{"id":44313,"date":"2023-07-08T02:26:24","date_gmt":"2023-05-12T04:41:58","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/c%e5%92%8cgolang%e4%b9%8b%e9%97%b4%e7%9a%84%e7%95%8c%e9%99%90\/"},"modified":"2024-04-30T12:33:04","modified_gmt":"2024-04-30T04:33:04","slug":"c%e5%92%8cgolang%e4%b9%8b%e9%97%b4%e7%9a%84%e7%95%8c%e9%99%90","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/c%e5%92%8cgolang%e4%b9%8b%e9%97%b4%e7%9a%84%e7%95%8c%e9%99%90\/","title":{"rendered":"C\u548cGolang\u4e4b\u95f4\u7684\u754c\u9650"},"content":{"rendered":"

\u56e0\u4e3a\u53c2\u4e0e\u7f16\u5199C\u8bed\u8a00Advent Calendar 2016\u7684\u4eba\u5f88\u5c11\uff0c\u6240\u4ee5\u6211\u60f3\u8d77\u4e86\u5f53\u521d\u63a5\u89e6C\u8bed\u8a00\u7684\u65f6\u5019\uff0c\u60f3\u8981\u5199\u4e0b\u6765\u8bd5\u8bd5\u770b\u3002<\/p>\n

\u4ece\u8fd9\u91cc\u5f00\u59cb<\/h1>\n

\u4e0a\u6b21\u6211\u4eec\u4ecb\u7ecd\u4e86\u4e00\u4e2a\u652f\u6301\u591a\u5e73\u53f0\u7684Golang\u5e93\uff0c\u5b9e\u9645\u4e0a\uff0c\u5728\u4f7f\u7528\u5171\u4eabC\u5e93\u7684\u673a\u4f1a\u4e0a\u6709\u591a\u5927\u7684\u8303\u56f4\u5462\uff1f<\/p>\n

Go\u652f\u6301\u4e0e\u540d\u4e3acgo\u7684C\/C++\u5e93\u8fdb\u884c\u534f\u4f5c\uff0c\u53ef\u4ee5\u8f7b\u677e\u5730\u4eceGo\u4e2d\u8c03\u7528C\/C++\u7684API\u3002<\/p>\n

\u7136\u800c\uff0c\u4eceC\/C++\u8c03\u7528Go\u7684\u80fd\u529b\u76f8\u5f53\u6709\u9650\uff0c\u4e3b\u8981\u4f7f\u7528\u60c5\u51b5\u53ef\u80fd\u4ec5\u9650\u4e8e\u5e0c\u671b\u4ece\u5176\u4ed6\u7f16\u7a0b\u8bed\u8a00\u4f7f\u7528Go\u5b9e\u73b0\u7684\u529f\u80fd\u7684\u60c5\u51b5\u3002<\/p>\n

\u66f4\u5177\u4f53\u4e00\u70b9\u6765\u8bf4\uff0c\u56e0\u4e3a\u5c06Go\u5f00\u53d1\u7684\u529f\u80fd\u79fb\u690d\u5230\u5176\u4ed6\u8bed\u8a00\u4f1a\u5f88\u9ebb\u70e6\uff0c\u6240\u4ee5\u6211\u4eec\u51b3\u5b9a\u5c06\u5176\u8f6c\u5316\u4e3ac-shared\u5e93\uff0c\u4ee5\u4fbf\u4ece\u5176\u4ed6\u8bed\u8a00\u4e2d\u8c03\u7528\u3002
\nc-shared\u662fC\u7684\u63a5\u53e3\uff0c\u56e0\u6b64\u4e0d\u4ec5\u9650\u4e8eC\/C++\uff0c\u53ef\u4ee5\u5728\u5176\u4ed6\u8bed\u8a00\u4e2d\u901a\u8fc7C\u7684\u63a5\u53e3\u8fdb\u884c\u534f\u4f5c\uff0c\u5982\u4e0b\u6240\u793a\u7684\u793a\u4f8b\u3002<\/p>\n

