{"id":3477,"date":"2021-06-26T18:06:44","date_gmt":"2021-06-26T10:06:44","guid":{"rendered":"https:\/\/wyxxt.org.cn\/?p=3477"},"modified":"2023-12-04T15:18:51","modified_gmt":"2023-12-04T07:18:51","slug":"go%e8%af%ad%e8%a8%80%e5%ae%9e%e7%8e%b0%e9%94%81","status":"publish","type":"post","link":"https:\/\/wyxxt.org.cn\/?p=3477","title":{"rendered":"go\u8bed\u8a00\u5b9e\u73b0\u9501"},"content":{"rendered":"<h2>\u4e3a\u4ec0\u4e48\u52a0\u9501<\/h2>\n<p>\u5b89\u5168\u95ee\u9898<br \/>\n\u7a0b\u5e8f\u5e76\u53d1\u6216\u5e76\u884c\u65f6\uff0c\u5bf9\u5168\u5c40\u53d8\u91cf\u7684\u4fee\u6539\u9700\u8981\u52a0\u9501\uff0c\u4fdd\u8bc1\u4e32\u884c\u5316\u3002<\/p>\n<h2>\u9501\u7684\u7f3a\u70b9<\/h2>\n<p>\u672a\u62a2\u5230\u9501\u7684\u7a0b\u5e8f\uff08\u8fdb\u7a0b\uff0c\u7ebf\u7a0b\uff0c\u534f\u7a0b\uff09\u4e0d\u505c\u7684\u5c1d\u8bd5\u62a2\u9501\uff0ccpu\u5360\u7528\u5f88\u9ad8<br \/>\n\u8fd9\u79cd\u60c5\u51b5\u53c8\u88ab\u79f0\u4e3a\u81ea\u65cb\u9501\uff0cCAS\uff0c\u8f7b\u91cf\u7ea7\u9501<br \/>\n\u81ea\u65cb\u9501\u9002\u7528\u4e8e\u5e76\u53d1\u91cf\u4f4e\u4e14\u7a0b\u5e8f\u6267\u884c\u65f6\u95f4\u77ed\u7684\u60c5\u51b5\u4e0b<\/p>\n<p>\u672a\u62a2\u5230\u9501\u7684\u7a0b\u5e8f\u8fdb\u5165\u7b49\u5f85\u961f\u5217\uff0c\u6548\u7387\u8f83CAS\u4f4e<br \/>\n\u8fd9\u79cd\u60c5\u51b5\u53c8\u88ab\u79f0\u4e3a\u91cd\u91cf\u7ea7\u9501<br \/>\n\u9002\u7528\u4e8e\u9ad8\u5e76\u53d1\u573a\u666f<\/p>\n<p>\u5728JAVA\u4e2dsynchronized\u6709\u9501\u5347\u7ea7\u7684\u8fc7\u7a0b\uff0c\u504f\u5411\u9501->\u81ea\u65cb\u9501->\u91cd\u91cf\u7ea7\u9501<br \/>\ngo\u8bed\u8a00Mutex\u4e5f\u6709\u6b64\u7c7b\u4f3c\u8fc7\u7a0b<\/p>\n<h2>\u9501\u7684\u4e24\u79cd\u60c5\u51b5<\/h2>\n<p>\u8fdb\u7a0b\u5185\u9501\u548c\u96c6\u7fa4\u5185\u9501<\/p>\n<h3>\u8fdb\u7a0b\u5185\u52a0\u9501<\/h3>\n<h4>Mutex\u5b9e\u73b0<\/h4>\n<pre><code class=\"language-go line-numbers\">package main\n\nimport \"sync\"\n\nvar counter int\nvar l sync.Mutex\n\nfunc incr() {\n    l.Lock()\n    counter++\n    l.Unlock()\n}\nfunc main() {\n    var wg sync.WaitGroup\n    for i := 0; i &lt; 1000; i++ {\n        wg.Add(1)\n        go func() {\n            defer wg.Done()\n            incr()\n        }()\n    }\n    wg.Wait()\n    println(counter)\n}\n<\/code><\/pre>\n<h4>chan\u5b9e\u73b0<\/h4>\n<pre><code class=\"language-go line-numbers\">package main\n\nimport \"sync\"\n\ntype Lock struct {\n    c chan struct{}\n}\n\nfunc NewLock() Lock {\n    var l Lock\n    l.c = make(chan struct{}, 1)\n    l.c &lt;- struct{}{}\n    return l\n}\nfunc (l Lock) Lock() bool {\n    lockResult := false\n    select {\n    case &lt;-l.c:\n        lockResult = true\n    default:\n    }\n    return lockResult\n}\nfunc (l Lock) UnLock() {\n    l.c &lt;- struct{}{}\n}\n\nvar counter int\n\nvar l = NewLock()\n\nfunc incr() {\n    if !l.Lock() {\n        incr()\n        return\n    }\n    