facematcher/facelock.py

#!/usr/bin/env python

# Lock with mlock, unlock when face is detected

import subprocess
import threading

locker = subprocess.Popen([ "mlock" ])
print("locker "+str(locker.pid)+" spawned")
matcher = subprocess.Popen([ "./facewaiter.py" ])
print("matcher "+str(matcher.pid)+" spawned")

def waitfor(x, others):
    code = x.wait()
    if code != 0:
        print(str(x.pid)+" died with code "+str(code)+"!")
    else:
        print(str(x.pid)+" died.")
        for other in others:
            if other.poll() == None:
                print("killing "+str(other.pid))
                other.terminate()

threads = [
    threading.Thread(target=waitfor, args=(locker, [ matcher ])),
    threading.Thread(target=waitfor, args=(matcher, [ locker ])),
]

for th in threads:
    th.start()

for th in threads:
    th.join()

subprocess.call([ "pkill", "i3lock" ])