#include <Arduino_FreeRTOS.h>
#include "semphr.h"

SemaphoreHandle_t serial_mutex;

void setup() {
  Serial.begin(9600);

  serial_mutex = xSemaphoreCreateMutex();

  xTaskCreate(task1, "print task", 128, NULL, 2, NULL);
  xTaskCreate(task2, "print task", 128, NULL, 2, NULL);
}

void loop() {
  //this code is empty
}

//how to use the taskYIELD(); --> it does the context switching 
void task1(void *pvParameters){
 // taskENTER_CRITICAL(); //suspends all task and interrupts 
  vTaskSuspendAll(); //suspends all task but not with the interrupts
  Serial.println("Something Important!");
 // taskEXIT_CRITICAL(); //resumes the task
  xTaskResumeAll(); //resumes all the task


  while(1){
    if(xSemaphoreTake(serial_mutex, portMAX_DELAY) == pdTRUE){
      Serial.println("hello from task1");
      xSemaphoreGive(serial_mutex);
      taskYIELD();  //this is to context switch
      vTaskDelay(1000/portTICK_PERIOD_MS);
    }
  }
}

void task2(void *pvParameters){
  while(1){
    if(xSemaphoreTake(serial_mutex, portMAX_DELAY) == pdTRUE){
      Serial.println("Hello from task2");
      xSemaphoreGive(serial_mutex);
      taskYIELD(); //this is to contex switch
      vTaskDelay(1000/portTICK_PERIOD_MS);
    }
  }
}