better locking

facelock.py

@@ -0,0 +1,34 @@
+#!/usr/bin/env python
+
+import subprocess
+import threading
+
+locker = subprocess.Popen([ "mlock" ])
+
+print("locker "+str(locker.pid)+" spawned")
+matcher = subprocess.Popen([ "sh", "-c", "./facematcher.py match -d 2 faces/$USER/*" ])
+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" ])

facematcher.py

@@ -28,7 +28,7 @@ def match(paths, cap, show):
         if cv2.mean(frame)[0] < 30:
             continue
 
-        scale = 0.25
+        scale = 0.5
         rgb_frame = cv2.cvtColor(frame, cv2.COLOR_GRAY2RGB)
         small_rgb_frame = cv2.resize(rgb_frame, (0, 0), fx=scale, fy=scale)