{"id":1175,"date":"2026-10-23T17:00:00","date_gmt":"2026-10-23T08:00:00","guid":{"rendered":"https:\/\/quantumsea.net\/?p=1175"},"modified":"2026-10-22T17:54:57","modified_gmt":"2026-10-22T08:54:57","slug":"qs-timerfd-expiration-count-20261022","status":"publish","type":"post","link":"https:\/\/quantumsea.net\/?p=1175","title":{"rendered":"Linux\u306etimerfd\u3001\u671f\u9650\u304c\u6765\u305f\u56de\u6570\u3068\u51e6\u7406\u3057\u305f\u56de\u6570\u306f\u9055\u3046"},"content":{"rendered":"<p>1\u79d2\u3054\u3068\u306b\u5b9f\u884c\u3057\u305f\u3044\u51e6\u7406\u304c\u3042\u308b\u306e\u306b\u3001\u5225\u306e\u4ed5\u4e8b\u30673\u79d2\u4ee5\u4e0a\u624b\u304c\u96e2\u305b\u306a\u304b\u3063\u305f\u3002\u6b21\u306b\u30bf\u30a4\u30de\u30fc\u3092\u78ba\u8a8d\u3057\u305f\u3068\u304d\u3001\u4f55\u56de\u5206\u306e\u671f\u9650\u304c\u904e\u304e\u3066\u3044\u305f\u304b\u3092\u77e5\u308a\u305f\u3044\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002Linux\u306etimerfd\u306f\u3001\u30bf\u30a4\u30de\u30fc\u3092\u30d5\u30a1\u30a4\u30eb\u30c7\u30a3\u30b9\u30af\u30ea\u30d7\u30bf\u30fc\u3068\u3057\u3066\u5f85\u3061\u5408\u308f\u305b\u3001\u8aad\u307f\u53d6\u308a\u3067\u671f\u9650\u5230\u6765\u306e\u56de\u6570\u3092\u53d7\u3051\u53d6\u308b\u4ed5\u7d44\u307f\u3067\u3059\u3002\u305f\u3060\u3057\u3001\u305d\u306e\u56de\u6570\u306f\u4ed5\u4e8b\u304c\u5b9f\u884c\u3055\u308c\u305f\u56de\u6570\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<section class=\"influvetor-quick-summary\" aria-label=\"\u7c21\u5358\u306b\u307e\u3068\u3081\u308b\u3068\uff1f\">\n<p><strong>\u7c21\u5358\u306b\u307e\u3068\u3081\u308b\u3068\uff1f<\/strong><\/p>\n<ul>\n<li>\u5468\u671f\u30bf\u30a4\u30de\u30fc\u306etimerfd\u3092\u8aad\u3080\u3068\u3001\u524d\u56de\u306e\u6210\u529f\u3057\u305f\u8aad\u307f\u53d6\u308a\u3001\u307e\u305f\u306f\u8a2d\u5b9a\u5909\u66f4\u4ee5\u964d\u306b\u671f\u9650\u304c\u6765\u305f\u56de\u6570\u3092\u53d7\u3051\u53d6\u308a\u307e\u3059\u3002<\/li>\n<li>1\u79d2\u5468\u671f\u30923.4\u79d2\u3067\u521d\u3081\u3066\u8aad\u3093\u3067\u50243\u3092\u5f97\u3066\u3082\u3001\u4ed5\u4e8b\u30923\u56de\u5b9f\u884c\u3057\u305f\u8a3c\u660e\u306b\u306f\u306a\u308a\u307e\u305b\u3093\u3002<\/li>\n<li>\u9045\u308c\u305f\u5206\u3092\u5168\u90e8\u51e6\u7406\u3059\u308b\u304b\u3001\u307e\u3068\u3081\u3066\u6700\u65b0\u72b6\u614b\u3078\u8ffd\u3044\u3064\u304f\u304b\u306f\u3001\u7528\u9014\u306b\u5fdc\u3058\u3066\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u5074\u3067\u6c7a\u3081\u307e\u3059\u3002<\/li>\n<\/ul>\n<\/section>\n<h2>\u30bf\u30a4\u30de\u30fc\u3092\u3001\u307b\u304b\u306e\u5165\u51fa\u529b\u3068\u4e00\u7dd2\u306b\u5f85\u3064<\/h2>\n<p>timerfd_create\u3067\u30bf\u30a4\u30de\u30fc\u3092\u4f5c\u308b\u3068\u3001\u30d5\u30a1\u30a4\u30eb\u30c7\u30a3\u30b9\u30af\u30ea\u30d7\u30bf\u30fc\u304c\u8fd4\u308a\u307e\u3059\u3002\u3053\u308c\u306f\u30bd\u30b1\u30c3\u30c8\u306a\u3069\u3068\u540c\u3058\u304f\u3001poll\u3084epoll\u306e\u5f85\u6a5f\u5bfe\u8c61\u306b\u3067\u304d\u307e\u3059\u3002\u901a\u4fe1\u306e\u5230\u7740\u3068\u30bf\u30a4\u30de\u30fc\u306e\u671f\u9650\u3092\u4e00\u3064\u306e\u30a4\u30d9\u30f3\u30c8\u30eb\u30fc\u30d7\u3067\u6271\u3048\u308b\u305f\u3081\u3001\u6642\u9593\u5f85\u3061\u306e\u305f\u3081\u3060\u3051\u306b\u5225\u306e\u51e6\u7406\u7d4c\u8def\u3092\u7528\u610f\u305b\u305a\u306b\u6e08\u307f\u307e\u3059\u3002<\/p>\n<p>\u671f\u9650\u3092\u6c7a\u3081\u308b\u306e\u306ftimerfd_settime\u3067\u3059\u3002\u6700\u521d\u306b\u3044\u3064\u671f\u9650\u304c\u6765\u308b\u304b\u3092it_value\u306b\u3001\u7e70\u308a\u8fd4\u3057\u306e\u9593\u9694\u3092it_interval\u306b\u6307\u5b9a\u3057\u307e\