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129 lines
5.0 KiB
129 lines
5.0 KiB
/**************************************************************************** |
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* sched/sched_reprioritize.c |
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* |
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* Copyright (C) 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 <stdint.h> |
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#include <sched.h> |
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#include <errno.h> |
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#include "os_internal.h" |
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#ifdef CONFIG_PRIORITY_INHERITANCE |
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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_reprioritize |
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* |
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* Description: |
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* This function sets the priority of a specified task. |
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* |
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* NOTE: Setting a task's priority to the same value has a similar |
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* effect to sched_yield() -- The task will be moved to after all other |
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* tasks with the same priority. |
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* |
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* Inputs: |
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* tcb - the TCB of task to reprioritize. |
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* sched_priority - The new task priority |
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* |
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* Return Value: |
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* On success, sched_setparam() returns 0 (OK). On error, -1 |
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* (ERROR) is returned, and errno is set appropriately. |
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* |
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* EINVAL The parameter 'param' is invalid or does not make |
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* sense for the current scheduling policy. |
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* EPERM The calling task does not have appropriate privileges. |
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* ESRCH The task whose ID is pid could not be found. |
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* |
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* Assumptions: |
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* |
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****************************************************************************/ |
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int sched_reprioritize(FAR _TCB *tcb, int sched_priority) |
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{ |
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/* This function is equivalent to sched_setpriority() BUT it also has the |
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* side effect of discarding all priority inheritance history. This is |
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* done only on explicit, user-initiated reprioritization. |
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*/ |
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int ret = sched_setpriority(tcb, sched_priority); |
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if (ret == 0) |
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{ |
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/* Reset the base_priority -- the priority that the thread would return |
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* to once it posts the semaphore. |
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*/ |
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tcb->base_priority = (uint8_t)sched_priority; |
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/* Discard any pending reprioritizations as well */ |
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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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} |
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return ret; |
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} |
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#endif /* CONFIG_PRIORITY_INHERITANCE */
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