85 lines
2.9 KiB
Python
85 lines
2.9 KiB
Python
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"""PyUnit testing that threads honor our signal semantics"""
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import unittest
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import thread
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import signal
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import os
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import sys
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from test.test_support import run_unittest, TestSkipped
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if sys.platform[:3] in ('win', 'os2') or sys.platform=='riscos':
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raise TestSkipped, "Can't test signal on %s" % sys.platform
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process_pid = os.getpid()
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signalled_all=thread.allocate_lock()
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def registerSignals((for_usr1, for_usr2, for_alrm)):
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usr1 = signal.signal(signal.SIGUSR1, for_usr1)
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usr2 = signal.signal(signal.SIGUSR2, for_usr2)
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alrm = signal.signal(signal.SIGALRM, for_alrm)
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return usr1, usr2, alrm
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# The signal handler. Just note that the signal occurred and
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# from who.
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def handle_signals(sig,frame):
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signal_blackboard[sig]['tripped'] += 1
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signal_blackboard[sig]['tripped_by'] = thread.get_ident()
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# a function that will be spawned as a separate thread.
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def send_signals():
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os.kill(process_pid, signal.SIGUSR1)
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os.kill(process_pid, signal.SIGUSR2)
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signalled_all.release()
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class ThreadSignals(unittest.TestCase):
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"""Test signal handling semantics of threads.
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We spawn a thread, have the thread send two signals, and
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wait for it to finish. Check that we got both signals
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and that they were run by the main thread.
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"""
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def test_signals(self):
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signalled_all.acquire()
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self.spawnSignallingThread()
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signalled_all.acquire()
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# the signals that we asked the kernel to send
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# will come back, but we don't know when.
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# (it might even be after the thread exits
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# and might be out of order.) If we haven't seen
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# the signals yet, send yet another signal and
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# wait for it return.
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if signal_blackboard[signal.SIGUSR1]['tripped'] == 0 \
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or signal_blackboard[signal.SIGUSR2]['tripped'] == 0:
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signal.alarm(1)
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signal.pause()
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signal.alarm(0)
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self.assertEqual( signal_blackboard[signal.SIGUSR1]['tripped'], 1)
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self.assertEqual( signal_blackboard[signal.SIGUSR1]['tripped_by'],
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thread.get_ident())
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self.assertEqual( signal_blackboard[signal.SIGUSR2]['tripped'], 1)
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self.assertEqual( signal_blackboard[signal.SIGUSR2]['tripped_by'],
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thread.get_ident())
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signalled_all.release()
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def spawnSignallingThread(self):
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thread.start_new_thread(send_signals, ())
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def test_main():
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global signal_blackboard
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signal_blackboard = { signal.SIGUSR1 : {'tripped': 0, 'tripped_by': 0 },
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signal.SIGUSR2 : {'tripped': 0, 'tripped_by': 0 },
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signal.SIGALRM : {'tripped': 0, 'tripped_by': 0 } }
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oldsigs = registerSignals((handle_signals, handle_signals, handle_signals))
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try:
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run_unittest(ThreadSignals)
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finally:
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registerSignals(oldsigs)
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if __name__ == '__main__':
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test_main()
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