{"id":5485,"date":"2021-08-17T18:44:13","date_gmt":"2021-08-17T10:44:13","guid":{"rendered":"https:\/\/damogame.cn\/wordpress\/?p=5485"},"modified":"2021-08-17T18:44:13","modified_gmt":"2021-08-17T10:44:13","slug":"%e3%80%8alibevent%e6%b7%b1%e5%85%a5%e6%b5%85%e5%87%ba%e3%80%8b-%e5%ad%a6%e4%b9%a0%e7%ac%94%e8%ae%b0","status":"publish","type":"post","link":"https:\/\/i007.cc\/wordpress\/archives\/5485","title":{"rendered":"\u300alibevent\u6df1\u5165\u6d45\u51fa\u300b \u5b66\u4e60\u7b14\u8bb0"},"content":{"rendered":"
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\u539f\u6587\u5730\u5740<\/a><\/div>\n
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Libevent\u7279\u70b9\uff1a<\/b><\/h3>\n
    \n
  • \u4e8b\u4ef6\u9a71\u52a8\uff0c\u9ad8\u6027\u80fd<\/li>\n
  • \u8f7b\u91cf\u7ea7\uff0c\u4e13\u6ce8\u4e8e\u7f51\u7edc<\/li>\n
  • \u8de8\u5e73\u53f0\uff0c\u652f\u6301Windows,linux,Mac os\u7b49<\/li>\n
  • \u652f\u6301\u591a\u79cdI\/O\u590d\u7528\u6280\u672f\uff0cepoll,poll,dev\/poll,select \u548ckqueue\u7b49<\/li>\n
  • \u652f\u6301I\/O\uff0c\u5b9a\u65f6\u5668\u548c\u4fe1\u53f7\u7b49\u4e8b\u4ef6<\/li>\n<\/ul>\n

    \u521b\u5efaevent_base<\/b><\/h3>\n

    \u521b\u5efa\u9ed8\u8ba4\u7684event_base<\/h3>\n
    \n
    \/*\r\n<\/span>@brief create default event_base\r\n<\/span>@return struct event_base*: a pointer to struct event_base or failure return NULL\r\n<\/span>*\/<\/span>\r\nstruct<\/span> event_base<\/span> *<\/span>event_base_new<\/span>(<\/span>void<\/span>);<\/span>\r\n\/\/\u91ca\u653eevent_base\r\n<\/span>void<\/span> event_base_free<\/span>(<\/span>struct<\/span> event_base<\/span> *<\/span>base<\/span>);<\/span><\/code><\/pre>\n<\/div>\n
    \u521b\u5efa\u590d\u6742\u7684event_base<\/b><\/h3>\n
    \u5982\u679c\u9700\u8981\u5bf9event_base\u6709\u66f4\u591a\u7684\u63a7\u5236\uff0c\u9700\u8981\u4f7f\u7528event_config<\/p>\n
    \n
    \/*\r\n<\/span>@brief create a default event_config\r\n<\/span>@return event_config* :failure to return null\r\n<\/span>*\/<\/span>\r\nstruct<\/span> event_config<\/span> *<\/span>event_config_new<\/span>(<\/span>void<\/span>);<\/span>\r\n\/\/create a event_base with event_config\r\n<\/span>struct<\/span> event_base_new_with_config<\/span>(<\/span>const<\/span> struct<\/span> event_config<\/span>*<\/span>cfg<\/span>);<\/span>\r\n\/\/free event_config\r\n<\/span>void<\/span> event_config_free<\/span>(<\/span>struct<\/span> event_config<\/span>*<\/span> cfg<\/span>);<\/span><\/code><\/pre>\n<\/div>\n
    \u8981\u914d\u7f6e\u590d\u6742\u7684event_base\uff0c\u5148\u8c03\u7528event_config_new()\u5206\u914devent_config,\u7136\u540e\u5bf9event_config\u8c03\u7528\u5176\u4ed6\u51fd\u6570\uff0c\u8bbe\u7f6e\u6240\u9700\u8981\u7684event_base\u7279\u5f81\u3002\u6700\u540e\u8c03\u7528event_base_new_with_config()\u83b7\u53d6\u65b0\u7684event_base,\u5b8c\u6210\u4e4b\u540e\u4f7f\u7528event_config_free()\u91ca\u653eevent_config.<\/p>\n
    \n
    \/\/\u901a\u8fc7\u540d\u5b57 \u8bbe\u7f6elibevent\u4e0d\u4f7f\u7528\u7279\u5b9a\u7684\u53ef\u7528\u540e\u7aef\r\n<\/span>int<\/span> event_config_avoid_method<\/span>(<\/span>struct<\/span> event_config<\/span> *<\/span>cfg<\/span>,<\/span>const<\/span> char<\/span>*<\/span> method<\/span>);<\/span>\r\n\/\/\u8bbe\u7f6elibevent \u4e0d\u4f7f\u7528\u4e0d\u80fd\u63d0\u4f9b\u6307\u5b9a\u7279\u5f81\u7684\u540e\u7aef\r\n<\/span>enum<\/span> event_method_feature<\/span>{<\/span>\r\n  EV_FEATURE_ET<\/span> =<\/span> 0x01<\/span>,<\/span> \/\/\u8981\u6c42\u652f\u6301\u8fb9\u6cbf\u89e6\u53d1\u7684\u540e\u7aef\r\n<\/span>  EV_FEATURE_O1<\/span> =<\/span> 0x02<\/span>,<\/span> \/\/ \u8981\u6c42\u6dfb\u52a0\uff0c\u5220\u9664\u5355\u4e2a\u4e8b\u4ef6\uff0c\u6216\u8005\u786e\u5b9a\u54ea\u4e2a\u4e8b\u4ef6\u6fc0\u6d3b\u7684\u64cd\u4f5c\u662fO(1)\u590d\u6742\u5ea6\u7684\u540e\u7aef\r\n<\/span>  EV_FEATURE_FDS<\/span> =<\/span> 0x04<\/span> \/\/ \u8981\u6c42\u652f\u6301\u4efb\u610f\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u800c\u4e0d\u4ec5\u4ec5\u662f\u5957\u63a5\u5b57\u7684\u540e\u7aef\r\n<\/span>};<\/span>\r\n\/\/\u8bbe\u7f6e\u6210\u529f\u8fd4\u56de0\uff0c\u5931\u8d25\u8fd4\u56de-1\r\n<\/span>int<\/span> event_config_require_features<\/span>(<\/span>struct<\/span> event_config<\/span> *<\/span>cfg<\/span>,<\/span>\r\n                                  enum<\/span> event_method_feature<\/span> feature<\/span>);<\/span>\r\n\u200b<\/span>\r\n\/\/\u8bbe\u7f6e\u521b\u5efaevent_base\u65f6\u8bbe\u7f6e\u4e00\u4e2a\u6d3b\u7740\u591a\u4e2a\u8fd0\u884c\u65f6\u7684\u6807\u5fd7\r\n<\/span>enum<\/span> event_base_config_flag<\/span>{<\/span>\r\n  