{"id":1335,"date":"2018-06-04T23:23:15","date_gmt":"2018-06-04T15:23:15","guid":{"rendered":"https:\/\/damogame.cn:15443\/wordpress\/?p=1335"},"modified":"2018-06-04T23:23:15","modified_gmt":"2018-06-04T15:23:15","slug":"c11%e4%b8%ad%e7%9a%84%e5%8e%9f%e5%ad%90%e6%93%8d%e4%bd%9c%ef%bc%88atomic-operation%ef%bc%89","status":"publish","type":"post","link":"https:\/\/i007.cc\/wordpress\/archives\/1335","title":{"rendered":"C++11\u4e2d\u7684\u539f\u5b50\u64cd\u4f5c\uff08atomic operation\uff09"},"content":{"rendered":"
\n

C++11\u4e2d\u7684\u539f\u5b50\u64cd\u4f5c\uff08atomic operation\uff09<\/h1>\n<\/div>\n
\n
2013\u5e7404\u670823\u65e5 10:57:49<\/span><\/p>\n
\u9605\u8bfb\u6570\uff1a43029<\/span><\/div>\n<\/div>\n<\/div>\n
\n
\n
\n

\u6240\u8c13\u7684\u539f\u5b50\u64cd\u4f5c\uff0c\u53d6\u7684\u5c31\u662f\u201c\u539f\u5b50\u662f\u6700\u5c0f\u7684\u3001\u4e0d\u53ef\u5206\u5272\u7684\u6700\u5c0f\u4e2a\u4f53\u201d\u7684\u610f\u4e49\uff0c\u5b83\u8868\u793a\u5728\u591a\u4e2a\u7ebf\u7a0b\u8bbf\u95ee\u540c\u4e00\u4e2a\u5168\u5c40\u8d44\u6e90\u7684\u65f6\u5019\uff0c\u80fd\u591f\u786e\u4fdd\u6240\u6709\u5176\u4ed6\u7684\u7ebf\u7a0b\u90fd\u4e0d\u5728\u540c\u4e00\u65f6\u95f4\u5185\u8bbf\u95ee\u76f8\u540c\u7684\u8d44\u6e90\u3002\u4e5f\u5c31\u662f\u4ed6\u786e\u4fdd\u4e86\u5728\u540c\u4e00\u65f6\u523b\u53ea\u6709\u552f\u4e00\u7684\u7ebf\u7a0b\u5bf9\u8fd9\u4e2a\u8d44\u6e90\u8fdb\u884c\u8bbf\u95ee\u3002\u8fd9\u6709\u70b9\u7c7b\u4f3c\u4e92\u65a5\u5bf9\u8c61\u5bf9\u5171\u4eab\u8d44\u6e90\u7684\u8bbf\u95ee\u7684\u4fdd\u62a4\uff0c\u4f46\u662f\u539f\u5b50\u64cd\u4f5c\u66f4\u52a0\u63a5\u8fd1\u5e95\u5c42\uff0c\u56e0\u800c\u6548\u7387\u66f4\u9ad8\u3002<\/p>\n

