[issue8407] expose signalfd(2) and pthread_sigmask in the signal module

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

> New changeset f8c49a930015 by Victor Stinner in branch 'default':
> Issue #8407: The signal handler writes the signal number as a single byte

Wakeup test using two pending signals fails on FreeBSD 6.4 buildbot:

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FAIL: test_signum (test.test_signal.WakeupSignalTests)
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Traceback (most recent call last):
  File "/usr/home/db3l/buildarea/3.x.bolen-freebsd/build/Lib/test/test_signal.py", line 266, in test_signum
    self.check_signum(signal.SIGUSR1, signal.SIGALRM)
  File "/usr/home/db3l/buildarea/3.x.bolen-freebsd/build/Lib/test/test_signal.py", line 232, in check_signum
    self.assertSequenceEqual(raised, signals)
AssertionError: Sequences differ: (14,) != (30, 14)

Wakeup file only contains SIGALRM, not (SIGUSR1, SIGALRM), whereas SIGUSR1 is raised before SIGALRM.

Code of the test:
                                                                                
    def check_signum(self, *signals):                                           
        data = os.read(self.read, len(signals)+1)                               
        raised = struct.unpack('%uB' % len(data), data)                         
        self.assertSequenceEqual(raised, signals)

    def test_signum(self):                                                      
        old_handler = signal.signal(signal.SIGUSR1, lambda x,y:None)            
        self.addCleanup(signal.signal, signal.SIGUSR1, old_handler)             
        os.kill(os.getpid(), signal.SIGUSR1)                                    
        os.kill(os.getpid(), signal.SIGALRM)                                    
        self.check_signum(signal.SIGUSR1, signal.SIGALRM)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue8407>
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