EVENT_BASE_FLAG_NOLOCK<\/span> =<\/span> 0x01<\/span>,<\/span> \/\/\u4e0d\u8981\u4e3aevent_base\u5206\u914d\u9501\uff0c\u5bb9\u6613\u9020\u6210\u591a\u7ebf\u7a0b\u4e0d\u5b89\u5168\r\n<\/span>  EVENT_BASE_FLAG_IGNORE_ENV<\/span> =<\/span> 0x02<\/span>,<\/span> \/\/ \u4f7f\u7528\u7684\u540e\u7aef\uff0c\u4e0d\u8981\u68c0\u6d4bEVENT*\u73af\u5883\u53d8\u91cf\uff0c\u4f7f\u7528\u8fd9\u4e2a\u6807\u5fd7\u548c\u66f4\u96be\u8c03\u8bd5\r\n<\/span>  EVENT_BASE_FLAG_STARTUO_IOCP<\/span> =<\/span> 0x04<\/span>,<\/span> \/\/\u4ec5\u4ec5\u7528\u4e8eWINDOWS,\u8ba9libevent\u5728\u542f\u52a8\u65f6\u5c31\u542f\u7528\u4efb\u4f55\u5fc5\u9700\u7684IOCP\u5206\u53d1\u903b\u8f91\uff0c\u800c\u4e0d\u662f\u6309\u9700\u542f\u7528\r\n<\/span>  EVENT_BASE_FLAG_NO_CACHE_TIME<\/span> =<\/span> 0x08<\/span>,<\/span> \/\/ \u5728\u6bcf\u6b21\u8d85\u65f6\u56de\u8c03\u540e\u8fdb\u884c\u68c0\u6d4b\u5f53\u524d\u65f6\u95f4\r\n<\/span>  EVENT_BASE_FLAG_EPOLL_USE_CHANGELIST<\/span> =<\/span> 0x10<\/span>,<\/span> \/\/\u5982\u679c\u679c\u51b3\u5b9a\u4f7f \u7528 epoll \u540e\u7aef,\u53ef\u4ee5\u5b89\u5168\u5730\u4f7f\u7528\u66f4\u5feb\u7684\u57fa\u4e8e changelist \u7684\u540e\u7aef\u3002\u4f46\u662f\u5982\u679c\u4f20\u9012\u4efb\u4f55\u4f7f\u7528 dup()\u6216\u8005\u5176\u53d8\u4f53\u514b\u9686\u7684 fd \u7ed9 libevent,epoll-changelist \u540e\u7aef\u4f1a\u89e6\u53d1\u4e00\u4e2a\u5185\u6838 bug,\u5bfc\u81f4\u4e0d\u6b63\u786e\u7684\u7ed3\u679c\uff0c EVENT_EPOLL_USE_CHANGELIST\u73af\u5883\u53d8\u91cf\u7528\u4e8e\u6253\u5f00epoll-changelist\r\n<\/span>  EVENT_BASE_FLAG_PRECISE_TIMER<\/span> =<\/span> 0x20<\/span>,<\/span> \/\/\u662f\u5426\u4f7f\u7528\u66f4\u7cbe\u51c6\u7684\u65f6\u95f4\r\n<\/span>};<\/span>\r\n\/\/\u8bbe\u7f6e\u6210\u529f\u8fd4\u56de0\uff0c\u5931\u8d25\u8fd4\u56de-1\r\n<\/span>int<\/span> event_config_set_flag<\/span>(<\/span>struct<\/span> event_config<\/span> *<\/span>cfg<\/span>,<\/span>\r\n                         enum<\/span> event_base_config_flag<\/span> flag<\/span>);<\/span><\/code><\/pre>\n<\/div>\n
    \u68c0\u67e5event_base<\/h3>\n
    \n
    \/\/\u8fd4\u56de\u4e00\u4e2a\u6307\u9488\uff0c\u6307\u5411libevent\u652f\u6301\u7684\u65b9\u6cd5\u7684\u540d\u5b57\u6570\u5b57\uff0c\u6570\u7ec4\u7684\u6700\u540e\u4e00\u4e2a\u5143\u7d20\u662fNULL\r\n<\/span>const<\/span> char<\/span> **<\/span>event_get_supported_methods<\/span>(<\/span>void<\/span>);<\/span>\r\n\/\/\u83b7\u53d6\u5f53\u524devent_base\u6b63\u5728\u4f7f\u7528\u7684\u65b9\u6cd5\r\n<\/span>const<\/span> char<\/span>*<\/span> eevnt_base_get_method<\/span>(<\/span>const<\/span> struct<\/span> event_base<\/span>*<\/span> base<\/span>);<\/span>\r\n\/\/\u8fd4\u56deevent_base\u652f\u6301\u7684\u7279\u5f81\u7684\u6bd4\u7279\u63a9\u7801\r\n<\/span>enum<\/span> event_method_feature<\/span> event_base_get_features<\/span>(<\/span>const<\/span> struct<\/span> event_base<\/span>*<\/span> base<\/span>);<\/span><\/code><\/pre>\n<\/div>\n
    \u8bbe\u7f6eevent_base\u4f18\u5148\u7ea7<\/h3>\n
    libevent\u652f\u6301\u4e3a\u591a\u4e2a\u4e8b\u4ef6\u8bbe\u7f6e\u4f18\u5148\u7ea7\uff0cevent_base\u9ed8\u8ba4\u53ea\u652f\u6301\u5355\u4e2a\u4f18\u5148\u7ea7\uff0c\u53ef\u4ee5\u8c03\u7528event_base_priority_init()\u8bbe\u7f6eevent_base\u7684\u4f18\u5148\u7ea7\uff0c\u5fc5\u987b\u5728\u4efb\u4f55\u4e8b\u4ef6\u6fc0\u6d3b\u4e4b\u524d\u8c03\u7528\uff0c\u6700\u597d\u5728\u521b\u5efaevent_base\u4e4b\u540e\u8c03\u7528<\/p>\n
    \n
    \/\/\u6210\u529f\u8fd4\u56de0 \u5931\u8d25\u8fd4\u56de-1\uff0c\u5e38\u91cfEVENT_MAX_PRIORITIES\u8868\u793an_priorities\u7684\u4e0a\u9650\u3002\u6bcf\u4e2a\u65b0\u4e8b\u4ef6\u7684\u4f18\u5148\u7ea7\u5c06\u4ece0\uff08\u6700\u9ad8\uff09\u5230n_priorities-1\u6700\u4f4e\r\n<\/span>int<\/span> event_base_priority_init<\/span>(<\/span>struct<\/span> event_base<\/span>*<\/span> base<\/span>,<\/span>int<\/span> n_priorities<\/span>);<\/span><\/code><\/pre>\n<\/div>\n
    \u7ed3\u5408fork<\/h3>\n
    \u5982\u679c\u5728\u65b0\u8fdb\u7a0b\u4e2d\u9700\u8981\u7ee7\u7eed\u4f7f\u7528event_base\uff0c\u5c31\u9700\u8981\u8fdb\u884c\u91cd\u65b0\u521d\u59cb\u5316\u3002<\/p>\n
    \n
    \/\/\u6210\u529f\u8fd4\u56de0 \u5931\u8d25\u8fd4\u56de-1\r\n<\/span>int<\/span> event_reinit<\/span>(<\/span>struct<\/span> event_base<\/span> *<\/span>base<\/span>);<\/span><\/code><\/pre>\n<\/div>\n
    \u521b\u5efa\u4e8b\u4ef6event<\/h3>\n
    \u4f7f\u7528event_new()\u63a5\u53e3\u521b\u5efa\u4e8b\u4ef6<\/p>\n
    \n
