{"id":3822,"date":"2022-03-09T22:32:43","date_gmt":"2022-03-09T14:32:43","guid":{"rendered":"https:\/\/blog.coderfan.org\/?p=3822"},"modified":"2022-03-09T22:32:47","modified_gmt":"2022-03-09T14:32:47","slug":"android-or-linux-progress-threads-priority-set","status":"publish","type":"post","link":"https:\/\/blog.coderfan.org\/en\/android-or-linux-progress-threads-priority-set.html","title":{"rendered":"Android\u4e0eLinux\u7cfb\u7edf\u4e2d\u7ebf\u7a0b\/\u8fdb\u7a0b\u4f18\u5148\u7ea7\u8bbe\u5b9a"},"content":{"rendered":"
\n
\n \t<\/i> Read Time:<\/span>1 Minute, 54 Second <\/div>\n\n <\/div>\n

\u5728\u6b63\u6587\u5f00\u59cb\u4e4b\u524d\uff0c\u6211\u5e0c\u671b\u5927\u5bb6\u90fd\u80fd\u660e\u767d\u8fd9\u6837\u4e00\u4e2a\u9053\u7406\uff1a\u7cfb\u7edf\u8fd0\u884c\u65f6\uff0c\u5728\u6ca1\u6709\u4efb\u4f55\u5e72\u9884\u7684\u60c5\u51b5\u4e0b\uff0c\u5404\u4e2a\u8fdb\u7a0b\u83b7\u5f97CPU\u65f6\u95f4\u7247\u7684\u673a\u4f1a\u662f\u5747\u7b49\u7684\uff0c\u4e5f\u5c31\u662f\u8bf4\u5404\u4e2a\u8fdb\u7a0b\u83b7\u5f97\u7684CPU\u65f6\u95f4\u662f\u5747\u7b49\u7684\u3002\u4f46\u662f\uff0c\u6709\u7684\u8fdb\u7a0b\u76f8\u5bf9\u4e8e\u5176\u4ed6\u7684\u8fdb\u7a0b\u4f1a\u66f4\u91cd\u8981\u4e00\u4e9b\uff0c\u76f8\u5bf9\u6765\u8bf4\u4efb\u52a1\u4e5f\u53ef\u80fd\u66f4\u7e41\u91cd\u4e00\u4e9b\uff0c\u4e3a\u4e86\u4fdd\u8bc1\u8fd9\u4e9b\u4efb\u52a1\u6bd4\u8f83\u91cd\u3001\u76f8\u5bf9\u66f4\u91cd\u8981\u7684\u4e00\u4e9b\u8fdb\u7a0b\uff0c\u5c31\u6709\u4e86\u4f18\u5148\u7ea7\u8fd9\u4e2a\u6982\u5ff5\u3002\u901a\u8fc7\u63a7\u5236\u4f18\u5148\u7ea7\uff0c\u6211\u4eec\u53ef\u4ee5\u4fdd\u8bc1\u8fd9\u4e9b\u8fdb\u7a0b\u53ef\u4ee5\u66f4\u591a\u5730\u5360\u7528CPU\u65f6\u95f4\u7247\uff0c\u4ece\u800c\u4fdd\u8bc1\u8fd9\u4e9b\u8fdb\u7a0b\u7684\u8fd0\u884c\u3002<\/p>\n\n\n\n

