97 lines
3.0 KiB
Python
97 lines
3.0 KiB
Python
#
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# Copyright (C) 2011 Colin Walters <walters@verbum.org>
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the
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# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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# Boston, MA 02111-1307, USA.
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import os
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import sys
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import select
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import time
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class Mainloop(object):
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DEFAULT = None
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def __init__(self):
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self._running = True
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self.poll = None
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self._timeouts = []
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self._pid_watches = {}
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self._fd_callbacks = {}
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@classmethod
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def get(cls, context):
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if context is None:
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if cls.DEFAULT is None:
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cls.DEFAULT = cls()
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return cls.DEFAULT
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raise NotImplementedError("Unknown context %r" % (context, ))
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def _ensure_poll(self):
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if self.poll is None:
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self.poll = select.poll()
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def watch_fd(self, fd, callback):
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self._ensure_poll()
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self.poll.register(fd)
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self._fd_callbacks[fd] = callback
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def unwatch_fd(self, fd):
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self.poll.unregister(fd)
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del self._fd_callbacks[fd]
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def watch_pid(self, pid, callback):
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self._pid_watches[pid] = callback
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def timeout_add(self, ms, callback):
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self._timeouts.append((ms, callback))
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def quit(self):
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self._running = False
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def run_once(self):
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min_timeout = None
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if len(self._pid_watches) > 0:
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min_timeout = 500
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for (ms, callback) in self._timeouts:
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if (min_timeout is None) or (ms < min_timeout):
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min_timeout = ms
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origtime = time.time() * 1000
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self._ensure_poll()
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fds = self.poll.poll(min_timeout)
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for fd in fds:
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self._fd_callbacks[fd]()
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to_delete_pids = []
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for pid in self._pid_watches:
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(opid, status) = os.waitpid(pid, os.WNOHANG)
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if opid == pid:
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to_delete_pids.append(pid)
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self._pid_watches[pid](pid, status)
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for pid in to_delete_pids:
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del self._pid_watches[pid]
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newtime = time.time() * 1000
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diff = int(newtime - origtime)
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if diff < 0: diff = 0
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for i,(ms, callback) in enumerate(self._timeouts):
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remaining_ms = ms - diff
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if remaining_ms <= 0:
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callback()
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else:
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self._timeouts[i] = (remaining_ms, callback)
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def run(self):
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self._running = True
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while self._running:
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self.run_once()
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