Diff: rtx/TARGET_ARM7/rt_Mutex.c

Revision:

105:94371fac911d

Parent:

104:07314541bd12

--- a/rtx/TARGET_ARM7/rt_Mutex.c	Thu Feb 18 10:00:31 2016 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,197 +0,0 @@
-/*----------------------------------------------------------------------------
- *      RL-ARM - RTX
- *----------------------------------------------------------------------------
- *      Name:    RT_MUTEX.C
- *      Purpose: Implements mutex synchronization objects
- *      Rev.:    V4.60
- *----------------------------------------------------------------------------
- *
- * Copyright (c) 1999-2009 KEIL, 2009-2015 ARM Germany GmbH
- * All rights reserved.
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *  - Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- *  - 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.
- *  - Neither the name of ARM  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 COPYRIGHT HOLDERS AND 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.
- *---------------------------------------------------------------------------*/
-
-#include "rt_TypeDef.h"
-#include "RTX_Conf.h"
-#include "rt_List.h"
-#include "rt_Task.h"
-#include "rt_Mutex.h"
-#include "rt_HAL_CM.h"
-
-
-/*----------------------------------------------------------------------------
- *      Functions
- *---------------------------------------------------------------------------*/
-
-
-/*--------------------------- rt_mut_init -----------------------------------*/
-
-void rt_mut_init (OS_ID mutex) {
-  /* Initialize a mutex object */
-  P_MUCB p_MCB = mutex;
-
-  p_MCB->cb_type = MUCB;
-  p_MCB->prio    = 0;
-  p_MCB->level   = 0;
-  p_MCB->p_lnk   = NULL;
-  p_MCB->owner   = NULL;
-}
-
-
-/*--------------------------- rt_mut_delete ---------------------------------*/
-
-#ifdef __CMSIS_RTOS
-OS_RESULT rt_mut_delete (OS_ID mutex) {
-  /* Delete a mutex object */
-  P_MUCB p_MCB = mutex;
-  P_TCB  p_TCB;
-
-  /* Restore owner task's priority. */
-  if (p_MCB->level != 0) {
-    p_MCB->owner->prio = p_MCB->prio;
-    if (p_MCB->owner != os_tsk.run) {
-      rt_resort_prio (p_MCB->owner);
-    }
-  }
-
-  while (p_MCB->p_lnk != NULL) {
-    /* A task is waiting for mutex. */
-    p_TCB = rt_get_first ((P_XCB)p_MCB);
-    rt_ret_val(p_TCB, 0/*osOK*/);
-    rt_rmv_dly(p_TCB);
-    p_TCB->state = READY;
-    rt_put_prio (&os_rdy, p_TCB);
-  }
-
-  if (os_rdy.p_lnk && (os_rdy.p_lnk->prio > os_tsk.run->prio)) {
-    /* preempt running task */
-    rt_put_prio (&os_rdy, os_tsk.run);
-    os_tsk.run->state = READY;
-    rt_dispatch (NULL);
-  }
-
-  p_MCB->cb_type = 0;
-
-  return (OS_R_OK);
-}
-#endif
-
-
-/*--------------------------- rt_mut_release --------------------------------*/
-
-OS_RESULT rt_mut_release (OS_ID mutex) {
-  /* Release a mutex object */
-  P_MUCB p_MCB = mutex;
-  P_TCB  p_TCB;
-
-  if (p_MCB->level == 0 || p_MCB->owner != os_tsk.run) {
-    /* Unbalanced mutex release or task is not the owner */
-    return (OS_R_NOK);
-  }
-  if (--p_MCB->level != 0) {
-    return (OS_R_OK);
-  }
-  /* Restore owner task's priority. */
-  os_tsk.run->prio = p_MCB->prio;
-  if (p_MCB->p_lnk != NULL) {
-    /* A task is waiting for mutex. */
-    p_TCB = rt_get_first ((P_XCB)p_MCB);
-#ifdef __CMSIS_RTOS
-    rt_ret_val(p_TCB, 0/*osOK*/);
-#else
-    rt_ret_val(p_TCB, OS_R_MUT);
-#endif
-    rt_rmv_dly (p_TCB);
-    /* A waiting task becomes the owner of this mutex. */
-    p_MCB->level     = 1;
-    p_MCB->owner     = p_TCB;
-    p_MCB->prio      = p_TCB->prio;
-    /* Priority inversion, check which task continues. */
-    if (os_tsk.run->prio >= rt_rdy_prio()) {
-      rt_dispatch (p_TCB);
-    }
-    else {
-      /* Ready task has higher priority than running task. */
-      rt_put_prio (&os_rdy, os_tsk.run);
-      rt_put_prio (&os_rdy, p_TCB);
-      os_tsk.run->state = READY;
-      p_TCB->state      = READY;
-      rt_dispatch (NULL);
-    }
-  }
-  else {
-    /* Check if own priority raised by priority inversion. */
-    if (rt_rdy_prio() > os_tsk.run->prio) {
-      rt_put_prio (&os_rdy, os_tsk.run);
-      os_tsk.run->state = READY;
-      rt_dispatch (NULL);
-    }
-  }
-  return (OS_R_OK);
-}
-
-
-/*--------------------------- rt_mut_wait -----------------------------------*/
-
-OS_RESULT rt_mut_wait (OS_ID mutex, U16 timeout) {
-  /* Wait for a mutex, continue when mutex is free. */
-  P_MUCB p_MCB = mutex;
-
-  if (p_MCB->level == 0) {
-    p_MCB->owner = os_tsk.run;
-    p_MCB->prio  = os_tsk.run->prio;
-    goto inc;
-  }
-  if (p_MCB->owner == os_tsk.run) {
-    /* OK, running task is the owner of this mutex. */
-inc:p_MCB->level++;
-    return (OS_R_OK);
-  }
-  /* Mutex owned by another task, wait until released. */
-  if (timeout == 0) {
-    return (OS_R_TMO);
-  }
-  /* Raise the owner task priority if lower than current priority. */
-  /* This priority inversion is called priority inheritance.       */
-  if (p_MCB->prio < os_tsk.run->prio) {
-    p_MCB->owner->prio = os_tsk.run->prio;
-    rt_resort_prio (p_MCB->owner);
-  }
-  if (p_MCB->p_lnk != NULL) {
-    rt_put_prio ((P_XCB)p_MCB, os_tsk.run);
-  }
-  else {
-    p_MCB->p_lnk = os_tsk.run;
-    os_tsk.run->p_lnk  = NULL;
-    os_tsk.run->p_rlnk = (P_TCB)p_MCB;
-  }
-  rt_block(timeout, WAIT_MUT);
-  return (OS_R_TMO);
-}
-
-
-/*----------------------------------------------------------------------------
- * end of file
- *---------------------------------------------------------------------------*/
-