\u5b9e\u9645\u4e0a\u5728\u6211\u4eec\u7684Unix\/Linux\u7cfb\u7edf\u5185\uff0c\u662f\u5b58\u5728\u8fdb\u7a0b\u8c03\u5ea6\u7ba1\u7406\u8fd9\u4e2a\u6982\u5ff5\u7684\u3002\u5728Linux\u5185\uff0c\u6240\u6709\u7684\u8fdb\u7a0b\u5927\u4f53\u4e0a\u53ef\u4ee5\u5206\u4e3a\u4e24\u4e2a\u8fdb\u7a0b\uff1a\u5373\u5b9e\u65f6\u8fdb\u7a0b\u4e0e\u975e\u5b9e\u65f6\u8fdb\u7a0b\u3002\u5b9e\u65f6\u8fdb\u7a0b\u5176\u5b9e\u662f\u5728\u5b9e\u65f6\u64cd\u4f5c\u7cfb\u7edf\u4e2d\u5f15\u7533\u51fa\u6765\u7684\u6982\u5ff5\uff0c\u8981\u6c42\u8fdb\u7a0b\u5728\u8f83\u77ed\u7684\u65f6\u95f4\u5185\u54cd\u5e94\uff0c\u4e0d\u4f1a\u5b58\u5728\u8f83\u957f\u5ef6\u65f6\uff08\u4e2d\u65ad\u3001\u8fdb\u7a0b\u5207\u6362\u7b49\uff09\u3002\u800c\u5728Linux\u7cfb\u7edf\u5185\uff0c\u4e5f\u662f\u6709\u5b9e\u65f6\u8fdb\u7a0b\u8fd9\u6837\u4e00\u4e2a\u6982\u5ff5\u7684\u3002\u4e3a\u4e86\u8868\u5f81\u8fd9\u4e9b\u5b9e\u65f6\u8fdb\u7a0b\uff0cLinux\u5185\u6838\u4e3a\u8fd9\u4e9b\u8fdb\u7a0b\u8bbe\u5b9a\u4e86\u4e00\u4e2a\u4f18\u5148\u7ea7\uff0c\u8303\u56f4\u4e3a0~99\uff0c\u800c\u975e\u5b9e\u65f6\u8fdb\u7a0b\uff0c\u5176\u4f18\u5148\u7ea7\u53d6\u503c\u8303\u56f4\u4e3a100 ~ 139\u3002\u5728\u6211\u4eec\u4f7f\u7528\u8bf8\u5982top\u547d\u4ee4\u6216\u8005ps\u547d\u4ee4\u67e5\u770b\u8fdb\u7a0b\u65f6\uff0c\u6211\u4eec\u4f1a\u6ce8\u610f\u5230\u4e24\u4e2a\u503c\uff0c\u4e00\u4e2a\u662fNI(nice)\uff0c\u4e00\u4e2a\u662fPR\/PRI\uff08Priority\uff09\uff0c\u8fd9\u4e24\u4e2a\u503c\u5176\u5b9e\u6709\u4e00\u4e2a\u5bf9\u5e94\u5173\u7cfb\uff0c\u5373\uff1aPriority=120+NICE<\/p>\n\n\n\n

\u5728\u6211\u4eec\u7684\u5b89\u5353\u7cfb\u7edf\u4e2d\uff0c\u6211\u4eec\u5185\u6838\u4e2d\u8fd0\u884c\u7684\u7a0b\u5e8f\u4f18\u5148\u7ea7\u5b9e\u9645\u4e0a\u5c31\u662f\u57280~99\u8fd9\u4e2a\u4f18\u5148\u7ea7\u8303\u56f4\u7684\u3002\u5728\u8fd9\u4e4b\u4e0a\uff0c\u662f\u7528\u6237\u6001\u7684\u8fdb\u7a0b\u3002\u800c\u7528\u6237\u6001\u7684\u8fdb\u7a0b\uff0c\u5c31\u53ef\u4ee5\u901a\u8fc7\u4fee\u6539Nice\u503c\u6765\u5f71\u54cd\u5176Priority\u503c\uff0c\u8fdb\u800c\u5f71\u54cd\u5230\u7a0b\u5e8f\u7684\u4f18\u5148\u7ea7\u3002\u5176\u4e2d\uff0cNICE\u503c\u7684\u53d6\u503c\u8303\u56f4\u662f-20 ~ 19\u3002\u5728\u5b89\u5353\u7cfb\u7edf\u4e2d\uff0c\u4fee\u6539\u8fdb\u7a0b\u7684\u4f18\u5148\u7ea7\u5b9e\u9645\u4e0a\u90fd\u662f\u901a\u8fc7\u4fee\u6539NICE\u503c\u6765\u5b9e\u73b0\u7684\u3002<\/p>\n\n\n\n

\u5728\u4e86\u89e3\u4ee5\u4e0a\u80cc\u666f\u540e\uff0c\u6211\u4eec\u6765\u4e86\u89e3\u5982\u4f55\u4fee\u6539\u8fdb\u7a0b\u4f18\u5148\u7ea7\u3002<\/p>\n\n\n\n

\u4fee\u6539Linux\u8fdb\u7a0b\u4f18\u5148\u7ea7<\/h4>\n\n\n\n

\u5b9e\u9645\u4e0a\u5728Linux\u7cfb\u7edf\u5185\uff0c\u662f\u4e0d\u533a\u5206\u8fdb\u7a0b\u4e0e\u7ebf\u7a0b\u7684\u3002\u6211\u4eec\u521b\u5efa\u7684\u7ebf\u7a0b\u6216\u8005\u8fdb\u7a0b\uff0c\u5728Linux\u5185\u90fd\u662f\u540c\u6837\u53bb\u5bf9\u5f85\u7684\u3002<\/p>\n\n\n\n

