SemaphoreHandle_t mutex; // Create handle

void setup() {
  Serial.begin(115200);

  mutex = xSemaphoreCreateMutex(); //Create the mutex object

  xTaskCreate(
    print1,      // Function name of the task
    "print1",   // Name of the task (e.g. for debugging)
    2048,        // Stack size (bytes)
    NULL,        // Parameter to pass
    1,           // Task priority
    NULL         // Task handle
  );

  xTaskCreate(
    print2,     // Function name of the task
    "print2",  // Name of the task (e.g. for debugging)
    2048,       // Stack size (bytes)
    NULL,       // Parameter to pass
    1,          // Task priority
    NULL        // Task handle
  );
}

void print1(void *pvParameters) {
  while (1) {
    print_task(1);
  delay(1); // Short delay is needed!
  }
}

void print2(void *pvParameters) {
  while (1) {
    print_task(2);
 delay(1); // Short delay is needed!
  }
}

void loop() {
  print_task(3);
  delay(1);
}
void print_task(uint8_t t)
{
  xSemaphoreTake(mutex, portMAX_DELAY); // Take the mutex
  for (int i = 0; i < 10; i++) {
    Serial.print(t);
  }
  Serial.println("");
  xSemaphoreGive(mutex); // // Release the mutex
}