Dual core utilization on a automation 2040 W mini

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I have been trying to use two cores for the automation 2040 w mini. No matter what I do I keep getting a core1 in use error . The code is simple and I still can’t get it to run

import machine

import utime # access internal clock of raspberry Pi Pico

import _thread # to access threading function

spLock = _thread.allocate_lock() # creating semaphore

def core1_task():
    while True:

        spLock.acquire() # acquiring semaphore lock

        print( "message from core_1")

        utime.sleep(0.5) # 0.5 sec or 500us delay

        spLock.release()

        _thread.start_new_thread(core1_task, ())

    while True:

        spLock.acquire()

        print( "message from Core_0 ")

        utime.sleep( 0.5)

        spLock.release()