Re: problem of stack size in st_thread_create()

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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 <[email protected]> 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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The line you are asking about is a &quot;round up&quot; to the next page si=
ze calculation.<div><br></div><div>For example, if getpagesize() returns 40=
96, and the &quot;stk_size&quot; parameter is 10,000 it would round up to t=
he next even page size. (the division is doing integer math)</div>
<div><br></div><div>Hope this helps!</div><div><br><div class=3D"gmail_quot=
e">On Wed, Aug 10, 2011 at 9:06 AM, Alfred Zhong <span dir=3D"ltr">&lt;<a h=
ref=3D"mailto:[email protected]">[email protected]</a>&gt;</span> wro=
te:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex;"><span style=3D"font-family:arial, sans-seri=
f;font-size:13px;background-color:rgb(255, 255, 255)">Hi,<div>I am new to s=
tate thread library and am reading the source code of ST to study implement=
ation of threading.=A0</div>

<div><br></div><div>in the st_thread_create() function</div><div><br></div>=
<div>there is this code piece</div><div><br></div><div><div>if (stk_size =
=3D=3D 0)</div><div>=A0 =A0 stk_size =3D ST_DEFAULT_STACK_SIZE; =A0// I kno=
w this is to set the stack size to a default size, if the input size is 0</=
div>

<div>=A0 stk_size =3D ((stk_size + _ST_PAGE_SIZE - 1) / _ST_PAGE_SIZE) * _S=
T_PAGE_SIZE; //what does this mean?</div></div><div><br></div><div>Look lik=
e it equals (stk_size + ST_PAGE_SIZE -1) unless the previous division gives=
 0.</div>

<div><br></div><div>I am totally confused and can&#39;t find the answer in =
the code or the docs, please help!</div><div><br></div><div>Thanks a lot!</=
div><div>Alfred</div></span>
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<br></blockquote></div><br></div>

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