                    task_thread_info(next));    \
    } while (0)

#endif /* __UNICORE_SWITCH_TO_H__ */