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/************************************************************
* up_releasepending.c
*
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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. Neither the name Gregory Nutt nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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 THE
* COPYRIGHT OWNER OR CONTRIBUTORS 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.
*
************************************************************/
/************************************************************
* Included Files
************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <sched.h>
#include <debug.h>
#include <nuttx/arch.h>
#include "os_internal.h"
#include "up_internal.h"
/************************************************************
* Private Definitions
************************************************************/
/************************************************************
* Private Data
************************************************************/
/************************************************************
* Private Funtions
************************************************************/
/************************************************************
* Public Funtions
************************************************************/
/************************************************************
* Name: up_release_pending
*
* Description:
* Release and ready-to-run tasks that have
* collected in the pending task list. This can call a
* context switch if a new task is placed at the head of
* the ready to run list.
*
************************************************************/
void up_release_pending(void)
{
_TCB *rtcb = (_TCB*)g_readytorun.head;
dbg("From TCB=%p\n", rtcb);
/* Merge the g_pendingtasks list into the g_readytorun task list */
/* sched_lock(); */
if (sched_mergepending())
{
/* The currently active task has changed! Copy the exception context
* into the TCB of the task that was currently active. if up_setjmp
* returns a non-zero value, then this is really the previously
* running task restarting!
*/
if (!up_setjmp(rtcb->xcp.regs))
{
/* Restore the exception context of the rtcb at the (new) head
* of the g_readytorun task list.
*/
rtcb = (_TCB*)g_readytorun.head;
dbg("New Active Task TCB=%p\n", rtcb);
/* The way that we handle signals in the simulation is kind of
* a kludge. This would be unsafe in a truly multi-threaded, interrupt
* driven environment.
*/
if (rtcb->xcp.sigdeliver)
{
dbg("Delivering signals TCB=%p\n", rtcb);
((sig_deliver_t)rtcb->xcp.sigdeliver)(rtcb);
rtcb->xcp.sigdeliver = NULL;
}
/* Then switch contexts */
up_longjmp(rtcb->xcp.regs, 1);
}
}
}
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