{"id":12211,"date":"2022-09-30T01:39:24","date_gmt":"2022-09-29T20:09:24","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-deadlock-occuring-in-the-dining-philosophers-code\/"},"modified":"2022-09-30T01:39:24","modified_gmt":"2022-09-29T20:09:24","slug":"solved-deadlock-occuring-in-the-dining-philosophers-code","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-deadlock-occuring-in-the-dining-philosophers-code\/","title":{"rendered":"[Solved] Deadlock occuring in the Dining Philosophers code"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-23661366\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"23661366\" data-parentid=\"23660038\" data-score=\"2\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>The solution is relatively simple:<\/p>\n<blockquote>\n<ol>\n<li>Philosopher attempts to get fork on left<br \/>\n  SUCCEED -&gt; Continue to step 2<br \/>\n  FAIL -&gt; wait (for a while)<\/li>\n<li>Philosopher attempts to get fork on right<br \/>\n  SUCCEED -&gt; Continue to step 3<br \/>\n  FAIL -&gt; Release left fork and wait (for a while)<\/li>\n<li>Eat and release both forks.  Then wait (for a while)<\/li>\n<\/ol>\n<\/blockquote>\n<p>The point to emphasize here is that anytime a philosopher fails to get <em>both<\/em> forks, he needs to drop any forks he is holding and wait a bit or deadlock will eventually occur.<\/p>\n<p>Perhaps more importantly, what kind of moron uses two forks to eat?<\/p>\n<p>&#8212; EDIT &#8212;<\/p>\n<p>Here is a quick example for the Fork<\/p>\n<pre><code>class Fork {\n    public static final char FORK = '|';\n    public static final char NO_FORK = ' ';\n    private int id;\n    private Lock lock = new ReentrantLock();\n\n    public Fork(final int id) {\n        this.id = id;\n    }\n\n    public boolean isHeld() {\n        return lock.isLocked();\n    }\n\n    \/\/ returns true if successfully grabbed!\n    public synchronized boolean tryToGrab() {\n        return lock.tryLock();\n    }\n\n    public void letGo() {\n        lock.unlock();\n    }\n}\n<\/code><\/pre>\n<p>Your idea of using a Semaphore object would work just as well.  Good luck!<\/p>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">13<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Deadlock occuring in the Dining Philosophers code <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] The solution is relatively simple: Philosopher attempts to get fork on left SUCCEED -&gt; Continue to step 2 FAIL -&gt; wait (for a while) Philosopher attempts to get fork on right SUCCEED -&gt; Continue to step 3 FAIL -&gt; Release left fork and wait (for a while) Eat and release both forks. Then wait &#8230; <a title=\"[Solved] Deadlock occuring in the Dining Philosophers code\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-deadlock-occuring-in-the-dining-philosophers-code\/\" aria-label=\"More on [Solved] Deadlock occuring in the Dining Philosophers code\">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":[320],"tags":[3327,323,884],"class_list":["post-12211","post","type-post","status-publish","format-standard","hentry","category-solved","tag-deadlock","tag-java","tag-multithreading"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Deadlock occuring in the Dining Philosophers code - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-deadlock-occuring-in-the-dining-philosophers-code\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Deadlock occuring in the Dining Philosophers code - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] The solution is relatively simple: Philosopher attempts to get fork on left SUCCEED -&gt; Continue to step 2 FAIL -&gt; wait (for a while) Philosopher attempts to get fork on right SUCCEED -&gt; Continue to step 3 FAIL -&gt; Release left fork and wait (for a while) Eat and release both forks. Then wait ... Read more\" \/>\n<meta property=\"og:url\" content=\"https:\/\/jassweb.com\/solved\/solved-deadlock-occuring-in-the-dining-philosophers-code\/\" \/>\n<meta property=\"og:site_name\" content=\"JassWeb\" \/>\n<meta