{"id":32947,"date":"2023-02-03T06:01:45","date_gmt":"2023-02-03T00:31:45","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-why-do-threads-not-work-properly\/"},"modified":"2023-02-03T06:01:45","modified_gmt":"2023-02-03T00:31:45","slug":"solved-why-do-threads-not-work-properly","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-why-do-threads-not-work-properly\/","title":{"rendered":"[Solved] Why do threads not work properly?"},"content":{"rendered":"

[ad_1]
\n<\/p>\n

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There are quite a few mistakes:<\/p>\n

First, you’re passing pointer to int random<\/code> but in the thread you convert the argument (pointer) to the number. Either you have to cast the int random<\/code> to a pointer or in the thread cast args<\/code> to long *<\/code> and read the memory from that pointer. The latter will actually stop working once you launch several threads as you’ll change the variable content in the meantime or even leave the scope of that variable.<\/p>\n

Secondly, you don’t wait for the thread(s). Use pthread_join<\/code> to wait for thread.<\/p>\n

Third, you run only single thread, you need to create in loop from 0<\/code> to nThreads<\/code> and once launching all of them, call pthread_join<\/code> in similar loop.<\/p>\n

Fourth, the size of int<\/code> is 4 on most platforms while you send only 2 bytes. This may work on low endian platforms but will fail on big endian. Use sizeof(int)<\/code> for both write<\/code> and read<\/code> to make it more portable.<\/p>\n<\/p><\/div>\n

<\/div>\n<\/div>\n

3<\/span> <\/p><\/div>\n<\/div>\n

[ad_2]<\/p>\n

solved Why do threads not work properly? <\/p>\n","protected":false},"excerpt":{"rendered":"

[ad_1] There are quite a few mistakes: First, you’re passing pointer to int random but in the thread you convert the argument (pointer) to the number. Either you have to cast the int random to a pointer or in the thread cast args to long * and read the memory from that pointer. The latter … 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":[324,884,1990],"class_list":["post-32947","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-multithreading","tag-pthreads"],"yoast_head":"\n[Solved] Why do threads not work properly? - 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-why-do-threads-not-work-properly\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Why do threads not work properly? - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] There are quite a few mistakes: First, you’re passing pointer to int random but in the thread you convert the argument (pointer) to the number. 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