{"id":341,"date":"2016-08-01T22:26:10","date_gmt":"2016-08-01T14:26:10","guid":{"rendered":"http:\/\/www.5x44.cn\/?p=341"},"modified":"2016-08-01T22:26:10","modified_gmt":"2016-08-01T14:26:10","slug":"setjmp%e5%92%8clongjmp%e5%87%bd%e6%95%b0","status":"publish","type":"post","link":"https:\/\/www.5x44.cn\/?p=341","title":{"rendered":"setjmp\u548clongjmp\u51fd\u6570"},"content":{"rendered":"

\u5728C\u8bed\u8a00\u4e2d\uff0c\u4e0d\u80fd\u50cf\u5176\u5b83\u8bed\u8a00\u4e00\u6837\u4f7f\u7528goto<\/span>\u51fd\u6570\u8df3\u8f6c\u3002\u800c\u662f\u4f7f\u7528setjmp<\/span>\u548clongjmp<\/span>\u51fd\u6570\u4ee3\u66ff\u8fd9\u7c7b\u8df3\u8f6c\u3002\u4e4b\u540e\u5c31\u4f1a\u770b\u5230\u5728\u6df1\u5c42\u5d4c\u5957\u4e2d\u8fd9\u4e24\u4e2a\u51fd\u6570\u5904\u7406\u9519\u8bef\u6761\u4ef6\u662f\u975e\u5e38\u6709\u7528\u7684\u3002<\/p>\n

\u7cfb\u7edf\u4e0d\u662f\u5fc5\u987b\u62e5\u6709\u5185\u5efa\u786c\u4ef6\u652f\u6301\u7684\u6808\uff0cC\u8bed\u8a00\u53ef\u4ee5\u4f7f\u7528\u94fe\u8868\u6765\u5b9e\u73b0\u73b0\u6808\u5e27\u7684\u529f\u80fd\u3002<\/p>\n\n\n\n
\n\n\n\n\n\n
\n
  #include <setjmp.h>\r\n\r\n  int setjmp(jmp_buf env<\/span>);\r\n<\/pre>\n<\/td>\n<\/tr>\n
\n

Returns: 0 if called directly, nonzero if returning from a call to longjmp<\/tt><\/p>\n<\/td>\n<\/tr>\n