\u83b7\u53d6\u5f53\u524d\u7ebf\u7a0b\u8c03\u5ea6\u8bbe\u7f6e\u9879\uff1a\u9700\u8981#include <pthread.h>\u4e0e#include <sched.h>\u4e24\u4e2a\u5934\u6587\u4ef6<\/p>\n\n\n\n

int pthread_getschedparam(pthread_t thread, int *policy,struct sched_param *param);<\/p>\n\n\n\n

\u8bbe\u7f6e\u5f53\u524d\u7ebf\u7a0b\u8c03\u5ea6\u8bbe\u7f6e\u9879\uff1a<\/p>\n\n\n\n

int pthread_setschedparam(pthread_t thread, int policy,const struct sched_param *param);<\/p>\n\n\n\n

\u5173\u4e8e\u8fd4\u56de\u503c\uff1a\u5982\u679c\u51fd\u6570\u6267\u884c\u6210\u529f\uff0c\u8fd4\u56de\u503c\u4e3a0\uff0c\u53cd\u4e4b\u5219\u8868\u660e\u6267\u884c\u9519\u8bef\u3002\u4f7f\u7528strerror(errno)\u53ef\u4ee5\u77e5\u6089\u5177\u4f53\u7684\u9519\u8bef\u539f\u56e0\u3002<\/p>\n\n\n\n

\u53c2\u6570\u8be6\u89e3\uff1a<\/p>\n\n\n\n

pthread_t thread\uff1a\u53ef\u4ee5\u901a\u8fc7pthread_self(void<\/a>)\u51fd\u6570\u5feb\u6377\u83b7\u53d6pthread_t\u5bf9\u8c61<\/p>\n\n\n\n

policy\uff1a\u7ebf\u7a0b\u8c03\u5ea6\u7b56\u7565\uff0c\u5927\u4f53\u4e0a\u5206\u4e3a\u4e24\u7c7b\uff1a\u4e00\u7c7b\u662f\u5747\u8861\u8c03\u5ea6\u6a21\u5f0f\uff0c\u53e6\u4e00\u7c7b\u662f\u5b9e\u65f6\u8c03\u5ea6\u6a21\u5f0f\u3002<\/p>\n\n\n\n

\u5747\u8861\u8c03\u5ea6\u6a21\u5f0f<\/strong>\uff1apolicy\u7684\u53d6\u503c\u5982\u4e0b<\/p>\n\n\n\n

SCHED_OTHER<\/strong>\uff1a\u4e00\u822c\u7684Linux\u7cfb\u7edf\u90fd\u662f\u8fd9\u79cd\u7b56\u7565\uff0c\u6807\u51c6\u7684\u5faa\u73af\u5206\u65f6\u7b56\u7565\uff0c\u5747\u8861\u5206\u914d\u65f6\u95f4\u7247<\/p>\n\n\n\n

SCHED_BATCH<\/strong>\uff1a\u6d41\u5904\u7406\u5206\u65f6\u8c03\u5ea6\u7b56\u7565<\/p>\n\n\n\n

SCHED_IDLE<\/strong>\uff1a\u4e00\u822c\u7528\u4e8e\u8fd0\u884c\u4f18\u5148\u7ea7\u8f83\u4f4e\u7684\u540e\u53f0\u8fd0\u884c\u7684\u4efb\u52a1\u8c03\u5ea6<\/p>\n\n\n\n

\u5b9e\u65f6\u8c03\u5ea6\u6a21\u5f0f<\/strong>\uff1a\u4f1a\u6839\u636e\u7cfb\u7edf\u53d8\u5316\u7684\u72b6\u6001\u8fdb\u884c\u8c03\u5ea6\u7b56\u7565\u7684\u8c03\u6574<\/p>\n\n\n\n

SCHED_FIFO<\/strong>:\u5148\u8fdb\u5148\u51fa\u7b56\u7565\uff0c\u4f9d\u636e\u7ebf\u7a0b<\/p>\n\n\n\n