    #define EV_TIMOUT   0x01 <\/span>\/\/\u8868\u793a\u4e8b\u4ef6\u8d85\u65f6\u540e\u6094\u53d8\u6210\u6fc0\u6d3b\u7684\r\n<\/span>#define EV_READ     0x02 <\/span>\/\/\u8868\u793a\u6307\u5b9a\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u8bfb\u4e8b\u4ef6\u5c31\u7eea\r\n<\/span>#define EV_WRITE    0x04 <\/span>\/\/\u8868\u793a\u6307\u5b9a\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26 \u5199\u4e8b\u4ef6\u5c31\u7eea\r\n<\/span>#define EV_SIGNAL   0x08 <\/span>\/\/ \u7528\u4e8e\u5b9e\u73b0\u4fe1\u53f7\u68c0\u6d4b\r\n<\/span>#define EV_PERSISIT 0x10 <\/span>\/\/\u8868\u793a\u4e8b\u4ef6\u662f\u6301\u4e45\u7684\r\n<\/span>#define EV_ET       0x20 <\/span>\/\/\u5982\u679c\u652f\u6301\u8fb9\u6cbf\u89e6\u53d1\uff0c\u90a3\u4e48\u4e8b\u4ef6\u662f\u8fb9\u6cbf\u89e6\u53d1\u7684\u4f1a\u5f71\u54cdEV_READ\u548cEV_WRITE\r\n<\/span>\u200b<\/span>\r\n\/\/\u56de\u8c03\u51fd\u6570\r\n<\/span>typedef<\/span> void<\/span> (<\/span>*<\/span>event_callback_fn<\/span>)(<\/span>evutil_socket_t<\/span>,<\/span>short<\/span>,<\/span>void<\/span>*<\/span>);<\/span>\r\n\u200b<\/span>\r\n\u200b<\/span>\r\n\/\/\u5206\u914d\u548c\u6784\u9020\u4e00\u4e2a\u7528\u4e8ebase\u7684\u65b0\u7684\u4e8b\u4ef6\uff0cwhat\u53c2\u6570\u662f\u4e0a\u8ff0\u6807\u5fd7\u7684\u96c6\u5408\uff0c\u4e8b\u4ef6\u88ab\u6fc0\u6d3b\u65f6\uff0clibevent\u8c03\u7528cb\u51fd\u6570\uff0cfd\u662f\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002what\u8868\u793a\u89e6\u53d1\u7684\u4e8b\u4ef6\u7684\u4f4d\u5b57\u6bb5\uff0c\u4ee5\u53ca\u6784\u9020\u4e8b\u4ef6\u65f6\u7684arg\u53c2\u6570\u3002\u53d1\u751f\u9519\u8bef\u6216\u8005\u4f20\u5165\u65e0\u6548\u53c2\u6570\u65f6\uff0cevent_new()\u5c06\u8fd4\u56deNULL\r\n<\/span>struct<\/span> event<\/span>*<\/span> event_new<\/span>(<\/span>struct<\/span> event_base<\/span>*<\/span> base<\/span>,<\/span>evutil_socket_t<\/span> fd<\/span>,<\/span>\r\n                        short<\/span> what<\/span>,<\/span>event_callback_fn<\/span> cb<\/span>,<\/span>\r\n                        void<\/span> *<\/span>args<\/span>);<\/span>\r\n\/\/\u91ca\u653eevent \u4e8b\u4ef6\u3002\u5bf9\u4e8e\u672a\u51b3\u7684\u83b7\u77e5\u6fc0\u6d3b\u72b6\u6001\u7684\u4e8b\u4ef6\u8c03\u7528event_free()\u662f\u5b89\u5168\u7684\uff0c\u5728\u91ca\u653e\u4e8b\u4ef6\u4e4b\u524d\uff0c\u51fd\u6570\u4f1a\u5c06\u4e8b\u4ef6\u6210\u4e3a\u975e\u6fc0\u6d3b\u7684\u548c\u975e\u672a\u51b3\u7684\u3002\r\n<\/span>void<\/span> event_free<\/span>(<\/span>struct<\/span> event<\/span>*<\/span> event<\/span>);<\/span><\/code><\/pre>\n<\/div>\n
    \u4e8b\u4ef6\u7684\u6301\u4e45\u6027\uff0c\u5982\u679c\u60f3\u5728\u56de\u8c03\u4e2d\u8ba9\u4e8b\u4ef6\u6210\u4e3a\u975e\u672a\u51b3\u7684\uff0c\u53ef\u4ee5\u5bf9\u5176\u8c03\u7528event_del().\u6bcf\u6b21\u6267\u884c\u4e8b\u4ef6\u56de\u8c03\u7684\u65f6\u5019\uff0c\u6301\u4e45\u4e8b\u4ef6\u7684\u8d85\u65f6\u503c\u4f1a\u88ab\u590d\u4f4d\u3002<\/p>\n
    \u4fe1\u53f7\u4e8b\u4ef6\uff0clibevent\u53ef\u4ee5\u68c0\u6d4b\u4fe1\u53f7\u4e8b\u4ef6\uff0c\u5904\u7406\u63d0\u4f9b\u4e00\u4e2a\u4fe1\u53f7\u7f16\u53f7\u4ee3\u66ff\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e4b\u5916\uff0c\u5404\u4e2a\u53c2\u6570\u4e0eevent_new()\u76f8\u540c<\/p>\n
    \n
    #define evsignal_new(base,signum,cb,arg) \\\r\n<\/span>        event_new(base,signum,EV_SIGNAL|EV_PERSIST,cb,arg)<\/span><\/code><\/pre>\n<\/div>\n
    libevent\u6709\u4ee5\u4e0b\u7684\u5b8f\u7528\u6765\u5904\u7406\u4fe1\u53f7\u4e8b\u4ef6<\/p>\n
    \n
    #define evsignale_add(ev,tv) \\\r\n<\/span>        event_add((ev),(tv))\r\n<\/span>#define evsignal_del(ev) \\\r\n<\/span>        event_del(ev)\r\n<\/span>#define evsignal_pending(ev,what,tv_out) \\\r\n<\/span>        event_pending((ev),(what),(tv_out))<\/span><\/code><\/pre>\n<\/div>\n
    \u8bbe\u7f6e\u672a\u51b3\u4e8b\u4ef6\uff1a<\/p>\n
    \u6dfb\u52a0\u4e8b\u4ef6\uff0c\u5982\u679c\u6dfb\u52a0\u6210\u529f\u8fd4\u56de0\uff0c\u5931\u8d25\u8fd4\u56de-1\uff0c\u5982\u679ctv\u4e3aNULL,\u6dfb\u52a0\u7684\u4e8b\u4ef6\u4e0d\u4f1a\u8d85\u65f6\uff0c\u5426\u5219\u8d85\u65f6\u65f6\u95f4\u672atv\u4e2d\u8bbe\u7f6e\u7684\u503c<\/p>\n
    \n
    int<\/span> event_add<\/span>(<\/span>struct<\/span> event<\/span>*<\/span> ev<\/span>,<\/span>const<\/span> struct<\/span> timeval<\/span> *<\/span>tv<\/span>);<\/span><\/code><\/pre>\n<\/div>\n
    \u8bbe\u7f6e\u975e\u672a\u51b3\u4e8b\u4ef6<\/p>\n
    \n
    int<\/span> event_del<\/span>(<\/span>struct<\/span> event<\/span>*<\/span> ev<\/span>);<\/span><\/code><\/pre>\n<\/div>\n
    \u5bf9\u5df2\u7ecf\u521d\u59cb\u5316\u7684\u4e8b\u4ef6\u8c03\u7528 event_del()\u5c06\u4f7f\u5176\u6210\u4e3a\u975e\u672a\u51b3\u548c\u975e\u6fc0\u6d3b\u7684\u3002\u5982\u679c\u4e8b\u4ef6\u4e0d\u662f\u672a\u51b3\u7684\u6216\u8005\u6fc0\u6d3b\u7684,\u8c03\u7528\u5c06\u6ca1\u6709\u6548\u679c\u3002\u6210\u529f\u65f6\u51fd\u6570\u8fd4\u56de 0,\u5931\u8d25\u65f6\u8fd4\u56de-1\u3002\u56de\u8c03\u5728\u6267\u884c\u524d\u5220\u9664\u4e8b\u4ef6\uff0c\u5219\u4e0d\u4f1a\u6267\u884c\u3002<\/p>\n
