{"id":23740,"date":"2022-11-28T03:41:56","date_gmt":"2022-11-27T22:11:56","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-stopping-a-periodic-thread-thing-in-c\/"},"modified":"2022-11-28T03:41:56","modified_gmt":"2022-11-27T22:11:56","slug":"solved-stopping-a-periodic-thread-thing-in-c","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-stopping-a-periodic-thread-thing-in-c\/","title":{"rendered":"[Solved] Stopping a periodic thread-thing in c++"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-48795895\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"48795895\" data-parentid=\"48793504\" data-score=\"0\" 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>Sorry, but I didn&#8217;t find a design simpler than that.<\/p>\n<p>You could, make a class that owns both a thread, and a <code>weak_ptr<\/code> to itself,<br \/>\nto be a &#8220;holder&#8221; that the callable can see it safely, because the callable<br \/>\nwill still exists even if the object is destructed. You don&#8217;t want a dangling pointer.<\/p>\n<pre><code>template&lt;typename T&gt;\nstruct IntervalRepeater {\n    using CallableCopyable = T;\nprivate:\n    weak_ptr&lt;IntervalRepeater&lt;CallableCopyable&gt;&gt; holder;\n    std::thread theThread;\n\n    IntervalRepeater(unsigned int interval,\n            CallableCopyable callable): callable(callable), interval(interval) {}\n\n    void thread() {\n        weak_ptr&lt;IntervalRepeater&lt;CallableCopyable&gt;&gt; holder = this-&gt;holder;\n        theThread = std::thread([holder](){\n            \/\/ Try to strongify the pointer, to make it survive this loop iteration,\n            \/\/    and ensure that this pointer is valid, if not valid, end the loop.\n            while (shared_ptr&lt;IntervalRepeater&lt;CallableCopyable&gt;&gt; ptr = holder.lock()) {\n                auto x = chrono::steady_clock::now() + chrono::milliseconds(ptr-&gt;interval);\n                ptr-&gt;callable();\n                this_thread::sleep_until(x);\n            }\n        });\n    }\n\npublic:\n    const CallableCopyable callable;\n    const unsigned int interval;\n\n    static shared_ptr&lt;IntervalRepeater&lt;T&gt;&gt; createIntervalRepeater(unsigned int interval,\n            CallableCopyable callable) {\n        std::shared_ptr&lt;IntervalRepeater&lt;CallableCopyable&gt;&gt; ret =\n                shared_ptr&lt;IntervalRepeater&lt;CallableCopyable&gt;&gt;(\n                        new IntervalRepeater&lt;CallableCopyable&gt;(interval, callable));\n        ret-&gt;holder = ret;\n        ret-&gt;thread();\n\n        return ret;\n    }\n\n    ~IntervalRepeater() {\n        \/\/ Detach the thread before it is released.\n        theThread.detach();\n    }\n\n};\n\nvoid beginItWaitThenDestruct() {\n    auto repeater = IntervalRepeater&lt;function&lt;void()&gt;&gt;::createIntervalRepeater(\n            1000, [](){ cout &lt;&lt; \"A second\\n\"; });\n    std::this_thread::sleep_for(std::chrono::milliseconds(3700));\n}\n\nint main() {\n    beginItWaitThenDestruct();\n    \/\/ Wait for another 2.5 seconds, to test whether there is still an effect of the object\n    \/\/   or no.\n    std::this_thread::sleep_for(std::chrono::milliseconds(2500));\n    return 0;\n}\n<\/code><\/pre>\n<p>C++ is not JavaScript, but C++ can apply most programming paradigms in different languages.<\/p>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">1<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Stopping a periodic thread-thing in c++ <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] Sorry, but I didn&#8217;t find a design simpler than that. You could, make a class that owns both a thread, and a weak_ptr to itself, to be a &#8220;holder&#8221; that the callable can see it safely, because the callable will still exists even if the object is destructed. You don&#8217;t want a dangling pointer. &#8230; <a title=\"[Solved] Stopping a periodic thread-thing in c++\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-stopping-a-periodic-thread-thing-in-c\/\" aria-label=\"More on [Solved] Stopping a periodic thread-thing in c++\">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":[324,413,4317,884],"class_list":["post-23740","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-function","tag-intervals","tag-multithreading"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Stopping a periodic thread-thing in c++ - 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-stopping-a-periodic-thread-thing-in-c\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Stopping a periodic thread-thing in c++ - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Sorry, but I didn&#8217;t find a design simpler than that. You could, make a class that owns both a thread, and a weak_ptr to itself, to be a &#8220;holder&#8221; that the callable can see it safely, because the callable will still exists even if the object is destructed. You don&#8217;t want a dangling pointer. ... 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