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select(2): Drop checking descriptors in case of immediate timeout.

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* select.cc (select): Call sel.poll only if sel.wait returned
	select_ok.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen 2016-01-11 10:36:33 +01:00
parent e3b230b043
commit 20ddde2f55
1 changed files with 11 additions and 6 deletions
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17
winsup/cygwin/select.cc
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@ -189,12 +189,17 @@ select (int maxfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
UNIX_FD_ZERO (readfds, maxfds);
UNIX_FD_ZERO (writefds, maxfds);
UNIX_FD_ZERO (exceptfds, maxfds);
/* Set bit mask from sel records even in case of a timeout so we
don't miss one. This also sets ret to the right value >= 0,
matching the number of bits set in the fds records. */
ret = sel.poll (readfds, writefds, exceptfds);
if (!ret && res != select_stuff::select_set_zero)
res = select_stuff::select_loop;
if (res == select_stuff::select_set_zero)
ret = 0;
else
{
/* Set bit mask from sel records. This also sets ret to the
right value >= 0, matching the number of bits set in the
fds records. if ret is 0, continue to loop. */
ret = sel.poll (readfds, writefds, exceptfds);
if (!ret)
res = select_stuff::select_loop;
}
}
/* Always clean up everything here. If we're looping then build it
all up again. */