    \u8bbe\u7f6e\u4e8b\u4ef6\u7684\u4f18\u5148\u7ea7\uff1a<\/p>\n
    \u5728\u521d\u59cb\u5316\u4e8b\u4ef6\u4e4b\u540e\uff0c\u4f46\u662f\u5728\u6dfb\u52a0\u5230event_base\u4e4b\u524d\uff0c\u53ef\u4ee5\u4e3a\u5176\u8bbe\u7f6e\u4f18\u5148\u7ea7\u3002<\/p>\n
    \n
    int<\/span> event_priority_set<\/span>(<\/span>struct<\/span> event<\/span> *<\/span>event<\/span>,<\/span>int<\/span> priority<\/span>);<\/span><\/code><\/pre>\n<\/div>\n
    \u4e8b\u4ef6\u7684\u4f18\u5148\u7ea7\u662f\u4e00\u4e2a\u57280\u548cevent_base\u7684\u4f18\u5148\u7ea7\u51cf\u53bb1\u4e4b\u95f4\u7684\u6570\u503c\uff0c\u6210\u529f\u65f6\u51fd\u6570\u8fd4\u56de0\uff0c\u5931\u8d25\u8fd4\u56de-1.libevent\u4f1a\u6267\u884c\u9ad8\u4f18\u5148\u7ea7\u7684\u4e8b\u4ef6\uff0c\u5728\u6ca1\u6709\u9ad8\u4f18\u5148\u7ea7\u4e8b\u4ef6\u6fc0\u6d3b\u7684\u65f6\u5019\uff0c\u4f4e\u4f18\u5148\u7ea7\u4e8b\u4ef6\u624d\u4f1a\u8fd0\u884c\u3002<\/p>\n
    \u68c0\u67e5\u4e8b\u4ef6\uff1a<\/p>\n
    \n
    \/**\r\n<\/span>  Checks if a specific event is pending or scheduled.\r\n<\/span>  @param ev an event struct previously passed to event_add()\r\n<\/span>  @param events the requested event type; any of EV_TIMEOUT|EV_READ|\r\n<\/span>         EV_WRITE|EV_SIGNAL\r\n<\/span>  @param tv if this field is not NULL, and the event has a timeout,\r\n<\/span>         this field is set to hold the time at which the timeout will\r\n<\/span>     expire.\r\n<\/span>  @return true if the event is pending on any of the events in 'what', (that\r\n<\/span>  is to say, it has been added), or 0 if the event is not added.\r\n<\/span> *\/<\/span>\r\nint<\/span> event_pending<\/span>(<\/span>const<\/span> struct<\/span> event<\/span>*<\/span> ev<\/span>,<\/span>short<\/span> what<\/span>,<\/span>struct<\/span> timeval<\/span>*<\/span> tv_out<\/span>);<\/span>\r\n\u200b<\/span>\r\n#define event_get_signal(ev) ((int)event_get_fd(ev))\r\n<\/span>\/**\r\n<\/span>   Get the socket or signal assigned to an event, or -1 if the event has\r\n<\/span>   no socket.\r\n<\/span>\u200b\r\n<\/span>evutil_socket_t event_get_fd(const struct event* ev);\r\n<\/span>\/**\r\n<\/span>   Get the event_base associated with an event.\r\n<\/span>*\/<\/span>\r\nstruct<\/span> event_base<\/span> *<\/span>event_get_base<\/span>(<\/span>const<\/span> struct<\/span> event<\/span>*<\/span> ev<\/span>);<\/span>\r\n\/**\r\n<\/span>   Return the events (EV_READ, EV_WRITE, etc) assigned to an event.\r\n<\/span>*\/<\/span>\r\nshort<\/span> event_get_events<\/span>(<\/span>const<\/span> struct<\/span> event<\/span> *<\/span>ev<\/span>);<\/span>\r\n\/**\r\n<\/span>   Return the callback assigned to an event.\r\n<\/span>*\/<\/span>\r\nevent_callback_fn<\/span> event_get_callback<\/span>(<\/span>const<\/span> struct<\/span> event<\/span>*<\/span> ev<\/span>);<\/span>\r\n\/**\r\n<\/span>   Return the callback argument assigned to an event.\r\n<\/span>*\/<\/span>\r\nvoid<\/span> *<\/span>event_get_callback_arg<\/span>(<\/span>const<\/span> struct<\/span> event<\/span>*<\/span> ev<\/span>);<\/span>\r\n\u200b<\/span>\r\nint<\/span> event_get_priority<\/span>(<\/span>const<\/span> struct<\/span> event<\/span>*<\/span> ev<\/span>);<\/span>\r\n\/**\r\n<\/span>   Extract _all_ of arguments given to construct a given event.  The\r\n<\/span>   event_base is copied into *base_out, the fd is copied into *fd_out, and so\r\n<\/span>   on.\r\n<\/span>   If any of the \"_out\" arguments is NULL, it will be ignored.\r\n<\/span> *\/<\/span>\r\nvoid<\/span> event_get_assignment<\/span>(<\/span>const<\/span> struct<\/span> event<\/span>*<\/span> event<\/span>,<\/span>\r\n                         struct<\/span> event_base<\/span> **<\/span>base_out<\/span>,<\/span>\r\n                         evutil_socket_t<\/span> *<\/span>fd_out<\/span>,<\/span>\r\n                         short<\/span> *<\/span>events_out<\/span>,<\/span>\r\n                         event_callback_fn<\/span>*<\/span> callback_out<\/span>,<\/span>\r\n                         void<\/span> **<\/span>arg_out<\/span>);<\/span><\/code><\/pre>\n<\/div>\n
    \u4e00\u6b21\u89e6\u53d1\u4e8b\u4ef6<\/p>\n
