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#!/usr/bin/env python
#
# Copyright (C) 2018 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
import os
import threading
import time
import unittest
try:
from unittest import mock
except ImportError:
import mock
from host_controller import common
from host_controller.utils.ipc import file_lock_semaphore
class FileLockSemaphoreTest(unittest.TestCase):
"""Tests for FileLockSemaphore"""
def setUp(self):
self.sem = file_lock_semaphore.FileLockSemaphore("fls_test")
def tearDown(self):
os.remove(os.path.join(os.path.expanduser("~"), common._DEVLOCK_DIR, "fls_test"))
def testFileLockSemaphoreAcquire(self):
current_sem_value = self.sem.sem_value
self.sem.Acquire()
self.assertEqual(current_sem_value - 1, self.sem.sem_value)
self.sem.Release()
def testFileLockSemaphoreRelease(self):
self.sem.Acquire()
current_sem_value = self.sem.sem_value
self.sem.Release()
self.assertEqual(current_sem_value + 1, self.sem.sem_value)
def testFileLockSemaphoreOverflow(self):
current_sem_value = self.sem.sem_value
self.sem.Release()
self.assertEqual(current_sem_value, self.sem.sem_value)
def _AcquireRelease(self):
self.sem.Acquire()
self.assertEqual(self.sem.sem_value, 0)
self.sem.Release()
def testFileLockSemaphoreUnderflow(self):
for _ in range(common.MAX_ADB_FASTBOOT_PROCESS):
self.sem.Acquire()
file_lock_semaphore.MAX_SLEEP_TIME_IN_SECS = 2
self._thread = threading.Thread(target=self._AcquireRelease)
self._thread.daemon = True
self._thread.start()
time.sleep(1)
self.sem.Release()
self._thread.join()
if __name__ == "__main__":
unittest.main()
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