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我正在使用named_semaphore，我想声明一个信号量，然后询问它的进程数，但目前我得到这个例如：

const unsigned N_CORES = boost::thread::hardware_concurrency();
named_semaphore SEMAPHORE(open_or_create, PROCESS_NAME, N_CORES);

我首先要声明 SEMAPHORE，然后再获取内核数。

根据api：

  //!Creates a global semaphore with a name, and an initial count. 
  //!If the semaphore can't be created throws interprocess_exception
  named_semaphore(create_only_t, const char *name, unsigned int initialCount);

  //!Opens or creates a global semaphore with a name, and an initial count. 
  //!If the semaphore is created, this call is equivalent to
  //!named_semaphore(create_only_t, ...)
  //!If the semaphore is already created, this call is equivalent to
  //!named_semaphore(open_only_t, ... )
  //!and initialCount is ignored.
  named_semaphore(open_or_create_t, const char *name, unsigned int initialCount);

我试过了：

 const unsigned N_CORES = boost::thread::hardware_concurrency();
 named_semaphore SEMAPHORE(create_only, PROCESS_NAME, N_CORES);

 // at other point
 SEMAPHORE(open_or_create, PROCESS_NAME, numberOfCores);

但显示此错误：

term does not evaluate to a function taking 3 arguments
4

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