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reactor: Prevent update_timer() from running a single timer multiple times

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The "lazy" greenlet implementation could allow the same timer to run
multiple times in parallel if the first timer instance calls pause()
and another task calls update_timer().  This is confusing and can
cause hard to debug errors.  Add a new timer_is_running flag to
prevent it.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2025-09-03 13:45:13 -04:00
parent 6c1a4a825d
commit aa59b32031
1 changed files with 6 additions and 1 deletions
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7
klippy/reactor.py
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@ -1,6 +1,6 @@
# File descriptor and timer event helper
#
# Copyright (C) 2016-2020 Kevin O'Connor <kevin@koconnor.net>
# Copyright (C) 2016-2025 Kevin O'Connor <kevin@koconnor.net>
#
# This file may be distributed under the terms of the GNU GPLv3 license.
import os, gc, select, math, time, logging, queue
@ -14,6 +14,7 @@ class ReactorTimer:
def __init__(self, callback, waketime):
self.callback = callback
self.waketime = waketime
self.timer_is_running = False
class ReactorCompletion:
class sentinel: pass
@ -118,6 +119,8 @@ class SelectReactor:
return tuple(self._last_gc_times)
# Timers
def update_timer(self, timer_handler, waketime):
if timer_handler.timer_is_running:
return
timer_handler.waketime = waketime
self._next_timer = min(self._next_timer, waketime)
def register_timer(self, callback, waketime=NEVER):
@ -155,7 +158,9 @@ class SelectReactor:
waketime = t.waketime
if eventtime >= waketime:
t.waketime = self.NEVER
t.timer_is_running = True
t.waketime = waketime = t.callback(eventtime)
t.timer_is_running = False
if g_dispatch is not self._g_dispatch:
self._next_timer = min(self._next_timer, waketime)
self._end_greenlet(g_dispatch)