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Make select wait state more readable 

Rename "res" to "wait_state" and change its type to
	select_stuff::wait_states.  Use select_stuff::wait_states
	values instead of ints throughout. 	Rearrange a few comments.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen 2016-01-25 21:00:14 +01:00
parent 11a37290c6
commit d9accb0079
1 changed files with 19 additions and 15 deletions
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34
winsup/cygwin/select.cc
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@ -129,7 +129,7 @@ static int
select (int maxfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
DWORD ms)
{
int res = select_stuff::select_loop;
select_stuff::wait_states wait_state = select_stuff::select_loop;
int ret = 0;
/* Record the current time for later use. */
@ -167,29 +167,32 @@ select (int maxfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
call_signal_handler(). */
_my_tls.call_signal_handler ();
set_sig_errno (EINTR);
res = select_stuff::select_signalled;
wait_state = select_stuff::select_signalled;
break;
case WAIT_CANCELED:
sel.destroy ();
pthread::static_cancel_self ();
/*NOTREACHED*/
default:
res = select_stuff::select_set_zero; /* Set res to zero below. */
/* Set wait_state to zero below. */
wait_state = select_stuff::select_set_zero;
break;
}
else if (sel.always_ready || ms == 0)
res = 0; /* Catch any active fds via
sel.poll() below */
/* Catch any active fds via sel.poll() below */
wait_state = select_stuff::select_ok;
else
res = sel.wait (r, w, e, ms); /* wait for an fd to become
become active or time out */
select_printf ("res %d", res);
if (res >= 0)
/* wait for an fd to become active or time out */
wait_state = sel.wait (r, w, e, ms);
select_printf ("sel.wait returns %d", wait_state);
if (wait_state >= select_stuff::select_ok)
{
UNIX_FD_ZERO (readfds, maxfds);
UNIX_FD_ZERO (writefds, maxfds);
UNIX_FD_ZERO (exceptfds, maxfds);
if (res == select_stuff::select_set_zero)
if (wait_state == select_stuff::select_set_zero)
ret = 0;
else
{
@ -198,7 +201,7 @@ select (int maxfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
fds records. if ret is 0, continue to loop. */
ret = sel.poll (readfds, writefds, exceptfds);
if (!ret)
res = select_stuff::select_loop;
wait_state = select_stuff::select_loop;
}
}
/* Always clean up everything here. If we're looping then build it
@ -206,7 +209,7 @@ select (int maxfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
sel.cleanup ();
sel.destroy ();
/* Recalculate time remaining to wait if we are going to be looping. */
if (res == select_stuff::select_loop && ms != INFINITE)
if (wait_state == select_stuff::select_loop && ms != INFINITE)
{
select_printf ("recalculating ms");
LONGLONG now = gtod.msecs ();
@ -217,7 +220,8 @@ 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);
ret = res = 0;
wait_state = select_stuff::select_ok;
ret = 0;
}
else
{
@ -227,9 +231,9 @@ select (int maxfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
}
}
}
while (res == select_stuff::select_loop);
while (wait_state == select_stuff::select_loop);
if (res < 0)
if (wait_state < select_stuff::select_ok)
ret = -1;
return ret;
}