{"id":2242,"date":"2021-01-17T13:20:40","date_gmt":"2021-01-17T05:20:40","guid":{"rendered":"http:\/\/myblog.emhct.net.cn\/?p=2242"},"modified":"2021-01-17T13:20:42","modified_gmt":"2021-01-17T05:20:42","slug":"linux%e4%bf%a1%e5%8f%b7%e9%87%8f%e9%82%a3%e7%82%b9%e5%9d%91","status":"publish","type":"post","link":"http:\/\/myblog.emhct.net.cn\/index.php\/archives\/2242","title":{"rendered":"linux\u4fe1\u53f7\u91cf\u90a3\u70b9\u5751"},"content":{"rendered":"\n<p>\u5728\u7528\u6237\u89d2\u5ea6\u6765\u770b\uff0clinux\u6709\u4e24\u79cd\u4fe1\u53f7\u91cf\uff0csystem v\u548cposix\u4e24\u79cd\u3002<\/p>\n\n\n\n<p>\u4e4b\u524d\u7531\u4e8e\u9700\u8981\u5feb\u901f\u5f00\u53d1\u51fa\u4e1c\u897f\u6765\uff0c\u5c31\u968f\u4fbf\u9009\u4e86\u4e00\u4e2a\u4fe1\u53f7\u91cf\u6765\u4f7f\u7528\uff0c\u540e\u6765\u624d\u53d1\u73b0\u662fsystem v\uff0c\u5728\u4f7f\u7528\u8fc7\u7a0b\u4e2d\u4e5f\u9047\u5230\u4e86\u4e00\u4e9b\u5751\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sem_key_ = ftok(\u201cfile_exist\u201d, 'a');\n\nint flag = 0666;\nflag |= IPC_CREAT;\n\nsem_id_ = semget(sem_key_, 1, flag);\nif (-1 == sem_id_) {\n  std::cout &lt;&lt; \"semaphore create failed\" &lt;&lt; std::endl;\n  return;\n}\n\nunion semun sem_union;\nsem_union.val = 1;\nif (semctl(sem_id_, 0, SETVAL, sem_union) == -1) {\n    std::cout &lt;&lt; \"semaphore semctl failed\" &lt;&lt; std::endl;\n    return;\n}<\/code><\/pre>\n\n\n\n<p>\u8fd9\u91cc\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0cftok\u7684\u7b2c\u4e00\u4e2a\u4f20\u5165\u51fd\u6570\u5fc5\u987b\u8981\u67d0\u4e2a\u5b58\u5728\u7684\u6587\u4ef6\uff0c\u56e0\u4e3a\u9700\u8981\u901a\u8fc7\u5177\u4f53\u7684\u6587\u4ef6\uff0c\u53bb\u8bbf\u95ee\u5bf9\u5e94\u7684nodeid\uff0c\u5e76\u505ahash\u503c\u3002\u5982\u679c\u6587\u4ef6\u4e0d\u5b58\u5728\uff0c\u90a3\u4e48\u8fd4\u56de\u503c\u5c06\u4f1a\u662f-1\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728\u7528\u6237\u89d2\u5ea6\u6765\u770b\uff0clinux\u6709\u4e24\u79cd\u4fe1\u53f7\u91cf\uff0csystem v\u548cposix\u4e24\u79cd\u3002 \u4e4b\u524d\u7531\u4e8e\u9700\u8981\u5feb\u901f\u5f00\u53d1\u51fa\u4e1c\u897f\u6765\uff0c\u5c31\u968f\u4fbf\u9009\u4e86\u4e00\u4e2a\u4fe1\u53f7\u91cf\u6765\u4f7f\u7528\uff0c\u540e\u6765\u624d\u53d1\u73b0\u662fsystem v\uff0c\u5728\u4f7f\u7528\u8fc7\u7a0b\u4e2d\u4e5f\u9047\u5230\u4e86\u4e00\u4e9b\u5751\u3002 \u8fd9\u91cc\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0cftok\u7684\u7b2c\u4e00\u4e2a\u4f20\u5165\u51fd\u6570\u5fc5\u987b\u8981\u67d0\u4e2a\u5b58\u5728\u7684\u6587\u4ef6\uff0c\u56e0\u4e3a\u9700\u8981\u901a\u8fc7\u5177\u4f53\u7684\u6587\u4ef6\uff0c\u53bb\u8bbf\u95ee\u5bf9\u5e94\u7684nodeid\uff0c\u5e76\u505ahash &hellip;<\/p>\n<p class=\"read-more\"><a href=\"http:\/\/myblog.emhct.net.cn\/index.php\/archives\/2242\">read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12,15],"tags":[],"class_list":["post-2242","post","type-post","status-publish","format-standard","hentry","category-linuxMark","category-unixProgram"],"_links":{"self":[{"href":"http:\/\/myblog.emhct.net.cn\/index.php\/wp-json\/wp\/v2\/posts\/2242","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/myblog.emhct.net.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/myblog.emhct.net.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/myblog.emhct.net.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/myblog.emhct.net.cn\/index.php\/wp-json\/wp\/v2\/comments?post=2242"}],"version-history":[{"count":1,"href":"http:\/\/myblog.emhct.net.cn\/index.php\/wp-json\/wp\/v2\/posts\/2242\/revisions"}],"predecessor-version":[{"id":2243,"href":"http:\/\/myblog.emhct.net.cn\/index.php\/wp-json\/wp\/v2\/posts\/2242\/revisions\/2243"}],"wp:attachment":[{"href":"http:\/\/myblog.emhct.net.cn\/index.php\/wp-json\/wp\/v2\/media?parent=2242"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/myblog.emhct.net.cn\/index.php\/wp-json\/wp\/v2\/categories?post=2242"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/myblog.emhct.net.cn\/index.php\/wp-json\/wp\/v2\/tags?post=2242"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}