counter++\n    l.UnLock()\n}\n\nfunc main() {\n    var wg sync.WaitGroup\n\n    for i := 0; i &lt; 1000; i++ {\n        wg.Add(1)\n        go func() {\n            defer wg.Done()\n            incr()\n        }()\n    }\n    wg.Wait()\n    println(counter)\n}\n\n<\/code><\/pre>\n<h3>\u96c6\u7fa4\u5185\u52a0\u9501<\/h3>\n<p>\u5206\u5e03\u5f0f\u7cfb\u7edf<\/p>\n<h4>Redis\u7684setnx<\/h4>\n<pre><code class=\"language-go line-numbers\">package main\n\nimport (\n    \"fmt\"\n    \"sync\"\n    \"time\"\n\n    \"github.com\/go-redis\/redis\"\n)\n\nvar client *redis.Client\n\nfunc init() {\n    c := redis.NewClient(&amp;redis.Options{\n        Addr:     \"node01:6379\",\n        Password: \"\",\n        DB:       0,\n        PoolSize: 100,\n    })\n    client = c\n}\n\nfunc incr() {\n\n    var lockKey = \"counter_lock\"\n    var counterKey = \"counter\"\n\n    resp := client.SetNX(lockKey, 1, time.Second*5)\n    lockSuccess, err := resp.Result()\n    if err != nil || !lockSuccess {\n        fmt.Println(err, \"lock result: \", lockSuccess)\n        \/\/incr()\n        return\n    }\n    getResp := client.Get(counterKey)\n    cntValue, err := getResp.Int64()\n    if err == nil || err == redis.Nil {\n        cntValue++\n        resp := client.Set(counterKey, cntValue, 0)\n        _, err := resp.Result()\n        if err != nil {\n            panic(\"set value error!\")\n        }\n    }\n    delResp := client.Del(lockKey)\n    unlockSuccess, err := delResp.Result()\n    if err == nil &amp;&amp; unlockSuccess &gt; 0 {\n    } else {\n        panic(\"unlock failed\")\n\n    }\n}\n\nfunc main() {\n    var wg sync.WaitGroup\n    for i := 0; i &lt; 1000; i++ {\n        wg.Add(1)\n        go func() {\n            defer wg.Done()\n            incr()\n        }()\n    }\n    wg.Wait()\n    getResp := client.Get(\"counter\")\n    cntValue, err := getResp.Int64()\n    if err == nil || err == redis.Nil {\n        println(cntValue)\n    }\n}\n<\/code><\/pre>\n<h4>\u57fa\u4e8eZooKeeper<\/h4>\n<pre><code class=\"language-go line-numbers\">package main\n\nimport (\n    \"sync\"\n    \"time\"\n\n    \"github.com\/go-zookeeper\/zk\"\n)\n\nvar counter int\nvar c *zk.Conn\n\nfunc init() {\n    conn, _, err := zk.Connect([]string{\"node01\", \"node02\", \"node03\", \"node04\"}, time.Second*10)\n    if err != nil {\n        panic(err)\n    }\n    c = conn\n}\n\nfunc incr() {\n\n    l := zk.NewLock(c, \"\/lock\", zk.WorldACL(zk.PermAll))\n    err := l.Lock()\n    if err != nil {\n        panic(err)\n    }\n    counter++\n    println(\"lock succ,do your business logic\")\n    l.Unlock()\n    println(\"unlock succ,finish business logic\")\n}\n\nfunc main() {\n\n    var wg sync.WaitGroup\n    for i := 0; i &lt; 1000; i++ {\n        wg.Add(1)\n        go func() {\n            defer wg.Done()\n            incr()\n        }()\n    }\n    wg.Wait()\n    println(counter)\n}\n<\/code><\/pre>\n<pre><code>\u57fa\u4e8eZooKeeper\u7684\u9501\u4e0e\u57fa\u4e8eRedis\u7684\u9501\u7684\u4e0d\u540c\u4e4b\u5904\u5728\u4e8eLock\u6210\u529f\u4e4b\u524d\u4f1a\u4e00\u76f4\u963b\u585e\uff0c\u8fd9\u4e0e\u6211\u4eec\u5355\u673a\u573a\u666f\u4e2d\u7684mutex.Lock\u5f88\u76f8\u4f3c\u3002\n\u5176\u539f\u7406\u4e5f\u662f\u57fa\u4e8e\u4e34\u65f6Sequence\u8282\u70b9\u548cwatch API\uff0c\u4f8b\u5982\u6211\u4eec\u8fd9\u91cc\u4f7f\u7528\u7684\u662f\/lock\u8282\u70b9\u3002Lock\u4f1a\u5728\u8be5\u8282\u70b9\u4e0b\u7684\u8282\u70b9\u5217\u8868\u4e2d\u63d2\u5165\u81ea\u5df1\u7684\u503c\uff0c\u53ea\u8981\u8282\u70b9\u4e0b\u7684\u5b50\u8282\u70b9\u53d1\u751f\u53d8\u5316\uff0c\u5c31\u4f1a\u901a\u77e5\u6240\u6709watch\u8be5\u8282\u70b9\u7684\u7a0b\u5e8f\u3002\u8fd9\u65f6\u5019\u7a0b\u5e8f\u4f1a\u68c0\u67e5\u5f53\u524d\u8282\u70b9\u4e0b\u6700\u5c0f\u7684\u5b50\u8282\u70b9\u7684id\u662f\u5426\u4e0e\u81ea\u5df1\u7684\u4e00\u81f4\u3002\u5982\u679c\u4e00\u81f4\uff0c\u8bf4\u660e\u52a0\u9501\u6210\u529f\u4e86\u3002\n\u8fd9\u79cd\u5206\u5e03\u5f0f\u7684\u963b\u585e\u9501\u6bd4\u8f83\u9002\u5408\u5206\u5e03\u5f0f\u4efb\u52a1\u8c03\u5ea6\u573a\u666f\uff0c\u4f46\u4e0d\u9002\u5408\u9ad8\u9891\u6b21\u6301\u9501\u65f6\u95f4\u77ed\u7684\u62a2\u9501\u573a\u666f\u3002\u6309\u7167Google\u7684Chubby\u8bba\u6587\u91cc\u7684\u9610\u8ff0\uff0c\u57fa\u4e8e\u5f3a\u4e00\u81f4\u534f\u8bae\u7684\u9501\u9002\u7528\u4e8e\u7c97\u7c92\u5ea6\u7684\u52a0\u9501\u64cd\u4f5c\u3002\u8fd9\u91cc\u7684\u7c97\u7c92\u5ea6\u6307\u9501\u5360\u7528\u65f6\u95f4\u8f83\u957f\u3002\u6211\u4eec\u5728\u4f7f\u7528\u65f6\u4e5f\u5e94\u601d\u8003\u5728\u81ea\u5df1\u7684\u4e1a\u52a1\u573a\u666f\u4e2d\u4f7f\u7528\u662f\u5426\u5408\u9002\u3002\n<\/code><\/pre>\n<h4>\u57fa\u4e8eetcd<\/h4>\n<pre><code class=\"language-go line-numbers\">package main\n\nimport (\n    \"log\"\n    \"sync\"\n\n    \"github.com\/zieckey\/etcdsync\"\n)\n\nvar counter int\nvar m *etcdsync.Mutex\n\nfunc init() {\n    mutex, err := etcdsync.New(\"\/lock\", 10, []string{\"http:\/\/node01:2379\"})\n    if m == nil || err != nil {\n        log.Printf(\"etcdsync.New failed\")\n        return\n    }\n    m = mutex\n}\n\nfunc incr() {\n    err := m.Lock()\n    if err != nil {\n        log.Printf(\"etcdsync.Lock failed\")\n        return\n    }\n\n    counter++\n\n    err = m.Unlock()\n    if err != nil {\n        log.Println(\"etcdsync.Unlock failed\")\n    } else {\n        log.Printf(\"etcdsync.Unlock OK\")\n    }\n}\n\nfunc main() {\n    var wg sync.WaitGroup\n    for i := 0; i &lt; 1000; i++ {\n        wg.Add(1)\n        go func() {\n            defer wg.Done()\n            incr()\n        }()\n    }\n    wg.Wait()\n    