[Info-vax] Volatile, was: Re: yet another sys$qiow question

[Craig A. Berry]

On 8/20/15 8:54 AM, JF Mezei wrote:
> So, after reading this, I am still puzzled...
>
> in DEC-C, how does one declare a variable as "volatile" ?

As with any C compiler, using the "volatile" keyword, obviously:

$ help cc language_topics type_qualifiers volatile

CC

   Language_topics

     Type_Qualifiers

       volatile

          The volatile data-type qualifier prevents an object from being
          stored in a machine register, forcing it to be allocated in 
memory.
          This data-type qualifier is useful for declaring data that is 
to be
          accessed asynchronously.  A device driver application often uses
          volatile data storage.  Like const, you can specify the volatile
          data-type qualifier with any of the storage-class specifiers or
          modifiers with the exception of the register storage class.