\u5728\u4ee5\u5f80\u7684C++\u6807\u51c6\u4e2d\u5e76\u6ca1\u6709\u5bf9\u539f\u5b50\u64cd\u4f5c\u8fdb\u884c\u89c4\u5b9a\uff0c\u6211\u4eec\u5f80\u5f80\u662f\u4f7f\u7528\u6c47\u7f16\u8bed\u8a00\uff0c\u6216\u8005\u662f\u501f\u52a9\u7b2c\u4e09\u65b9\u7684\u7ebf\u7a0b\u5e93\uff0c\u4f8b\u5982intel\u7684pthread\u6765\u5b9e\u73b0\u3002\u5728\u65b0\u6807\u51c6C++11\uff0c\u5f15\u5165\u4e86\u539f\u5b50\u64cd\u4f5c\u7684\u6982\u5ff5\uff0c\u5e76\u901a\u8fc7\u8fd9\u4e2a\u65b0\u7684\u5934\u6587\u4ef6\u63d0\u4f9b\u4e86\u591a\u79cd\u539f\u5b50\u64cd\u4f5c\u6570\u636e\u7c7b\u578b\uff0c\u4f8b\u5982\uff0catomic_bool,atomic_int\u7b49\u7b49\uff0c\u5982\u679c\u6211\u4eec\u5728\u591a\u4e2a\u7ebf\u7a0b\u4e2d\u5bf9\u8fd9\u4e9b\u7c7b\u578b\u7684\u5171\u4eab\u8d44\u6e90\u8fdb\u884c\u64cd\u4f5c\uff0c\u7f16\u8bd1\u5668\u5c06\u4fdd\u8bc1\u8fd9\u4e9b\u64cd\u4f5c\u90fd\u662f\u539f\u5b50\u6027\u7684\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u786e\u4fdd\u4efb\u610f\u65f6\u523b\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b\u5bf9\u8fd9\u4e2a\u8d44\u6e90\u8fdb\u884c\u8bbf\u95ee\uff0c\u7f16\u8bd1\u5668\u5c06\u4fdd\u8bc1\uff0c\u591a\u4e2a\u7ebf\u7a0b\u8bbf\u95ee\u8fd9\u4e2a\u5171\u4eab\u8d44\u6e90\u7684\u6b63\u786e\u6027\u3002\u4ece\u800c\u907f\u514d\u4e86\u9501\u7684\u4f7f\u7528\uff0c\u63d0\u9ad8\u4e86\u6548\u7387\u3002<\/p>\n

\u6211\u4eec\u8fd8\u662f\u6765\u770b\u4e00\u4e2a\u5b9e\u9645\u7684\u4f8b\u5b50\u3002\u5047\u82e5\u6211\u4eec\u8981\u8bbe\u8ba1\u4e00\u4e2a\u5e7f\u544a\u70b9\u51fb\u7edf\u8ba1\u7a0b\u5e8f\uff0c\u5728\u670d\u52a1\u5668\u7a0b\u5e8f\u4e2d\uff0c\u4f7f\u7528\u591a\u4e2a\u7ebf\u7a0b\u6a21\u62df\u591a\u4e2a\u7528\u6237\u5bf9\u5e7f\u544a\u7684\u70b9\u51fb\uff1a<\/p>\n

#include <boost\/thread\/thread.hpp>
\n#include <atomic>
\n#include <iostream>
\n#include <time.h><\/p>\n

using namespace std;
\n\/\/ \u5168\u5c40\u7684\u7ed3\u679c\u6570\u636e
\nlong total = 0;<\/p>\n

\/\/ \u70b9\u51fb\u51fd\u6570
\nvoid click()
\n{
\nfor(int i=0; i<1000000;++i)
\n{
\n\/\/ \u5bf9\u5168\u5c40\u6570\u636e\u8fdb\u884c\u65e0\u9501\u8bbf\u95ee
\ntotal += 1;
\n}
\n}<\/p>\n

int main(int argc, char* argv[])
\n{
\n\/\/ \u8ba1\u65f6\u5f00\u59cb
\nclock_t start = clock();
\n\/\/ \u521b\u5efa100\u4e2a\u7ebf\u7a0b\u6a21\u62df\u70b9\u51fb\u7edf\u8ba1
\nboost::thread_group threads;
\nfor(int i=0; i<100;++i)
\n{
\nthreads.create_thread(click);
\n}<\/p>\n

threads.join_all();
\n\/\/ \u8ba1\u65f6\u7ed3\u675f
\nclock_t finish = clock();
\n\/\/ \u8f93\u51fa\u7ed3\u679c
\ncout<<“result:”<<total<<endl;
\ncout<<“duration:”<<finish -start<<“ms”<<endl;
\nreturn 0;
\n}<\/p>\n

\u4ece\u6267\u884c\u7684\u7ed3\u679c\u6765\u770b\uff0c\u8fd9\u6837\u7684\u65b9\u6cd5\u867d\u7136\u975e\u5e38\u5feb\uff0c\u4f46\u662f\u7ed3\u679c\u4e0d\u6b63\u786e
\nE:\\SourceCode\\MinGW>thread.exe
\nresult:87228026
\nduration:528ms<\/p>\n

