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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<span class=3D"Apple-style-span" style=3D"font-family: arial, sans-serif; f=
ont-size: 13px; background-color: rgb(255, 255, 255); ">Hi,<div>I am new to=
 state thread library and am reading the source code of ST to study impleme=
ntation 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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