poll the inputs, but don't wait if there is nothing available
immediately. Check to make sure that the LIMIT_DATE hasn't already
past; if it has, return immediately, before polling input sources.
git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@1220 72102866-910b-0410-8b05-ffd578937521
([RunLoop -init]): Initialize new ivars.
([RunLoop -currentMode]): New method.
([RunLoop -addFileDescriptor:object:forMode:]): Method replaces
-addFileDescriptor:invocation:forMode:, and re-implemented. Not yet
functional.
([RunLoop -removeFileDescriptor:forMode:]): Likewise.
([RunLoop -addPort:forMode:]): New method.
([RunLoop -removePort:forMode:]): New method.
([RunLoop -addTimer:forMode:]): Overhauled to do the right thing with
the MODE argument.
([RunLoop -acceptInputForMode:beforeDate:]): Method overhauled to ask
port objects for their FD's, create FD_2_OBJECT map table on the fly,
and initialize FDS on the fly. Now properly removed invalidated ports
from the MODE.
([RunLoop -runOnceBeforeDate:forMode:]): New method.
([RunLoop -runOnceBeforeDate:]): New method.
([RunLoop -runUntilDate:forMode:]): New method.
([RunLoop -runUntilDate:]): New method.
([RunLoop +runUntilDate:forMode:]): New method.
([RunLoop +runOnceBeforeDate:]): New method.
([RunLoop +runOnceBeforeDate:forMode:]): New method.
([RunLoop +currentMode]): New method.
(RunLoopDefaultMode): New global variable.
([NSObject -performSelector:afterDelay:]): Not implemented.
git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@1187 72102866-910b-0410-8b05-ffd578937521
