def __acquire_without_hubs(self, timeout):
thread_lock = self._allocate_lock()
thread_lock.acquire()
absolute_expiration = 0
begin = 0
if timeout:
absolute_expiration = monotonic() + timeout
# Cython won't compile a lambda here
link = _LockReleaseLink(thread_lock)
while 1:
self.__add_link(link)
if absolute_expiration:
begin = monotonic()
got_native = self.__spin_on_native_lock(thread_lock, timeout)
self._quiet_unlink_all(link)
if got_native:
if self.acquire(0):
return True
if absolute_expiration:
now = monotonic()
if now >= absolute_expiration:
return False
duration = now - begin
timeout -= duration
if timeout <= 0:
return False
def __spin_on_native_lock(self, thread_lock, timeout):
expiration = 0
if timeout:
expiration = monotonic() + timeout
self._drop_lock_for_switch_out()
try:
# TODO: When timeout is given and the lock supports that
# (Python 3), pass that.
# Python 2 has terrible behaviour where lock acquires can't
# be interrupted, so we use a spin loop
while not thread_lock.acquire(0):
if expiration and monotonic() >= expiration:
return False
_native_sleep(0.001)
return True
finally:
self._acquire_lock_for_switch_in()
