Changes the base priority of a child process or thread in the current process.

#define INCL_DOSPROCESS
#include <os2.h>

ULONG     scope;    /*  The extent of the priority change. */
ULONG     ulClass;  /*  Priority class of a process. */
LONG      delta;    /*  Change to apply to the current base priority level of the process. */
ULONG     PorTid;   /*  A process identifier (scope == PRTYS_PROCESS or PRTYS_PROCESSTREE) or a thread identifier (scope == PRTYS_THREAD). */
APIRET    ulrc;     /*  Return Code. */

ulrc = DosSetPriority(scope, ulClass, delta,
         PorTid);