#include "FreeRTOS.h"
#include "task.h"
#include "semphr.h"

  TaskHandle_t th1,th2,th3;
  SemaphoreHandle_t sh;
  int x;

  void task_1(void* p)
   {
	for ( ;; )
	{
		if(xSemaphoreTake(sh,500)==0) {
		printf("Task 1 Failed to take mutex within 500ms\n");
		}
		else {
			   x=1;
			   printf("Task 1 took mutex and x=%u\n",x);
			  }
		xSemaphoreGive(sh);
	    vTaskDelay(1000);
	}
}

void task_2(void* p)
{
	for ( ;; )
	{
		if(xSemaphoreTake(sh,500)==0) {
		printf("Task 2 Failed to take mutex within 500ms\n");
		}
		else {
			   x=2;
			   printf("Task 2 took mutex and x=%u\n",x);
			 }
		xSemaphoreGive(sh);
	    vTaskDelay(1000);
	}
}

void task_3(void* p)
{
	for ( ;; )
	{
		if(xSemaphoreTake(sh,500)==0) {
		printf("Task 3 Failed to take mutex within 500ms\n");
		}
		else {
			   x=3;
			   printf("Task 3 took mutex and x=%u\n",x);
			  }
		xSemaphoreGive(sh);
		vTaskDelay(1000);
	}
	
}

int Example3(void)
{
	sh=xSemaphoreCreateMutex();
	
	xTaskCreate(task_1, "Task 1", 1024, NULL, 1, &th1);
	xTaskCreate(task_2, "Task 2", 1024, NULL, 2, &th2);
	xTaskCreate(task_3, "Task 3", 1024, NULL, 3, &th3);
	
	vTaskStartScheduler();
	
	for ( ; ; );
}