325 rindas
9.6 KiB
C
325 rindas
9.6 KiB
C
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/*----------------------------------------------------------------------------
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* RL-ARM - RTX
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*----------------------------------------------------------------------------
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* Name: RT_LIST.C
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* Purpose: Functions for the management of different lists
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* Rev.: V4.60
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*----------------------------------------------------------------------------
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*
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* Copyright (c) 1999-2009 KEIL, 2009-2012 ARM Germany GmbH
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* All rights reserved.
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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 are met:
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* - 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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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* - Neither the name of ARM nor the names of its contributors may be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN 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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#include "rt_TypeDef.h"
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#include "RTX_Config.h"
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#include "rt_System.h"
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#include "rt_List.h"
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#include "rt_Task.h"
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#include "rt_Time.h"
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#ifdef __CORTEX_A9
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#include "rt_HAL_CA.h"
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#else
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#include "rt_HAL_CM.h"
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#endif
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/*----------------------------------------------------------------------------
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* Global Variables
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*---------------------------------------------------------------------------*/
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/* List head of chained ready tasks */
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struct OS_XCB os_rdy;
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/* List head of chained delay tasks */
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struct OS_XCB os_dly;
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/*----------------------------------------------------------------------------
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* Functions
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*---------------------------------------------------------------------------*/
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/*--------------------------- rt_put_prio -----------------------------------*/
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void rt_put_prio (P_XCB p_CB, P_TCB p_task) {
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/* Put task identified with "p_task" into list ordered by priority. */
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/* "p_CB" points to head of list; list has always an element at end with */
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/* a priority less than "p_task->prio". */
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P_TCB p_CB2;
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U32 prio;
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BOOL sem_mbx = __FALSE;
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if (p_CB->cb_type == SCB || p_CB->cb_type == MCB || p_CB->cb_type == MUCB) {
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sem_mbx = __TRUE;
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}
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prio = p_task->prio;
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p_CB2 = p_CB->p_lnk;
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/* Search for an entry in the list */
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while (p_CB2 != NULL && prio <= p_CB2->prio) {
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p_CB = (P_XCB)p_CB2;
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p_CB2 = p_CB2->p_lnk;
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}
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/* Entry found, insert the task into the list */
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p_task->p_lnk = p_CB2;
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p_CB->p_lnk = p_task;
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if (sem_mbx) {
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if (p_CB2 != NULL) {
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p_CB2->p_rlnk = p_task;
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}
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p_task->p_rlnk = (P_TCB)p_CB;
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}
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else {
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p_task->p_rlnk = NULL;
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}
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}
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/*--------------------------- rt_get_first ----------------------------------*/
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P_TCB rt_get_first (P_XCB p_CB) {
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/* Get task at head of list: it is the task with highest priority. */
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/* "p_CB" points to head of list. */
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P_TCB p_first;
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p_first = p_CB->p_lnk;
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p_CB->p_lnk = p_first->p_lnk;
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if (p_CB->cb_type == SCB || p_CB->cb_type == MCB || p_CB->cb_type == MUCB) {
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if (p_first->p_lnk != NULL) {
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p_first->p_lnk->p_rlnk = (P_TCB)p_CB;
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p_first->p_lnk = NULL;
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}
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p_first->p_rlnk = NULL;
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}
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else {
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p_first->p_lnk = NULL;
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}
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return (p_first);
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}
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/*--------------------------- rt_put_rdy_first ------------------------------*/
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void rt_put_rdy_first (P_TCB p_task) {
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/* Put task identified with "p_task" at the head of the ready list. The */
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/* task must have at least a priority equal to highest priority in list. */
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p_task->p_lnk = os_rdy.p_lnk;
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p_task->p_rlnk = NULL;
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os_rdy.p_lnk = p_task;
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}
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/*--------------------------- rt_get_same_rdy_prio --------------------------*/
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P_TCB rt_get_same_rdy_prio (void) {
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/* Remove a task of same priority from ready list if any exists. Other- */
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/* wise return NULL. */
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P_TCB p_first;
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p_first = os_rdy.p_lnk;
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if (p_first->prio == os_tsk.run->prio) {
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os_rdy.p_lnk = os_rdy.p_lnk->p_lnk;
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return (p_first);
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}
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return (NULL);
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}
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/*--------------------------- rt_resort_prio --------------------------------*/
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void rt_resort_prio (P_TCB p_task) {
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/* Re-sort ordered lists after the priority of 'p_task' has changed. */
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P_TCB p_CB;
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if (p_task->p_rlnk == NULL) {
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if (p_task->state == READY) {
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/* Task is chained into READY list. */
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p_CB = (P_TCB)&os_rdy;
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goto res;
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}
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}
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else {
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p_CB = p_task->p_rlnk;
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while (p_CB->cb_type == TCB) {
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/* Find a header of this task chain list. */
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p_CB = p_CB->p_rlnk;
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}
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res:rt_rmv_list (p_task);
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rt_put_prio ((P_XCB)p_CB, p_task);