SCHED_RR<\/strong>:\u662fSCHED_FIFO\u7684\u589e\u5f3a\u7248\u7b56\u7565\uff0c\u5177\u6709\u66f4\u597d\u7684\u5b9e\u7528\u6027<\/p>\n\n\n\n

param\uff1a\u6307\u5411\u7ed3\u6784\u4f53struct sched_param\u7684\u6307\u9488\uff0cstruct sched_param\u7684\u5185\u5bb9\u5982\u4e0b\uff1a<\/p>\n\n\n\n

struct sched_param {<\/p>\n\n\n\n

    int sched_priority;     \/* Scheduling priority *\/<\/p>\n\n\n\n

};<\/p>\n\n\n\n

\u5176\u4e2dpriority\u610f\u6307\u5177\u4f53\u7684\u4f18\u5148\u7ea7\u3002\u5728\u5747\u8861\u8c03\u5ea6\u6a21\u5f0f\u4e0b\uff0csched_priority\u7684\u503c\u53ea\u80fd\u4e3a0\u503c\uff0c\u800c\u5728policy\u4e3aSCHED_FIFO\u548cSCHED_RR\u65f6\uff0c\u5176\u503c\u53d6\u503c\u8303\u56f4\u4e3a1~99\uff0c\u503c\u8d8a\u5927\u4f18\u5148\u7ea7\u8d8a\u9ad8\u3002<\/p>\n\n\n\n

\u9644\u4e0a\u4e00\u6bb5\u4ee3\u7801\uff0c\u4e86\u89e3\u4e00\u4e0b\u5982\u4f55\u4f7f\u7528\u8fd9\u4e24\u4e2aAPI:<\/p>\n\n\n\n

