releasing file descriptors with the tty layer

[Mike Frysinger]

if you have a multithreaded application and more than one thread is
operating on a file descriptor which represents a tty device at the
same time (one is used to polling it while another is used to interact
with it via read/write), doing a close() operation on the file will
not actually release the file descriptor in the kernel until all
things referencing it have completed (like the select()) ?

for example, say a background thread is doing select() on the fd while
another thread does close() followed by open() ... it is possible for
the close()/open() sequence on the tty to complete before the select()
is signaled and finishes ? so in the tty layer, you'd see tty_open
called (via the open()) before tty_close (via the close() and the
select()) ?
-mike

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