Thread for blinking LED?

[someOne]

i am going to write a little application which has an “initialization” phase.
this phase should end when the user entered some values in a web ui.
does it make sense to use a thread to show the user that his device is in the initialization phase (blinking the onboard LED) ? or is there another, better way to do so?
the device is an argon

[ScruffR]

Which onboard LED do you meant?
The D7 LED or the RGB LED?
For RGB LED patterns you could use this
https://docs.particle.io/reference/device-os/firmware/argon/#led-signaling

For simple D7 blink patterns you could use a Software Timer instead of spinning up a dedicated thread that cannot be stopped once it’s started.

For really trivial blink patterns you could even do something like this

void setup() {
  pinMode(D7, OUTPUT);
}
void loop() {
  digitalWrite(D7, (millis() >> 3) & 0x88); // >> 3 for speed / & 0x88 for pattern 
}