problem of stack size in st_thread_create()

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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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Hi,<div>I am new to state thread library and am reading the source code of =
ST to study implementation of threading.=A0</div><div><br></div><div>in the=
 st_thread_create() function</div><div><br></div><div>there is this code pi=
ece</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 know 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) * _ST_PAGE_SIZE; //what does this mea=
n?</div>
</div><div><br></div><div>Look like 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 hel=
p!</div>
<div><br></div><div>Thanks a lot!</div><div>Alfred</div>

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