 such as mmap, or using stack memory from the current thread. Using an ASYNC_stack_alloc_fn callback also allows manipulation of the stack size, which defaults to 32k. The stack size can be altered by allocating a stack of a size different to the requested size, and passing back the new stack size in the callback&#39;s <i>*num</i> parameter.</p>

<h1 id="RETURN-VALUES">RETURN VALUES</h1>

<p>ASYNC_init_thread returns 1 on success or 0 otherwise.</p>

<p>ASYNC_start_job returns one of <b>ASYNC_ERR</b>, <b>AS