asr.c

xenomai 很好的linux实时补丁

/*
 * Copyright (C) 2001,2002,2003 Philippe Gerum <[e-mail]>.
 *
 * Xenomai 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; either version 2 of the License,
 * or (at your option) any later version.
 *
 * Xenomai 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 Xenomai; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 */

#include "psos+/task.h"
#include "psos+/asr.h"

void psosasr_init (void) {
}

void psosasr_cleanup (void) {
}

u_long as_catch (void (*routine)(void),
		 u_long mode)
{
    spl_t s;

    xnpod_check_context(XNPOD_THREAD_CONTEXT);

    xnlock_get_irqsave(&nklock,s);
    psos_current_task()->threadbase.asr = (xnasr_t)routine;
    psos_current_task()->threadbase.asrmode = psos_mode_to_xeno(mode);
    psos_current_task()->threadbase.asrimask = ((mode >> 8) & 0x7);
    xnlock_put_irqrestore(&nklock,s);

    /* The rescheduling procedure checks for pending signals. */
    xnpod_schedule();

    return SUCCESS;
}

u_long as_send (u_long tid,
		u_long signals)
{
    u_long err = SUCCESS;
    psostask_t *task;
    spl_t s;

    xnlock_get_irqsave(&nklock,s);

    task = psos_h2obj_active(tid,PSOS_TASK_MAGIC,psostask_t);

    if (!task)
	{
	err = psos_handle_error(tid,PSOS_TASK_MAGIC,psostask_t);
	goto unlock_and_exit;
	}

    if (task->threadbase.asr == XNTHREAD_INVALID_ASR)
	{
	err = ERR_NOASR;
	goto unlock_and_exit;
	}

    if (signals > 0)
	{
	task->threadbase.signals |= signals;

	if (xnpod_current_thread() == &task->threadbase)
	    xnpod_schedule();
	}

 unlock_and_exit:

    xnlock_put_irqrestore(&nklock,s);

    return err;
}