\n
  void longjmp(jmp_buf env<\/span>, int val<\/span>);<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\u5728\u60f3\u8fd4\u56de\u7684\u4f4d\u7f6e\u8c03\u7528setjmp<\/span>\u3002setjmp<\/span>\u7684\u53c2\u6570env<\/em>\u662f\u4e00\u79cd\u7279\u6b8a\u7684\u7c7b\u578bjmp_buf<\/span>\u3002\u8fd9\u79cd\u7c7b\u578b\u662f\u5f53\u8c03\u7528longjmp<\/span>\u65f6\uff0c\u5b83\u53ef\u4ee5\u6062\u590d\u6240\u6709\u8c03\u7528setjmp<\/span>\u65f6\u7684\u6808\u72b6\u6001\u3002\u4e00\u822c\u6765\u8bf4env<\/em>\u53d8\u91cf\u662f\u4e00\u4e2a\u5168\u5c40\u53d8\u91cf\uff0c\u56e0\u4e3a\u6211\u4eec\u9700\u8981\u5728\u53e6\u7684\u51fd\u6570\u4e2d\u5f15\u7528\u5b83\u3002<\/p>\n
longjmp<\/span>\u6709\u4e24\u4e2a\u53c2\u6570\uff0c\u7b2c\u4e00\u4e2aenv<\/em>\u53c2\u6570\u548csetjmp<\/span>\u7528\u7684\u662f\u540c\u4e00\u4e2a\u3002\u7b2c\u4e8c\u4e2aval<\/em>\u662f\u4e00\u4e2a\u975e\u96f6\u503c\uff0c\u5b83\u4f1a\u53d8\u6210setjmp<\/span>\u7684\u8fd4\u56de\u503c\u3002\u7b2c\u4e8c\u4e2a\u53c2\u6570\u7684\u4f5c\u7528\u662f\u7528\u6765\u533a\u5206setjmp<\/span>\u8c03\u7528\u4e86\u54ea\u4e2alongjmp<\/span>\u3002<\/p>\n
\u81ea\u52a8\u53d8\u91cf\u3001\u5bc4\u5b58\u5668\u53d8\u91cf\u548cvolatile\u53d8\u91cf<\/strong><\/h1>\n
\u5f53main<\/span>\u51fd\u6570\u4ecelongjmp<\/span>\u51fd\u6570\u8fd4\u56de\u65f6\uff0c\u5176\u4e2d\u7684\u81ea\u52a8\u53d8\u91cf\u548c\u5bc4\u5b58\u5668\u53d8\u91cf\u7684\u503c\u662f\u672a\u77e5\u7684\uff0c\u6709\u53ef\u80fd\u56de\u6eda\uff0c\u4e5f\u6709\u53ef\u80fd\u6e05\u9664\u3002\u5982\u679c\u6709\u4e00\u4e2a\u53d8\u91cf\u7684\u503c\u4e0d\u60f3\u56de\u6eda\uff0c\u4f7f\u7528volatile<\/span>\u5c5e\u6027\u5b9a\u4e49\u5b83\u3002\u5168\u5c40\u53d8\u91cf\u548c\u9759\u6001\u53d8\u91cf\u5728\u8c03\u7528longjmp<\/span>\u540e\u4f1a\u4fdd\u6301\u4e0d\u53d8\uff08left alone\uff09\u3002<\/p>\n
\u67d0\u4e9b\u7cfb\u7edf\u7684\u624b\u518c\u8bf4\u660e\uff0c\u5728\u5185\u5b58\u4e2d\u7684\u53d8\u91cf\u7684\u503c\uff0c\u662f\u5f53\u8c03\u7528longjmp<\/span>\u65f6\u7684\u503c\u3002\u800c\u5728CPU\u548c\u6d6e\u70b9\u5bc4\u5b58\u5668\u4e2d\u7684\u53d8\u91cf\u5219\u6062\u590d\u4e3a\u8c03\u7528setjmp<\/span>\u65f6\u7684\u503c\u3002<\/p>\n
\u81ea\u52a8\u53d8\u91cf\u7684\u6f5c\u5728\u95ee\u9898<\/h2>\n
\u81ea\u52a8\u53d8\u91cf\u6700\u57fa\u672c\u7684\u4e00\u4e2a\u89c4\u5219\u662f\uff1a\u4e0d\u80fd\u5728\u51fd\u6570\u5df2\u7ecf\u8fd4\u56de\u540e\uff0c\u518d\u53bb\u5f15\u7528\u8be5\u51fd\u6570\u4e2d\u7684\u53d8\u91cf\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5728C\u8bed\u8a00\u4e2d\uff0c\u4e0d\u80fd\u50cf\u5176\u5b83\u8bed\u8a00\u4e00\u6837\u4f7f\u7528goto\u51fd\u6570\u8df3\u8f6c\u3002\u800c\u662f\u4f7f\u7528setjmp\u548clongjmp\u51fd\u6570\u4ee3\u66ff\u8fd9\u7c7b\u8df3\u8f6c\u3002\u4e4b\u540e\u5c31\u4f1a\u770b\u5230\u5728\u6df1\u5c42\u5d4c\u5957\u4e2d\u8fd9\u4e24\u4e2a\u51fd\u6570\u5904\u7406\u9519\u8bef\u6761\u4ef6\u662f\u975e\u5e38\u6709…<\/p>\n
 Read More  Read More<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[],"class_list":["post-341","post","type-post","status-publish","format-standard","hentry","category-apue"],"_links":{"self":[{"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/posts\/341","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=341"}],"version-history":[{"count":6,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/posts\/341\/revisions"}],"predecessor-version":[{"id":348,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/posts\/341\/revisions\/348"}],"wp:attachment":[{"href":"https:\/\/www.5x44.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=341"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=341"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=341"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}