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author | Zac Medico <zmedico@gentoo.org> | 2009-06-22 16:43:52 +0000 |
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committer | Zac Medico <zmedico@gentoo.org> | 2009-06-22 16:43:52 +0000 |
commit | d057d91f391981fb0564873c471d550f2f62edf5 (patch) | |
tree | d6cd416fc5e9389806ec98a02ae236c99e876e4b /pym/_emerge/PollSelectAdapter.py | |
parent | 28184c982a0688ed9bc4d82df407d4e400f6318c (diff) | |
download | portage-d057d91f391981fb0564873c471d550f2f62edf5.tar.gz portage-d057d91f391981fb0564873c471d550f2f62edf5.tar.bz2 portage-d057d91f391981fb0564873c471d550f2f62edf5.zip |
Bug #275047 - Split _emerge/__init__.py into smaller pieces. Thanks to
Sebastian Mingramm (few) <s.mingramm@gmx.de> for this patch.
svn path=/main/trunk/; revision=13663
Diffstat (limited to 'pym/_emerge/PollSelectAdapter.py')
-rw-r--r-- | pym/_emerge/PollSelectAdapter.py | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/pym/_emerge/PollSelectAdapter.py b/pym/_emerge/PollSelectAdapter.py new file mode 100644 index 000000000..d3b9da990 --- /dev/null +++ b/pym/_emerge/PollSelectAdapter.py @@ -0,0 +1,70 @@ +from _emerge.PollConstants import PollConstants +import select +class PollSelectAdapter(PollConstants): + + """ + Use select to emulate a poll object, for + systems that don't support poll(). + """ + + def __init__(self): + self._registered = {} + self._select_args = [[], [], []] + + def register(self, fd, *args): + """ + Only POLLIN is currently supported! + """ + if len(args) > 1: + raise TypeError( + "register expected at most 2 arguments, got " + \ + repr(1 + len(args))) + + eventmask = PollConstants.POLLIN | \ + PollConstants.POLLPRI | PollConstants.POLLOUT + if args: + eventmask = args[0] + + self._registered[fd] = eventmask + self._select_args = None + + def unregister(self, fd): + self._select_args = None + del self._registered[fd] + + def poll(self, *args): + if len(args) > 1: + raise TypeError( + "poll expected at most 2 arguments, got " + \ + repr(1 + len(args))) + + timeout = None + if args: + timeout = args[0] + + select_args = self._select_args + if select_args is None: + select_args = [self._registered.keys(), [], []] + + if timeout is not None: + select_args = select_args[:] + # Translate poll() timeout args to select() timeout args: + # + # | units | value(s) for indefinite block + # ---------|--------------|------------------------------ + # poll | milliseconds | omitted, negative, or None + # ---------|--------------|------------------------------ + # select | seconds | omitted + # ---------|--------------|------------------------------ + + if timeout is not None and timeout < 0: + timeout = None + if timeout is not None: + select_args.append(timeout / 1000) + + select_events = select.select(*select_args) + poll_events = [] + for fd in select_events[0]: + poll_events.append((fd, PollConstants.POLLIN)) + return poll_events + |