\u5f88\u81ea\u7136\u5730\uff0c\u6211\u4eec\u4f1a\u60f3\u5230\u4f7f\u7528\u4e92\u65a5\u5bf9\u8c61\u6765\u5bf9\u5168\u5c40\u5171\u4eab\u8d44\u6e90\u7684\u8bbf\u95ee\u8fdb\u884c\u4fdd\u62a4\uff0c\u4e8e\u662f\u6709\u4e86\u4e0b\u9762\u7684\u5b9e\u73b0\uff1a<\/p>\n

long total = 0;
\n\/\/ \u5bf9\u5171\u4eab\u8d44\u6e90\u8fdb\u884c\u4fdd\u62a4\u7684\u4e92\u65a5\u5bf9\u8c61
\nmutex m;<\/p>\n

void click()
\n{
\nfor(int i=0; i<1000000;++i)
\n{
\n\/\/ \u8bbf\u95ee\u4e4b\u524d\uff0c\u9501\u5b9a\u4e92\u65a5\u5bf9\u8c61
\nm.lock();
\ntotal += 1;
\n\/\/ \u8bbf\u95ee\u5b8c\u6210\u540e\uff0c\u91ca\u653e\u4e92\u65a5\u5bf9\u8c61
\nm.unlock();
\n}
\n}
\n\u4e92\u65a5\u5bf9\u8c61\u7684\u4f7f\u7528\uff0c\u4fdd\u8bc1\u4e86\u540c\u4e00\u65f6\u523b\u53ea\u6709\u552f\u4e00\u7684\u4e00\u4e2a\u7ebf\u7a0b\u5bf9\u8fd9\u4e2a\u5171\u4eab\u8fdb\u884c\u8bbf\u95ee\uff0c\u4ece\u6267\u884c\u7684\u7ed3\u679c\u6765\u770b\uff0c\u4e92\u65a5\u5bf9\u8c61\u4fdd\u8bc1\u4e86\u7ed3\u679c\u7684\u6b63\u786e\u6027\uff0c\u4f46\u662f\u4e5f\u6709\u975e\u5e38\u5927\u7684\u6027\u80fd\u635f\u5931\uff0c\u4ece\u521a\u624d\u7684528ms\u53d8\u6210\u4e86\u73b0\u5728\u76848431\uff0c\u7528\u4e86\u539f\u6765\u65f6\u95f4\u768410\u591a\u500d\u7684\u65f6\u95f4\u3002\u8fd9\u4e2a\u635f\u5931\u591f\u5927\u3002
\nE:\\SourceCode\\MinGW>thread.exe
\nresult:100000000
\nduration:8431ms<\/p>\n

\u5982\u679c\u662f\u5728C++11\u4e4b\u524d\uff0c\u6211\u4eec\u7684\u89e3\u51b3\u65b9\u6848\u4e5f\u5c31\u5230\u6b64\u4e3a\u6b62\u4e86\uff0c\u4f46\u662f\uff0cC++\u5bf9\u6027\u80fd\u7684\u8ffd\u6c42\u662f\u6c38\u65e0\u6b62\u5883\u7684\uff0c\u4ed6\u603b\u662f\u60f3\u5c3d\u4e00\u5207\u529e\u6cd5\u69a8\u5e72CPU\u7684\u6027\u80fd\u3002\u5728C++11\u4e2d\uff0c\u5b9e\u73b0\u4e86\u539f\u5b50\u64cd\u4f5c\u7684\u6570\u636e\u7c7b\u578b\uff08atomic_bool,atomic_int,atomic_long\u7b49\u7b49\uff09\uff0c\u5bf9\u4e8e\u8fd9\u4e9b\u539f\u5b50\u6570\u636e\u7c7b\u578b\u7684\u5171\u4eab\u8d44\u6e90\u7684\u8bbf\u95ee\uff0c\u65e0\u9700\u501f\u52a9mutex\u7b49\u9501\u673a\u5236\uff0c\u4e5f\u80fd\u591f\u5b9e\u73b0\u5bf9\u5171\u4eab\u8d44\u6e90\u7684\u6b63\u786e\u8bbf\u95ee\u3002<\/p>\n

\/\/ \u5f15\u5165\u539f\u5b50\u6570\u636e\u7c7b\u578b\u7684\u5934\u6587\u4ef6
\n#include <atomic><\/p>\n

