Initial import of Brookhaven site

tapdown/lib/python3.11/site-packages/eventlet/hubs/selects.py

@@ -0,0 +1,63 @@
+import errno
+import sys
+from eventlet import patcher, support
+from eventlet.hubs import hub
+select = patcher.original('select')
+time = patcher.original('time')
+
+try:
+    BAD_SOCK = {errno.EBADF, errno.WSAENOTSOCK}
+except AttributeError:
+    BAD_SOCK = {errno.EBADF}
+
+
+def is_available():
+    return hasattr(select, 'select')
+
+
+class Hub(hub.BaseHub):
+    def _remove_bad_fds(self):
+        """ Iterate through fds, removing the ones that are bad per the
+        operating system.
+        """
+        all_fds = list(self.listeners[self.READ]) + list(self.listeners[self.WRITE])
+        for fd in all_fds:
+            try:
+                select.select([fd], [], [], 0)
+            except OSError as e:
+                if support.get_errno(e) in BAD_SOCK:
+                    self.remove_descriptor(fd)
+
+    def wait(self, seconds=None):
+        readers = self.listeners[self.READ]
+        writers = self.listeners[self.WRITE]
+        if not readers and not writers:
+            if seconds:
+                time.sleep(seconds)
+            return
+        reader_fds = list(readers)
+        writer_fds = list(writers)
+        all_fds = reader_fds + writer_fds
+        try:
+            r, w, er = select.select(reader_fds, writer_fds, all_fds, seconds)
+        except OSError as e:
+            if support.get_errno(e) == errno.EINTR:
+                return
+            elif support.get_errno(e) in BAD_SOCK:
+                self._remove_bad_fds()
+                return
+            else:
+                raise
+
+        for fileno in er:
+            readers.get(fileno, hub.noop).cb(fileno)
+            writers.get(fileno, hub.noop).cb(fileno)
+
+        for listeners, events in ((readers, r), (writers, w)):
+            for fileno in events:
+                try:
+                    listeners.get(fileno, hub.noop).cb(fileno)
+                except self.SYSTEM_EXCEPTIONS:
+                    raise
+                except:
+                    self.squelch_exception(fileno, sys.exc_info())