sigusr1

sigusrexample.py

from   signal       import signal, SIGUSR1 
from   traceback    import format_stack 
from   sys          import stderr 


def dump_frame(sig, frame):
    if sig is SIGUSR1:
        stderr.write(''.join(format_stack(frame)))


def t1():
    from time import sleep 

    while True:
        sleep(3) 

def t0():
    return t1()


signal(SIGUSR1, dump_frame) 
t0()