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184 lines
6.1 KiB
184 lines
6.1 KiB
/**************************************************************************** |
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* sched/task_restart.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 <sys/types.h> |
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#include <sched.h> |
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#include <nuttx/arch.h> |
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#include "os_internal.h" |
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#include "sig_internal.h" |
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/**************************************************************************** |
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* 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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* Private Functions |
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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: task_restart |
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* |
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* Description: |
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* This function "restarts" a task. The task is first terminated and then |
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* reinitialized with same ID, priority, original entry point, stack size, |
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* and parameters it had when it was first started. |
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* |
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* Inputs: |
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* pid - The task ID of the task to delete. An ID of zero signifies the |
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* calling task. |
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* |
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* Return Value: |
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* OK on sucess; ERROR on failure. |
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* |
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* This function can fail if: |
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* (1) A pid of zero or the pid of the calling task is provided |
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* (functionality not implemented) |
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* (2) The pid is not associated with any task known to the system. |
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* |
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****************************************************************************/ |
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int task_restart(pid_t pid) |
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{ |
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FAR _TCB *rtcb; |
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FAR _TCB *tcb; |
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int status; |
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irqstate_t state; |
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/* Make sure this task does not become ready-to-run while |
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* we are futzing with its TCB |
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*/ |
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sched_lock(); |
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/* Check if the task to restart is the calling task */ |
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rtcb = (FAR _TCB*)g_readytorun.head; |
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if ((pid == 0) || (pid == rtcb->pid)) |
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{ |
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/* Not implemented */ |
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return ERROR; |
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} |
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/* We are restarting some other task than ourselves */ |
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else |
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{ |
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/* Find for the TCB associated with matching pid */ |
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tcb = sched_gettcb(pid); |
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if (!tcb) |
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{ |
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/* There is no TCB with this pid */ |
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return ERROR; |
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} |
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/* Remove the TCB from whatever list it is in. At this point, the |
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* TCB should no longer be accessible to the system |
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*/ |
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state = irqsave(); |
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dq_rem((FAR dq_entry_t*)tcb, (dq_queue_t*)g_tasklisttable[tcb->task_state].list); |
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tcb->task_state = TSTATE_TASK_INVALID; |
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irqrestore(state); |
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/* Deallocate anything left in the TCB's queues */ |
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sig_cleanup(tcb); /* Deallocate Signal lists */ |
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/* Reset the current task priority */ |
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tcb->sched_priority = tcb->init_priority; |
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/* Reset the base task priority and the number of pending reprioritizations */ |
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#ifdef CONFIG_PRIORITY_INHERITANCE |
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tcb->base_priority = tcb->init_priority; |
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# if CONFIG_SEM_NNESTPRIO > 0 |
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tcb->npend_reprio = 0; |
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# endif |
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#endif |
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/* Re-initialize the processor-specific portion of the TCB |
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* This will reset the entry point and the start-up parameters |
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*/ |
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up_initial_state(tcb); |
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/* Add the task to the inactive task list */ |
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dq_addfirst((FAR dq_entry_t*)tcb, (dq_queue_t*)&g_inactivetasks); |
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tcb->task_state = TSTATE_TASK_INACTIVE; |
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/* Activate the task */ |
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status = task_activate(tcb); |
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if (status != OK) |
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{ |
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dq_rem((FAR dq_entry_t*)tcb, (dq_queue_t*)&g_inactivetasks); |
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sched_releasetcb(tcb); |
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return ERROR; |
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} |
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} |
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sched_unlock(); |
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return OK; |
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}
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