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缘由：
学习需要
正文：
参考解答：
#include <stdio.h> /* printf */#include <stdlib.h> /* atoi, system, exit */#include <errno.h> /* errno */#include <string.h> /* strerror */#include <unistd.h> /* nice */int main(int argc, char const *argv[]){ int adjustment = 0; if ( argc > 1 ) { adjustment = atoi( argv[1] ); } errno = 0; int ret; ret = nice( adjustment ); printf( "nice(%d):%d\n", adjustment, ret ); if ( -1 == ret && errno) { if ( errno == EACCES ) { printf( "Cannot set priority:%s./n", strerror( errno ) ); exit(-1); } } sleep(10); system("nice"); return 0;} |
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$ for i in {1..5}; do ps aux | grep --color "a.out" sleep 2done |
参考链接：
https://linux.die.net/man/3/nice
Linux C语言库函数参考 — nice
http://blog.csdn.net/thinkerabc/article/details/746764
C语言nice()函数：改变进程优先顺序
http://c.biancheng.net/cpp/html/283.html
Difference between nice and setpriority in unix
https://stackoverflow.com/questions/7618291/difference-between-nice-and-setpriority-in-unix
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