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Backport fixes on test_eintr 

* Issue #25234: Skip test_eintr.test_open() under OS X to avoid hanging
* Issue #25868: Try to make test_eintr.test_sigwaitinfo() more reliable
  especially on slow buildbots. Use a pipe to synchronize the parent and the
  child processes.
This commit is contained in:
Victor Stinner 2016-01-28 18:13:45 +01:00
parent ad13edb6fd
commit 8f475effbc
1 changed files with 17 additions and 5 deletions
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22
Lib/test/eintrdata/eintr_tester.py
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@ -334,10 +334,12 @@ class SocketEINTRTest(EINTRBaseTest):
self._test_open("fp = open(path, 'r')\nfp.close()",
self.python_open)
@unittest.skipIf(sys.platform == 'darwin', "hangs under OS X; see issue #25234")
def os_open(self, path):
fd = os.open(path, os.O_WRONLY)
os.close(fd)
@unittest.skipIf(sys.platform == "darwin", "hangs under OS X; see issue #25234")
def test_os_open(self):
self._test_open("fd = os.open(path, os.O_RDONLY)\nos.close(fd)",
self.os_open)
@ -370,10 +372,10 @@ class SignalEINTRTest(EINTRBaseTest):
@unittest.skipUnless(hasattr(signal, 'sigwaitinfo'),
'need signal.sigwaitinfo()')
def test_sigwaitinfo(self):
# Issue #25277: The sleep is a weak synchronization between the parent
# and the child process. If the sleep is too low, the test hangs on
# slow or highly loaded systems.
self.sleep_time = 2.0
# Issue #25277, #25868: give a few miliseconds to the parent process
# between os.write() and signal.sigwaitinfo() to works around a race
# condition
self.sleep_time = 0.100
signum = signal.SIGUSR1
pid = os.getpid()
@ -381,18 +383,28 @@ class SignalEINTRTest(EINTRBaseTest):
old_handler = signal.signal(signum, lambda *args: None)
self.addCleanup(signal.signal, signum, old_handler)
rpipe, wpipe = os.pipe()
code = '\n'.join((
'import os, time',
'pid = %s' % os.getpid(),
'signum = %s' % int(signum),
'sleep_time = %r' % self.sleep_time,
'rpipe = %r' % rpipe,
'os.read(rpipe, 1)',
'os.close(rpipe)',
'time.sleep(sleep_time)',
'os.kill(pid, signum)',
))
t0 = time.monotonic()
proc = self.subprocess(code)
proc = self.subprocess(code, pass_fds=(rpipe,))
os.close(rpipe)
with kill_on_error(proc):
# sync child-parent
os.write(wpipe, b'x')
os.close(wpipe)
# parent
signal.sigwaitinfo([signum])
dt = time.monotonic() - t0