    \u5982\u679c\u4e0d\u9700\u8981\u591a\u6b21\u6dfb\u52a0\u4e00\u4e2a\u4e8b\u4ef6\uff0c\u6216\u8005\u8981\u5728\u6dfb\u52a0\u540e\u7acb\u5373\u5220\u9664\u4e8b\u4ef6\uff0c\u800c\u4e8b\u4ef6\u53c8\u4e0d\u9700\u8981\u662f\u6301\u4e45\u7684\uff0c\u5219\u53ef\u4ee5\u4f7f\u7528event_base_once()\uff0c\u4e0d\u652f\u6301EV_SIGNAL\u548cEV_PERSIST\u3002\u5b89\u6392\u7684\u4e8b\u4ef6\u5c06\u4ee5\u9ed8\u8ba4\u7684\u4f18\u5148\u7ea7\u52a0\u5165\u5230event_base\u5e76\u6267\u884c\u3002\u6267\u884c\u5b8c\u6210\u540e\uff0c\u4f1a\u91ca\u653eevent\u7ed3\u6784\uff0c\u6210\u529f\u65f6\u8fd4\u56de0\uff0c\u5931\u8d25\u65f6\u8fd4\u56de-1\u3002<\/p>\n
    \n
    int<\/span> event_base_once<\/span>(<\/span>struct<\/span> event_base<\/span> *<\/span>base<\/span>,<\/span>\r\n                    evutil_socket_t<\/span> fd<\/span>,<\/span>\r\n                    short<\/span> what<\/span>\r\n                   event_callback_fn<\/span> cb<\/span>,<\/span>\r\n                   void<\/span> *<\/span>arg<\/span>,<\/span>const<\/span> struct<\/span> timeval<\/span>*<\/span> tv<\/span>);<\/span><\/code><\/pre>\n<\/div>\n
    \u624b\u52a8\u6fc0\u6d3b\u4e8b\u4ef6\uff1a<\/p>\n
    \u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u9700\u8981\u5728\u4e8b\u4ef6\u7684\u6761\u4ef6\u6ca1\u6709\u89e6\u53d1\u7684\u65f6\u5019\u8ba9\u4e8b\u4ef6\u6fc0\u6d3b\u3002<\/p>\n
    \n
    void<\/span> event_active<\/span>(<\/span>struct<\/span> event<\/span>*<\/span> ev<\/span>,<\/span>int<\/span> what<\/span>,<\/span>short<\/span> ncalls<\/span>);<\/span><\/code><\/pre>\n<\/div>\n
    <\/figure>\n
    \u4e8b\u4ef6\u5faa\u73af<\/h3>\n
    \u4e00\u65e6\u6709\u4e86\u4e00\u4e2a\u5df2\u7ecf\u6ce8\u518c\u4e86\u7684\u67d0\u4e9b\u4e8b\u4ef6\u7684event_base\uff0c\u5c31\u9700\u8981\u8ba9libevent\u7b49\u5f85\u4e8b\u4ef6\u5e76\u4e14\u901a\u77e5\u4e8b\u4ef6\u7684\u53d1\u751f\u3002<\/p>\n
    \n
    #define EVLOOP_ONCE             0x01\r\n<\/span>#define EVLOOP_NOBLOCK          0x02\r\n<\/span>#define EVLOOP_NO_EXIT_ON_EMPTY  0x04\r\n<\/span>\u200b<\/span>\r\nint<\/span> event_base_loop<\/span>(<\/span>struct<\/span> event_base<\/span> *<\/span>base<\/span>,<\/span>int<\/span> flags<\/span>);<\/span><\/code><\/pre>\n<\/div>\n
    \u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0cevent_base_loop()\u51fd\u6570\u8fd0\u884cevent_base\u76f4\u5230\u5176\u4e2d\u6ca1\u6709\u5df2\u7ecf\u6ce8\u518c\u7684\u4e8b\u4ef6\u4e3a\u6b62\u3002<\/p>\n
    flag: EVLOOP_ONCE\u5faa\u73af\u5c06\u7b49\u5f85\u67d0\u4e9b\u4e8b\u4ef6\u6210\u4e3a\u6fc0\u6d3b\u7684 ,\u6267\u884c\u6fc0\u6d3b\u7684\u4e8b\u4ef6\u76f4\u5230\u6ca1\u6709\u66f4\u591a\u7684\u4e8b\u4ef6\u53ef\u4ee5\u6267\u884c,\u7136\u4f1a\u8fd4\u56de\u3002\u5982\u679c\u8bbe\u7f6e\u4e86 EVLOOP_NONBLOCK,\u5faa\u73af\u4e0d\u4f1a\u7b49\u5f85\u4e8b\u4ef6\u88ab\u89e6\u53d1: \u5faa\u73af\u5c06\u4ec5\u4ec5\u68c0\u6d4b\u662f\u5426\u6709\u4e8b\u4ef6\u5df2\u7ecf\u5c31\u7eea,\u53ef\u4ee5\u7acb\u5373\u89e6\u53d1,\u5982\u679c\u6709,\u5219\u6267\u884c\u4e8b\u4ef6\u7684\u56de\u8c03\u3002<\/p>\n
    \u4e5f\u53ef\u4ee5\u4f7f\u7528<\/p>\n
    \n
    int<\/span> event_base_dispatch<\/span>(<\/span>struct<\/span> event_base<\/span>*<\/span> base<\/span>);<\/span><\/code><\/pre>\n<\/div>\n
    event_base_dispatch()\u7b49\u540c\u4e8e\u6ca1\u6709\u8bbe\u7f6e\u6807\u5fd7\u7684event_base_loop()\u3002\u5c06\u4e00\u76f4\u8fd0\u884c\u76f4\u5230\u6ca1\u6709\u5df2\u7ecf\u6ce8\u518c\u7684\u4e8b\u4ef6\u6216\u8005\u8c03\u7528\u4e0b\u5217\u51fd\u6570<\/p>\n
    \n
    \/\/event_base_loopexit()\u8ba9 event_base \u5728\u7ed9\u5b9a\u65f6\u95f4\u4e4b\u540e\u505c\u6b62\u5faa\u73af\u3002\u5982\u679c tv \u53c2\u6570\u4e3a NULL, event_base \u4f1a\u7acb\u5373\u505c\u6b62\u5faa\u73af,\u6ca1\u6709\u5ef6\u65f6\u3002\r\n<\/span>int<\/span> event_base_loopexit<\/span>(<\/span>struct<\/span> event_base<\/span> *<\/span>base<\/span>,<\/span>\r\n                        struct<\/span> timeval<\/span> *<\/span>tv<\/span>);<\/span>\r\n\/\/event_base_loopbreak ()\u8ba9 event_base \u7acb\u5373\u9000\u51fa\u5faa\u73af\u3002\r\n<\/span>int<\/span> event_base_loopbreak<\/span>(<\/span>struct<\/span> event_base<\/span> *<\/span>base<\/span>);<\/span><\/code><\/pre>\n<\/div>\n
    \u8f6c\u50a8event_base\u7684\u72b6\u6001\uff1a<\/p>\n
    \u8c03\u7528event_base_dump_events()\u53ef\u4ee5\u5c06event_base\u7684\u4fe1\u606f\u8f93\u51fa\u5230\u6307\u5b9a\u7684\u6587\u4ef6\u4e2d<\/p>\n
    \n
    void<\/span> event_base_dump_events<\/span>(<\/span>struct<\/span> event_base<\/span>*<\/span> base<\/span>,<\/span>FILE<\/span> *<\/span>f<\/span>);<\/span><\/code><\/pre>\n<\/div>\n
    \u6570\u636e\u7f13\u51b2Bufferevent<\/h3>\n
