getpriority(2)-Linux man page Name getpriority,setpriority-get/set program scheduling priority Synopsis #include <sys/time.h> #include <sys/resource.h> int getpriority(int which,int who); int setpriority(int which,int who,int prio); Description The scheduling priority of the process,process group,or user,as indicated by which and who is obtained with the getpriority()call and set with the setpriority()call. The value which is one of PRIO_PROCESS,PRIO_PGRP,or PRIO_USER,and who is interpreted relative to which(a process identifier for PRIO_PROCESS,process group identifier for PRIO_PGRP,and a user ID for PRIO_USER).A zero value for who denotes(respectively)the calling process,the process group of the calling process,or the real user ID of the calling process.Prio is a value in the range-20 to 19(but see the Notes below).The default priority is 0;lower priorities cause more favorable scheduling The getpriority()call returns the highest priority(lowest numerical value)enjoyed by 弋系统实验室 20 any of the specified processes.The setpriority()call sets the priorities of all of the specified processes to the specified value.Only the superuser may lower priorities. SYSTEM LABORATORY TE FOR AOVANCED STUOY DF USTC2023/7/14 Linux操作系统分析 10/52 又如