{"id":3251,"date":"2019-05-14T11:19:17","date_gmt":"2019-05-14T03:19:17","guid":{"rendered":"https:\/\/damogame.cn\/wordpress\/?p=3251"},"modified":"2019-05-14T11:19:17","modified_gmt":"2019-05-14T03:19:17","slug":"setjmp-%e5%92%8c-longjmp-%e5%87%bd%e6%95%b0%e4%bd%bf%e7%94%a8%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/i007.cc\/wordpress\/archives\/3251","title":{"rendered":"setjmp \u548c longjmp \u51fd\u6570\u4f7f\u7528\u8be6\u89e3"},"content":{"rendered":"
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\u539f\u6587\u51fa\u5904\uff1a \u5927\u7c73\u7c92ing<\/a><\/p>\n<\/div>\n

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\u5728\u7f51\u4e0a\u770b\u5230\u7684\uff0c\u89c9\u5f97\u5f88\u6709\u7528\uff0ccopy\u8fc7\u6765\u7684\u3002<\/p>\n

\u975e\u5c40\u90e8\u8df3\u8f6c\u8bed\u53e5\u2014setjmp\u548clongjmp\u51fd\u6570\u3002\u975e\u5c40\u90e8\u6307\u7684\u662f\uff0c\u8fd9\u4e0d\u662f\u7531\u666e\u901aC\u8bed\u8a00goto\uff0c\u8bed\u53e5\u5728\u4e00\u4e2a\u51fd\u6570\u5185\u5b9e\u65bd\u7684\u8df3\u8f6c\uff0c\u800c\u662f\u5728\u6808\u4e0a\u8df3\u8fc7\u82e5\u5e72\u8c03\u7528\u5e27\uff0c\u8fd4\u56de\u5230\u5f53\u524d\u51fd\u6570\u8c03\u7528\u8def\u5f84\u4e0a\u7684\u67d0\u4e00\u4e2a\u51fd\u6570\u4e2d\u3002<\/p>\n

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#include <setjmp.h><\/span><\/div>\n
Int<\/span> setjmp<\/span>(<\/span>jmp_buf\u00a0\u00a0<\/span>env<\/span>)<\/span>;<\/span><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

\u8fd4\u56de\u503c\uff1a\u82e5\u76f4\u63a5\u8c03\u7528\u5219\u8fd4\u56de0\uff0c\u82e5\u4ecelongjmp\u8c03\u7528\u8fd4\u56de\u5219\u8fd4\u56de\u975e0\u503c\u7684longjmp\u4e2d\u7684val\u503c<\/p>\n

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void<\/span> longjmp<\/span>(<\/span>jmp_buf <\/span>env<\/span>,<\/span>int<\/span> val<\/span>)<\/span>;<\/span><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

\u8c03\u7528\u6b64\u51fd\u6570\u5219\u8fd4\u56de\u5230\u8bed\u53e5setjmp\u6240\u5728\u7684\u5730\u65b9\uff0c\u5176\u4e2denv \u5c31\u662fsetjmp\u4e2d\u7684 env\uff0c\u800cval \u5219\u662f\u4f7fsetjmp\u7684\u8fd4\u56de\u503c\u53d8\u4e3aval\u3002<\/p>\n

\u5f53\u68c0\u67e5\u5230\u4e00\u4e2a\u9519\u8bef\u65f6,\u5219\u4ee5\u4e24\u4e2a\u53c2\u6570\u8c03\u7528longjmp\u51fd\u6570\uff0c\u7b2c\u4e00\u4e2a\u5c31\u662f\u5728\u8c03\u7528setjmp\u65f6\u6240\u7528\u7684env\uff0c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u5177\u6709\u975e0\u503c\u7684val\uff0c\u5b83\u5c06\u6210\u4e3a\u4ecesetjmp\u5904\u8fd4\u56de\u7684\u503c\u3002\u4f7f\u7528\u7b2c\u4e8c\u4e2a\u53c2\u6570\u7684\u539f\u56e0\u662f\u5bf9\u4e8e\u4e00\u4e2asetjmp\u53ef\u4ee5\u6709\u591a\u4e2alongjmp\u3002<\/p>\n

