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#include <stdlib.h>

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#include <unistd.h>

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#include <sys/mman.h>

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#include <native/task.h>

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#include <native/timer.h>

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#include <native/mutex.h>

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#include <native/alarm.h>

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#include "applicfg.h"

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#include "can_driver.h"

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#include "timer.h"

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#define TIMERLOOP_TASK_CREATED        1

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RT_MUTEX CanFestival_mutex;

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RT_TASK timerloop_task;

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RTIME last_time_read;

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RTIME last_occured_alarm;

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RTIME last_alarm_set;

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char stop_timer=0;

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void cleanup_all(void)

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{

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	rt_task_delete(&timerloop_task);

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}

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void StopTimerLoop(void)

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{

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	stop_timer = 1;

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	rt_task_unblock(&timerloop_task);

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}

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void EnterMutex(void)

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{

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	rt_mutex_lock(&CanFestival_mutex, TM_INFINITE); 

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}

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void LeaveMutex(void)

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{

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	rt_mutex_unlock(&CanFestival_mutex);

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}

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void timerloop_task_proc(void *arg)

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{

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	int ret;

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	do{

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		do{

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			last_occured_alarm = last_alarm_set;

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			EnterMutex();

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			TimeDispatch();

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			LeaveMutex();

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			while ((ret = rt_task_sleep_until(last_alarm_set)) == -EINTR);

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		}while (ret == 0);

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	}while (!stop_timer);

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	printf("End of TimerLoop, code %d\n",ret);

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}

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void StartTimerLoop(TimerCallback_t init_callback)

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{

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	int ret;

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	stop_timer = 0;

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	char taskname[32];

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	snprintf(taskname, sizeof(taskname), "timerloop-%d", getpid());

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	mlockall(MCL_CURRENT | MCL_FUTURE);

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	//create timerloop_task

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	ret = rt_task_create(&timerloop_task, taskname, 0, 50, 0);

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	if (ret) {

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		printf("Failed to create timerloop_task, code %d\n",errno);

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		return;

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	}

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	getElapsedTime();

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	last_alarm_set = last_time_read;

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	last_occured_alarm = last_alarm_set;

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	SetAlarm(NULL, 0, init_callback, 0, 0);

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	// start timerloop_task

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	ret = rt_task_start(&timerloop_task,&timerloop_task_proc,NULL);

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	if (ret) {

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		printf("Failed to start timerloop_task, code %d\n",errno);

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		goto error;

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	}

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	return;

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error:

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	cleanup_all();

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}

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void CreateReceiveTask(CAN_PORT fd0, TASK_HANDLE *ReceiveLoop_task, void* ReceiveLoop_task_proc)

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{

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	int ret;

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	static int id = 0;

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	char taskname[32];

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	snprintf(taskname, sizeof(taskname), "canloop%d-%d", id, getpid());

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	id++;

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	mlockall(MCL_CURRENT | MCL_FUTURE);

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	//create timerloop_task

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	ret = rt_task_create(ReceiveLoop_task,taskname,0,50,0);

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	if (ret) {

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		printf("Failed to create ReceiveLoop_task number %d, code %d\n", id, errno);

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		return;

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	}

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	// start timerloop_task

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	ret = rt_task_start(ReceiveLoop_task,&ReceiveLoop_task_proc,(void*)fd0);

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	if (ret) {

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		printf("Failed to start ReceiveLoop_task number %d, code %d\n", id, errno);

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		return;

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	}

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}

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void WaitReceiveTaskEnd(TASK_HANDLE *Thread)

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{

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	rt_task_delete(Thread);

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}

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void setTimer(TIMEVAL value)

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{

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	last_alarm_set = (value == TIMEVAL_MAX) ? TIMEVAL_MAX : last_time_read + value;

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	rt_task_unblock(&timerloop_task);

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}

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TIMEVAL getElapsedTime(void)

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{

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	last_time_read = rt_timer_ticks2ns(rt_timer_read());

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	return last_time_read - last_occured_alarm;

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}