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146 lines
4.8 KiB
146 lines
4.8 KiB
/************************************************************************ |
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* sched/sched_getparam.c |
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* |
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* Copyright (C) 2007, 2009 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 "os_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: sched_getparam |
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* |
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* Description: |
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* This function gets the scheduling priority of the task |
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* specified by pid. |
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* |
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* Inputs: |
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* pid - the task ID of the task. If pid is zero, the priority |
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* of the calling task is returned. |
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* param - A structure whose member sched_priority is the integer |
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* priority. The task's priority is copied to the sched_priority |
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* element of this structure. |
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* |
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* Return Value: |
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* 0 (OK) if successful, otherwise -1 (ERROR). |
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* |
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* This function can fail if param is null or if pid does |
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* not correspond to any task. |
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* |
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* Assumptions: |
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* |
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************************************************************************/ |
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int sched_getparam (pid_t pid, struct sched_param * param) |
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{ |
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FAR _TCB *rtcb; |
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FAR _TCB *tcb; |
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int ret = OK; |
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if (!param) |
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{ |
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return ERROR; |
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} |
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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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/* Return the priority if the calling task. */ |
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param->sched_priority = (int)rtcb->sched_priority; |
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} |
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/* Ths pid is not for the calling task, we will have to look it up */ |
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else |
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{ |
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/* Get the TCB associated with this pid */ |
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sched_lock(); |
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tcb = sched_gettcb(pid); |
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if (!tcb) |
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{ |
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/* This pid does not correspond to any known task */ |
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ret = ERROR; |
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} |
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else |
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{ |
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/* Return the priority of the task */ |
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param->sched_priority = (int)tcb->sched_priority; |
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} |
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sched_unlock(); |
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} |
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return ret; |
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} |
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