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#include <linuxcomp.h>
#include <linux/wait.h>
#include <linux/config.h>
#include <linux/list.h>

#include <kernel/types.h>

extern int task_activate(PID pid);
extern int exec_shadow;

struct task_struct {
        PID pid;
        int state;
        char comm[1024];
};

typedef struct task_struct task_t;

inline void init_waitqueue_head(wait_queue_head_t *q)
{
        q->lock = SPIN_LOCK_UNLOCKED;
        INIT_LIST_HEAD(&q->task_list);
}

static int try_to_wake_up(task_t * p, unsigned int state, int sync)
{
        task_activate(p->pid);
        return 0;
}

int default_wake_function(wait_queue_t *curr, unsigned mode, int sync)
{
        task_t *p = curr->task;
        return try_to_wake_up(p, mode, sync);
}

void __wake_up_common(wait_queue_head_t *q, unsigned int mode, int nr_exclusive, int sync)
{
        struct list_head *tmp, *next;

        list_for_each_safe(tmp, next, &q->task_list) {
                wait_queue_t *curr;
                unsigned flags;
               
                curr = list_entry(tmp, wait_queue_t, task_list);
                flags = curr->flags;
                curr->func(curr, mode, sync);
        }

}

void __wake_up(wait_queue_head_t *q, unsigned int mode, int nr_exclusive)
{
        unsigned long flags;

        spin_lock_irqsave(&q->lock, flags);
        __wake_up_common(q, mode, nr_exclusive, 0);
        spin_unlock_irqrestore(&q->lock, flags);
}

inline void __add_wait_queue(wait_queue_head_t *head, wait_queue_t *new)
{
        list_add(&new->task_list, &head->task_list);
}

void add_wait_queue(wait_queue_head_t *q, wait_queue_t * wait)
{
        unsigned long flags;

        wait->flags &= ~WQ_FLAG_EXCLUSIVE;
        spin_lock_irqsave(&q->lock, flags);
        __add_wait_queue(q, wait);
        spin_unlock_irqrestore(&q->lock, flags);
}

void remove_wait_queue(wait_queue_head_t *q, wait_queue_t * wait)
{
        unsigned long flags;

        spin_lock_irqsave(&q->lock, flags);
        __remove_wait_queue(q, wait);
        spin_unlock_irqrestore(&q->lock, flags);
}

inline int waitqueue_active(wait_queue_head_t *q)
{
        return !list_empty(&q->task_list);
}

inline void init_waitqueue_entry(wait_queue_t *q, struct task_struct *p)
{
        q->flags = 0;
        q->task = p;
        q->func = default_wake_function;
}

extern void * malloc(size_t size);

struct task_struct * get_current26(void)
{
        struct task_struct *tsp;
       
        tsp = malloc(sizeof(struct task_struct));
        if (!tsp)
        {
                printk(KERN_DEBUG "@get_current26 out of memory!!!\n");
                //
                // exit?
                //
        }
        tsp->pid = exec_shadow;

        //        printk(KERN_DEBUG "File: %s Pid=%d\n", __FILE__, tsp->pid);
        return tsp;
}