mirror of https://github.com/dzavalishin/oskit/
100 lines
2.5 KiB
C
100 lines
2.5 KiB
C
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/*
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* Copyright (c) 1996, 1998, 2000 University of Utah and the Flux Group.
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* All rights reserved.
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*
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* This file is part of the Flux OSKit. The OSKit is free software, also known
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* as "open source;" you can redistribute it and/or modify it under the terms
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* of the GNU General Public License (GPL), version 2, as published by the Free
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* Software Foundation (FSF). To explore alternate licensing terms, contact
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* the University of Utah at csl-dist@cs.utah.edu or +1-801-585-3271.
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*
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* The OSKit is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GPL for more details. You should have
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* received a copy of the GPL along with the OSKit; see the file COPYING. If
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* not, write to the FSF, 59 Temple Place #330, Boston, MA 02111-1307, USA.
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*/
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/*
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* Default implementation of osenv_sleep and friends.
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*/
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#include <oskit/debug.h>
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#include <oskit/dev/dev.h>
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void
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osenv_sleep_init(osenv_sleeprec_t *sr)
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{
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osenv_assert(sr);
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sr->data[0] = OSENV_SLEEP_WAKEUP; /* Return code for osenv_sleep() */
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sr->data[1] = sr; /* Just a flag; anything non-null will do */
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}
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int
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osenv_sleep(osenv_sleeprec_t *sr)
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{
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volatile osenv_sleeprec_t *vsr = sr;
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int was_enabled = osenv_intr_enabled();
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osenv_assert(sr);
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/* We won't get anywhere if interrupts aren't enabled! */
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if (!was_enabled)
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osenv_intr_enable();
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/* Busy-wait until osenv_wakeup() clears the flag in the sleeprec */
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while (vsr->data[1])
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/* NOTHING */;
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/* Restore the original interrupt enable state */
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if (!was_enabled)
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osenv_intr_disable();
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return (int) vsr->data[0];
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}
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void
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osenv_wakeup(osenv_sleeprec_t *sr, int wakeup_status)
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{
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osenv_assert(sr);
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sr->data[0] = (void *)wakeup_status;
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sr->data[1] = (void *)0;
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}
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/*
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* Process locks - the delightfully easy single-threaded version.
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*
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* This is in this file because it is a massive mistake to use mismatched
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* versions of sleep and process_lock and we don't really trust the linker.
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*
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* We do not implement osenv_process_lock_check or osenv_process_lock_locked
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* because they are not used anywhere and aren't mentioned in the
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* documentation.
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*/
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/*
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* Lock the process lock.
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*/
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void
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osenv_process_lock(void)
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{
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}
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/*
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* Unlock the process lock.
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*/
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void
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osenv_process_unlock(void)
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{
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}
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/*
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* Test if the current thread has the process lock. Kludge for usermode.
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*/
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int
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osenv_process_locked(void)
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{
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/* We _always_ have the lock in single-threaded code. */
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return 1;
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}
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