def test_non_blocking_locking_without_previous_lock(locked_file, path_type, t1):
assert t1.store != store
path = path_type(locked_file)
# Try to lock first
assert store.try_aquire_lock(path) is True
assert store.have_lock(path) is True
store.release_lock(path)
assert store.have_lock(path) is False
def test_non_blocking_locking_while_already_locked(locked_file, path_type, t1):
assert t1.store != store
path = path_type(locked_file)
# Now take lock with t1.store
t1.lock()
# And now try to get the lock (which should not be possible)
assert store.try_aquire_lock(path) is False
assert store.have_lock(path) is False
def lock_with_pid_file(path: Path) -> None:
"""
Use this after daemonizing or in foreground mode to ensure there is only
one process running.
"""
if not store.try_aquire_lock(str(path)):
raise MKGeneralException("Failed to aquire PID file lock: "
"Another process is already running")
# Now that we have the lock we are allowed to write our pid to the file.
# The pid can then be used by the init script.
with path.open("w", encoding="utf-8") as f:
f.write("%d\n" % os.getpid())
def test_non_blocking_locking_while_already_locked(locked_file, path_type, t1):
assert t1.store != store
path = path_type(locked_file)
# Now take lock with t1.store
t1.do = "lock"
for _dummy in range(20):
if t1.store.have_lock(path):
break
time.sleep(0.01)
assert t1.store.have_lock(path) is True
# And now try to get the lock (which should not be possible)
assert store.try_aquire_lock(path) is False
assert t1.store.have_lock(path) is True
assert store.have_lock(path) is False
