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100 lines
3.6 KiB
Python
100 lines
3.6 KiB
Python
5 years ago
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from threading import Event, Thread, current_thread
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from time import time
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from warnings import warn
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import atexit
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__all__ = ["TMonitor", "TqdmSynchronisationWarning"]
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class TqdmSynchronisationWarning(RuntimeWarning):
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"""tqdm multi-thread/-process errors which may cause incorrect nesting
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but otherwise no adverse effects"""
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pass
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class TMonitor(Thread):
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"""
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Monitoring thread for tqdm bars.
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Monitors if tqdm bars are taking too much time to display
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and readjusts miniters automatically if necessary.
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Parameters
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----------
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tqdm_cls : class
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tqdm class to use (can be core tqdm or a submodule).
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sleep_interval : fload
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Time to sleep between monitoring checks.
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"""
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# internal vars for unit testing
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_time = None
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_event = None
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def __init__(self, tqdm_cls, sleep_interval):
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Thread.__init__(self)
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self.daemon = True # kill thread when main killed (KeyboardInterrupt)
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self.was_killed = Event()
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self.woken = 0 # last time woken up, to sync with monitor
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self.tqdm_cls = tqdm_cls
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self.sleep_interval = sleep_interval
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if TMonitor._time is not None:
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self._time = TMonitor._time
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else:
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self._time = time
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if TMonitor._event is not None:
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self._event = TMonitor._event
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else:
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self._event = Event
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atexit.register(self.exit)
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self.start()
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def exit(self):
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self.was_killed.set()
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if self is not current_thread():
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self.join()
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return self.report()
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def get_instances(self):
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# returns a copy of started `tqdm_cls` instances
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return [i for i in self.tqdm_cls._instances.copy()
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# Avoid race by checking that the instance started
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if hasattr(i, 'start_t')]
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def run(self):
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cur_t = self._time()
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while True:
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# After processing and before sleeping, notify that we woke
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# Need to be done just before sleeping
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self.woken = cur_t
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# Sleep some time...
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self.was_killed.wait(self.sleep_interval)
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# Quit if killed
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if self.was_killed.is_set():
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return
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# Then monitor!
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# Acquire lock (to access _instances)
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with self.tqdm_cls.get_lock():
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cur_t = self._time()
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# Check tqdm instances are waiting too long to print
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instances = self.get_instances()
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for instance in instances:
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# Check event in loop to reduce blocking time on exit
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if self.was_killed.is_set():
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return
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# Only if mininterval > 1 (else iterations are just slow)
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# and last refresh exceeded maxinterval
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if instance.miniters > 1 and \
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(cur_t - instance.last_print_t) >= \
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instance.maxinterval:
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# force bypassing miniters on next iteration
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# (dynamic_miniters adjusts mininterval automatically)
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instance.miniters = 1
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# Refresh now! (works only for manual tqdm)
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instance.refresh(nolock=True)
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if instances != self.get_instances(): # pragma: nocover
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warn("Set changed size during iteration" +
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" (see https://github.com/tqdm/tqdm/issues/481)",
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TqdmSynchronisationWarning, stacklevel=2)
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def report(self):
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return not self.was_killed.is_set()
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