(1) Java -> JNI -> \u5171\u4eabC\u5e93 -> Go
\n(2) JavaScript -> Node\uff08\u672c\u5730\u6269\u5c55\uff09-> \u5171\u4eabC\u5e93 -> Go
\n(3) ActionScript -> ANE -> \u5171\u4eabC\u5e93 -> Go<\/p>\n

c-shared\u7684\u793a\u4f8b<\/h1>\n

\u5f53\u6211\u5728 Github \u4e0a\u641c\u7d22\u4f7f\u7528 c-shared \u7684\u9879\u76ee\u65f6\uff0c\u6211\u53d1\u73b0\u4e86\u4e00\u4e9b\u4e0d\u9519\u7684\u9009\u9879\u3002<\/p>\n

\u5728github.com\u7f51\u7ad9\u4e0a\u641c\u7d22\u5173\u952e\u8bcd\u662f\u201cc-shared buildmode\u201d\uff0c\u4f46\u6392\u9664\u5173\u952e\u8bcd\u201cgolang\u201d\u3002<\/p>\n

Gohttplib (\u9ad8\u901fHTTP\u5e93)<\/h2>\n

\u5728\u4e00\u4e2a\u4eceC\/Python\u8c03\u7528Go\u7684httpserver\u7684\u9879\u76ee\u4e2d\uff0c\u8fd9\u4f3c\u4e4e\u662fPYCON2016\u4e0a\u6f14\u8bb2\u7684\u4e00\u4e2a\u8bdd\u9898\u3002<\/p>\n

\u8ba9\u6211\u4eec\u67e5\u770b\u901a\u8fc7c-shared\u751f\u6210\u7684\u5934\u6587\u4ef6\u3002<\/p>\n