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#include <stdio.h>\u00a0\u00a0<\/span><\/div>\n
#include <setjmp.h>\u00a0\u00a0<\/span><\/div>\n
\u00a0\u00a0 <\/span><\/div>\n
static<\/span> jmp_buf <\/span>buf<\/span>;<\/span>\u00a0\u00a0<\/span><\/div>\n
\u00a0\u00a0 <\/span><\/div>\n
void<\/span> second<\/span>(<\/span>void<\/span>)<\/span> {<\/span>\u00a0\u00a0<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>printf<\/span>(<\/span>“second\\n”<\/span>)<\/span>;<\/span>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>\/\/ \u6253\u5370\u00a0\u00a0<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>longjmp<\/span>(<\/span>buf<\/span>,<\/span>1<\/span>)<\/span>;<\/span>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>\/\/ \u8df3\u56desetjmp\u7684\u8c03\u7528\u5904 – \u4f7f\u5f97setjmp\u8fd4\u56de\u503c\u4e3a1\u00a0\u00a0<\/span><\/div>\n
}<\/span>\u00a0\u00a0<\/span><\/div>\n
\u00a0\u00a0 <\/span><\/div>\n
void<\/span> first<\/span>(<\/span>void<\/span>)<\/span> {<\/span>\u00a0\u00a0<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>second<\/span>(<\/span>)<\/span>;<\/span>\u00a0\u00a0<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>printf<\/span>(<\/span>“first\\n”<\/span>)<\/span>;<\/span>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>\/\/ \u4e0d\u53ef\u80fd\u6267\u884c\u5230\u6b64\u884c\u00a0\u00a0<\/span><\/div>\n
}<\/span>\u00a0\u00a0<\/span><\/div>\n
\u00a0\u00a0 <\/span><\/div>\n
int<\/span> main<\/span>(<\/span>)<\/span> {<\/span>\u00a0\u00a0\u00a0\u00a0 <\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>if<\/span> (<\/span> !<\/span> setjmp<\/span>(<\/span>buf<\/span>)<\/span> )<\/span> {<\/span>\u00a0\u00a0<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>first<\/span>(<\/span>)<\/span>;<\/span>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>\/\/ \u8fdb\u5165\u6b64\u884c\u524d\uff0csetjmp\u8fd4\u56de0\u00a0\u00a0<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span> else<\/span> {<\/span>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>\/\/ \u5f53longjmp\u8df3\u8f6c\u56de\uff0csetjmp\u8fd4\u56de1\uff0c\u56e0\u6b64\u8fdb\u5165\u6b64\u884c\u00a0\u00a0<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>printf<\/span>(<\/span>“main\\n”<\/span>)<\/span>;<\/span>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>\/\/ \u6253\u5370\u00a0\u00a0<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span>\u00a0\u00a0<\/span><\/div>\n
\u00a0\u00a0 <\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>return<\/span> 0<\/span>;<\/span>\u00a0\u00a0<\/span><\/div>\n
}<\/span><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

\u4e0a\u8ff0\u7a0b\u5e8f\u5c06\u8f93\u51fa:<\/p>\n

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\u6ce8\u610f\u5230\u867d\u7136first()<\/code>\u5b50\u7a0b\u5e8f\u88ab\u8c03\u7528\uff0c\u201dfirst<\/code>\u201c\u4e0d\u53ef\u80fd\u88ab\u6253\u5370\u3002\u201dmain<\/code>\u201c\u88ab\u6253\u5370\uff0c\u56e0\u4e3a\u6761\u4ef6\u8bed\u53e5if (\u00a0! setjmp(buf) )<\/code>\u88ab\u6267\u884c\u7b2c\u4e8c\u6b21\u3002<\/p>\n

\u4f7f\u7528setjmp\u548clongjmp\u8981\u6ce8\u610f\u4ee5\u4e0b\u51e0\u70b9\uff1a<\/p>\n

