198 lines
6.1 KiB
C
198 lines
6.1 KiB
C
/*----------------------------------------------------------------------------
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* RL-ARM - RTX
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*----------------------------------------------------------------------------
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* Name: RT_MUTEX.C
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* Purpose: Implements mutex synchronization objects
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* Rev.: V4.70
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*----------------------------------------------------------------------------
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*
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* Copyright (c) 1999-2009 KEIL, 2009-2013 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_List.h"
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#include "rt_Task.h"
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#include "rt_Mutex.h"
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#include "rt_HAL_CM.h"
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/*----------------------------------------------------------------------------
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* Functions
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*---------------------------------------------------------------------------*/
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/*--------------------------- rt_mut_init -----------------------------------*/
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void rt_mut_init (OS_ID mutex) {
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/* Initialize a mutex object */
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P_MUCB p_MCB = mutex;
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p_MCB->cb_type = MUCB;
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p_MCB->prio = 0;
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p_MCB->level = 0;
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p_MCB->p_lnk = NULL;
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p_MCB->owner = NULL;
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}
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/*--------------------------- rt_mut_delete ---------------------------------*/
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#ifdef __CMSIS_RTOS
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OS_RESULT rt_mut_delete (OS_ID mutex) {
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/* Delete a mutex object */
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P_MUCB p_MCB = mutex;
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P_TCB p_TCB;
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/* Restore owner task's priority. */
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if (p_MCB->level != 0) {
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p_MCB->owner->prio = p_MCB->prio;
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if (p_MCB->owner != os_tsk.run) {
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rt_resort_prio (p_MCB->owner);
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}
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}
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while (p_MCB->p_lnk != NULL) {
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/* A task is waiting for mutex. */
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p_TCB = rt_get_first ((P_XCB)p_MCB);
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rt_ret_val(p_TCB, 0/*osOK*/);
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rt_rmv_dly(p_TCB);
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p_TCB->state = READY;
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rt_put_prio (&os_rdy, p_TCB);
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}
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if (os_rdy.p_lnk && (os_rdy.p_lnk->prio > os_tsk.run->prio)) {
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/* preempt running task */
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rt_put_prio (&os_rdy, os_tsk.run);
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os_tsk.run->state = READY;
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rt_dispatch (NULL);
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}
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p_MCB->cb_type = 0;
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return (OS_R_OK);
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}
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#endif
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/*--------------------------- rt_mut_release --------------------------------*/
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OS_RESULT rt_mut_release (OS_ID mutex) {
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/* Release a mutex object */
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P_MUCB p_MCB = mutex;
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P_TCB p_TCB;
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if (p_MCB->level == 0 || p_MCB->owner != os_tsk.run) {
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/* Unbalanced mutex release or task is not the owner */
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return (OS_R_NOK);
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}
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if (--p_MCB->level != 0) {
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return (OS_R_OK);
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}
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/* Restore owner task's priority. */
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os_tsk.run->prio = p_MCB->prio;
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if (p_MCB->p_lnk != NULL) {
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/* A task is waiting for mutex. */
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p_TCB = rt_get_first ((P_XCB)p_MCB);
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#ifdef __CMSIS_RTOS
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rt_ret_val(p_TCB, 0/*osOK*/);
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#else
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rt_ret_val(p_TCB, OS_R_MUT);
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#endif
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rt_rmv_dly (p_TCB);
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/* A waiting task becomes the owner of this mutex. */
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p_MCB->level = 1;
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p_MCB->owner = p_TCB;
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p_MCB->prio = p_TCB->prio;
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/* Priority inversion, check which task continues. */
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if (os_tsk.run->prio >= rt_rdy_prio()) {
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rt_dispatch (p_TCB);
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}
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else {
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/* Ready task has higher priority than running task. */
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rt_put_prio (&os_rdy, os_tsk.run);
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rt_put_prio (&os_rdy, p_TCB);
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os_tsk.run->state = READY;
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p_TCB->state = READY;
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rt_dispatch (NULL);
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}
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}
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else {
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/* Check if own priority raised by priority inversion. */
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if (rt_rdy_prio() > os_tsk.run->prio) {
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rt_put_prio (&os_rdy, os_tsk.run);
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os_tsk.run->state = READY;
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rt_dispatch (NULL);
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}
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}
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return (OS_R_OK);
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}
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/*--------------------------- rt_mut_wait -----------------------------------*/
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OS_RESULT rt_mut_wait (OS_ID mutex, U16 timeout) {
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/* Wait for a mutex, continue when mutex is free. */
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P_MUCB p_MCB = mutex;
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if (p_MCB->level == 0) {
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p_MCB->owner = os_tsk.run;
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p_MCB->prio = os_tsk.run->prio;
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goto inc;
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}
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if (p_MCB->owner == os_tsk.run) {
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/* OK, running task is the owner of this mutex. */
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inc:p_MCB->level++;
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return (OS_R_OK);
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}
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/* Mutex owned by another task, wait until released. */
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if (timeout == 0) {
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return (OS_R_TMO);
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}
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/* Raise the owner task priority if lower than current priority. */
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/* This priority inversion is called priority inheritance. */
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if (p_MCB->prio < os_tsk.run->prio) {
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p_MCB->owner->prio = os_tsk.run->prio;
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rt_resort_prio (p_MCB->owner);
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}
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if (p_MCB->p_lnk != NULL) {
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rt_put_prio ((P_XCB)p_MCB, os_tsk.run);
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}
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else {
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p_MCB->p_lnk = os_tsk.run;
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os_tsk.run->p_lnk = NULL;
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os_tsk.run->p_rlnk = (P_TCB)p_MCB;
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}
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rt_block(timeout, WAIT_MUT);
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return (OS_R_TMO);
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}
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/*----------------------------------------------------------------------------
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* end of file
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*---------------------------------------------------------------------------*/
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