\r\ntypedef<\/span> struct<\/span> Request_<\/span>\r\n{<\/span>\r\n  const<\/span> char<\/span> *<\/span>Method<\/span>;<\/span>\r\n  const<\/span> char<\/span> *<\/span>Host<\/span>;<\/span>\r\n  const<\/span> char<\/span> *<\/span>URL<\/span>;<\/span>\r\n  const<\/span> char<\/span> *<\/span>Body<\/span>;<\/span>\r\n  const<\/span> char<\/span> *<\/span>Headers<\/span>;<\/span>\r\n}<\/span> Request<\/span>;<\/span>\r\n\r\ntypedef<\/span> unsigned<\/span> int<\/span> ResponseWriterPtr<\/span>;<\/span>\r\n\r\ntypedef<\/span> void<\/span> FuncPtr<\/span>(<\/span>ResponseWriterPtr<\/span> w<\/span>,<\/span> Request<\/span> *<\/span>r<\/span>);<\/span>\r\n\r\nextern<\/span> void<\/span> Call_HandleFunc<\/span>(<\/span>ResponseWriterPtr<\/span> w<\/span>,<\/span> Request<\/span> *<\/span>r<\/span>,<\/span> FuncPtr<\/span> *<\/span>fn<\/span>);<\/span>\r\n\r\n...<\/span>\r\n\r\nextern<\/span> void<\/span> ListenAndServe<\/span>(<\/span>char<\/span>*<\/span> p0<\/span>);<\/span>\r\n\r\nextern<\/span> void<\/span> HandleFunc<\/span>(<\/span>char<\/span>*<\/span> p0<\/span>,<\/span> FuncPtr<\/span>*<\/span> p1<\/span>);<\/span>\r\n\r\nextern<\/span> int<\/span> ResponseWriter_Write<\/span>(<\/span>unsigned<\/span> int<\/span> p0<\/span>,<\/span> char<\/span>*<\/span> p1<\/span>,<\/span> int<\/span> p2<\/span>);<\/span>\r\n\r\nextern<\/span> void<\/span> ResponseWriter_WriteHeader<\/span>(<\/span>unsigned<\/span> int<\/span> p0<\/span>,<\/span> int<\/span> p1<\/span>);<\/span>\r\n\r\n<\/code><\/pre>\n
\u6ce8\u76ee\u7684\u662f\uff0cc-shared\u529f\u80fd\u5168\u90e8\u662f\u7531C\u7684\u57fa\u672c\u7c7b\u578b\u6216C\u7684\u7ed3\u6784\u4f53\u6784\u6210\u7684\u3002<\/p>\n
\u6700\u8fd1\u7684libgo\u4e0e\u4ee5\u524d\u76f8\u6bd4\u5dee\u522b\u5f88\u5927\u3002
\n\u5728\u4ee5\u524d\u7684libgo\u4e2d\uff0cGo\u7684ptr\u53ef\u4ee5\u76f4\u63a5\u4eceC\u7684\u4e16\u754c\u4e2d\u5f15\u7528\uff0c
\n\u8fd9\u5bfc\u81f4\u5728\u8fd0\u884c\u65f6\u7ecf\u5e38\u4f1a\u6536\u5230cgocheck\u7684\u8b66\u544a\u3002
\n\u203b GODEBUG=cgocheck=0\u53ef\u4ee5\u7981\u7528\u6b64\u5904\u7406\u3002<\/p>\n
struct<\/span> request_return<\/span> {<\/span>\r\n  GoSlice<\/span> r0<\/span>;<\/span>\r\n  GoInterface<\/span> r1<\/span>;<\/span>\r\n};<\/span>\r\n\r\nextern<\/span> struct<\/span> request_return<\/span> request<\/span>(<\/span>GoString<\/span> p0<\/span>);<\/span>\r\n\r\n<\/code><\/pre>\n
\u7531\u4e8e\u6240\u6709c-shared\u51fd\u6570\u90fd\u88ab\u79fb\u5230C\u7aef\uff0c\u56e0\u6b64\u6240\u6709\u79fb\u52a8\u7684\u5904\u7406\u90fd\u5728Go(cgo)\u4e2d\u8fdb\u884c\u7f16\u5199\u3002<\/p>\n