property=\"article:published_time\" content=\"2022-09-29T20:09:24+00:00\" \/>\n<meta name=\"author\" content=\"Kirat\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Kirat\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/jassweb.com\/solved\/solved-deadlock-occuring-in-the-dining-philosophers-code\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/jassweb.com\/solved\/solved-deadlock-occuring-in-the-dining-philosophers-code\/\"},\"author\":{\"name\":\"Kirat\",\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/person\/65c9c7b7958150c0dc8371fa35dd7c31\"},\"headline\":\"[Solved] Deadlock occuring in the Dining Philosophers code\",\"datePublished\":\"2022-09-29T20:09:24+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/jassweb.com\/solved\/solved-deadlock-occuring-in-the-dining-philosophers-code\/\"},\"wordCount\":147,\"publisher\":{\"@id\":\"https:\/\/jassweb.com\/solved\/#organization\"},\"keywords\":[\"deadlock\",\"java\",\"multithreading\"],\"articleSection\":[\"Solved\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/jassweb.com\/solved\/solved-deadlock-occuring-in-the-dining-philosophers-code\/\",\"url\":\"https:\/\/jassweb.com\/solved\/solved-deadlock-occuring-in-the-dining-philosophers-code\/\",\"name\":\"[Solved] Deadlock occuring in the Dining Philosophers code - JassWeb\",\"isPartOf\":{\"@id\":\"https:\/\/jassweb.com\/solved\/#website\"},\"datePublished\":\"2022-09-29T20:09:24+00:00\",\"breadcrumb\":{\"@id\":\"https:\/\/jassweb.com\/solved\/solved-deadlock-occuring-in-the-dining-philosophers-code\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/jassweb.com\/solved\/solved-deadlock-occuring-in-the-dining-philosophers-code\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/jassweb.com\/solved\/solved-deadlock-occuring-in-the-dining-philosophers-code\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/jassweb.com\/solved\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"[Solved] Deadlock occuring in the Dining Philosophers code\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/jassweb.com\/solved\/#website\",\"url\":\"https:\/\/jassweb.com\/solved\/\",\"name\":\"JassWeb\",\"description\":\"Build High-quality Websites\",\"publisher\":{\"@id\":\"https:\/\/jassweb.com\/solved\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/jassweb.com\/solved\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/jassweb.com\/solved\/#organization\",\"name\":\"Jass Web\",\"url\":\"https:\/\/jassweb.com\/solved\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/jassweb.com\/wp-content\/uploads\/2021\/02\/jass-website-logo-1.png\",\"contentUrl\":\"https:\/\/jassweb.com\/wp-content\/uploads\/2021\/02\/jass-website-logo-1.png\",\"width\":693,\"height\":132,\"caption\":\"Jass Web\"},\"image\":{\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/logo\/image\/\"}},{\"@type\":\"Person\",\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/person\/65c9c7b7958150c0dc8371fa35dd7c31\",\"name\":\"Kirat\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/jassweb.com\/solved\/wp-content\/litespeed\/avatar\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1775193939\",\"contentUrl\":\"https:\/\/jassweb.com\/solved\/wp-content\/litespeed\/avatar\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1775193939\",\"caption\":\"Kirat\"},\"sameAs\":[\"http:\/\/jassweb.com\"],\"url\":\"https:\/\/jassweb.com\/solved\/author\/jaspritsinghghumangmail-com\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"[Solved] Deadlock occuring in the Dining Philosophers code - JassWeb","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/jassweb.com\/solved\/solved-deadlock-occuring-in-the-dining-philosophers-code\/","og_locale":"en_US","og_type":"article","og_title":"[Solved] Deadlock occuring in the Dining Philosophers code - JassWeb","og_description":"[ad_1] The solution is relatively simple: Philosopher attempts to get fork on left SUCCEED -&gt; Continue to step 2 FAIL -&gt; wait (for a while) Philosopher attempts to get fork on right SUCCEED -&gt; Continue to step 3 FAIL -&gt; Release left fork and wait (for a while) Eat