    bufferevent\u7531\u4e00\u4e2a\u5e95\u5c42\u7684\u4f20\u8f93\u7aef\u53e3\uff0c\u4e00\u4e2a\u8bfb\u53d6\u7f13\u51b2\u533a\u548c\u4e00\u4e2a\u5199\u5165\u7f13\u51b2\u533a\u7ec4\u6210\u3002bufferevent\u5728\u8bfb\u53d6\u6216\u8005\u5199\u5165\u8db3\u591f\u91cf\u7684\u6570\u636e\u4e4b\u540e\u8c03\u7528\u7528\u6237\u63d0\u4f9b\u7684\u56de\u8c03\u3002\u6bcf\u4e2abufferevent\u90fd\u6709\u4e00\u4e2a\u8f93\u5165\u7f13\u51b2\u533a\u548c\u8f93\u51fa\u7f13\u51b2\u533a\uff0c\u7c7b\u578b\u90fd\u662fevbuff<\/p>\n
    \u6bcf\u4e2abufferevent\u6709\u4e24\u4e2a\u6570\u636e\u76f8\u5173\u7684\u56de\u8c03\uff0c\u4e00\u4e2a\u8bfb\u53d6\u56de\u8c03\u548c\u4e00\u4e2a\u5199\u5165\u56de\u8c03\u3002\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u4ece\u5e95\u5c42\u4f20\u8f93\u7aef\u53e3\u8bfb\u53d6\u4e86\u4efb\u610f\u91cf\u7684\u6570\u636e\u4e4b\u540e\u4f1a\u8c03\u7528\u8bfb\u53d6\u56de\u8c03\u3002\u8f93\u51fa\u7f13\u51b2\u533a\u4e2d\u8db3\u591f\u91cf\u7684\u6570\u636e\u88ab\u6e05\u7a7a\u5230\u5e95\u5c42\u4f20\u8f93\u7aef\u53e3\u540e\u8c03\u7528\u5199\u5165\u56de\u8c03\u51fd\u6570\u3002\u6bcf\u4e2abufferevent\u6709\u56db\u4e2a\u6c34\u4f4d\uff1a<\/p>\n
      \n
    • \u8bfb\u53d6\u4f4e\u6c34\u4f4d \uff1a \u53d6\u64cd\u4f5c\u4f7f\u5f97\u8f93\u5165\u7f13\u51b2\u533a\u7684\u6570\u636e\u91cf\u5728\u6b64\u7ea7\u522b\u6216\u8005\u66f4\u9ad8\u65f6 ,\u8bfb\u53d6\u56de\u8c03\u5c06\u88ab\u8c03\u7528\u3002\u9ed8\u8ba4\u503c\u4e3a 0,\u6240\u4ee5\u6bcf\u4e2a\u8bfb\u53d6\u64cd\u4f5c\u90fd\u4f1a\u5bfc\u81f4\u8bfb\u53d6\u56de\u8c03\u88ab\u8c03\u7528\u3002<\/li>\n
    • \u8bfb\u53d6\u9ad8\u6c34\u4f4d\uff1a\u8f93\u5165\u7f13\u51b2\u533a\u4e2d\u7684\u6570\u636e\u91cf\u8fbe\u5230\u6b64\u7ea7\u522b\u540e, bufferevent \u5c06\u505c\u6b62\u8bfb\u53d6,\u76f4\u5230\u8f93\u5165\u7f13\u51b2\u533a\u4e2d\u8db3\u591f\u91cf\u7684\u6570\u636e\u88ab\u62bd\u53d6 ,\u4f7f\u5f97\u6570\u636e\u91cf\u4f4e\u4e8e\u6b64\u7ea7\u522b<\/li>\n
    • \u5199\u5165\u4f4e\u6c34\u4f4d\uff1a\u5199\u5165\u64cd\u4f5c\u4f7f\u5f97\u8f93\u51fa\u7f13\u51b2\u533a\u7684\u6570\u636e\u91cf\u8fbe\u5230\u6216\u8005\u4f4e\u4e8e\u6b64\u7ea7\u522b\u65f6 ,\u5199\u5165\u56de\u8c03\u5c06\u88ab\u8c03\u7528<\/li>\n
    • \u5199\u5165\u9ad8\u6c34\u4f4d\uff1abufferevent \u6ca1\u6709\u76f4\u63a5\u4f7f\u7528\u8fd9\u4e2a\u6c34\u4f4d<\/li>\n<\/ul>\n
      \u9ed8\u8ba4\u60c5\u51b5\u4e0b,bufferevent \u7684\u56de\u8c03\u5728\u76f8\u5e94\u7684\u6761\u4ef6\u53d1\u751f\u65f6\u7acb\u5373\u88ab\u6267\u884c\uff0c\u5728\u4f9d\u8d56\u5173\u7cfb\u590d\u6742\u7684\u60c5\u51b5\u4e0b ,\u8fd9\u79cd\u7acb\u5373\u8c03\u7528\u4f1a\u5236\u9020\u9ebb\u70e6 \u3002\u8981\u89e3\u51b3\u8fd9\u6837\u7684\u9ebb\u70e6\uff0c\u53ef\u4ee5\u8bf7\u6c42bufferevent\u5ef6\u8fdf\u5176\u56de\u8c03\u3002<\/p>\n
      \u521b\u5efabufferevent\u4f7f\u7528\u7684\u6807\u5fd7\uff1a<\/p>\n
        \n
      • BEV_OPT_CLOSE_ON_FREE: \u91ca\u653ebufferevent\u65f6\u5173\u95ed\u5e95\u5c42\u4f20\u8f93\u7aef\u53e3<\/li>\n
      • BEV_OPT_THREADSAFE: \u81ea\u52a8\u672abufferevent\u5206\u914d\u9501\uff0c\u591a\u7ebf\u7a0b\u5b89\u5168<\/li>\n
      • BEV_OPT_DEFER_CALLBACKS:\u8bbe\u7f6ebufferevent\u5ef6\u8fdf\u56de\u8c03<\/li>\n
      • BEV_OPT_UNLOCK_CALLBACKS:\u8bbe\u7f6ebufferevent\u5728\u6267\u884c\u56de\u8c03\u7684\u65f6\u5019\u4e0d\u8fdb\u884c\u9501\u5b9a\u3002<\/li>\n<\/ul>\n
        \u521b\u5efa\u57fa\u4e8e\u5957\u63a5\u5b57\u7684bufferevent<\/p>\n
        \n
        struct<\/span> bufferevent<\/span> *<\/span>bufferevent_socket_new<\/span>(<\/span>\r\n    struct<\/span> event_base<\/span> *<\/span>base<\/span>,<\/span>\r\n    evutil_socket_t<\/span> fd<\/span>,<\/span>\r\n    enum<\/span> bufferevent_options<\/span> options<\/span>);<\/span><\/code><\/pre>\n<\/div>\n
        options\u662f\u521b\u5efabufferevent\u4f7f\u7528\u7684\u6807\u5fd7\u7684\u63a9\u7801\uff0cfd\u662f\u5957\u63a5\u5b57\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0cbase\u662fevent_base,\u6210\u529f\u65f6\u51fd\u6570\u8fd4\u56de\u4e00\u4e2abufferevent,\u5931\u8d25\u8fd4\u56deNULL\u3002<\/p>\n
        \u542f\u52a8\u94fe\u63a5\uff1a<\/p>\n
        \n
        int<\/span> bufferevent_socket_connect<\/span>(<\/span>struct<\/span> bufferevent<\/span> *<\/span>bev<\/span>,<\/span>\r\n                            struct<\/span> sockaddr<\/span>*<\/span> address<\/span>,<\/span>\r\n                            int<\/span> addrlen<\/span>);<\/span><\/code><\/pre>\n<\/div>\n
        \u8fde\u63a5\u5b8c\u6210\u4e4b\u524d\u53ef\u4ee5\u5411\u8f93\u51fa\u7f13\u51b2\u533a\u6dfb\u52a0\u6570\u636e\u3002\u5982\u679c\u8fde\u63a5\u6210\u529f\u542f\u52a8\uff0c\u51fd\u6570\u8fd4\u56de0\uff1b\u5982\u679c\u53d1\u751f\u9519\u8bef\u5219\u8fd4\u56de-1\u3002<\/p>\n
        \u91ca\u653ebufferevent<\/p>\n
        \n
        void<\/span> bufferevent_free<\/span>(<\/span>struct<\/span> bufferevent<\/span> *<\/span>bev<\/span>);<\/span><\/code><\/pre>\n<\/div>\n
