{"id":152721,"date":"2020-09-07T10:28:50","date_gmt":"2020-09-07T02:28:50","guid":{"rendered":"http:\/\/4563.org\/?p=152721"},"modified":"2020-09-07T10:28:50","modified_gmt":"2020-09-07T02:28:50","slug":"java-%e5%b9%b6%e5%8f%91%e5%8c%85-aqs-%e5%ae%9e%e7%8e%b0-%e4%b8%ad-acquirequeued-%e6%ba%90%e7%a0%81%e7%90%86%e8%a7%a3%e7%9a%84%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=152721","title":{"rendered":"Java \u5e76\u53d1\u5305 AQS \u5b9e\u73b0 \u4e2d acquireQueued \u6e90\u7801\u7406\u89e3\u7684\u95ee\u9898"},"content":{"rendered":"
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Java \u5e76\u53d1\u5305 AQS \u5b9e\u73b0 \u4e2d acquireQueued \u6e90\u7801\u7406\u89e3\u7684\u95ee\u9898 <\/h1>\n

<\/p>\n

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\u8cc7\u6df1\u5927\u4f6c : SachinBeyond <\/span> <\/i> 0<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
<\/p>\n

final boolean acquireQueued(final Node node, int arg) { boolean failed = true; try { boolean interrupted = false; for (;;) { final Node p = node.predecessor(); if (p == head && tryAcquire(arg)) {\/\/\u8fd9\u4e2a\u5730\u65b9\u662f\u83b7\u53d6\u9501 setHead(node); p.next = null; \/\/ help GC failed = false; return interrupted; } if (shouldParkAfterFailedAcquire(p, node) && parkAndCheckInterrupt()) interrupted = true; } } finally { if (failed) cancelAcquire(node); } }<\/p>\n

\u6211\u4eec\u77e5\u9053 AQS \u6709\u4e00\u4e2a\u7b49\u5f85\u961f\u5217\u5b58\u653e \u56e0\u83b7\u53d6\u4e0d\u5230\u9501\u800c\u963b\u585e\u7684\u7ebf\u7a0b\u8282\u70b9\u3002 \u4ece\u4e0a\u9762\u7684 \u5b9e\u73b0\u4e2d\u6211\u4eec\u4e5f\u770b\u5230  \u5f53\u9501\u88ab\u91ca\u653e\u7684\u65f6\u5019  \u5524\u9192\u4e0b\u4e00\u4e2a\u8282\u70b9\u7ebf\u7a0b\u7684\u89c4\u5219\u662f  \u83b7\u53d6 head \u8282\u70b9\u7684 next \u8282\u70b9\u4f5c\u4e3a\u4e0b\u4e00\u4e2a\u8981\u88ab\u5524\u9192\u7684\u8282\u70b9\uff0c\u7136\u540e\u8ba9\u8fd9\u4e2a\u8282\u70b9\u5c1d\u8bd5\u83b7\u53d6\u9501\uff0c\u4e5f\u5c31\u662f    if (p == head && tryAcquire(arg))  \u3002 \u5224\u65ad\u5f53\u524d\u8282\u70b9\u7684\u524d\u5c48\u662f\u5426\u662f head\uff0c\u5982\u679c\u662f\u5c31\u5c1d\u8bd5\u83b7\u53d6\u9501\u3002\u5f53 if \u6267\u884c\u6210\u529f\u7684\u65f6\u5019\u5c31\u4f1a\u9000\u51fa for \u5faa\u73af  \u95ee\u9898\uff1a \uff08 1 \uff09 for \u6b7b\u5faa\u73af\u4ec5\u6709\u4e00\u79cd\u9000\u51fa\u65b9\u5f0f(\u4e0a\u9762\u63d0\u5230\u7684  )\u5417\uff1f  \uff08 2 \uff09\u6211\u4eec\u4e0d\u662f\u8bf4 ReentrantLock \u7b49\u5f85\u53ef\u4e2d\u65ad\u5417\uff1f \u4f46\u662f\u4ece for \u6b7b\u5faa\u73af\u4e2d \u6211\u4eec\u770b\u5230\u5373\u4f7f\u4f60 \u4e2d\u65ad\u4e86 \u4e5f\u9000\u51fa\u4e0d for \u5faa\u73af\u5427\uff1f <\/code><\/pre>\n<\/p><\/div>\n
 \u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (1<\/span>)        <\/div>\n
 <\/div>\n<\/p><\/div>\n<\/p><\/div>\n
    \n
  • \n
    \n
    \n
     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : SachinBeyond <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 final boolean acquireQueued(final Node node, int arg) {
     boolean failed = true;
     try {
     boolean interrupted = false;
     for (;;) {
     final Node p = node.predecessor();
     if (p == head && tryAcquire(arg)) {
     setHead(node);
     p.next = null; \/\/ help GC
     failed = false;
     return interrupted;
     }
     if (shouldParkAfterFailedAcquire(p, node) &&
     parkAndCheckInterrupt())
     interrupted = true;
     }
     } finally {
     if (failed)
     cancelAcquire(node);
     }
     }                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n","protected":false},"excerpt":{"rendered":"
    Java \u5e76\u53d1\u5305 AQS \u5b9e\u73b0 \u4e2d…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/152721"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=152721"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/152721\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=152721"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=152721"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=152721"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}