println(counter)\n}\n<\/code><\/pre>\n<pre><code>etcd\u4e2d\u6ca1\u6709\u50cfZooKeeper\u90a3\u6837\u7684Sequence\u8282\u70b9\u3002\u6240\u4ee5\u5176\u9501\u5b9e\u73b0\u548c\u57fa\u4e8eZooKeeper\u5b9e\u73b0\u7684\u6709\u6240\u4e0d\u540c\u3002\u5728\u4e0a\u8ff0\u793a\u4f8b\u4ee3\u7801\u4e2d\u4f7f\u7528\u7684etcdsync\u7684Lock\u6d41\u7a0b\u662f\uff1a\n\u5148\u68c0\u67e5\/lock\u8def\u5f84\u4e0b\u662f\u5426\u6709\u503c\uff0c\u5982\u679c\u6709\u503c\uff0c\u8bf4\u660e\u9501\u5df2\u7ecf\u88ab\u522b\u4eba\u62a2\u4e86\n\u5982\u679c\u6ca1\u6709\u503c\uff0c\u90a3\u4e48\u5199\u5165\u81ea\u5df1\u7684\u503c\u3002\u5199\u5165\u6210\u529f\u8fd4\u56de\uff0c\u8bf4\u660e\u52a0\u9501\u6210\u529f\u3002\u5199\u5165\u65f6\u5982\u679c\u8282\u70b9\u88ab\u5176\u5b83\u8282\u70b9\u5199\u5165\u8fc7\u4e86\uff0c\u90a3\u4e48\u4f1a\u5bfc\u81f4\u52a0\u9501\u5931\u8d25\uff0c\u8fd9\u65f6\u5019\u5230 3\nwatch \/lock\u4e0b\u7684\u4e8b\u4ef6\uff0c\u6b64\u65f6\u9677\u5165\u963b\u585e\n\u5f53\/lock\u8def\u5f84\u4e0b\u53d1\u751f\u4e8b\u4ef6\u65f6\uff0c\u5f53\u524d\u8fdb\u7a0b\u88ab\u5524\u9192\u3002\u68c0\u67e5\u53d1\u751f\u7684\u4e8b\u4ef6\u662f\u5426\u662f\u5220\u9664\u4e8b\u4ef6\uff08\u8bf4\u660e\u9501\u88ab\u6301\u6709\u8005\u4e3b\u52a8unlock\uff09\uff0c\u6216\u8005\u8fc7\u671f\u4e8b\u4ef6\uff08\u8bf4\u660e\u9501\u8fc7\u671f\u5931\u6548\uff09\u3002\u5982\u679c\u662f\u7684\u8bdd\uff0c\u90a3\u4e48\u56de\u5230 1\uff0c\u8d70\u62a2\u9501\u6d41\u7a0b\u3002\n\u503c\u5f97\u4e00\u63d0\u7684\u662f\uff0c\u5728etcdv3\u7684API\u4e2d\u5b98\u65b9\u5df2\u7ecf\u63d0\u4f9b\u4e86\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528\u7684\u9501API\uff0c\u8bfb\u8005\u53ef\u4ee5\u67e5\u9605etcd\u7684\u6587\u6863\u505a\u8fdb\u4e00\u6b65\u7684\u5b66\u4e60\u3002\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u4e3a\u4ec0\u4e48\u52a0\u9501 \u5b89\u5168\u95ee\u9898 \u7a0b\u5e8f\u5e76\u53d1\u6216\u5e76\u884c\u65f6\uff0c\u5bf9\u5168\u5c40\u53d8\u91cf\u7684\u4fee\u6539\u9700\u8981\u52a0\u9501\uff0c\u4fdd\u8bc1\u4e32\u884c\u5316\u3002 \u9501\u7684\u7f3a\u70b9 \u672a\u62a2\u5230\u9501\u7684\u7a0b\u5e8f\uff08\u8fdb\u7a0b [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[15],"tags":[398],"class_list":["post-3477","post","type-post","status-publish","format-standard","hentry","category-15","tag-go"],"_links":{"self":[{"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=\/wp\/v2\/posts\/3477","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3477"}],"version-history":[{"count":3,"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=\/wp\/v2\/posts\/3477\/revisions"}],"predecessor-version":[{"id":3529,"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=\/wp\/v2\/posts\/3477\/revisions\/3529"}],"wp:attachment":[{"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3477"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3477"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3477"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}