        \u91ca\u653ebufferevent\uff0cbufferevent\u5185\u90e8\u5177\u6709\u5f15\u7528\u8ba1\u6570\u3002\u5982\u679c\u91ca\u653e\u8fd8\u6709\u672a\u5904\u7406\u7684\u5ef6\u8fdf\u56de\u8c03\uff0c\u5219\u5728\u5b8c\u6210\u4e4b\u524dbufferevent\u4e0d\u4f1a\u88ab\u5220\u9664\u3002<\/p>\n
        \u64cd\u4f5c\u56de\u8c03\uff1a<\/p>\n
        \n
        typedef<\/span> void<\/span> (<\/span>*<\/span>bufferevent_data_cb<\/span>)(<\/span>struct<\/span> bufferevent<\/span> *<\/span>bev<\/span>,<\/span>\r\n                                    void<\/span> *<\/span>ctx<\/span>);<\/span>\r\ntypedef<\/span> void<\/span> (<\/span>*<\/span>bufferevent_event_cb<\/span>)(<\/span>struct<\/span> bufferevent<\/span> *<\/span>bev<\/span>,<\/span>\r\n                                    short<\/span> events<\/span>,<\/span>\r\n                                    void<\/span> *<\/span>ctx<\/span>);<\/span>\r\n\/\/\u8bbe\u7f6e\u4e00\u4e2a\u6216\u8005\u591a\u4e2a\u56de\u8c03\u51fd\u6570\uff0c\u5206\u522b\u8868\u793a\u5728\u5df2\u7ecf\u8bfb\u53d6\u8db3\u591f\u7684\u6570\u636e\uff0c\u5df2\u7ecf\u5199\u5165\u8db3\u591f\u7684\u6570\u636e\u6216\u8005\u53d1\u751f\u9519\u8bef\u65f6\u8c03\u7528\uff0c\u7981\u7528\u56de\u8c03\uff0c\u53c2\u6570\u9700\u8981\u8bbe\u7f6e\u4e3aNULL\r\n<\/span>void<\/span> bufferevent_setcb<\/span>(<\/span>struct<\/span> bufferevent<\/span> *<\/span>bufev<\/span>,<\/span>\r\n                       bufferevent_data_cb<\/span> readcb<\/span>,<\/span>\r\n                       bufferevent_data_cb<\/span> writecb<\/span>,<\/span>\r\n                      bufferevent_event_cb<\/span> eventcb<\/span>,<\/span>void<\/span>*<\/span> cbargs<\/span>);<\/span>\r\n\/\/\u83b7\u53d6bufferevent \u7684\u56de\u8c03\u51fd\u6570\r\n<\/span>void<\/span> bufferevent_getcb<\/span>(<\/span>struct<\/span> bufferevent<\/span> *<\/span>bufev<\/span>,<\/span>\r\n                      bufferevent_data_cb<\/span> *<\/span>readcb_ptr<\/span>,<\/span>\r\n                      bufferevent_data_cb<\/span> *<\/span>writecb_ptr<\/span>,<\/span>\r\n                      bufferevent_event_cb<\/span>,<\/span>*<\/span>event_ptr<\/span>,<\/span>\r\n                      void<\/span> **<\/span>cbarg_ptr<\/span>)<\/span><\/code><\/pre>\n<\/div>\n
        \u542f\u7528\u548c\u7981\u7528\u4e8b\u4ef6\uff1a<\/p>\n
        \n
        void<\/span> bufferevent_enable<\/span>(<\/span>struct<\/span> bufferevent<\/span> *<\/span>bufev<\/span>,<\/span>short<\/span> events<\/span>);<\/span>\r\nvoid<\/span> bufferevent_disable<\/span>(<\/span>struct<\/span> bufferevent<\/span> *<\/span>bufev<\/span>,<\/span>short<\/span> events<\/span>);<\/span>\r\nshort<\/span> bufferevent_get_enabled<\/span>(<\/span>struct<\/span> bufferevent<\/span> *<\/span>bufev<\/span>);<\/span><\/code><\/pre>\n<\/div>\n
        \u542f\u7528\u6216\u8005\u7981\u7528bufferevent\u4e0a\u7684EV_READ,EV_WRITE\u6216\u8005EV_READ|EV_WRITE\u4e8b\u4ef6\u3002\u6ca1\u6709\u542f\u7528\u8bfb\u53d6\u6216\u8005\u5199\u5165\u4e8b\u4ef6\u65f6bufferevent\u5c06\u4e0d\u4f1a\u8fdb\u884c\u6570\u636e\u7684\u8bfb\u53d6\u6216\u8005\u5199\u5165\uff0c\u4f7f\u7528bufferevent_get_enabled()\u83b7\u53d6bufferevent\u4e0a\u5f53\u524d\u542f\u7528\u7684\u6570\u636e\u3002<\/p>\n
        \u8bbe\u7f6e\u6c34\u4f4d\uff1a<\/p>\n
        \n
        void<\/span> bufferevent_setwatermark<\/span>(<\/span>struct<\/span> bufferevent<\/span> *<\/span>bufev<\/span>,<\/span>\r\n                             short<\/span> events<\/span>,<\/span>\r\n                             size_t<\/span> lowmark<\/span>,<\/span>\r\n                             size_t<\/span> highmark<\/span>);<\/span><\/code><\/pre>\n<\/div>\n
        \u8bbe\u7f6e\u5355\u4e2abufferevent\u7684\u8bfb\u53d6\u6c34\u4f4d\uff0c\u5199\u5165\u6c34\u4f4d\u6216\u8005\u540c\u65f6\u8c03\u6574\u4e8c\u8005\u3002\u5bf9\u4e8e\u9ad8\u6c34\u4f4d\uff0c0\u8868\u793a\u65e0\u9650\u3002<\/p>\n
        \u901a\u8fc7buffer\u5f97\u5230evbuffer<\/p>\n
        \n
        struct<\/span> evbuffer<\/span> *<\/span>bufferevent_get_input<\/span>(<\/span>struct<\/span> bufferevent<\/span>*<\/span> bufev<\/span>);<\/span>\r\nstruct<\/span> evbuffer<\/span> *<\/span>bufferevent_get_output<\/span>(<\/span>struct<\/span> bufferevent<\/span>*<\/span> bufev<\/span>);<\/span><\/code><\/pre>\n<\/div>\n
        \u5206\u522b\u8fd4\u56de\u8f93\u5165\u7f13\u51b2\u533a\u548c\u8f93\u51fa\u7f13\u51b2\u533a\u3002<\/p>\n
        \u5411bufferevent\u7684\u8f93\u51fa\u7f13\u51b2\u533a\u6dfb\u52a0\u6570\u636e<\/p>\n
        \n
