{"id":45959,"date":"2022-03-15T21:45:23","date_gmt":"2022-03-15T12:45:23","guid":{"rendered":"https:\/\/www.charlezz.com\/?p=45959"},"modified":"2022-03-17T16:13:44","modified_gmt":"2022-03-17T07:13:44","slug":"%ec%bd%94%ed%8b%80%eb%a6%b0-%ec%9e%90%eb%b0%94%ec%9d%98-volatile%ec%97%90-%eb%8c%80%ed%95%b4%ec%84%9c","status":"publish","type":"post","link":"https:\/\/charlezz.com\/?p=45959","title":{"rendered":"\ucf54\ud2c0\ub9b0\/\uc790\ubc14\uc758 volatile\uc5d0 \ub300\ud574\uc11c"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">volatile\uc774\ub780?<\/h2>\n\n\n\n<p>\uc790\ubc14\uc758 <strong>volatile<\/strong> \ud0a4\uc6cc\ub4dc \ub610\ub294 \ucf54\ud2c0\ub9b0\uc758 <strong>@Volatile<\/strong> \uc560\ub178\ud14c\uc774\uc158\uc744 \ubcc0\uc218 \uc120\uc5b8\uc2dc \uc9c0\uc815\ud560 \uc218 \uc788\ub2e4. \uc0ac\uc804\uc801 \uc758\ubbf8\ub85c\ub294 &#8216;\ud718\ubc1c\uc131\uc758&#8217;\ub77c\ub294 \ub73b\uc744 \uac00\uc9c0\uba70, \ubcc0\uc218 \uc120\uc5b8\uc2dc volatile\uc744 \uc9c0\uc815\ud558\uba74 \uac12\uc744 <strong>\uba54\uc778 \uba54\ubaa8\ub9ac\uc5d0\ub9cc \uc801\uc7ac<\/strong>\ud558\uac8c \ub41c\ub2e4.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" loading=\"lazy\" width=\"507\" height=\"430\" src=\"https:\/\/www.charlezz.com\/wordpress\/wp-content\/uploads\/2022\/03\/www.charlezz.com-volatile-1.png\" alt=\"\" class=\"wp-image-45960\" srcset=\"https:\/\/charlezz.com\/wordpress\/wp-content\/uploads\/2022\/03\/www.charlezz.com-volatile-1.png 507w, https:\/\/charlezz.com\/wordpress\/wp-content\/uploads\/2022\/03\/www.charlezz.com-volatile-1-300x254.png 300w\" sizes=\"(max-width: 507px) 100vw, 507px\" \/><\/figure>\n\n\n\n<p>volatile \ubcc0\uc218\ub97c \uc0ac\uc6a9\ud558\uc9c0 \uc54a\ub294 \uc77c\ubc18\uc801\uc778 \uacbd\uc6b0\ub294 \ub0b4\ubd80\uc801\uc73c\ub85c \uc131\ub2a5 \ud5a5\uc0c1\uc744 \uc704\ud574 \uba54\uc778 \uba54\ubaa8\ub9ac\ub85c\ubd80\ud130 \uc77d\uc5b4\uc628 \uac12\uc744 CPU \uce90\uc2dc\uc5d0 \uc800\uc7a5\ud55c\ub2e4. \ud558\uc9c0\ub9cc \uba40\ud2f0\uc4f0\ub808\ub4dc \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc5d0\uc11c\ub294 \uac01 \uc4f0\ub808\ub4dc\ub97c \ud1b5\ud574 CPU\uc5d0 \uce90\uc2f1\ud55c <strong>\uac12\uc774 \uc0c1\uc774\ud560 \uc218 \uc788\ub2e4<\/strong> (CPU \uce90\uc2dc1 \uac12 \u2260 CPU \uce90\uc2dc2 \uac12). \uc608\uc81c\ucf54\ub4dc\ub97c \uc0b4\ud3b4\ubcf4\uc790<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\uba54\uc778 \uba54\ubaa8\ub9ac\uc640 CPU\uce90\uc2dc\uc758 \uac12\uc774 \ub2e4\ub978 \uacbd\uc6b0<\/h2>\n\n\n\n<p>\ub2e4\uc74c\uacfc \uac19\uc740 Thread\ub97c \ud655\uc7a5\ud55c \uc11c\ube0c \ud074\ub798\uc2a4\uac00 \uc788\ub2e4\uace0 \uac00\uc815\ud558\uc790.