95 lines
3.2 KiB
C
95 lines
3.2 KiB
C
/****************************************************************************
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* sched/task/task_activate.c
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*
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* Copyright (C) 2007-2009, 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 <sched.h>
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#include <debug.h>
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#include <nuttx/irq.h>
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#include <nuttx/arch.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: task_activate
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*
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* Description:
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* This function activates tasks initialized by task_schedsetup(). Without
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* activation, a task is ineligible for execution by the scheduler.
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*
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* Input Parameters:
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* tcb - The TCB for the task for the task (same as the task_init argument).
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*
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* Return Value:
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* Always returns OK
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*
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****************************************************************************/
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int task_activate(FAR struct tcb_s *tcb)
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{
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irqstate_t flags = enter_critical_section();
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#ifdef CONFIG_SCHED_INSTRUMENTATION
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/* Check if this is really a re-start */
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if (tcb->task_state != TSTATE_TASK_INACTIVE)
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{
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/* Inform the instrumentation layer that the task
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* has stopped
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*/
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sched_note_stop(tcb);
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}
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/* Inform the instrumentation layer that the task
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* has started
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*/
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sched_note_start(tcb);
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#endif
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up_unblock_task(tcb);
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leave_critical_section(flags);
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return OK;
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}
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