\/\/export HandleFunc<\/span>\r\nfunc<\/span> HandleFunc<\/span>(<\/span>cpattern<\/span> *<\/span>C<\/span>.<\/span>char<\/span>,<\/span> cfn<\/span> *<\/span>C<\/span>.<\/span>FuncPtr<\/span>)<\/span> {<\/span>\r\n  \/\/ C-friendly wrapping for our http.HandleFunc call.<\/span>\r\n  pattern<\/span> :=<\/span> C<\/span>.<\/span>GoString<\/span>(<\/span>cpattern<\/span>)<\/span>\r\n  http<\/span>.<\/span>HandleFunc<\/span>(<\/span>pattern<\/span>,<\/span> func<\/span>(<\/span>w<\/span> http<\/span>.<\/span>ResponseWriter<\/span>,<\/span> req<\/span> *<\/span>http<\/span>.<\/span>Request<\/span>)<\/span> {<\/span>\r\n...<\/span>\r\n  \/\/ Convert the ResponseWriter interface instance to an opaque C integer<\/span>\r\n  \/\/ that we can safely pass along.<\/span>\r\n  wPtr<\/span> :=<\/span> cpointers<\/span>.<\/span>Ref<\/span>(<\/span>unsafe<\/span>.<\/span>Pointer<\/span>(<\/span>&<\/span>w<\/span>))<\/span>\r\n  \/\/ Call our C function pointer using our C shim.<\/span>\r\n  C<\/span>.<\/span>Call_HandleFunc<\/span>(<\/span>C<\/span>.<\/span>ResponseWriterPtr<\/span>(<\/span>wPtr<\/span>),<\/span> &<\/span>creq<\/span>,<\/span> cfn<\/span>)<\/span>\r\n  \/\/ release the C memory<\/span>\r\n  C<\/span>.<\/span>free<\/span>(<\/span>unsafe<\/span>.<\/span>Pointer<\/span>(<\/span>creq<\/span>.<\/span>Method<\/span>))<\/span>\r\n  C<\/span>.<\/span>free<\/span>(<\/span>unsafe<\/span>.<\/span>Pointer<\/span>(<\/span>creq<\/span>.<\/span>Host<\/span>))<\/span>\r\n  C<\/span>.<\/span>free<\/span>(<\/span>unsafe<\/span>.<\/span>Pointer<\/span>(<\/span>creq<\/span>.<\/span>URL<\/span>))<\/span>\r\n  C<\/span>.<\/span>free<\/span>(<\/span>unsafe<\/span>.<\/span>Pointer<\/span>(<\/span>creq<\/span>.<\/span>Body<\/span>))<\/span>\r\n  C<\/span>.<\/span>free<\/span>(<\/span>unsafe<\/span>.<\/span>Pointer<\/span>(<\/span>creq<\/span>.<\/span>Headers<\/span>))<\/span>\r\n  ...<\/span>\r\n\r\n<\/code><\/pre>\n
\/\/export ResponseWriter_WriteHeader<\/span>\r\nfunc<\/span> ResponseWriter_WriteHeader<\/span>(<\/span>wPtr<\/span> C<\/span>.<\/span>uint<\/span>,<\/span> header<\/span> C<\/span>.<\/span>int<\/span>)<\/span> {<\/span>\r\n  w<\/span>,<\/span> ok<\/span> :=<\/span> cpointers<\/span>.<\/span>Deref<\/span>(<\/span>wPtr<\/span>)<\/span>\r\n  if<\/span> !<\/span>ok<\/span> {<\/span>\r\n    return<\/span>\r\n  }<\/span>\r\n  (<\/span>*<\/span>(<\/span>*<\/span>http<\/span>.<\/span>ResponseWriter<\/span>)(<\/span>w<\/span>))<\/span>.<\/span>WriteHeader<\/span>(<\/span>int<\/span>(<\/span>header<\/span>))<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u6709\u8da3\u7684\u662fPtrProxy\u901a\u8fc7\u4e00\u7ea7\u95f4\u63a5\u5f15\u7528\u6765\u64cd\u4f5c\u3002