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class Worker : Thread() {\n    var stop = false\n    override fun run() {\n        super.run()\n        while(!stop){ }\n    }\n}<\/code><\/pre>\n\n\n\n<p>\uc774 Worker \ud074\ub798\uc2a4\ub294 \ub2e8\uc21c\ud788 \ubb34\ud55c\ub8e8\ud504\uc5d0 \ube60\uc9c0\ub294 \uc4f0\ub808\ub4dc\ub2e4. \ud558\uc9c0\ub9cc stop\uc774 true\uac00 \ub418\ub294 \uc21c\uac04 \ub8e8\ud504\uc5d0\uc11c \ube60\uc838\ub098\uc640 \uc791\uc5c5\uc744 \ub9c8\uce60 \uc218 \uc788\uac8c\ub418\uace0, \uc4f0\ub808\ub4dc\ub294 \uc885\ub8cc\ub41c\ub2e4.<\/p>\n\n\n\n<p>\uc774\uc81c Worker \ud074\ub798\uc2a4\ub97c \uc0ac\uc6a9\ud55c \ub2e4\uc74c \uc608\uc81c\ucf54\ub4dc\ub97c \uc0b4\ud3b4\ubcf4\uc790.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>@Test\nfun `Worker \uc4f0\ub808\ub4dc \ud14c\uc2a4\ud2b8`(){\n    repeat(3){\n        val worker = Worker() \/\/ worker \uc4f0\ub808\ub4dc \uc0dd\uc131\n        worker.start() \/\/ worker \uc4f0\ub808\ub4dc \uc2dc\uc791\n        Thread.sleep(100) \/\/ \uba54\uc778 \uc4f0\ub808\ub4dc \uc7a0\uc2dc \uc218\uba74\n        println(\"stop\uc744 true\ub85c \ubcc0\uacbd\")\n        worker.stop = true \/\/ worker\uc4f0\ub808\ub4dc\uc758 stop \ud50c\ub798\uadf8 \ubcc0\uacbd\n        worker.join() \/\/ worker \uc4f0\ub808\ub4dc\uac00 \ub05d\ub0a0 \ub54c\uae4c\uc9c0 \uba54\uc778\uc4f0\ub808\ub4dc\uc5d0\uc11c \ub300\uae30\n    }\n    println(\"\uc791\uc5c5 \uc885\ub8cc\")\n}<\/code><\/pre>\n\n\n\n<p>\uc774 \ucf54\ub4dc\ub97c \uc2e4\ud589\ud588\uc744 \ub54c \uc9c1\uad00\uc801\uc73c\ub85c \uc0dd\uac01\ud560 \uc218 \uc788\ub294 \ucd9c\ub825 \uba54\uc2dc\uc9c0\ub294 \uc544\ub9c8 \ub2e4\uc74c\uacfc \uac19\uc744 \uac83\uc774\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>stop\uc744 true\ub85c \ubcc0\uacbd\n<meta charset=\"utf-8\">stop\uc744 true\ub85c \ubcc0\uacbd\n<meta charset=\"utf-8\">stop\uc744 true\ub85c \ubcc0\uacbd\n\uc791\uc5c5 \uc885\ub8cc<\/code><\/pre>\n\n\n\n<p>\ud558\uc9c0\ub9cc \ud604\uc2e4\uc740 \uadf8\ub807\uc9c0 \uc54a\ub2e4. <strong>&#8220;stop\uc744 true\ub85c \ubcc0\uacbd&#8221; \uba54\uc2dc\uc9c0\ub9cc \ub0a8\uae34 \ucc44 \ud504\ub85c\uadf8\ub7a8\uc774 \uba48\ucd94\uac8c \ub41c\ub2e4.