and release both forks. Then wait ... Read more","og_url":"https:\/\/jassweb.com\/solved\/solved-deadlock-occuring-in-the-dining-philosophers-code\/","og_site_name":"JassWeb","article_published_time":"2022-09-29T20:09:24+00:00","author":"Kirat","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Kirat","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/jassweb.com\/solved\/solved-deadlock-occuring-in-the-dining-philosophers-code\/#article","isPartOf":{"@id":"https:\/\/jassweb.com\/solved\/solved-deadlock-occuring-in-the-dining-philosophers-code\/"},"author":{"name":"Kirat","@id":"https:\/\/jassweb.com\/solved\/#\/schema\/person\/65c9c7b7958150c0dc8371fa35dd7c31"},"headline":"[Solved] Deadlock occuring in the Dining Philosophers code","datePublished":"2022-09-29T20:09:24+00:00","mainEntityOfPage":{"@id":"https:\/\/jassweb.com\/solved\/solved-deadlock-occuring-in-the-dining-philosophers-code\/"},"wordCount":147,"publisher":{"@id":"https:\/\/jassweb.com\/solved\/#organization"},"keywords":["deadlock","java","multithreading"],"articleSection":["Solved"],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/jassweb.com\/solved\/solved-deadlock-occuring-in-the-dining-philosophers-code\/","url":"https:\/\/jassweb.com\/solved\/solved-deadlock-occuring-in-the-dining-philosophers-code\/","name":"[Solved] Deadlock occuring in the Dining Philosophers code - JassWeb","isPartOf":{"@id":"https:\/\/jassweb.com\/solved\/#website"},"datePublished":"2022-09-29T20:09:24+00:00","breadcrumb":{"@id":"https:\/\/jassweb.com\/solved\/solved-deadlock-occuring-in-the-dining-philosophers-code\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/jassweb.com\/solved\/solved-deadlock-occuring-in-the-dining-philosophers-code\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/jassweb.com\/solved\/solved-deadlock-occuring-in-the-dining-philosophers-code\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/jassweb.com\/solved\/"},{"@type":"ListItem","position":2,"name":"[Solved] Deadlock occuring in the Dining Philosophers code"}]},{"@type":"WebSite","@id":"https:\/\/jassweb.com\/solved\/#website","url":"https:\/\/jassweb.com\/solved\/","name":"JassWeb","description":"Build High-quality Websites","publisher":{"@id":"https:\/\/jassweb.com\/solved\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/jassweb.com\/solved\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/jassweb.com\/solved\/#organization","name":"Jass Web","url":"https:\/\/jassweb.com\/solved\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/jassweb.com\/solved\/#\/schema\/logo\/image\/","url":"https:\/\/jassweb.com\/wp-content\/uploads\/2021\/02\/jass-website-logo-1.png","contentUrl":"https:\/\/jassweb.com\/wp-content\/uploads\/2021\/02\/jass-website-logo-1.png","width":693,"height":132,"caption":"Jass Web"},"image":{"@id":"https:\/\/jassweb.com\/solved\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/jassweb.com\/solved\/#\/schema\/person\/65c9c7b7958150c0dc8371fa35dd7c31","name":"Kirat","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/jassweb.com\/solved\/#\/schema\/person\/image\/","url":"https:\/\/jassweb.com\/solved\/wp-content\/litespeed\/avatar\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1775193939","contentUrl":"https:\/\/jassweb.com\/solved\/wp-content\/litespeed\/avatar\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1775193939","caption":"Kirat"},"sameAs":["http:\/\/jassweb.com"],"url":"https:\/\/jassweb.com\/solved\/author\/jaspritsinghghumangmail-com\/"}]}},"_links":{"self":[{"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/posts\/12211","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/comments?post=12211"}],"version-history":[{"count":0,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/posts\/12211\/revisions"}],"wp:attachment":[{"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/media?parent=12211"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/categories?post=12211"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/tags?post=12211"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}