X-Git-Url: https://code.delx.au/bg-scripts/blobdiff_plain/f9c37d3e9223c407abe5775490b258fb8ad5bdac..1ad2850b8c0ec352f1d096882d961325604afd71:/asyncsched.py

diff --git a/asyncsched.py b/asyncsched.py
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+++ b/asyncsched.py
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+# Copyright 2008 James Bunton <jamesbunton@fastmail.fm>
+# Licensed for distribution under the GPL version 2, check COPYING for details
+# asyncore.loop() with delayed function calls
+
+import asyncore
+import heapq
+import signal
+import time
+
+tasks = []
+running = False
+
+class Task(object):
+	def __init__(self, delay, func, args=[], kwargs={}):
+		self.time = time.time() + delay
+		self.func = lambda: func(*args, **kwargs)
+	
+	def __cmp__(self, other):
+		return cmp(self.time, other.time)
+
+	def __call__(self):
+		f = self.func
+		self.func = None
+		if f:
+			return f()
+
+	def cancel(self):
+		assert self.func is not None
+		self.func = None
+
+def schedule(delay, func, args=[], kwargs={}):
+	task = Task(delay, func, args, kwargs)
+	heapq.heappush(tasks, task)
+	return task
+
+def loop(timeout=30.0, use_poll=False):
+	global running
+	running = True
+	oldhandler = signal.signal(signal.SIGTERM, exit)
+
+	while running:
+		now = time.time()
+		while tasks and tasks[0].time < now:
+			task = heapq.heappop(tasks)
+			task()
+
+		t = timeout
+		if tasks:
+			t = max(min(t, tasks[0].time - now), 0)
+
+		asyncore.loop(timeout=t, count=1, use_poll=use_poll)
+	
+	signal.signal(signal.SIGTERM, oldhandler)
+
+def exit(*args):
+	global running
+	running = False
+
+__all__ = ("schedule", "loop", "exit")
+