c++ - Determine if code is running in specific thread -

-

in application run background operation using snippet:

m_thread = std::thread(&myclass::backop, this);

sometimes different threads (including m_thread itself, possibly) in application call function close() waits background thread complete operation:

if(m_thread.joinable()) m_thread.join();

and unsafe behaviour, if right, may cause deadlock.

can determine in close() function text, if running in background thread, skip "joining"?

thank you!

can determine in close() function if running in background thread, skip "joining"?

yes, can use std::this_thread::get_id() function , compare m_thread.get_id() determine if routine runs within same std::thread instance.


Comments

Post a Comment

Popular posts from this blog

javascript - How to process users in one specific order using map o each function? -

-
i create cloud function process items in specific order , make network request api each item , update them result of api. i tried this. order not respected , computation of "remainingcredits" wrong. note function "getuserpageview()" make api call , return promise result. query.descending("createdat"); return query.find().then(function(items) { var remainingcredits=0; var promises= _.map(items, function(item){ var credit=item.get("credit_buy"); return getuserpageview(123, new date()).then(function(pageviews){ var usedcredit=credit-pageviews; if(remainingcredits>0) return remainingcredits+credit; if(credit-usedcredit<=0){ console.log("usedcredit:"+usedcredit); item.set("used",true); return 0; }else{ remainingc...
Read more

java - Two interface have same method name with different return type -

-
this question understanding interfaces in java. here simple example of implementing interfaces in java. interface parenta { void display(); } interface parentb { int display(); } class child implements parenta, parentb { @override public void display() { system.err.println("child parenta"); } //error : return type incompatible parentb.display() //so added method int return type @override public int display() { system.err.println("child parentb"); } } this case can happen in large java application 2 interface can have method same name. thought since return type different jvm know interface's method overriding. what best explanation this? situation make sense? thanks in advance because method same signature not allowed, confuses compiler detect exact override-equivalent method declared once. jls (§8.4.2) 2 methods or constructors, m , n, have same signature if have, ...
Read more

javascript - Linking from page A to a specific iframe on page B -

-
i'm in process of setting website showcase our photographs. for using third party supplier providing gallery: http://gallery.wisejam.com/index.html . however, in order keep visitors on our own website, have set gallery on page iframe: http://wisejam.com/gallery-2/ up here, works fine. now, cannot go further when wish deep link post/page photograph open in iframe. it works long visitor on page (gallery-2) following code... <a href="http://gallery.wisejam.com/featured/distortion-clear-waters-robert-schaelike.html" target="iframe_a">distortion</a> however, i'm trying achieve internal links display in iframe of 'gallery-2', not have send them artists' page. wish keep visitors us! i'm sorry if simple question ask i'm not professional programmer. many input , help! you write : target="iframe_a" photos go frame named : name="iframe_a" . please check . if upload full code able gi...
Read more