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1#!/usr/bin/env python
2# Copyright (C) 2010 Gabor Rapcsanyi (rgabor@inf.u-szeged.hu), University of Szeged
3#
4# All rights reserved.
5#
6# Redistribution and use in source and binary forms, with or without
7# modification, are permitted provided that the following conditions
8# are met:
9# 1. Redistributions of source code must retain the above copyright
10#    notice, this list of conditions and the following disclaimer.
11# 2. Redistributions in binary form must reproduce the above copyright
12#    notice, this list of conditions and the following disclaimer in the
13#    documentation and/or other materials provided with the distribution.
14#
15# THIS SOFTWARE IS PROVIDED BY UNIVERSITY OF SZEGED ``AS IS'' AND ANY
16# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
18# PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL UNIVERSITY OF SZEGED OR
19# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
22# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
23# OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
25# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26
27import os
28import tempfile
29import unittest
30
31from webkitpy.common.system.file_lock import FileLock
32
33
34class FileLockTest(unittest.TestCase):
35
36    def setUp(self):
37        self._lock_name = "TestWebKit" + str(os.getpid()) + ".lock"
38        self._lock_path = os.path.join(tempfile.gettempdir(), self._lock_name)
39        self._file_lock1 = FileLock(self._lock_path, 1)
40        self._file_lock2 = FileLock(self._lock_path, 1)
41
42    def tearDown(self):
43        self._file_lock1.release_lock()
44        self._file_lock2.release_lock()
45
46    def test_lock_lifecycle(self):
47        # Create the lock.
48        self._file_lock1.acquire_lock()
49        self.assertTrue(os.path.exists(self._lock_path))
50
51        # Try to lock again.
52        self.assertFalse(self._file_lock2.acquire_lock())
53
54        # Release the lock.
55        self._file_lock1.release_lock()
56        self.assertFalse(os.path.exists(self._lock_path))
57
58    def test_stuck_lock(self):
59        open(self._lock_path, 'w').close()
60        self._file_lock1.acquire_lock()
61        self._file_lock1.release_lock()
62