        int<\/span> bufferevent_write<\/span>(<\/span>struct<\/span> bufferevent<\/span> *<\/span>bufev<\/span>,<\/span>\r\n                      const<\/span> void<\/span> *<\/span>data<\/span>,<\/span>\r\n                     size_t<\/span> size<\/span>);<\/span>\r\nint<\/span> bufferevent_write_buffer<\/span>(<\/span>struct<\/span> bufferevent<\/span> *<\/span>bufev<\/span>,<\/span>\r\n                             struct<\/span> evbuffer<\/span> *<\/span>buf<\/span>)<\/span><\/code><\/pre>\n<\/div>\n
        bufferevent_write\u5c06\u5185\u5b58\u4e2d\u4ecedata\u5904\u5f00\u59cb\u7684size\u5b57\u8282\u6570\u636e\u6dfb\u52a0\u5230\u8f93\u51fa\u7f13\u51b2\u533a\u7684\u672b\u5c3e\uff0cbuffereevent_write_buffer()\u79fb\u9664buf\u7684\u6240\u6709\u5185\u5bb9\uff0c\u5c06\u5176\u653e\u7f6e\u5230\u8f93\u51fa\u7f13\u51b2\u533a\u7684\u672b\u5c3e\u3002\u51fd\u6570\u6267\u884c\u6210\u529f\u8fd4\u56de0\uff0c\u53d1\u751f\u9519\u8bef\u65f6\u8fd4\u56de-1\u3002<\/p>\n
        \u4ecebufferevent\u8bfb\u53d6\u6570\u636e<\/p>\n
        \n
        size_t<\/span> bufferevent_read<\/span>(<\/span>struct<\/span> bufferevent<\/span> *<\/span>bufev<\/span>,<\/span>\r\n                        void<\/span>*<\/span> data<\/span>,<\/span>size_t<\/span> size<\/span>);<\/span>\r\nint<\/span> bufferevent_read_buffer<\/span>(<\/span>struct<\/span> bufferevent<\/span> *<\/span>bufev<\/span>,<\/span>\r\n                           struct<\/span> evbuffer<\/span> *<\/span>buf<\/span>);<\/span><\/code><\/pre>\n<\/div>\n
        \u8bfb\u53d6bufferevent\u4e2d\u7684\u4e0a\u8f93\u5165\u7f13\u51b2\u533a\u5185\u5bb9\u3002bufferevent_read()\u81f3\u591a\u8bfb\u53d6size\u5b57\u8282\u7684\u6570\u636e\u5230\u5185\u5b58data\u4e2d\uff0c\u51fd\u6570\u6267\u884c\u6210\u529f\u8fd4\u56de\u8bfb\u53d6\u7684\u5b57\u8282\u6570\uff1b\u800cbufferevent_read_buffer()\u5219\u8bfb\u53d6\u6240\u6709\u8f93\u5165\u7f13\u51b2\u533a\u7684\u6570\u636e\uff0c\u51fd\u6570\u6267\u884c\u6210\u529f\u8fd4\u56de0\uff0c\u5931\u8d25\u8fd4\u56de-1.<\/p>\n
        bufferevent\u7684\u6e05\u7a7a<\/p>\n
        \n
        int<\/span> bufferevent_flush<\/span>(<\/span>struct<\/span> bufferevent<\/span> *<\/span>bufev<\/span>,<\/span>\r\n                     short<\/span> iotype<\/span>,<\/span>\r\n                     enum<\/span> bufferevent_flush_mode<\/span> state<\/span>);<\/span><\/code><\/pre>\n<\/div>\n
        iotype \u53ef\u4ee5\u662fEV_READ,EV_WRITE\u6216\u8005EV_READ | EV_WRITE;<\/p>\n
        state\u53ef\u4ee5\u662fBEV_NORMAL,BEV_FLUSH,BEV_FINISHED<\/p>\n
        \u6570\u636eevbuffer<\/h3>\n
        libevent\u7684evbuffer\u5b9e\u73b0\u4e86\u4e3a\u5411\u540e\u9762\u6dfb\u52a0\u6570\u636e\u548c\u4ece\u524d\u9762\u79fb\u9664\u6570\u636e\u800c\u4f18\u5316\u7684\u5b57\u8282\u5bf9\u4e86\uff0cevbuffer\u7528\u4e8e\u5904\u7406\u7f13\u51b2\u7f51\u7edcIO\u7684”\u7f13\u51b2”\u90e8\u5206\u3002<\/p>\n
        \u521b\u5efa\u548c\u91ca\u653e<\/p>\n
        \n
        struct<\/span> evbuffer<\/span> *<\/span>evbuffer_new<\/span>(<\/span>void<\/span>);<\/span>\r\nvoid<\/span> evbuffer_free<\/span>(<\/span>struct<\/span> evbuffer<\/span> *<\/span>buf<\/span>);<\/span><\/code><\/pre>\n<\/div>\n
        evbuffer_new()\u5206\u914d\u548c\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684evbuffer,evbuffer_free()\u91ca\u653eevbuffer\u548c\u5176\u5185\u5bb9\u3002<\/p>\n
        \u7ebf\u7a0b\u5b89\u5168\u7684\u8bbe\u7f6e<\/p>\n
        \n
        int<\/span> evbuffer_enable_locking<\/span>(<\/span>struct<\/span> evbuffer<\/span>*<\/span> buf<\/span>,<\/span>void<\/span> *<\/span>lock<\/span>);<\/span>\r\nvoid<\/span> evbuffer_lock<\/span>(<\/span>struct<\/span> evbuffer<\/span> *<\/span>buf<\/span>);<\/span>\r\nvoid<\/span> evbuffer_unlock<\/span>(<\/span>struct<\/span> evbuffer<\/span>*<\/span> buf<\/span>);<\/span><\/code><\/pre>\n<\/div>\n
        \u9ed8\u8ba4\u60c5\u51b5\u4e0bevbuffer\u662f\u7ebf\u7a0b\u4e0d\u5b89\u5168\u7684\u3002\u5982\u679c\u5728evbuffer_enable_lock()\u4e2d\u7684lock\u4e3aNULL,\u90a3\u4e48\u5c31\u4f1aevthread_set_lock_creation_callback \u63d0\u4f9b\u7684\u9501\u521b\u5efa\u51fd\u6570\u521b\u5efa\u4e00\u4e2a\u9501\uff0c\u8d1f\u8d23libevent\u5c06\u4f7f\u7528lock\u9501\u3002evbuffer_lock()\u548c evbuffer_unlock()\u51fd\u6570\u5206\u522b\u8bf7\u6c42\u548c\u91ca\u653e evbuffer \u4e0a\u7684\u9501\u3002<\/p>\n<\/div>\n<\/div>\n
        \u53d1\u5e03\u4e8e 08-04<\/div>\n
        \n
        \n
        \n
        \n
        Libevent<\/div>\n<\/div>\n<\/div>\n
        \n
        \n
        \u9ad8\u6027\u80fd<\/div>\n<\/div>\n<\/div>\n
        \n
        \n
        Linux<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
        \n
        \n