\/\/ \u7528\u539f\u5b50\u6570\u636e\u7c7b\u578b\u4f5c\u4e3a\u5171\u4eab\u8d44\u6e90\u7684\u6570\u636e\u7c7b\u578b
\natomic_long total(0);
\n\/\/long total = 0;<\/p>\n

void click()
\n{
\nfor(int i=0; i<1000000;++i)
\n{
\n\/\/ \u4ec5\u4ec5\u662f\u6570\u636e\u7c7b\u578b\u7684\u4e0d\u540c\u800c\u4ee5\uff0c\u5bf9\u5176\u7684\u8bbf\u95ee\u5f62\u5f0f\u4e0e\u666e\u901a\u6570\u636e\u7c7b\u578b\u7684\u8d44\u6e90\u5e76\u65e0\u533a\u522b
\ntotal += 1;
\n}
\n}<\/p>\n

\u6211\u4eec\u6765\u770b\u770b\u4f7f\u7528\u539f\u5b50\u6570\u636e\u7c7b\u578b\u4e4b\u540e\u7684\u6548\u679c\u5982\u4f55\uff1a
\nE:\\SourceCode\\MinGW>thread.exe
\nresult:100000000
\nduration:2105ms<\/p>\n

\u7ed3\u679c\u6b63\u786e\uff01\u8017\u65f6\u53ea\u662f\u4f7f\u7528mutex\u4e92\u65a5\u5bf9\u8c61\u7684\u56db\u5206\u4e4b\u4e00\uff01\u4e5f\u4ec5\u4ec5\u662f\u4e0d\u91c7\u7528\u4efb\u4f55\u4fdd\u62a4\u673a\u5236\u7684\u65f6\u95f4\u76844\u500d\u3002\u53ef\u4ee5\u8bf4\u8fd9\u662f\u4e00\u4e2a\u975e\u5e38\u4e0d\u9519\u7684\u6210\u7ee9\u4e86\u3002<\/p>\n

\u539f\u5b50\u64cd\u4f5c\u7684\u5b9e\u73b0\u8ddf\u666e\u901a\u6570\u636e\u7c7b\u578b\u7c7b\u4f3c\uff0c\u4f46\u662f\u5b83\u80fd\u591f\u5728\u4fdd\u8bc1\u7ed3\u679c\u6b63\u786e\u7684\u524d\u63d0\u4e0b\uff0c\u63d0\u4f9b\u6bd4mutex\u7b49\u9501\u673a\u5236\u66f4\u597d\u7684\u6027\u80fd\uff0c\u5982\u679c\u6211\u4eec\u8981\u8bbf\u95ee\u7684\u5171\u4eab\u8d44\u6e90\u53ef\u4ee5\u7528\u539f\u5b50\u6570\u636e\u7c7b\u578b\u8868\u793a\uff0c\u90a3\u4e48\u5728\u591a\u7ebf\u7a0b\u7a0b\u5e8f\u4e2d\u4f7f\u7528\u8fd9\u79cd\u65b0\u7684\u7b49\u4ef7\u6570\u636e\u7c7b\u578b\uff0c\u662f\u4e00\u4e2a\u4e0d\u9519\u7684\u9009\u62e9\u3002<\/p>\n

\u3010\u8f6c\u81ea\uff1ahttp:\/\/imcc.blogbus.com\/logs\/179131763.html\u3011<\/p>\n<\/div>\n<\/div>\n<\/article>\n

\n
\u4e2a\u4eba\u5206\u7c7b\uff1a<\/span>\u00a0C\/C++<\/a><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

C++11\u4e2d\u7684\u539f\u5b50\u64cd\u4f5c\uff08atomic o<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_container_layout":"default_layout","colormag_page_sidebar_layout":"default_layout","footnotes":""},"categories":[],"tags":[118],"class_list":["post-1335","post","type-post","status-publish","format-standard","hentry","tag-02-"],"_links":{"self":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts\/1335","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/comments?post=1335"}],"version-history":[{"count":0,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts\/1335\/revisions"}],"wp:attachment":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/media?parent=1335"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/categories?post=1335"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/tags?post=1335"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}