multithreading

问题 My program keeps expanding. In my MainProgram method in the MainPanel class I'm using some functions from an other program. While using this the GUI hangs until that is finished and I want to solve this by using a new thread for this method. While doing this I get an error when executing OnRun. It says: Unhandled exception in thread started by <bound method MainPanel.OnIndex of <__main__.MainPanel; proxy of <Swig Object of type 'wxPanel *' at 0x526e238> >> It think this has something to do

问题 i found an answer here on using threads for http requests Just want to ask, in the accepted answer: for my $url ('http://www.google.com/', 'http://www.perl.org/') { push @threads, async { $ua->get($url) }; } if i have more than 20K urls to fetch, is this approach of pushing to array @threads inside this for loop advisable? Or should i restructure it to handle more than 20K list items? How can i do it such that it doesn't crash my system? thanks 回答1: That is quite a few threads to launch. It's

问题 i'm trying to use WebBrowser in ASP.net but i found an error from Thread WebBrowser webget = new WebBrowser(); webget.Navigate("aaaaaa"); HtmlDocument d = webget.Document; Console.WriteLine(d); Console.Read(); The error is : Unable to instantiate ActiveX control '8856f961-340a-11d0-a96b-00c04fd705a2' because the current thread is not a single-threaded apartment (STA) thread. 回答1: this is an expected behavior as asp.net was designed for concurrency and will not mak any since using STA and this

问题 i'm trying to use WebBrowser in ASP.net but i found an error from Thread WebBrowser webget = new WebBrowser(); webget.Navigate("aaaaaa"); HtmlDocument d = webget.Document; Console.WriteLine(d); Console.Read(); The error is : Unable to instantiate ActiveX control '8856f961-340a-11d0-a96b-00c04fd705a2' because the current thread is not a single-threaded apartment (STA) thread. 回答1: this is an expected behavior as asp.net was designed for concurrency and will not mak any since using STA and this

问题 I have the following scenario using Jmeter 3.3: I would like to run " Get auth token " once every 2.5 minutes and meanwhile to run [GET] thread group non stop. In other words, [GET] is taking the auth token from the first thread group and I would like to run them in parallel and only change the token once at 2.5 min. I tried to add a Constant Timer to the first thread but the second thread is not running until the timer passed. How can I keep the [GET] running non-stop and " Get Auth token "

问题 I'm using WinApi. Is SendMessage/PostMessage a good, thread safe method of communicating with the main window? Suppose, the working thread is creating a bitmap, that must be displayed on the screen. The working thread allocates a bitmap, sends a message with a pointer to this bitmap and waits until GUI thread processes it (for example using SendMessage). The working thread shares no data with other threads. Am I running into troubles with such design? Are there any other possibilities that do

问题 I'm using WinApi. Is SendMessage/PostMessage a good, thread safe method of communicating with the main window? Suppose, the working thread is creating a bitmap, that must be displayed on the screen. The working thread allocates a bitmap, sends a message with a pointer to this bitmap and waits until GUI thread processes it (for example using SendMessage). The working thread shares no data with other threads. Am I running into troubles with such design? Are there any other possibilities that do

问题 I need to make an asynchronous call so that the second method is only called after the first one is completed.Both methods are network calls. Something like this: signIn() getContacts() I want to make sure that getContacts only gets called after the signIn is completed. FWIW, I can't edit the methods signatures because they are from a Google SDK. This is what I tried: let queue = DispatchQueue(label: "com.app.queue") queue.async { signIn() getContacts() } 回答1: Async calls, by their nature, do

问题 I've implemented a tiny webserver in a separate thread using the nice libevent library. The webserver runs event_base_dispatch() to process all events. What I need is a way to break out this dispatch loop from the main thread. It boils down to the following C++ code: #include <stdlib.h> #include <signal.h> #include <thread> #include <evhttp.h> struct event_base *eb; std::thread t; static volatile sig_atomic_t bailout = false; void my_signal_handler(int) { bailout = true; } void onRequest

问题 I've implemented a tiny webserver in a separate thread using the nice libevent library. The webserver runs event_base_dispatch() to process all events. What I need is a way to break out this dispatch loop from the main thread. It boils down to the following C++ code: #include <stdlib.h> #include <signal.h> #include <thread> #include <evhttp.h> struct event_base *eb; std::thread t; static volatile sig_atomic_t bailout = false; void my_signal_handler(int) { bailout = true; } void onRequest