\nref()\u3001deref()\u3001free()\u7b49\u51fd\u6570\u8d1f\u8d23(resource\u7684id\uff0cGo ptr)\u7684\u6ce8\u518c\u3001\u5f15\u7528\u548c\u5220\u9664\u3002<\/p>\n
type<\/span> ptrProxy<\/span> struct<\/span> {<\/span>\r\n  sync<\/span>.<\/span>Mutex<\/span>\r\n  count<\/span>  uint<\/span>\r\n  lookup<\/span> map<\/span>[<\/span>uint<\/span>]<\/span>unsafe<\/span>.<\/span>Pointer<\/span>\r\n}<\/span>\r\n\/\/ Ref registers the given pointer and returns a corresponding id that can be<\/span>\r\n\/\/ used to retrieve it later.<\/span>\r\nfunc<\/span> (<\/span>p<\/span> *<\/span>ptrProxy<\/span>)<\/span> Ref<\/span>(<\/span>ptr<\/span> unsafe<\/span>.<\/span>Pointer<\/span>)<\/span> C<\/span>.<\/span>uint<\/span>\r\n\/\/ Deref takes an id and returns the corresponding pointer if it exists.<\/span>\r\nfunc<\/span> (<\/span>p<\/span> *<\/span>ptrProxy<\/span>)<\/span> Deref<\/span>(<\/span>id<\/span> C<\/span>.<\/span>uint<\/span>)<\/span> (<\/span>unsafe<\/span>.<\/span>Pointer<\/span>,<\/span> bool<\/span>)<\/span>\r\n\/\/ Free releases a registered pointer by its id.<\/span>\r\nfunc<\/span> (<\/span>p<\/span> *<\/span>ptrProxy<\/span>)<\/span> Free<\/span>(<\/span>id<\/span> C<\/span>.<\/span>uint<\/span>)<\/span>\r\n<\/code><\/pre>\n
cgocheck\u7684\u7ed5\u8fc7\u65b9\u5f0f<\/h1>\n
\u5982\u679c\u5c06\u5728Go\u4fa7\u5206\u914d\u7684\u8d44\u6e90\u6307\u9488\u76f4\u63a5\u4f20\u9012\u7ed9C\u4fa7\uff0c
\n\u6709\u53ef\u80fd\u56e0\u4e3aGo\u7684\u5783\u573e\u56de\u6536\u5668\uff08GC\uff09\u79fb\u52a8\u8d44\u6e90\u6216\u8005\u4e0d\u77e5\u9053C\u4f1a\u5f15\u7528\u8be5\u8d44\u6e90\uff0c
\n\u5bfc\u81f4\u5728GC\u8fd0\u884c\u4e2d\u88ab\u610f\u5916\u5220\u9664\uff0c\u4ece\u800c\u5728\u4e0d\u5e0c\u671b\u7684\u65f6\u523b\u51fa\u73b0\u6bb5\u9519\u8bef\uff08SEGV\uff09\u95ee\u9898\u3002
\n* \u8fd9\u4e2a\u95ee\u9898\u5e94\u8be5\u5728\u6539\u8fdb\u8fc7\u7684Go1.5\u53ca\u4ee5\u540e\u7684\u7248\u672c\u4e2d\u53d1\u751f\u3002<\/p>\n
\u4e3a\u4e86\u6392\u9664\u6b64\u7c7b\u53ef\u80fd\u6027\uff0ccgocheck\u5b58\u5728\uff0c\u800c\u4e14\u5982\u679c\u5728\u8d44\u6e90\u5206\u914d\u540e\u51e0\u4e4e\u4e0d\u592a\u53ef\u80fd\u89e6\u53d1\u5783\u573e\u56de\u6536\uff0c
\n\u6240\u4ee5libgo\u6709\u70b9\u80fd\u591f\u6b63\u5e38\u5de5\u4f5c\u3002<\/p>\n
\u5982\u679c\u8981\u4f7f\u7528c-shared\u6765\u8c03\u7528Go\uff0c\u5c31\u9700\u8981\u907f\u514d\u8fd9\u4e2a\u95ee\u9898\u5e76\u7f16\u5199\u4ee3\u7801\u3002<\/p>\n
\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u53ef\u80fd\u9700\u8981\u4eceC\u7aef\u8c03\u7528Go\u7aef\uff0c\u4f46\u540c\u65f6\u4e5f\u53ef\u80fd\u9700\u8981\u4eceGo\u7aef\u8c03\u7528C\u7aef\u7684\u56de\u8c03\u51fd\u6570\u3002<\/p>\n
