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/*
* Copyright (c) 1996, 1998 University of Utah and the Flux Group.
* All rights reserved.
*
* This file is part of the Flux OSKit. The OSKit is free software, also known
* as "open source;" you can redistribute it and/or modify it under the terms
* of the GNU General Public License (GPL), version 2, as published by the Free
* Software Foundation (FSF). To explore alternate licensing terms, contact
* the University of Utah at csl-dist@cs.utah.edu or +1-801-585-3271.
*
* The OSKit 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 GPL for more details. You should have
* received a copy of the GPL along with the OSKit; see the file COPYING. If
* not, write to the FSF, 59 Temple Place #330, Boston, MA 02111-1307, USA.
*/
/*
* Default implementation of osenv_sleep and friends.
*/
#include <oskit/debug.h>
#include <oskit/dev/dev.h>
void
osenv_sleep_init(osenv_sleeprec_t *sr)
{
osenv_assert(sr);
sr->data[0] = OSENV_SLEEP_WAKEUP; /* Return code for osenv_sleep() */
sr->data[1] = sr; /* Just a flag; anything non-null will do */
}
int
osenv_sleep(osenv_sleeprec_t *sr)
{
volatile osenv_sleeprec_t *vsr = sr;
int was_enabled = osenv_intr_enabled();
osenv_assert(sr);
/* We won't get anywhere if interrupts aren't enabled! */
osenv_intr_enable();
/* Busy-wait until osenv_wakeup() clears the flag in the sleeprec */
while (vsr->data[1])
/* NOTHING */;
/* Restore the original interrupt enable state */
if (!was_enabled)
osenv_intr_disable();
return (int) vsr->data[0];
}
void
osenv_wakeup(osenv_sleeprec_t *sr, int wakeup_status)
{
osenv_assert(sr);
sr->data[0] = (void *)wakeup_status;
sr->data[1] = (void *)0;
}
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