\/\/Get current thread policy\r\nint policy = SCHED_RR;\r\nsched_param sch_params;\r\nsch_params.sched_priority = 20;\r\n\/\/\u62f7\u8d1d\u6784\u9020\uff0cdrawThread\u4e3a\u51fd\u6570\u5faa\u73af\u4f53\r\nstd::thread drawThreadObj(&EvsRenderManager::drawThread, this);\r\nALOGI(\"pthread_setschedparam,policy->%d,priority->%d\", policy, sch_params.sched_priority);\r\npthread_setschedparam(drawThreadObj.native_handle(), policy, &sch_params);\r\ndrawThreadObj.detach();\r\npthread_getschedparam(drawThreadObj.native_handle(), &policy, &sch_params);\r\n\/\/Get current policy corresponding prioriuty,normal range from 1~99\r\nint priority_max = sched_get_priority_max(policy);\r\n\/\/Get current policy corresponding prioriuty,normal range from 1~99\r\nint priority_min = sched_get_priority_min(policy);\r\nALOGI(\"drawThread priority is %d,max priority is %d,min priority is %d,policy is %d\", sch_params.sched_priority,priority_max, priority_min, policy);\r\n<\/code><\/pre>\n\n\n\n
\u8fd9\u91cc\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5728\u5b89\u5353\u7cfb\u7edf\u5185\u662f\u6ca1\u6709\u5b9e\u73b0 SCHED_FIFO<\/strong> \u4e0e SCHED_RR<\/strong> \u8fd9\u4e24\u4e2a\u8c03\u5ea6\u7b56\u7565\u7684\uff0c\u6240\u4ee5\u5728\u5b89\u5353\u7cfb\u7edf\u5185\u4fee\u6539\u8fdb\u7a0b\u4f18\u5148\u7ea7\u53ea\u80fd\u4fee\u6539\u7528\u6237\u6001\u7684\u8fdb\u7a0b\uff0c\u4e14\u53ea\u80fd\u901a\u8fc7\u4fee\u6539NICE\u503c\u6765\u8fdb\u884c\u4fee\u6539\u3002<\/p>\n\n\n\n
\u4fee\u6539Android\u8fdb\u7a0b\u4f18\u5148\u7ea7<\/h4>\n\n\n\n
\u4f7f\u7528setPriority\u4e0egetPriority\u8fdb\u884c\u4f18\u5148\u7ea7\u7684\u8bbe\u7f6e\u4e0e\u68c0\u6d4b,\u4f7f\u7528\u8fd9\u4e24\u4e2aAPI\u9700\u8981\u5f15\u7528\u5934\u6587\u4ef6<sys\/resources.h>.<\/p>\n\n\n\n
int setpriority(int which, id_t who, int nice);<\/p>\n\n\n\n
int getpriority(int which, int who);<\/p>\n\n\n\n
\u53c2\u6570\u89e3\u8bfb\uff1a<\/p>\n\n\n\n
int which<\/strong>\uff1a\u6307\u9700\u8981\u4fee\u6539\u4f18\u5148\u7ea7\u7684\u5bf9\u8c61\u6240\u5c5e\u7c7b\u522b\uff0c\u8fd9\u91cc\u652f\u6301\u4e09\u4e2a\u7c7b\u522b,\u5206\u522b\u662f\uff1aPRIO_PROCESS\uff08\u4ee3\u8868\u67d0\u4e2a\u5177\u4f53\u8fdb\u7a0b\uff09\u3001PRIO_PGRP\uff08\u4ee3\u8868\u67d0\u4e2a\u8fdb\u7a0b\u7ec4\uff09\u3001PRIO_USER\uff08\u4ee3\u8868\u67d0\u4e2a\u5177\u4f53\u7684USER\uff0c\u4ee5user id\u8fdb\u884c\u533a\u5206\uff09<\/p>\n\n\n\n
id_t who<\/strong>\uff1a\u6307\u5728\u4e0a\u8ff0\u4e09\u79cd\u7c7b\u522b\u4e0b\u7684\u5177\u4f53\u7684\u503c\uff0c\u5982which\u4e3aPRIO_PROCESS\u5219who\u5c31\u662f\u5177\u4f53\u7684\u8fdb\u7a0bid\uff0c\u5982which\u4e3aPRIO_PGRP\uff0c\u5219who\u5c31\u662f\u5177\u4f53\u7684\u8fdb\u7a0b\u7ec4id\uff0c\u5982which\u4e3aPRIO_USER\uff0c\u5219who\u5c31\u662f\u5177\u4f53\u7684user id\u3002<\/p>\n\n\n\n
int nice\uff1a<\/strong>\u8bbe\u5b9a\u5177\u4f53\u7684\u8fdb\u7a0bnice\u503c\u3002\u8fd9\u91cc\u4e0epthread_setschedparam\u4e0d\u540c\u7684\u662f\uff0c\u8fd9\u91cc\u662f\u901a\u8fc7nice\u503c\u4fee\u6539\u7684\u4f18\u5148\u7ea7\uff0c\u800cnice\u503c\u7684\u53d6\u503c\u8303\u56f4\u4e3a-20~19\u3002<\/p>\n\n\n\n
\u4ee5\u4e0a\u5c31\u662f\u8fd9\u7bc7\u535a\u6587\u7684\u5168\u90e8\u5185\u5bb9\u5566\uff0c\u5173\u4e8e\u8fd9\u90e8\u5206\u7684\u66f4\u591a\u8d44\u6599\uff0c\u53ef\u4ee5\u53c2\u8003\u8c37\u6b4c\u5b98\u65b9\u6587\u6863\u4ee5\u53caLinux\u5185\u6838\u7684\u6587\u6863\uff0c\u5e0c\u671b\u80fd\u591f\u5e2e\u52a9\u5230\u5927\u5bb6~<\/p>\n        
\n            
\n                \n                
\n                    \n                        \"Happy\"\n                    <\/a>\n                    
\n                        Happy                    <\/div>\n                    
\n                                                    0<\/span>\n                        \n                                                0<\/span> %<\/span>\n                                            <\/div>\n                <\/div>\n\n                
\n                    \n                        \"Sad\"\n                    <\/a>\n                    
\n                        Sad                    <\/div>\n                    
\n                                                    0<\/span>\n                                                                        0<\/span> %<\/span>\n                                            <\/div>\n                <\/div>\n\n                
\n                    \n                        \"Excited\"\n                    <\/a>\n                    
\n                        Excited                    <\/div>\n                    
\n                                                    0<\/span>\n                                                                        0<\/span> %<\/span>\n                                            <\/div>\n                <\/div>\n\n                
\n                    \n                        \"Sleepy\"\n                    <\/a>\n                    
\n                        Sleepy                    <\/div>\n                    
\n                                                    0<\/span>\n                        \n                                                0<\/span> %<\/span>\n                                            <\/div>\n                <\/div>\n\n                
\n                    \n                        \"Angry\"\n                    <\/a>\n                    
Angry<\/div>\n                    
\n                                                    0<\/span>\n                                                                        0<\/span> %<\/span>\n                        \n                    <\/div>\n                <\/div>\n\n                
\n                    \n                        \"Surprise\"\n                    <\/a>\n                    
Surprise<\/div>\n                    
\n                                                    0<\/span>\n                                                                        0<\/span> %<\/span>\n                                            <\/div>\n                <\/div>\n\n            <\/div>\n        <\/div>","protected":false},"excerpt":{"rendered":"
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