text: /*----------------------------------------------------------------------------
   * Copyright (c) <2013-2015>, <Huawei Technologies Co., Ltd>
   * All rights reserved.
   * 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 of the copyright holder 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 HOLDER 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.
   *---------------------------------------------------------------------------*/
   /*----------------------------------------------------------------------------
   * Notice of Export Control Law
   * ===============================================
   * Huawei LiteOS may be subject to applicable export control laws and regulations, which might
   * include those applicable to Huawei LiteOS of U.S. and the country in which you are located.
   * Import, export and usage of Huawei LiteOS in any manner by you shall be in compliance with such
   * applicable export control laws and regulations.
   *---------------------------------------------------------------------------*/
  
  #include "los_mux.h"
  #include "los_task.h"
  #include "los_api_mutex.h"
  #include "los_inspect_entry.h"
  
  #ifdef LOSCFG_LIB_LIBC
  #include "string.h"
  #endif
  
  
  #ifdef __cplusplus
  #if __cplusplus
  extern "C" {
  #endif /* __cpluscplus */
  #endif /* __cpluscplus */
  
  
  /*互斥锁句柄ID*/
  UINT32 g_Testmux01;
  
  
  /*任务PID*/
  UINT32 g_TestTaskID01;
  UINT32 g_TestTaskID02;
  
  
  VOID Example_MutexTask1()
  {
      UINT32 uwRet;
  
      dprintf("task1 try to get mutex, wait 10 Tick.\n");
      /*申请互斥锁*/
      uwRet=LOS_MuxPend(g_Testmux01, 10);
  
      if(uwRet == LOS_OK)
      {
          dprintf("task1 get mutex g_Testmux01.\n");
          /*释放互斥锁*/
          LOS_MuxPost(g_Testmux01);
          return;
      }
      else if(uwRet == LOS_ERRNO_MUX_TIMEOUT )
      {
          dprintf("task1 timeout and try to get  mutex, wait forever.\n");
          /*LOS_WAIT_FOREVER方式申请互斥锁,获取不到时程序阻塞，不会返回*/
          uwRet = LOS_MuxPend(g_Testmux01, LOS_WAIT_FOREVER);
          if(uwRet == LOS_OK)
          {
              dprintf("task1 wait forever,got mutex g_Testmux01 success.\n");
              /*释放互斥锁*/
              LOS_MuxPost(g_Testmux01);
              LOS_InspectStatusSetByID(LOS_INSPECT_MUTEX,LOS_INSPECT_STU_SUCCESS);
              return;
          }
      }
      return;
  }
  
  VOID Example_MutexTask2()
  {
      UINT32 uwRet;
  
      dprintf("task2 try to get mutex, wait forever.\n");
      /*申请互斥锁*/
      uwRet=LOS_MuxPend(g_Testmux01, LOS_WAIT_FOREVER);
      if(uwRet != LOS_OK)
      {
          dprintf("task2 LOS_MuxPend failed .\n");
          return;
      }
  
      dprintf("task2 get mutex g_Testmux01 and suspend 100 Tick.\n");
  
      /*任务休眠100 Tick*/
      LOS_TaskDelay(100);
  
      dprintf("task2 resumed and post the g_Testmux01\n");
      /*释放互斥锁*/
      LOS_MuxPost(g_Testmux01);
      return;
  }
  
  UINT32 Example_MutexLock(VOID)
  {
      UINT32 uwRet;
      TSK_INIT_PARAM_S stTask1;
      TSK_INIT_PARAM_S stTask2;
  
      /*创建互斥锁*/
      LOS_MuxCreate(&g_Testmux01);
  
      /*锁任务调度*/
      LOS_TaskLock();
  
      /*创建任务1*/
      memset(&stTask1, 0, sizeof(TSK_INIT_PARAM_S));
      stTask1.pfnTaskEntry = (TSK_ENTRY_FUNC)Example_MutexTask1;
      stTask1.pcName       = "MutexTsk1";
      stTask1.uwStackSize  = LOSCFG_BASE_CORE_TSK_DEFAULT_STACK_SIZE;
      stTask1.usTaskPrio   = 5;
      uwRet = LOS_TaskCreate(&g_TestTaskID01, &stTask1);
      if(uwRet != LOS_OK)
      {
          dprintf("task1 create failed .\n");
          return LOS_NOK;
      }
  
      /*创建任务2*/
      memset(&stTask2, 0, sizeof(TSK_INIT_PARAM_S));
      stTask2.pfnTaskEntry = (TSK_ENTRY_FUNC)Example_MutexTask2;
      stTask2.pcName       = "MutexTsk2";
      stTask2.uwStackSize  = LOSCFG_BASE_CORE_TSK_DEFAULT_STACK_SIZE;
      stTask2.usTaskPrio   = 4;
      uwRet = LOS_TaskCreate(&g_TestTaskID02, &stTask2);
      if(uwRet != LOS_OK)
      {
          dprintf("task2 create failed .\n");
          return LOS_NOK;
      }
  
      /*解锁任务调度*/
      LOS_TaskUnlock();
      /*任务休眠300 Tick*/
      LOS_TaskDelay(300);
  
      /*删除互斥锁*/
      LOS_MuxDelete(g_Testmux01);
  
      /*删除任务1*/
      uwRet = LOS_TaskDelete(g_TestTaskID01);
      if(uwRet != LOS_OK)
      {
          dprintf("task1 delete failed .\n");
          return LOS_NOK;
      }
      /*删除任务2*/
      uwRet = LOS_TaskDelete(g_TestTaskID02);
      if(uwRet != LOS_OK)
      {
          dprintf("task2 delete failed .\n");
          return LOS_NOK;
      }
  
      return LOS_OK;
  }
  
  
  #ifdef __cplusplus
  #if __cplusplus
  }
  #endif /* __cpluscplus */
  #endif /* __cpluscplus */
  
  
  