\u7531\u4e8e\u4e8b\u60c5\u6709\u70b9\u590d\u6742\uff0c\u63d0\u524d\u6574\u7406\u4e00\u4e0b\uff1a cgo\u53ef\u4ee5\u5728Go\u6e90\u4ee3\u7801\u4e2d\u4f7f\u7528\u6ce8\u91ca\u7f16\u5199\uff0c\u4e5f\u53ef\u4ee5\u7f16\u5199\u4e3a\u72ec\u7acb\u7684C\/C++\u6e90\u4ee3\u7801\uff0c\u6700\u7ec8\u5c06\u88ab\u6784\u5efa\u4e3aGo\u7684\u5e93\u3002<\/p>\n
c-shared   main or wrapper\r\n+---------+----------------+\r\n| Go, cgo | C\/C++          |\r\n+---------+----------------+\r\n<\/code><\/pre>\n
\u7b56\u7565\u907f\u514d\uff081\uff09<\/h2>\n
\u7531\u4e8e\u76f4\u63a5\u5c06\u5728Go\u4fa7\u5206\u914d\u7684\u8d44\u6e90\u6307\u9488\u4f20\u9012\u7ed9C\u4fa7\u662f\u4e0d\u597d\u7684\uff0c\u6240\u4ee5\u50cfgohttplib\u8fd9\u6837\u7684\u65b9\u6cd5\u662f\u6709\u6548\u7684\u3002\u5728gohttplib\u4e2d\uff0c\u901a\u8fc7\u5728Go\u4fa7\u4f7f\u7528map\u6765\u7ba1\u7406\u5df2\u5206\u914d\u7684\u8d44\u6e90\u6307\u9488\uff0c\u5e76\u901a\u8fc7\u5c06map\u7684ID\u4f20\u9012\u7ed9C\u4fa7\u6765\u907f\u514d\u95ee\u9898\u3002\u8fd9\u79cd\u65b9\u6cd5\u7c7b\u4f3c\u4e8e\u5c06Go\u4fa7\u7684\u8d44\u6e90\u89c6\u4e3a\u4e0d\u900f\u660e\u6307\u9488\u3002<\/p>\n
\u4f18\u70b9<\/h3>\n
\u4f7f\u7528ptrproxy\u53ef\u4ee5\u65b9\u4fbf\u5730\u5c06Go\u8d44\u6e90\u8f6c\u6362\u4e3aC\u8d44\u6e90\u3002<\/p>\n
\u7f3a\u70b9 (qu\u0113<\/h3>\n
\u7531\u4e8emap\u957f\u65f6\u95f4\u6301\u6709\uff08id\uff0cGo ptr\uff09\u5e76\u4e14\u6ca1\u6709\u91ca\u653e\u8d44\u6e90\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u8d44\u6e90\u6cc4\u6f0f\uff0c\u56e0\u6b64\u9700\u8981\u5728\u9002\u5f53\u7684\u65f6\u673a\u91ca\u653e\u8d44\u6e90\u3002
\n\u5728gohttplib\u4e2d\uff0c\u901a\u8fc7\u663e\u5f0f\u7684free\u8c03\u7528\u6765\u4ecemap\u4e2d\u5220\u9664\u5e76\u6807\u8bb0\u4e3aGC\u5bf9\u8c61\u3002<\/p>\n
\u53e6\u5916\uff0c\u7531\u4e8e\u5f15\u7528\u4e86map\uff0c\u6240\u4ee5\u5728\u8c03\u7528\u524d\u540e\u4f1a\u4ea7\u751f\u76f8\u5f53\u5927\u7684\u5f00\u9500\u3002\u5982\u679c\u60f3\u907f\u514dGo\u548cC\u4e4b\u95f4\u7684\u8fb9\u754c\u5f00\u9500\uff0c\u5efa\u8bae\u5728\u5176\u4e2d\u4e00\u5c42\u5b9e\u73b0\u65f6\u8003\u8651\u6027\u80fd\u3002<\/p>\n
\u907f\u514d\u65b9\u6cd5(2)<\/h2>\n
\u5c06\u5728Go\u4fa7\u5206\u914d\u7684\u8d44\u6e90\u6307\u9488\u76f4\u63a5\u4f20\u9012\u7ed9C\u4fa7\u662f\u884c\u4e0d\u901a\u7684\uff0c\u4f46\u662f\u901a\u8fc7cgo\u51fd\u6570\u7684\u53c2\u6570\u6307\u5b9a\u7684\u6307\u9488\u5c06\u53d7\u5230GC\u7684\u4fdd\u62a4\u3002
\n\u56e0\u6b64\uff0c\u5728cgo\u7684\u53c2\u6570\u4e2d\u5c06Go\u7684\u8d44\u6e90\u4f20\u9012\u7ed9C\u4fa7\u662f\u6709\u6548\u7684\u65b9\u6cd5\u3002<\/p>\n
\u4f18\u70b9<\/h3>\n
\u53ef\u4ee5\u81ea\u7136\u5730\u4f5c\u4e3acgo\u7f16\u5199\u3002<\/p>\n
\u7f3a\u70b9<\/h3>\n
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