{"id":3490,"date":"2017-08-05T13:41:01","date_gmt":"2017-08-05T05:41:01","guid":{"rendered":"https:\/\/ixyzero.com\/blog\/?p=3490"},"modified":"2017-08-05T13:41:01","modified_gmt":"2017-08-05T05:41:01","slug":"linux%e4%b8%8bc%e8%af%ad%e8%a8%80%e4%b8%ad%e7%9a%84nice%e5%87%bd%e6%95%b0","status":"publish","type":"post","link":"https:\/\/ixyzero.com\/blog\/archives\/3490.html","title":{"rendered":"Linux\u4e0bC\u8bed\u8a00\u4e2d\u7684nice\u51fd\u6570"},"content":{"rendered":"

=Start=<\/p>\n

\u7f18\u7531\uff1a<\/h4>\n

\u5b66\u4e60\u9700\u8981<\/p>\n

\u6b63\u6587\uff1a<\/h4>\n

\u53c2\u8003\u89e3\u7b54\uff1a<\/h5>\n
\n
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#include <stdio.h>\u00a0\u00a0\u00a0\u00a0<\/code>\/* printf *\/<\/code><\/div>\n
#include <stdlib.h>\u00a0\u00a0\u00a0<\/code>\/* atoi, system, exit *\/<\/code><\/div>\n
#include <errno.h>\u00a0\u00a0\u00a0\u00a0<\/code>\/* errno *\/<\/code><\/div>\n
#include <string.h>\u00a0\u00a0\u00a0<\/code>\/* strerror *\/<\/code><\/div>\n
#include <unistd.h>\u00a0\u00a0\u00a0<\/code>\/* nice *\/<\/code><\/div>\n
<\/div>\n
int<\/code>\u00a0main(<\/code>int<\/code>\u00a0argc,\u00a0<\/code>char<\/code>\u00a0const<\/code>\u00a0*argv[])<\/code><\/div>\n
{<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>int<\/code>\u00a0adjustment =\u00a0<\/code>0<\/code>;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>if<\/code>\u00a0( argc >\u00a0<\/code>1<\/code>\u00a0) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>adjustment = atoi( argv[<\/code>1<\/code>] );<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>}<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>errno =\u00a0<\/code>0<\/code>;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>int<\/code>\u00a0ret;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>ret = nice( adjustment );<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>printf(\u00a0<\/code>\"nice(%d):%d\\n\"<\/code>, adjustment, ret );<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>if<\/code>\u00a0( -<\/code>1<\/code>\u00a0== ret && errno) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>if<\/code>\u00a0( errno == EACCES ) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>printf(\u00a0<\/code>\"Cannot set priority:%s.\/n\"<\/code>, strerror( errno ) );<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>exit(-<\/code>1<\/code>);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>}<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>}<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>sleep(<\/code>10<\/code>);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>system(<\/code>\"nice\"<\/code>);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>return<\/code>\u00a00<\/code>;<\/code><\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

&<\/p>\n

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$\u00a0<\/code>for<\/code>\u00a0i in {<\/code>1<\/code>..<\/code>5<\/code>};\u00a0<\/code>do<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>ps aux | grep --color\u00a0<\/code>\"a.out\"<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>sleep\u00a0<\/code>2<\/code><\/div>\n
done<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
\u53c2\u8003\u94fe\u63a5\uff1a<\/h5>\n

https:\/\/linux.die.net\/man\/3\/nice<\/a><\/p>\n

Linux C\u8bed\u8a00\u5e93\u51fd\u6570\u53c2\u8003 \u2014 nice
\nhttp:\/\/blog.csdn.net\/thinkerabc\/article\/details\/746764<\/a><\/p>\n

C\u8bed\u8a00nice()\u51fd\u6570\uff1a\u6539\u53d8\u8fdb\u7a0b\u4f18\u5148\u987a\u5e8f
\nhttp:\/\/c.biancheng.net\/cpp\/html\/283.html<\/a><\/p>\n

Difference between nice and setpriority in unix
\nhttps:\/\/stackoverflow.com\/questions\/7618291\/difference-between-nice-and-setpriority-in-unix<\/a><\/p>\n

=END=<\/p>\n","protected":false},"excerpt":{"rendered":"

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