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from rpython.tool.udir import udir
import py
import sys
# not an applevel test: errno is not preserved
class TestMsvcrt:
def test_locking(self):
if sys.platform != 'win32':
py.test.skip("only on Windows")
filename = udir.join('locking_test')
filename.ensure()
import os, msvcrt, errno
msvcrt.locking
fd = os.open(str(filename), 0)
try:
msvcrt.locking(fd, 1, 1)
# lock again: it fails
e = raises(IOError, msvcrt.locking, fd, 1, 1)
assert e.value.errno == errno.EDEADLOCK
# unlock and relock sucessfully
msvcrt.locking(fd, 0, 1)
msvcrt.locking(fd, 1, 1)
finally:
os.close(fd)
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