def play(self):
"""
Play the process.
"""
assert not self.__playing, \
"Cannot execute a process twice simultaneously"
try:
try:
MONITOR.register_process(self)
with self.__state_lock:
self._call_with_super_check(self.on_playing)
# Keep going until we run out of tasks
fn = self._next()
while fn is not None:
with self.__state_lock:
self._next_transition = None
fn()
fn = self._next()
except BaseException as e:
exc_type, value, tb = sys.exc_info()
self._perform_fail_noraise(e)
return
finally:
try:
MONITOR.deregister_process(self)
self._call_with_super_check(self.on_done_playing)
except BaseException as e:
if self.state != ProcessState.FAILED:
exc_type, value, tb = sys.exc_info()
self._perform_fail_noraise(e)
return self._outputs
def _on_start_playing(self):
self.__play_lock.acquire()
self.__interrupt_action = None
self._call_with_super_check(self.on_playing)
stack.push(self)
MONITOR.register_process(self)