1 files changed, 68 insertions, 0 deletions
diff --git a/BitTorrent/selectpoll.py b/BitTorrent/selectpoll.py
new file mode 100644
index 0000000..d01f1ef
--- /dev/null
+++ b/BitTorrent/selectpoll.py
@@ -0,0 +1,68 @@
+# The contents of this file are subject to the BitTorrent Open Source License
+# Version 1.1 (the License).  You may not copy or use this file, in either
+# source code or executable form, except in compliance with the License.  You
+# may obtain a copy of the License at http://www.bittorrent.com/license/.
+#
+# Software distributed under the License is distributed on an AS IS basis,
+# WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the License
+# for the specific language governing rights and limitations under the
+# License.
+
+# Written by Bram Cohen
+
+from select import select, error
+from time import sleep
+from types import IntType
+from bisect import bisect
+POLLIN = 1
+POLLOUT = 2
+POLLERR = 8
+POLLHUP = 16
+
+
+class poll(object):
+
+    def __init__(self):
+        self.rlist = []
+        self.wlist = []
+        
+    def register(self, f, t):
+        if type(f) != IntType:
+            f = f.fileno()
+        if (t & POLLIN) != 0:
+            insert(self.rlist, f)
+        else:
+            remove(self.rlist, f)
+        if (t & POLLOUT) != 0:
+            insert(self.wlist, f)
+        else:
+            remove(self.wlist, f)
+        
+    def unregister(self, f):
+        if type(f) != IntType:
+            f = f.fileno()
+        remove(self.rlist, f)
+        remove(self.wlist, f)
+
+    def poll(self, timeout = None):
+        if self.rlist != [] or self.wlist != []:
+            r, w, e = select(self.rlist, self.wlist, [], timeout)
+        else:
+            sleep(timeout)
+            return []
+        result = []
+        for s in r:
+            result.append((s, POLLIN))
+        for s in w:
+            result.append((s, POLLOUT))
+        return result
+
+def remove(list, item):
+    i = bisect(list, item)
+    if i > 0 and list[i-1] == item:
+        del list[i-1]
+
+def insert(list, item):
+    i = bisect(list, item)
+    if i == 0 or list[i-1] != item:
+        list.insert(i, item)