[Python-checkins] cpython: Issue #12363: improve siginterrupt() tests

[victor.stinner]

http://hg.python.org/cpython/rev/aff0a7b0cb12
changeset:   70928:aff0a7b0cb12
user:        Victor Stinner <victor.stinner at haypocalc.com>
date:        Wed Jun 22 22:15:51 2011 +0200
summary:
  Issue #12363: improve siginterrupt() tests

Add a basic synchronization code between the child and the parent processes:
the child writes "ready" to stdout.

files:
  Lib/test/test_signal.py |  7 +++++++
  1 files changed, 7 insertions(+), 0 deletions(-)


diff --git a/Lib/test/test_signal.py b/Lib/test/test_signal.py
--- 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"

-- 
Repository URL: http://hg.python.org/cpython