108 lines
3.7 KiB
C
108 lines
3.7 KiB
C
/****************************************************************************
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* sched/sched/sched_suspend.c
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*
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* Copyright (C) 2018 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 <sys/types.h>
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#include <sched.h>
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#include <assert.h>
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#include <nuttx/irq.h>
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#include <nuttx/sched.h>
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#include <nuttx/arch.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_suspend
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*
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* Description:
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* Suspend/pause the specified thread. This is normally calling indirectly
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* via group_suspendchildren();
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*
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****************************************************************************/
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void sched_suspend(FAR struct tcb_s *tcb)
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{
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irqstate_t flags;
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DEBUGASSERT(tcb != NULL);
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flags = enter_critical_section();
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/* Check the current state of the task */
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if (tcb->task_state >= FIRST_BLOCKED_STATE &&
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tcb->task_state <= LAST_BLOCKED_STATE)
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{
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/* Remove the TCB from the the blocked task list. */
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sched_removeblocked(tcb);
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/* Set the errno value to EINTR. The task will be restarted in the
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* running or runnable state and will appear to have awakened from
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* the block state by a signal.
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*/
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tcb->pterrno = EINTR;
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/* Move the TCB to the g_stoppedtasks list. */
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sched_addblocked(tcb, TSTATE_TASK_STOPPED);
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}
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else
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{
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/* The task was running or runnable before being stopped. Simply
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* block it in the stopped state. If tcb refers to this task, then
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* this action will block this task.
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* Before doing that make sure this is not the idle task,
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* descheduling that isn't going to end well.
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*/
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DEBUGASSERT(NULL != tcb->flink);
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up_block_task(tcb, TSTATE_TASK_STOPPED);
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}
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leave_critical_section(flags);
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}
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