<\/strong><\/p>\n\n\n\n<p>\uadf8 \uc774\uc720\ub294 Worker \uc4f0\ub808\ub4dc\uac00 &#8216;stop&#8217;\uc774\ub780 \uac12\uc744 \uacc4\uc18d \ucc38\uc870\ud574\uc57c \ud558\uae30 \ub54c\ubb38\uc5d0 \uc131\ub2a5\uc744 \uc704\ud574 CPU \uce90\uc2dc\uc5d0 \ub2f4\uc544\ub450\uac8c \ub418\ub294\ub370, \uc774\ub54c \uba54\uc778\uc4f0\ub808\ub4dc\uc5d0\uc11c \uc811\uadfc\ud558\ub294 worker.stop\uc758 \uac12\uc740 \uba54\uc778 \uba54\ubaa8\ub9ac\ub85c\ubd80\ud130 \ucc38\uc870\ud558\ub294 \uac12\uc774\ubbc0\ub85c \uc11c\ub85c \ub2e4\ub978 \ub450\uac1c\uc758 \uc601\uc5ed\uc5d0 \uac12\uc774 \uc874\uc7ac\ud55c\ub2e4. \uba54\uc778\uc2a4\ub808\ub4dc\uc5d0\uc11c stop\uc744 true\ub85c \ubc14\uafd4\ub3c4 Worker \uc4f0\ub808\ub4dc\uac00 \ucc38\uc870\ud558\ub294 stop\uc740 CPU \uce90\uc2dc \uc601\uc5ed\uc5d0 \uc800\uc7a5\ub41c \uac12\uc774\ubbc0\ub85c \uc5ec\uc804\ud788 stop\uc740 false\uc774\ub2e4. \uadf8\ub807\uae30 \ub54c\ubb38\uc5d0 Worker \uc4f0\ub808\ub4dc\ub294 \ub8e8\ud504\ub97c \ube60\uc838\ub098\uc624\uc9c0 \ubabb\ud558\uace0 \ud504\ub85c\uadf8\ub7a8\uc740 \uba48\ucd94\uac8c \ub41c\ub2e4.<\/p>\n\n\n\n<p>\uc774\uc81c \ucf54\ub4dc\ub97c \uc57d\uac04 \uc218\uc815\ud574\ubcf4\uc790. \uc218\uc815\uc740 \ub9e4\uc6b0 \uac04\ub2e8\ud558\ub2e4. @Volatile \ub9cc \ubd99\uc774\uba74 \ub41c\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class Worker : Thread() {\n    <strong>@Volatile<\/strong>\n    var stop = false\n    override fun run() {\n        super.run()\n        while(!stop){ }\n    }\n}<\/code><\/pre>\n\n\n\n<p>\uc774\uc81c \uc544\uae4c \ud14c\uc2a4\ud2b8 \ucf54\ub4dc\ub97c \ub2e4\uc2dc \uc218\ud589\ud558\uba74 \uae30\ub300\ud55c \uacb0\uacfc\ub97c \uc5bb\uc744 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\uacb0\ub860<\/h2>\n\n\n\n<p>@Volatile\uc744 \ubd99\uc774\uba74 \ubcc0\uc218\uc758 \uac12\uc774 \uba54\uc778 \uba54\ubaa8\ub9ac\uc5d0\ub9cc \uc800\uc7a5\ub418\uba70, \uba40\ud2f0 \uc4f0\ub808\ub4dc \ud658\uacbd\uc5d0\uc11c \uba54\uc778 \uba54\ubaa8\ub9ac\uc758 \uac12\uc744 \ucc38\uc870\ud558\ubbc0\ub85c \ubcc0\uc218 \uac12 \ubd88\uc77c\uce58 \ubb38\uc81c\ub97c \ud574\uacb0\ud560 \uc218 \uc788\uac8c\ub41c\ub2e4. \ub2e4\ub9cc CPU\uce90\uc2dc\ub97c \ucc38\uc870\ud558\ub294 \uac83\ubcf4\ub2e4 \uba54\uc778\uba54\ubaa8\ub9ac\ub97c \ucc38\uc870\ud558\ub294 \uac83\uc774 \ub354 \ub290\ub9ac\ubbc0\ub85c, \uc131\ub2a5\uc740 \ub5a8\uc5b4\uc9c8 \uc218 \ubc16\uc5d0 \uc5c6\ub2e4. