from machine import Pin
import time
import _thread

button = Pin(14, Pin.IN, Pin.PULL_DOWN)
led = Pin(15, Pin.OUT)

# Global variable and lock
global button_pressed
button_pressed = False
lock = _thread.allocate_lock()  # Create a lock

def button_thread():
    global button_pressed
    
    while True:
        if button.value() == 1:
            lock.acquire()  # Manually acquire lock
            button_pressed = True
            lock.release()  # Manually release lock
            print("Set state of global button_pressed to true...")
            time.sleep_ms(500)

_thread.start_new_thread(button_thread, ())

led.off()

while True:
    global button_pressed
    
    print("Checking state of global button_pressed...")
    
    lock.acquire()  # Manually acquire lock
    if button_pressed:
        led.on()
        print("Cross street light on...")
        time.sleep(5)
        led.off()
        print("Cross street light off...")
        button_pressed = False
        print("Set state of global button_pressed to false...")
    lock.release()  # Manually release lock
        
    time.sleep_ms(2000)