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Issue #11998, issue #8407: workaround _tkinter issue in test_signal

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The _tkinter module loads the Tcl library which creates a thread waiting events
in select(). This thread receives signals blocked by all other threads. We
cannot test blocked signals if the _tkinter module is loaded.
This commit is contained in:
Victor Stinner 2011-05-04 12:38:03 +02:00
parent 55b5fa76a7
commit 6fd49e152a
1 changed files with 16 additions and 3 deletions
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19
Lib/test/test_signal.py
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@ -517,6 +517,15 @@ class PthreadSigmaskTests(unittest.TestCase):
# function. # function.
faulthandler.cancel_dump_tracebacks_later() faulthandler.cancel_dump_tracebacks_later()
# Issue #11998: The _tkinter module loads the Tcl library which creates
# a thread waiting events in select(). This thread receives signals
# blocked by all other threads. We cannot test blocked signals if the
# _tkinter module is loaded.
can_test_blocked_signals = ('_tkinter' not in sys.modules)
if not can_test_blocked_signals:
print("WARNING: _tkinter is loaded, cannot test signals "
"blocked by pthread_sigmask() (issue #11998)")
# Install our signal handler # Install our signal handler
old_handler = signal.signal(signum, handler) old_handler = signal.signal(signum, handler)
self.addCleanup(signal.signal, signum, old_handler) self.addCleanup(signal.signal, signum, old_handler)
@ -530,7 +539,8 @@ class PthreadSigmaskTests(unittest.TestCase):
# Block and then raise SIGUSR1. The signal is blocked: the signal # Block and then raise SIGUSR1. The signal is blocked: the signal
# handler is not called, and the signal is now pending # handler is not called, and the signal is now pending
signal.pthread_sigmask(signal.SIG_BLOCK, [signum]) signal.pthread_sigmask(signal.SIG_BLOCK, [signum])
os.kill(pid, signum) if can_test_blocked_signals:
os.kill(pid, signum)
# Check the new mask # Check the new mask
blocked = read_sigmask() blocked = read_sigmask()
@ -538,8 +548,11 @@ class PthreadSigmaskTests(unittest.TestCase):
self.assertEqual(set(old_mask) ^ set(blocked), {signum}) self.assertEqual(set(old_mask) ^ set(blocked), {signum})
# Unblock SIGUSR1 # Unblock SIGUSR1
with self.assertRaises(ZeroDivisionError): if can_test_blocked_signals:
# unblock the pending signal calls immediatly the signal handler with self.assertRaises(ZeroDivisionError):
# unblock the pending signal calls immediatly the signal handler
signal.pthread_sigmask(signal.SIG_UNBLOCK, [signum])
else:
signal.pthread_sigmask(signal.SIG_UNBLOCK, [signum]) signal.pthread_sigmask(signal.SIG_UNBLOCK, [signum])
with self.assertRaises(ZeroDivisionError): with self.assertRaises(ZeroDivisionError):
os.kill(pid, signum) os.kill(pid, signum)