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\ucc38\uc870 \ub9c1\ud06c <\/h2>\n\n\n\n<p><a href=\"http:\/\/tutorials.jenkov.com\/java-concurrency\/volatile.html\">http:\/\/tutorials.jenkov.com\/java-concurrency\/volatile.html<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/codingdog.tistory.com\/entry\/java-volatile-%EB%B3%80%EC%88%98%EC%9D%98-%EA%B0%80%EC%8B%9C%EC%84%B1%EA%B3%BC-%EC%B5%9C%EC%A0%81%ED%99%94\">https:\/\/codingdog.tistory.com\/entry\/java-volatile-%EB%B3%80%EC%88%98%EC%9D%98-%EA%B0%80%EC%8B%9C%EC%84%B1%EA%B3%BC-%EC%B5%9C%EC%A0%81%ED%99%94<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>volatile\uc774\ub780? \uc790\ubc14\uc758 volatile \ud0a4\uc6cc\ub4dc \ub610\ub294 \ucf54\ud2c0\ub9b0\uc758 @Volatile \uc560\ub178\ud14c\uc774\uc158\uc744 \ubcc0\uc218 \uc120\uc5b8\uc2dc \uc9c0\uc815\ud560 \uc218 \uc788\ub2e4. \uc0ac\uc804\uc801 \uc758\ubbf8\ub85c\ub294 &#8216;\ud718\ubc1c\uc131\uc758&#8217;\ub77c\ub294 \ub73b\uc744 \uac00\uc9c0\uba70, \ubcc0\uc218 \uc120\uc5b8\uc2dc volatile\uc744 \uc9c0\uc815\ud558\uba74 \uac12\uc744 \uba54\uc778 \uba54\ubaa8\ub9ac\uc5d0\ub9cc \uc801\uc7ac\ud558\uac8c \ub41c\ub2e4. volatile \ubcc0\uc218\ub97c \uc0ac\uc6a9\ud558\uc9c0 \uc54a\ub294 \uc77c\ubc18\uc801\uc778 \uacbd\uc6b0\ub294 \ub0b4\ubd80\uc801\uc73c\ub85c \uc131\ub2a5 \ud5a5\uc0c1\uc744 \uc704\ud574 \uba54\uc778 \uba54\ubaa8\ub9ac\ub85c\ubd80\ud130 \uc77d\uc5b4\uc628 \uac12\uc744 CPU \uce90\uc2dc\uc5d0 \uc800\uc7a5\ud55c\ub2e4. \ud558\uc9c0\ub9cc \uba40\ud2f0\uc4f0\ub808\ub4dc \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc5d0\uc11c\ub294 \uac01 \uc4f0\ub808\ub4dc\ub97c \ud1b5\ud574 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"inline_featured_image":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0},"categories":[5],"tags":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/charlezz.com\/index.php?rest_route=\/wp\/v2\/posts\/45959"}],"collection":[{"href":"https:\/\/charlezz.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/charlezz.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/charlezz.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/charlezz.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=45959"}],"version-history":[{"count":2,"href":"https:\/\/charlezz.com\/index.php?rest_route=\/wp\/v2\/posts\/45959\/revisions"}],"predecessor-version":[{"id":45966,"href":"https:\/\/charlezz.com\/index.php?rest_route=\/wp\/v2\/posts\/45959\/revisions\/45966"}],"wp:attachment":[{"href":"https:\/\/charlezz.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=45959"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/charlezz.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=45959"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/charlezz.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=45959"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}