3340acc7ae
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2358 42af7a65-404d-4744-a932-0658087f49c3
136 lines
4.7 KiB
C
136 lines
4.7 KiB
C
/************************************************************************
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* up_releasepending.c
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*
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* Copyright (C) 2007, 2009 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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************************************************************************/
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/************************************************************************
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* Included Files
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************************************************************************/
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#include <nuttx/config.h>
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#include <sched.h>
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#include <debug.h>
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#include <nuttx/arch.h>
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#include "os_internal.h"
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#include "up_internal.h"
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/************************************************************************
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* Private Definitions
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************************************************************************/
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/************************************************************************
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* Private Data
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************************************************************************/
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/************************************************************************
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* Private Funtions
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************************************************************************/
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/************************************************************************
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* Public Funtions
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************************************************************************/
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/************************************************************************
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* Name: up_release_pending
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*
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* Description:
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* Release and ready-to-run tasks that have
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* collected in the pending task list. This can call a
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* context switch if a new task is placed at the head of
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* the ready to run list.
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*
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************************************************************************/
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void up_release_pending(void)
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{
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FAR _TCB *rtcb = (FAR _TCB*)g_readytorun.head;
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dbg("From TCB=%p\n", rtcb);
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/* Merge the g_pendingtasks list into the g_readytorun task list */
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/* sched_lock(); */
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if (sched_mergepending())
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{
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/* The currently active task has changed! We will need to
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* switch contexts. First check if we are operating in
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* interrupt context:
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*/
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if (g_irqtos)
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{
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/* Yes, then we have to do things differently.
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* Just copy the current registers into the OLD rtcb.
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*/
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up_saveirqcontext(&rtcb->xcp);
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/* Restore the exception context of the rtcb at the (new) head
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* of the g_readytorun task list.
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*/
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rtcb = (FAR _TCB*)g_readytorun.head;
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dbg("New Active Task TCB=%p\n", rtcb);
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/* Then setup so that the context will be performed on exit
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* from the interrupt.
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*/
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g_irqcontext = &rtcb->xcp;
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}
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/* Copy the exception context into the TCB of the task that
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* was currently active. if up_savecontext returns a non-zero
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* value, then this is really the previously running task
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* restarting!
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*/
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else if (!up_savecontext(&rtcb->xcp))
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{
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/* Restore the exception context of the rtcb at the (new) head
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* of the g_readytorun task list.
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*/
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rtcb = (FAR _TCB*)g_readytorun.head;
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dbg("New Active Task TCB=%p\n", rtcb);
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/* Then switch contexts */
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up_restorecontext(&rtcb->xcp);
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}
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}
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}
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