69 lines
1.9 KiB
Python
69 lines
1.9 KiB
Python
# The contents of this file are subject to the BitTorrent Open Source License
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# Version 1.1 (the License). You may not copy or use this file, in either
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# source code or executable form, except in compliance with the License. You
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# may obtain a copy of the License at http://www.bittorrent.com/license/.
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#
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# Software distributed under the License is distributed on an AS IS basis,
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# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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# for the specific language governing rights and limitations under the
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# License.
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# Written by Bram Cohen
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from select import select, error
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from time import sleep
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from types import IntType
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from bisect import bisect
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POLLIN = 1
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POLLOUT = 2
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POLLERR = 8
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POLLHUP = 16
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class poll(object):
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def __init__(self):
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self.rlist = []
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self.wlist = []
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def register(self, f, t):
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if type(f) != IntType:
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f = f.fileno()
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if (t & POLLIN) != 0:
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insert(self.rlist, f)
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else:
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remove(self.rlist, f)
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if (t & POLLOUT) != 0:
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insert(self.wlist, f)
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else:
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remove(self.wlist, f)
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def unregister(self, f):
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if type(f) != IntType:
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f = f.fileno()
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remove(self.rlist, f)
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remove(self.wlist, f)
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def poll(self, timeout = None):
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if self.rlist != [] or self.wlist != []:
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r, w, e = select(self.rlist, self.wlist, [], timeout)
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else:
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sleep(timeout)
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return []
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result = []
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for s in r:
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result.append((s, POLLIN))
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for s in w:
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result.append((s, POLLOUT))
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return result
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def remove(list, item):
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i = bisect(list, item)
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if i > 0 and list[i-1] == item:
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del list[i-1]
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def insert(list, item):
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i = bisect(list, item)
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if i == 0 or list[i-1] != item:
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list.insert(i, item)
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