u3059\u3002\u6700\u521d\u30921\u79d2\u5f8c\u3001\u9593\u9694\u30921\u79d2\u306b\u3059\u308c\u3070\u3001\u305d\u306e\u5f8c\u30821\u79d2\u3054\u3068\u306e\u671f\u9650\u3092\u8a2d\u5b9a\u3067\u304d\u307e\u3059\u3002it_interval\u304c0\u306a\u3089\u4e00\u5ea6\u3060\u3051\u306e\u30bf\u30a4\u30de\u30fc\u3067\u3059\u3002\u4e00\u65b9\u3001it_value\u30920\u306b\u3059\u308b\u3068\u30bf\u30a4\u30de\u30fc\u3092\u505c\u6b62\u3057\u307e\u3059\u3002\u300c0\u79d2\u5f8c\u306b\u3059\u3050\u767a\u706b\u3055\u305b\u308b\u300d\u3068\u3044\u3046\u6307\u5b9a\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u671f\u9650\u304c\u6765\u308c\u3070\u8aad\u307f\u53d6\u308a\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u304c\u3001\u8aad\u307f\u53d6\u308a\u53ef\u80fd\u3067\u3042\u308b\u3053\u3068\u3068\u3001\u305d\u306e\u5834\u3067\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u304cCPU\u3092\u4f7f\u3048\u308b\u3053\u3068\u306f\u5225\u3067\u3059\u3002\u307b\u304b\u306e\u51e6\u7406\u304c\u9577\u5f15\u304f\u5834\u5408\u3084\u3001\u30b9\u30b1\u30b8\u30e5\u30fc\u30e9\u30fc\u304c\u5225\u306e\u4ed5\u4e8b\u3092\u52d5\u304b\u3057\u3066\u3044\u308b\u5834\u5408\u306b\u306f\u3001\u30bf\u30a4\u30de\u30fc\u3092\u8aad\u3080\u6642\u523b\u304c\u9045\u308c\u307e\u3059\u3002timerfd\u306f\u3001\u305d\u306e\u9045\u308c\u3092\u306a\u304f\u3059\u4ed5\u7d44\u307f\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<h2>3.4\u79d2\u3067\u8aad\u3093\u3060\u50243\u306f\u3001\u904e\u304e\u305f\u671f\u9650\u3092\u6570\u3048\u3066\u3044\u308b<\/h2>\n<p>\u8aac\u660e\u306e\u305f\u3081\u3001\u6642\u523b0\u306b\u8a2d\u5b9a\u3057\u3001\u6700\u521d\u306e\u671f\u9650\u304c1\u79d2\u3001\u4ee5\u5f8c\u30821\u79d2\u9593\u9694\u306b\u306a\u308b\u7406\u60f3\u7684\u306a\u30bf\u30a4\u30de\u30fc\u3092\u8003\u3048\u307e\u3059\u3002\u9014\u4e2d\u3067\u8aad\u307f\u53d6\u308a\u3082\u518d\u8a2d\u5b9a\u3082\u3057\u306a\u3051\u308c\u3070\u30013.4\u79d2\u306e\u6642\u70b9\u3067\u306f1\u79d2\u30012\u79d2\u30013\u79d2\u306e\u4e09\u3064\u306e\u671f\u9650\u304c\u904e\u304e\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u3068\u304d\u8aad\u3080\u5024\u306f3\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u8aad\u307f\u53d6\u308a\u304c\u6210\u529f\u3057\u305f\u5f8c\u30014.2\u79d2\u306b\u3082\u3046\u4e00\u5ea6\u8aad\u3081\u3070\u3001\u305d\u306e\u9593\u306b\u65b0\u305f\u306b\u904e\u304e\u305f4\u79d2\u306e\u671f\u9650\u3092\u6570\u3048\u3001\u50241\u3092\u53d7\u3051\u53d6\u308a\u307e\u3059\u3002\u6700\u521d\u304b\u3089\u306e\u5408\u8a084\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u8aad\u307f\u53d6\u308a\u306f\u3001\u524d\u56de\u306e\u6210\u529f\u3057\u305f\u8aad\u307f\u53d6\u308a\u3001\u307e\u305f\u306ftimerfd_settime\u306b\u3088\u308b\u8a2d\u5b9a\u5909\u66f4\u304b\u3089\u306e\u671f\u9650\u5230\u6765\u56de\u6570\u3092\u53d7\u3051\u53d6\u308a\u307e\u3059\u3002<\/p>\n<figure style=\"margin:1.5em 0\"><img decoding=\"async\" src=\"https:\/\/quantumsea.net\/wp-content\/uploads\/2026\/10\/qs-timerfd-expiration-count-20261022-figure-753aa0966528.png\" alt=\"\u671f\u9650\u306f1\u30012\u30013\u30014\u79d2\u3002\u6700\u521d\u306e\u8aad\u307f\u53d6\u308a\u304c3.4\u79d2\u306a\u3089\u50243\u3001\u6b21\u304c4.2\u79d2\u306a\u3089\u50241\u3002\u8aad\u307f\u53d6\u3063\u305f\u5024\u306f\u671f\u9650\u5230\u6765\u56de\u6570\u3067\u3001\u4ed5\u4e8b\u306e\u5b9f\u884c\u56de\u6570\u3067\u306f\u306a\u3044\u3002\" 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href=\"https:\/\/man7.org\/linux\/man-pages\/man2\/timerfd_create.2.html\">Linux man-pages 6.19: timerfd_create(2)<\/a> \u2014 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