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mp2_dispatch.h
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mp2_dispatch.h
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#ifndef MP2_DISPATCH_H
#define MP2_DISPATCH_H
#include <linux/sched.h>
#include "mp2_list.h"
extern struct mp2_task_struct * running_task;
extern struct task_struct * dispatch_thread;
extern struct mp2_task_struct task_list;
int LOW_PRIORITY=0;
int HIGH_PRIORITY=MAX_USER_RT_PRIO-1;
//MAX_USER_RT_PRIO-1
/*
* set the currently running task able to be preempted
*/
void set_old_running_task(void)
{
struct mp2_task_struct * ret;
if(running_task==NULL)
{
return;
}else
{
//running_task->state=READY;
printk(KERN_INFO "Dispatching_Thread: change running task of id: %d to READY \n",running_task->pid);
ret=set_mp2_task_state(running_task,READY);
if(ret==NULL) return;
struct sched_param sparam;
sparam.sched_priority=LOW_PRIORITY;
sched_setscheduler(running_task->linux_task,SCHED_NORMAL,&sparam);
set_task_state(running_task->linux_task,TASK_UNINTERRUPTIBLE);
}
}
/*
* set the new running task with the highest priority
*/
void set_new_running_task(struct mp2_task_struct * new_running_task)
{
struct mp2_task_struct * ret;
if(new_running_task==NULL)
{
return;
}else
{
printk(KERN_INFO "Dispatching_Thread: new task should be :%d ",new_running_task->pid);
//new_running_task->state=RUNNING;
ret=set_mp2_task_state(new_running_task,RUNNING);
running_task= ret;
if(ret!=NULL)
{
struct sched_param sparam;
sparam.sched_priority=HIGH_PRIORITY;
sched_setscheduler(new_running_task->linux_task,SCHED_FIFO,&sparam);
wake_up_process(new_running_task->linux_task);
}
}
}
/*
* the function in the dispatching thread
*/
int mp2_dispatch_fn(void* data)
{
struct mp2_task_struct * new_running_task;
while(1)
{
if(kthread_should_stop()) return 1;
set_current_state(TASK_UNINTERRUPTIBLE);
printk(KERN_INFO "Dispatching Thread: Start! \n");
set_old_running_task();
new_running_task=get_next_task();
set_new_running_task(new_running_task);
//put the dispatching thread to sleep
printk(KERN_INFO "Dispatching Thread: schedule()! \n");
schedule();
}
return 0;
}
#endif
/*
* this is the scheduler
* dispatching thread triggering context switch
* it will work after yield message or wakeup_time expires
*/
/*void dispatch()
{
// Preempt the current running task
if (running_task != NULL)
{
struct sched_param sparam;
sparam.sched_priority = 0;
sched_setscheduler(task, SCHED_NORMAL, &sparam);
running_task->state = READY;
}
mp2_task_struct * task = get_next_task();
if (task != NULL)
{
struct sched_param sparam;
wake_up_process(task);
sparam.sched_priority = MAX_USER_RT_PRIO - 1;
sched_setscheduler(task, SCHED_FIFO, &sparam);
}
}*/