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}
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}
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/*--------------------------- rt_put_dly ------------------------------------*/
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void rt_put_dly (P_TCB p_task, U16 delay) {
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/* Put a task identified with "p_task" into chained delay wait list using */
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/* a delay value of "delay". */
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P_TCB p;
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U32 delta,idelay = delay;
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p = (P_TCB)&os_dly;
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if (p->p_dlnk == NULL) {
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/* Delay list empty */
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delta = 0;
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goto last;
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}
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delta = os_dly.delta_time;
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while (delta < idelay) {
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if (p->p_dlnk == NULL) {
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/* End of list found */
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last: p_task->p_dlnk = NULL;
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p->p_dlnk = p_task;
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p_task->p_blnk = p;
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p->delta_time = (U16)(idelay - delta);
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p_task->delta_time = 0;
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return;
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}
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p = p->p_dlnk;
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delta += p->delta_time;
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}
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/* Right place found */
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p_task->p_dlnk = p->p_dlnk;
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p->p_dlnk = p_task;
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p_task->p_blnk = p;
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if (p_task->p_dlnk != NULL) {
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p_task->p_dlnk->p_blnk = p_task;
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}
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p_task->delta_time = (U16)(delta - idelay);
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p->delta_time -= p_task->delta_time;
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}
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/*--------------------------- rt_dec_dly ------------------------------------*/
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void rt_dec_dly (void) {
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/* Decrement delta time of list head: remove tasks having a value of zero.*/
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P_TCB p_rdy;
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if (os_dly.p_dlnk == NULL) {
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return;
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}
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os_dly.delta_time--;
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while ((os_dly.delta_time == 0) && (os_dly.p_dlnk != NULL)) {
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p_rdy = os_dly.p_dlnk;
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if (p_rdy->p_rlnk != NULL) {
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/* Task is really enqueued, remove task from semaphore/mailbox */
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/* timeout waiting list. */
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p_rdy->p_rlnk->p_lnk = p_rdy->p_lnk;
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if (p_rdy->p_lnk != NULL) {
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p_rdy->p_lnk->p_rlnk = p_rdy->p_rlnk;
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p_rdy->p_lnk = NULL;
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}
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p_rdy->p_rlnk = NULL;
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}
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rt_put_prio (&os_rdy, p_rdy);
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os_dly.delta_time = p_rdy->delta_time;
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if (p_rdy->state == WAIT_ITV) {
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/* Calculate the next time for interval wait. */
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p_rdy->delta_time = p_rdy->interval_time + (U16)os_time;
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}
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p_rdy->state = READY;
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os_dly.p_dlnk = p_rdy->p_dlnk;
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if (p_rdy->p_dlnk != NULL) {
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p_rdy->p_dlnk->p_blnk = (P_TCB)&os_dly;
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p_rdy->p_dlnk = NULL;
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}
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p_rdy->p_blnk = NULL;
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}
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}
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/*--------------------------- rt_rmv_list -----------------------------------*/
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void rt_rmv_list (P_TCB p_task) {
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/* Remove task identified with "p_task" from ready, semaphore or mailbox */
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/* waiting list if enqueued. */
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P_TCB p_b;
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if (p_task->p_rlnk != NULL) {
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/* A task is enqueued in semaphore / mailbox waiting list. */
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p_task->p_rlnk->p_lnk = p_task->p_lnk;
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if (p_task->p_lnk != NULL) {
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p_task->p_lnk->p_rlnk = p_task->p_rlnk;
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}
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return;
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}
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p_b = (P_TCB)&os_rdy;
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while (p_b != NULL) {
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/* Search the ready list for task "p_task" */
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if (p_b->p_lnk == p_task) {
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p_b->p_lnk = p_task->p_lnk;
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return;
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}
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p_b = p_b->p_lnk;
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}
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}
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/*--------------------------- rt_rmv_dly ------------------------------------*/
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void rt_rmv_dly (P_TCB p_task) {
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/* Remove task identified with "p_task" from delay list if enqueued. */
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P_TCB p_b;
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p_b = p_task->p_blnk;
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if (p_b != NULL) {
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/* Task is really enqueued */
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p_b->p_dlnk = p_task->p_dlnk;
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if (p_task->p_dlnk != NULL) {
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/* 'p_task' is in the middle of list */
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p_b->delta_time += p_task->delta_time;
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p_task->p_dlnk->p_blnk = p_b;
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p_task->p_dlnk = NULL;
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}
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else {
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/* 'p_task' is at the end of list */
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p_b->delta_time = 0;
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}
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p_task->p_blnk = NULL;
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}
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}
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/*--------------------------- rt_psq_enq ------------------------------------*/
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void rt_psq_enq (OS_ID entry, U32 arg) {
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/* Insert post service request "entry" into ps-queue. */
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U32 idx;
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idx = rt_inc_qi (os_psq->size, &os_psq->count, &os_psq->first);
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if (idx < os_psq->size) {
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os_psq->q[idx].id = entry;
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os_psq->q[idx].arg = arg;
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}
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else {
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os_error (OS_ERR_FIFO_OVF);
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}
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}
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/*----------------------------------------------------------------------------
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* end of file
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*---------------------------------------------------------------------------*/
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