Description:
------------
NOTE: I use php version 

PHP 5.1.4 (cli) (built: May  8 2006 08:41:41)

but it is not listed there. should I update it? I think it is for all 5.* versions.

Process hangs after reaching set_time_limit() value.

After the script executes, the php process which processed it hangs and the CPU% used remains the same (no resources freeing).

Reproduce code:
---------------
<?php
   set_time_limit(30);

 while(1)
  {
       a_function();  
  } //Call to a function which doesn't affect the "time run" value for the script.
?>

Expected result:
----------------
I expect the script to finish executing after 30 seconds + time needed for the called (e.g. system call) function.

Actual result:
--------------
The script runs for 30 seconds, but if at the moment the 30 seconds interval passes the called funciton is executed (e.g. system call) - the process hangs (the interpreter hangs in that funciton)