a2e62f557d
sched/init/nx_bringup.c: Fix a naming collision.
sched/init: Rename os_start() to nx_start()
sched/init: Rename os_smp* to nx_smp*
sched/init: Rename os_bringup to nx_bringup
sched/init: rename all internal static functions to begin with nx_ vs os_
100 lines
3.8 KiB
C
100 lines
3.8 KiB
C
/****************************************************************************
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* sched/sched/sched_idletask.c
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*
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* Copyright (C) 2016 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 <nuttx/init.h>
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#include <nuttx/sched.h>
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#include "sched/sched.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: sched_idletask
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*
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* Description:
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* Check if the caller is an IDLE thread. For most implementations of
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* the SYSLOG output semaphore locking is required for mutual exclusion.
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* The idle threads are unable to lock semaphores because they cannot
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* want. So IDLE thread output is a special case and is treated much as
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* we treat debug output from an interrupt handler.
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* true if the calling task is and IDLE thread.
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*
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****************************************************************************/
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bool sched_idletask(void)
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{
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FAR struct tcb_s *rtcb = this_task();
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/* If called early in the initialization sequence, the tasks lists may not
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* have been initialized and, in that case, rtcb may be NULL.
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*/
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DEBUGASSERT(rtcb != NULL || g_nx_initstate < OSINIT_TASKLISTS);
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if (rtcb != NULL)
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{
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/* The IDLE task TCB is distinguishable by a few things:
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*
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* (1) It always lies at the end of the task list,
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* (2) It always has priority zero, and
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* (3) It should have the TCB_FLAG_CPU_LOCKED flag set.
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*
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* In the non-SMP case, the IDLE task will also have PID=0, but that
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* is not a portable test because there are multiple IDLE tasks with
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* different PIDs in the SMP configuration.
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*/
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return (rtcb->flink == NULL);
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}
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/* We must be on the IDLE thread if we are early in initialization */
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return true;
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}
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