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121 lines
4.5 KiB
121 lines
4.5 KiB
/**************************************************************************** |
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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 calling this |
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* function (calling sched_lock() first is NOT 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 to run list. |
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* In this case, we are removing the currently 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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