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Diffstat (limited to 'nuttx/sched/sched_setpriority.c')
-rw-r--r-- | nuttx/sched/sched_setpriority.c | 233 |
1 files changed, 0 insertions, 233 deletions
diff --git a/nuttx/sched/sched_setpriority.c b/nuttx/sched/sched_setpriority.c deleted file mode 100644 index 6aa0789ea..000000000 --- a/nuttx/sched/sched_setpriority.c +++ /dev/null @@ -1,233 +0,0 @@ -/**************************************************************************** - * sched/sched_setpriority.c - * - * Copyright (C) 2009 Gregory Nutt. All rights reserved. - * Author: Gregory Nutt <gnutt@nuttx.org> - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in - * the documentation and/or other materials provided with the - * distribution. - * 3. Neither the name NuttX nor the names of its contributors may be - * used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS - * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE - * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, - * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, - * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS - * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED - * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN - * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE - * POSSIBILITY OF SUCH DAMAGE. - * - ****************************************************************************/ - -/**************************************************************************** - * Included Files - ****************************************************************************/ - -#include <nuttx/config.h> - -#include <stdint.h> -#include <sched.h> -#include <errno.h> -#include <nuttx/arch.h> - -#include "os_internal.h" - -/**************************************************************************** - * Definitions - ****************************************************************************/ - -/**************************************************************************** - * Private Type Declarations - ****************************************************************************/ - -/**************************************************************************** - * Global Variables - ****************************************************************************/ - -/**************************************************************************** - * Private Variables - ****************************************************************************/ - -/**************************************************************************** - * Private Function Prototypes - ****************************************************************************/ - -/**************************************************************************** - * Private Functions - ****************************************************************************/ - -/**************************************************************************** - * Public Functions - ****************************************************************************/ - -/**************************************************************************** - * Name: sched_setpriority - * - * Description: - * This function sets the priority of a specified task. - * - * NOTE: Setting a task's priority to the same value has a similar effect - * to sched_yield() -- The task will be moved to after all other tasks - * with the same priority. - * - * Inputs: - * tcb - the TCB of task to reprioritize. - * sched_priority - The new task priority - * - * Return Value: - * On success, sched_setparam() returns 0 (OK). On error, -1 (ERROR) is - * returned, and errno is set appropriately. - * - * EINVAL The parameter 'param' is invalid or does not make sense for the - * current scheduling policy. - * EPERM The calling task does not have appropriate privileges. - * ESRCH The task whose ID is pid could not be found. - * - * Assumptions: - * - ****************************************************************************/ - -int sched_setpriority(FAR _TCB *tcb, int sched_priority) -{ - FAR _TCB *rtcb = (FAR _TCB*)g_readytorun.head; - tstate_t task_state; - irqstate_t saved_state; - - /* Verify that the requested priority is in the valid range */ - - if (sched_priority < SCHED_PRIORITY_MIN || - sched_priority > SCHED_PRIORITY_MAX) - { - errno = EINVAL; - return ERROR; - } - - /* We need to assure that there there is no interrupt activity while - * performing the following. - */ - - saved_state = irqsave(); - - /* There are four cases that must be considered: */ - - task_state = tcb->task_state; - switch (task_state) - { - /* CASE 1. The task is running or ready-to-run and a context switch - * may be caused by the re-prioritization - */ - - case TSTATE_TASK_RUNNING: - - /* A context switch will occur if the new priority of the running - * task becomes less than OR EQUAL TO the next highest priority - * ready to run task. - */ - - if (sched_priority <= tcb->flink->sched_priority) - { - /* A context switch will occur. */ - - up_reprioritize_rtr(tcb, (uint8_t)sched_priority); - } - - /* Otherwise, we can just change priority since it has no effect */ - - else - { - /* Change the task priority */ - - tcb->sched_priority = (uint8_t)sched_priority; - } - break; - - /* CASE 2. The task is running or ready-to-run and a context switch - * may be caused by the re-prioritization - */ - - case TSTATE_TASK_READYTORUN: - - /* A context switch will occur if the new priority of the ready-to - * run task is (strictly) greater than the current running task - */ - - if (sched_priority > rtcb->sched_priority) - { - /* A context switch will occur. */ - - up_reprioritize_rtr(tcb, (uint8_t)sched_priority); - } - - /* Otherwise, we can just change priority and re-schedule (since it - * have no other effect). - */ - - else - { - /* Remove the TCB from the ready-to-run task list */ - - ASSERT(!sched_removereadytorun(tcb)); - - /* Change the task priority */ - - tcb->sched_priority = (uint8_t)sched_priority; - - /* Put it back into the ready-to-run task list */ - - ASSERT(!sched_addreadytorun(tcb)); - } - break; - - /* CASE 3. The task is not in the ready to run list. Changing its - * Priority cannot effect the currently executing task. - */ - - default: - - /* CASE 3a. The task resides in a prioritized list. */ - - if (g_tasklisttable[task_state].prioritized) - { - /* Remove the TCB from the prioritized task list */ - - dq_rem((FAR dq_entry_t*)tcb, (FAR dq_queue_t*)g_tasklisttable[task_state].list); - - /* Change the task priority */ - - tcb->sched_priority = (uint8_t)sched_priority; - - /* Put it back into the prioritized list at the correct - * position - */ - - sched_addprioritized(tcb, (FAR dq_queue_t*)g_tasklisttable[task_state].list); - } - - /* CASE 3b. The task resides in a non-prioritized list. */ - - else - { - /* Just change the task's priority */ - - tcb->sched_priority = (uint8_t)sched_priority; - } - break; - } - - irqrestore(saved_state); - return OK; -} |