Issue #12363: improve siginterrupt() tests
Add a basic synchronization code between the child and the parent processes:
the child writes "ready" to stdout.
diff --git a/Lib/test/test_signal.py b/Lib/test/test_signal.py
index e613f5b..8a5a408 100644
--- a/Lib/test/test_signal.py
+++ b/Lib/test/test_signal.py
@@ -333,6 +333,9 @@
def handler(signum, frame):
pass
+ print("ready")
+ sys.stdout.flush()
+
signal.signal(signal.SIGALRM, handler)
if interrupt is not None:
signal.siginterrupt(signal.SIGALRM, interrupt)
@@ -353,11 +356,15 @@
""" % (interrupt,)
with spawn_python('-c', code) as process:
try:
+ # wait until the child process is loaded and has started
+ first_line = process.stdout.readline()
+
stdout, stderr = process.communicate(timeout=3.0)
except subprocess.TimeoutExpired:
process.kill()
return False
else:
+ stdout = first_line + stdout
exitcode = process.wait()
if exitcode not in (2, 3):
raise Exception("Child error (exit code %s): %s"