NetBSD/lib/libpthread/arch/i386/machdep.c

137 lines
4.8 KiB
C

/* ==== machdep.c ============================================================
* Copyright (c) 1993, 1994 Chris Provenzano, proven@athena.mit.edu
*
* Copyright (c) 1993 by Chris Provenzano, proven@mit.edu
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Chris Provenzano.
* 4. The name of Chris Provenzano may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY CHRIS PROVENZANO ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL CHRIS PROVENZANO BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Description : Machine dependent functions for NetBSD on i386
*
* 1.00 93/08/04 proven
* -Started coding this file.
*/
#ifndef lint
static const char rcsid[] = "$Id: machdep.c,v 1.3 1994/02/07 22:00:44 proven Exp $";
#endif
#include "pthread.h"
/* ==========================================================================
* machdep_save_state()
*/
int machdep_save_state(void)
{
return(_setjmp(pthread_run->machdep_data.machdep_state));
}
/* ==========================================================================
* machdep_restore_state()
*/
void machdep_restore_state(void)
{
_longjmp(pthread_run->machdep_data.machdep_state, 1);
}
/* ==========================================================================
* machdep_set_thread_timer()
*/
void machdep_set_thread_timer(struct machdep_pthread *machdep_pthread)
{
if (setitimer(ITIMER_VIRTUAL, &(machdep_pthread->machdep_timer), NULL)) {
PANIC();
}
}
/* ==========================================================================
* machdep_unset_thread_timer()
*/
void machdep_unset_thread_timer(struct machdep_pthread *machdep_pthread)
{
struct itimerval zeroval = { { 0, 0 }, { 0, 0} };
if (setitimer(ITIMER_VIRTUAL, &zeroval, NULL)) {
PANIC();
}
}
/* ==========================================================================
* machdep_pthread_cleanup()
*/
void *machdep_pthread_cleanup(struct machdep_pthread *machdep_pthread)
{
return(machdep_pthread->machdep_stack);
}
/* ==========================================================================
* machdep_pthread_start()
*/
void machdep_pthread_start(void)
{
context_switch_done();
sig_check_and_resume();
/* Run current threads start routine with argument */
pthread_exit(pthread_run->machdep_data.start_routine
(pthread_run->machdep_data.start_argument));
/* should never reach here */
PANIC();
}
/* ==========================================================================
* machdep_pthread_create()
*/
void machdep_pthread_create(struct machdep_pthread *machdep_pthread,
void *(* start_routine)(), void *start_argument, long stack_size,
void *stack_start, long nsec)
{
machdep_pthread->machdep_stack = stack_start;
machdep_pthread->start_routine = start_routine;
machdep_pthread->start_argument = start_argument;
machdep_pthread->machdep_timer.it_value.tv_sec = 0;
machdep_pthread->machdep_timer.it_interval.tv_sec = 0;
machdep_pthread->machdep_timer.it_interval.tv_usec = 0;
machdep_pthread->machdep_timer.it_value.tv_usec = nsec / 1000;
_setjmp(machdep_pthread->machdep_state);
/*
* Set up new stact frame so that it looks like it
* returned from a longjmp() to the beginning of
* machdep_pthread_start().
*/
machdep_pthread->machdep_state[0] = (int)machdep_pthread_start;
/* Stack starts high and builds down. */
machdep_pthread->machdep_state[2] =
(int)machdep_pthread->machdep_stack + stack_size;
}