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/*
* fiber_unix.c
*
* $Id$
*
* Fiber Event Loop (Unix implementation)
*
* This file is part of the OpenLink Software Virtuoso Open-Source (VOS)
* project.
*
* Copyright (C) 1998-2012 OpenLink Software
*
* This project is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; only version 2 of the License, dated June 1991.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*
*/
#include "thread_int.h"
#ifdef EXPIRIMENTAL
int
thread_select (int n, fd_set *rfds, fd_set *wfds, void *event, TVAL timeout)
{
thread_t *thr = _current_fiber;
if (rfds)
thr->thr_rfds = *rfds;
else
FD_ZERO (&thr->thr_rfds);
if (wfds)
thr->thr_wfds = *wfds;
else
FD_ZERO (&thr->thr_wfds);
thr->thr_nfds = n;
/* Signalled in _fiber_event_loop () */
if (_fiber_sleep (event, timeout) == -1)
{
thr->thr_nfds = 0;
return 0;
}
thr->thr_nfds = 0;
if (rfds)
*rfds = thr->thr_rfds;
if (wfds)
*wfds = thr->thr_wfds;
return thr->thr_retcode;
}
void
thread_sleep (TVAL timeout)
{
_fiber_sleep (NULL, timeout);
thr_errno = 0;
}
static int
_fd_set_or (fd_set * s1, fd_set * s2)
{
uint32 *p1 = (uint32 *) s1;
uint32 *p2 = (uint32 *) s2;
uint32 n;
int res;
res = 0;
for (n = 0; n < sizeof (fd_set) / sizeof (uint32); n++)
if (p1[n] |= p2[n])
res = (n + 1) * 32;
return res;
}
static int
_fd_set_intersect (fd_set * s1, fd_set * s2)
{
uint32 *p1 = (uint32 *) s1;
uint32 *p2 = (uint32 *) s2;
uint32 n;
for (n = 0; n < sizeof (fd_set) / sizeof (uint32); n++)
if (p1[n] & p2[n])
return 1;
return 0;
}
static int
_fd_set_and (fd_set * s1, fd_set * s2)
{
uint32 *p1 = (uint32 *) s1;
uint32 *p2 = (uint32 *) s2;
uint32 n;
int ok;
ok = 0;
for (n = 0; n < sizeof (fd_set) / sizeof (uint32); n++)
if ((p1[n] &= p2[n]) != 0)
ok = 1;
return ok;
}
#ifdef DEBUG
static void
dumpfds (char *lbl, int n, fd_set *p)
{
int i;
fprintf (stderr, "%s:", lbl);
for (i = 0; i < n; i++)
{
if (FD_ISSET (i, p))
fprintf (stderr, " %d", i);
}
fprintf (stderr, "\n");
}
#endif
/*
* This is the idle task, that runs at the lowest possible priority.
* It's only called when there are no other fibers ready for scheduling.
*/
void
_fiber_event_loop (void)
{
/* These are all static, to minimize stack usage */
static fd_set readfds;
static fd_set writefds;
static int nreadfds;
static int nwritefds;
static int nfds;
static thread_t *thr, *next;
static TVAL timeout;
static struct timeval tv, *ptv;
static int rc;
for (;;)
{
timeout = timer_queue_update (_timerq,
timer_queue_time_elapsed (_timerq));
if (_thread_num_runnable)
return;
FD_ZERO (&readfds);
FD_ZERO (&writefds);
for (thr = (thread_t *) _waitq.thq_head.thr_next;
thr != (thread_t *) &_waitq.thq_head;
thr = (thread_t *) thr->thr_hdr.thr_next)
{
if (thr->thr_nfds)
{
nreadfds = _fd_set_or (&readfds, &thr->thr_rfds);
nwritefds = _fd_set_or (&writefds, &thr->thr_wfds);
}
}
nfds = MAX (nreadfds, nwritefds);
if (timeout == 0)
ptv = NULL;
else
{
tv.tv_sec = timeout / 1000;
tv.tv_usec = (timeout % 1000) * 1000;
ptv = &tv;
}
rc = select (nfds, &readfds, &writefds, NULL, ptv);
if (rc == -1)
{
if (errno != EINTR)
GPF_T1 ("select() returned -1");
continue;
}
timer_queue_update (_timerq, timer_queue_time_elapsed (_timerq));
if (rc > 0)
{
/* Wake up waiting fibers for which an event occurred */
for (thr = (thread_t *) _waitq.thq_head.thr_next;
thr != (thread_t *) &_waitq.thq_head;
thr = next)
{
next = (thread_t *) thr->thr_hdr.thr_next;
if (thr->thr_nfds == 0)
continue;
if (_fd_set_intersect (&thr->thr_rfds, &readfds) ||
_fd_set_intersect (&thr->thr_wfds, &writefds))
{
_fd_set_and (&thr->thr_rfds, &readfds);
_fd_set_and (&thr->thr_wfds, &writefds);
thr->thr_event = NULL;
thr->thr_retcode = 1;
_fiber_status (thr, RUNNABLE);
}
}
}
break;
}
}
#endif
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