Stop rt-test script from hanging

test/rt-test.py

@@ -1,3 +1,6 @@
+import atexit
+import queue
+import threading
 import subprocess
 import signal
 import re
@@ -6,15 +9,21 @@ import datetime
 import os
 import importlib.util
 
+msg_queue = queue.Queue(-1)
+proc = None
+
 class TestCase:
     def __init__(self, name, expected):
         self.name = name
         self.expected = expected
 
-def test_failure(case, exp, expected_idx, found):
-    print("FAILURE: %s #%d, expected '%s', found '%s'" %(case.name, expected_idx + 1, exp, found))
+def failure(msg):
+    print("FAILURE: %s" %(msg))
     sys.exit(1)
 
+def test_failure(case, exp, expected_idx, found):
+    failure("%s #%d, expected '%s', found '%s'" %(case.name, expected_idx + 1, exp, found))
+
 def test_pass(case, exp, expected_idx, found):
     print("PASS: %s #%d, expected '%s', found '%s'" %(case.name, expected_idx + 1, exp, found))
 
@@ -33,6 +42,15 @@ def get_post_archinit_cases():
             TestCase("Init finishes", [r"Init done"])
         ]
 
+def read_messages(proc):
+    while True:
+        line = proc.stdout.readline().decode("utf-8")
+        msg_queue.put(line)
+
+def cleanup():
+    global proc
+    os.killpg(os.getpgid(proc.pid), signal.SIGTERM)
+
 if __name__ == "__main__":
     arch = sys.argv[1]
     zig_path = sys.argv[2]
@@ -46,8 +64,12 @@ if __name__ == "__main__":
     cases = get_pre_archinit_cases() + arch_module.get_test_cases(TestCase) + get_post_archinit_cases()
 
     if len(cases) > 0:
-        proc = subprocess.Popen(zig_path + " build run -Drt-test=true", stdout=subprocess.PIPE, shell=True)
+        proc = subprocess.Popen(zig_path + " build run -Drt-test=true", stdout=subprocess.PIPE, shell=True, preexec_fn=os.setsid)
+        atexit.register(cleanup)
         case_idx = 0
+        read_thread = threading.Thread(target=read_messages, args=(proc,))
+        read_thread.daemon = True
+        read_thread.start()
         # Go through the cases
         while case_idx < len(cases):
             case = cases[case_idx]
@@ -55,9 +77,10 @@ if __name__ == "__main__":
             # Go through the expected log messages
             while expected_idx < len(case.expected):
                 e = r"\[INFO\] " + case.expected[expected_idx]
-                line = proc.stdout.readline().decode("utf-8")
-                if not line:
-                    break
+                try:
+                    line = msg_queue.get(block=True, timeout=5)
+                except queue.Empty:
+                    failure("Timed out waiting for '%s'" %(e))
                 line = line.strip()
                 pattern = re.compile(e)
                 # Pass if the line matches the expected pattern, else fail
@@ -67,5 +90,4 @@ if __name__ == "__main__":
                     test_failure(case, e, expected_idx, line)
                 expected_idx += 1
             case_idx += 1
-        proc.kill()
     sys.exit(0)