如何集成semBCreate（VxWorks）和sem_init（Linux）信号功能-解网

问：

我有一个任务，我有一个基于 Vxworks 的大代码，现在我想将其迁移到 Linux C 语言。我的目标是不更改我的原始代码，如下所示：

#ifdef COMPILE_IN_LINUX
pid = semBCreate(int arg1, long int arg2){
    sem_init(&pid, int arg1, long int arg2);
}
#endif

我知道这是错误的，因为 Vxworks 的 semBCreate 只有 2 个参数，但 sem_init（Linux）需要 3 个参数，上面的代码是用来表达我的目的的。我必须使用Vxworks的函数名来保留我的原始代码（semBCreate），但实现sem_init功能。如何完成??????请帮帮我，谢谢!!!!

C Linux vxworks

typedef int SEM_ID;

typedef struct
{
   // mapping the VxWorks semaphore ID with the Linux semaphore data
   SEM_ID semId;
   sem_t sem;
}semData;

#define MAX_NUMBER_OF_SEMAPHORES 100
semData semaphors[MAX_NUMBER_OF_SEMAPHORES]; // must be initialized with 0

SEM_ID semBCreate(int options, SEM_B_STATE initialState)
{
   int i = 0;
   for(; i < MAX_NUMBER_OF_SEMAPHORES; i++)
   {
      if(semaphors[i].semId == 0)
         break; // free space for new semaphore found
   }

   if(i == MAX_NUMBER_OF_SEMAPHORES)
      return 0; // no free space for new semaphore

   // Since VxWorks semaphores only work within the same process, the second
   // parameter can be set to 0.
   // The value of the third parameter is the same as in VxWorks (0 or 1 for binary semaphore).
   if(sem_init(&semaphors[i].sem, 0, (unsigned int)initialState) != 0)
      return 0; // creating semaphore failed

   semaphors[i].semId = i + 1;
   return semaphors[i].semId; // creating semaphore successfull
}

STATUS semTake(SEM_ID semId, int timeout)
{
   semData *semaphore = getSemaphore(semId);
   if(semaphore == NULL)
      return ERROR; // semaphore not found

   // I assumed 1 tick to be 1ms. If not, more calculation is needed!
   struct timespec tout;
   tout.tv_sec = timeout / 1000;
   tout.tv_nsec = (timeout % 1000) * 1000000;
   
   if(sem_timedwait(&semaphore->sem, &tout) != 0)
      return ERROR;
   
   return OK;
}

STATUS semGive(SEM_ID semId)
{
   semData *semaphore = getSemaphore(semId);
   if(semaphore == NULL)
      return ERROR; // semaphore not found

   if(sem_post(&semaphore->sem) != 0)
      return ERROR;
   
   return OK;
}

static semData* getSemaphore(SEM_ID semId)
{
   for(int i = 0; i < MAX_NUMBER_OF_SEMAPHORES; i++)
   {
      if(semaphors[i].semId == semId)
         return &semaphors[i]; // semaphore found
   }

   return NULL; // semaphore not found
}

我希望这能让您了解它是如何工作的！

上一个：如何使TaskSwitchHookAdd在VxWorks中执行工作

下一个：在 VxWorks shell 中禁用按 <CR> 继续或按 Q 退出提示

如何集成semBCreate（VxWorks）和sem_init（Linux）信号功能

How to intergrate semBCreate(VxWorks) and sem_init(Linux) signal function

评论