124 lines
4.6 KiB
C
124 lines
4.6 KiB
C
/****************************************************************************
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* shced/sched_removereadytorun.c
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*
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* Copyright (C) 2007-2009, 2012 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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 <stdbool.h>
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#include <queue.h>
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#include <assert.h>
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#include "os_internal.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Type Declarations
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****************************************************************************/
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/****************************************************************************
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* Global Variables
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****************************************************************************/
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/****************************************************************************
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* Private Variables
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****************************************************************************/
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: sched_removereadytorun
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*
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* Description:
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* This function removes a TCB from the ready to run list.
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*
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* Inputs:
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* rtcb - Points to the TCB that is ready-to-run
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*
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* Return Value:
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* true if the currently active task (the head of the
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* g_readytorun list) has changed.
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*
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* Assumptions:
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* - The caller has established a critical section before
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* calling this function (calling sched_lock() first is NOT
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* a good idea -- use irqsave()).
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* - The caller handles the condition that occurs if the
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* the head of the g_readytorun list is changed.
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*
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****************************************************************************/
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bool sched_removereadytorun(FAR _TCB *rtcb)
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{
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bool ret = false;
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/* Check if the TCB to be removed is at the head of the ready
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* to run list. In this case, we are removing the currently
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* active task.
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*/
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if (!rtcb->blink)
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{
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/* There must always be at least one task in the list (the idle task) */
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ASSERT(rtcb->flink != NULL);
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/* Inform the instrumentation layer that we are switching tasks */
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sched_note_switch(rtcb, rtcb->flink);
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rtcb->flink->task_state = TSTATE_TASK_RUNNING;
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ret = true;
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}
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/* Remove the TCB from the ready-to-run list */
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dq_rem((FAR dq_entry_t*)rtcb, (dq_queue_t*)&g_readytorun);
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rtcb->task_state = TSTATE_TASK_INVALID;
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return ret;
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}
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