single-threaded

Why isn't setTimeout cancelling my loop?

纵饮孤独 提交于 2019-11-30 11:09:43
问题 I wondered how many times can a JavaScript while statement (in Chrome's console) can increment a variable in a millisecond, so I quickly wrote this snippet directly into console: var run = true, i = 0; setTimeout(function(){ run = false; }, 1); while(run){ i++; } The problem is that it runs forever. Why is this happening, and how can I solve it? 回答1: This comes back to the one-threaded nature of JavaScript 1 . What happens is pretty much this: Your variables are assigned. You schedule a

Windows service OnStop wait for finished processing

与世无争的帅哥 提交于 2019-11-30 08:31:34
I actually develop a Windows service in VS 2012 / .NET 4.5. The service is following the scheme of the code snippet below: Using a timer Executes some desired operation every couple of minutes. The process takes about 10 minutes to complete I use a single thread in the service What I am worried about is that if somebody stops the service via the management console, it might be just during the process that the service is doing. I have done some reading about stopping Windows service with request stop, but am a bit lost. Sometimes WorkerThreads are created, sometimes ManualResetEvents are

Windows service OnStop wait for finished processing

怎甘沉沦 提交于 2019-11-29 12:31:57
问题 I actually develop a Windows service in VS 2012 / .NET 4.5. The service is following the scheme of the code snippet below: Using a timer Executes some desired operation every couple of minutes. The process takes about 10 minutes to complete I use a single thread in the service What I am worried about is that if somebody stops the service via the management console, it might be just during the process that the service is doing. I have done some reading about stopping Windows service with

How are the Event Loop, Callback Queue, and Javascript’s single thread connected?

拟墨画扇 提交于 2019-11-28 17:33:47
问题 GENERAL GOAL I’d like to know how the following pieces of a javascript environment interconnect as a system . Javascript Engine Event Loop Event Queue We can limit this to a browser environment since node has been covered in another article (here) THINGS I (believe to) UNDERSTAND: Javascript is single threaded and therefore only has one callstack. Javascript environments provide only a few functions that are truly asynchronous. These may include setTimeout(), setInterval(), and I/O function(s

Node.js server with multiple concurrent requests, how does it work?

送分小仙女□ 提交于 2019-11-26 18:13:47
问题 I know node.js is a single threaded, asynchronous, non blocking i/o. I've read a lot about that. e.g PHP uses one thread per request but node uses only one thread for all, like that. Suppose there are three requests a, b, c arriving at same time at node.js server. Three of these requests require large blocking operation e.g they all want to read same big file. Then how are the requests queued, in what sequence will the blocking operation be carried out and in what sequences are the responses

Single-threaded apartment - cannot instantiate ActiveX control

瘦欲@ 提交于 2019-11-26 14:32:53
I need to get information about applied CSS styles in HTML page. I used AxWebBrowser and iterate IHTMLDOMNode. I'm able to get all the data I need and move the code into my application. The problem is that this part is running inside of the background worker and I got exception when trying to instantiate the control. AxWebBrowser browser = new AxWebBrowser(); ActiveX control '8856f961-340a-11d0-a96b-00c04fd705a2' cannot be instantiated because the current thread is not in a single-threaded apartment. Is there any way how to solve this or other option than AxWebBrowser? JaredPar The problem you

Single-threaded apartment - cannot instantiate ActiveX control

ε祈祈猫儿з 提交于 2019-11-26 03:56:10
问题 I need to get information about applied CSS styles in HTML page. I used AxWebBrowser and iterate IHTMLDOMNode. I\'m able to get all the data I need and move the code into my application. The problem is that this part is running inside of the background worker and I got exception when trying to instantiate the control. AxWebBrowser browser = new AxWebBrowser(); ActiveX control \'8856f961-340a-11d0-a96b-00c04fd705a2\' cannot be instantiated because the current thread is not in a single-threaded