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"Get/set program scheduling priority" - Metin KAYA - (2008-07-24 20:48:23) 
To get/set the priority of a process, getpriority(int which, int who) / setpriority(int which, int who, int prio) system calls can be used respectively (here is "prio" must be between -20 and 20). In order to use these sytem calls, "sys/time.h" and "sys/resource.h" header files have to be included.
For detailed information, it's recommended to see the call's man pages.
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