1\u3001setjmp\u4e0elongjmp\u7ed3\u5408\u4f7f\u7528\u65f6\uff0c\u5b83\u4eec\u5fc5\u987b\u6709\u4e25\u683c\u7684\u5148\u540e\u6267\u884c\u987a\u5e8f\uff0c\u4e5f\u5373\u5148\u8c03\u7528setjmp\u51fd\u6570\uff0c\u4e4b\u540e\u518d\u8c03\u7528longjmp\u51fd\u6570\uff0c\u4ee5\u6062\u590d\u5230\u5148\u524d\u88ab\u4fdd\u5b58\u7684\u201c\u7a0b\u5e8f\u6267\u884c\u70b9\u201d\u3002\u5426\u5219\uff0c\u5982\u679c\u5728setjmp\u8c03\u7528\u4e4b\u524d\uff0c\u6267\u884clongjmp\u51fd\u6570\uff0c\u5c06\u5bfc\u81f4\u7a0b\u5e8f\u7684\u6267\u884c\u6d41\u53d8\u7684\u4e0d\u53ef\u9884\u6d4b\uff0c\u5f88\u5bb9\u6613\u5bfc\u81f4\u7a0b\u5e8f\u5d29\u6e83\u800c\u9000\u51fa<\/p>\n

2.\u00a0 longjmp\u5fc5\u987b\u5728setjmp\u8c03\u7528\u4e4b\u540e\uff0c\u800c\u4e14longjmp\u5fc5\u987b\u5728setjmp\u7684\u4f5c\u7528\u57df\u4e4b\u5185\u3002\u5177\u4f53\u6765\u8bf4\uff0c\u5728\u4e00\u4e2a\u51fd\u6570\u4e2d\u4f7f\u7528setjmp\u6765\u521d\u59cb\u5316\u4e00\u4e2a\u5168\u5c40\u6807\u53f7\uff0c\u7136\u540e\u53ea\u8981\u8be5\u51fd\u6570\u672a\u66fe\u8fd4\u56de\uff0c\u90a3\u4e48\u5728\u5176\u5b83\u4efb\u4f55\u5730\u65b9\u90fd\u53ef\u4ee5\u901a\u8fc7longjmp\u8c03\u7528\u6765\u8df3\u8f6c\u5230 setjmp\u7684\u4e0b\u4e00\u6761\u8bed\u53e5\u6267\u884c\u3002\u5b9e\u9645\u4e0asetjmp\u51fd\u6570\u5c06\u53d1\u751f\u8c03\u7528\u5904\u7684\u5c40\u90e8\u73af\u5883\u4fdd\u5b58\u5728\u4e86\u4e00\u4e2ajmp_buf\u7684\u7ed3\u6784\u5f53\u4e2d\uff0c\u53ea\u8981\u4e3b\u8c03\u51fd\u6570\u4e2d\u5bf9\u5e94\u7684\u5185\u5b58\u672a\u66fe\u91ca\u653e \uff08\u51fd\u6570\u8fd4\u56de\u65f6\u5c40\u90e8\u5185\u5b58\u5c31\u5931\u6548\u4e86\uff09\uff0c\u90a3\u4e48\u5728\u8c03\u7528longjmp\u7684\u65f6\u5019\u5c31\u53ef\u4ee5\u6839\u636e\u5df2\u4fdd\u5b58\u7684jmp_buf\u53c2\u6570\u6062\u590d\u5230setjmp\u7684\u5730\u65b9\u6267\u884c\u3002<\/p>\n

\u5f02\u5e38\u5904\u7406<\/span><\/h3>\n

\u5728\u4e0b\u4f8b\u4e2d\uff0csetjmp<\/code>\u88ab\u7528\u4e8e\u5305\u4f4f\u4e00\u4e2a\u4f8b\u5916\u5904\u7406\uff0c\u7c7b\u4f3ctry<\/code><\/a>\u3002longjmp<\/code>\u8c03\u7528\u7c7b\u4f3c\u4e8ethrow<\/code>\u8bed\u53e5\uff0c\u5141\u8bb8\u4e00\u4e2a\u5f02\u5e38\u8fd4\u56de\u7ed9setjmp<\/code>\u4e00\u4e2a\u5f02\u5e38\u503c\u3002\u4e0b\u5c5e\u4ee3\u7801\u793a\u4f8b\u9075\u4ece1999 ISO C standard<\/a>\u4e0eSingle UNIX Specification<\/a>\uff1a\u4ec5\u5728\u7279\u5b9a\u8303\u56f4\u5185\u5f15\u7528setjmp<\/code><\/p>\n