b08a86171f
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3 42af7a65-404d-4744-a932-0658087f49c3
112 lines
3.7 KiB
C
112 lines
3.7 KiB
C
/************************************************************
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* up_exit.c
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*
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* Copyright (C) 2007 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 Gregory Nutt 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 <sys/types.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: _exit
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*
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* Description:
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* This function causes the currently executing task to cease
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* to exist. This is a special case of task_delete().
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*
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************************************************************/
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void _exit(int status)
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{
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_TCB* tcb = (_TCB*)g_readytorun.head;
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dbg("TCB=%p exitting\n", tcb);
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/* Remove the tcb task from the ready-to-run list. We can
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* ignore the return value because we know that a context
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* switch is needed.
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*/
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(void)sched_removereadytorun(tcb);
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/* Move the TCB to the specified blocked task list and delete it */
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sched_addblocked(tcb, TSTATE_TASK_INACTIVE);
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task_delete(tcb->pid);
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/* If there are any pending tasks, then add them to the g_readytorun
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* task list now
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*/
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if (g_pendingtasks.head)
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{
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(void)sched_mergepending();
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}
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/* Now, perform the context switch to the new ready-to-run task at the
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* head of the list.
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*/
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tcb = (_TCB*)g_readytorun.head;
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dbg("New Active Task TCB=%p\n", tcb);
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/* Then switch contexts */
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up_fullcontextrestore(tcb->xcp.regs);
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}
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