the
stack is available for use. However, this is an inefficient solution, and not
recommended.
</P>
<P>
This is a suggestion for how a multithreaded program that needs to set up
non-default JIT stacks might operate:
<pre>
  During thread initalization
    thread_local_var = pcre_jit_stack_alloc(...)

  During thread exit
    pcre_jit_stack_free(thread_local_var)

  Use a one-line callback function
    return thread_local_var
</pre>
All the functions described in this section do nothing if JIT is not availab