Re: [ST-devel] [ST-users] problem of stack size in st_thread_create()

[John N. <jn...@gm...>]

The line you are asking about is a "round up" to the next page size
calculation.

For example, if getpagesize() returns 4096, and the "stk_size" parameter is
10,000 it would round up to the next even page size. (the division is doing
integer math)

Hope this helps!

On Wed, Aug 10, 2011 at 9:06 AM, Alfred Zhong <alf...@gm...> wrote:

> Hi,
> I am new to state thread library and am reading the source code of ST to
> study implementation of threading.
>
> in the st_thread_create() function
>
> there is this code piece
>
> if (stk_size == 0)
>     stk_size = ST_DEFAULT_STACK_SIZE;  // I know this is to set the stack
> size to a default size, if the input size is 0
>   stk_size = ((stk_size + _ST_PAGE_SIZE - 1) / _ST_PAGE_SIZE) *
> _ST_PAGE_SIZE; //what does this mean?
>
> Look like it equals (stk_size + ST_PAGE_SIZE -1) unless the previous
> division gives 0.
>
> I am totally confused and can't find the answer in the code or the docs,
> please help!
>
> Thanks a lot!
> Alfred
>
>
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