multithreading

问题 What are the ways to detect deadlocks in a live multi-threaded application? If we found there is a deadlock, are there any ways to resolve it, without taking down/restarting the application? 回答1: There are two popular ways to detect deadlocks. One is to have threads set checkpoints. For example, if you have a thread that has a work loop, you set a timer at the beginning of doing work that's set for longer than you think the work could possibly take. If the timer fires, you assume the thread

问题 What are the ways to detect deadlocks in a live multi-threaded application? If we found there is a deadlock, are there any ways to resolve it, without taking down/restarting the application? 回答1: There are two popular ways to detect deadlocks. One is to have threads set checkpoints. For example, if you have a thread that has a work loop, you set a timer at the beginning of doing work that's set for longer than you think the work could possibly take. If the timer fires, you assume the thread

问题 Nodejs can not have a built-in thread API like java and .net do. If threads are added, the nature of the language itself will change. It’s not possible to add threads as a new set of available classes or functions. Nodejs 10.x added worker threads as an experiment and now stable since 12.x. I have gone through the few blogs but did not understand much maybe due to lack of knowledge. How are they different than the threads. 回答1: Worker threads in Javascript are somewhat analogous to WebWorkers

问题 I am working on Flux and Mono and using them in multi threaded environment and using the Schedular which provide the worker thread. There are many options to start the Schedular using elastic, parallel and newElastic. Here is the code which i used: System.out.println("------ elastic --------- "); Flux.range(1, 10) .map(i -> i / 2) .publishOn(Schedulers.elastic()).log() .blockLast(); System.out.println("------ new elastic --------- "); Flux.range(1, 10) .map(i -> i / 2).log() .publishOn

问题 I have the following setup in my code that utilizes the TPL: One field in my class: private CancellationTokenSource _cancellationTokenSource; This CancellationTokeSource gets instatiated every time I create a TPL task that uses that particular cancellationtoken The actualy TPL tasks look like this: var dataRetrievalTask = new Task<List<myType>>(() => { // retrieve data and do something foreach (var a in retrievalMethod()) { if (_cancellationTokenSource.Token.IsCancellationRequested)

问题 I have the following setup in my code that utilizes the TPL: One field in my class: private CancellationTokenSource _cancellationTokenSource; This CancellationTokeSource gets instatiated every time I create a TPL task that uses that particular cancellationtoken The actualy TPL tasks look like this: var dataRetrievalTask = new Task<List<myType>>(() => { // retrieve data and do something foreach (var a in retrievalMethod()) { if (_cancellationTokenSource.Token.IsCancellationRequested)

问题 I am wondering how to cancel an input read after a timer expires. I am currently reading from input with fmt.Fscanln(reader, &var) I have a channel that will be filled with a value as soon as the timer expires. I currently have the scan happening on a different go routine. This way, the function that scan's will return when it runs out of time. The problem is if the io.Reader passed to fmt.Fscanln is reading from stdin , it will still wait for input after its goroutine is over. Is there a way

问题 I have a logging code which needs to be executed after all Threads s are executed. Thread t1 = new MyThread(); Thread t2 = new MyThread(); t1.run(); t2.run(); doLogging(); Is there any way to execute doLogging() only after both threads are done with their processing. Now that doLogging() is called as soon as t1 and t2 are started. 回答1: Just join() all threads before your doLogging() call: t1.join(); t2.join(); // the following line will be executed when both threads are done doLogging(); Note

问题 I have a logging code which needs to be executed after all Threads s are executed. Thread t1 = new MyThread(); Thread t2 = new MyThread(); t1.run(); t2.run(); doLogging(); Is there any way to execute doLogging() only after both threads are done with their processing. Now that doLogging() is called as soon as t1 and t2 are started. 回答1: Just join() all threads before your doLogging() call: t1.join(); t2.join(); // the following line will be executed when both threads are done doLogging(); Note

问题 I have a logging code which needs to be executed after all Threads s are executed. Thread t1 = new MyThread(); Thread t2 = new MyThread(); t1.run(); t2.run(); doLogging(); Is there any way to execute doLogging() only after both threads are done with their processing. Now that doLogging() is called as soon as t1 and t2 are started. 回答1: Just join() all threads before your doLogging() call: t1.join(); t2.join(); // the following line will be executed when both threads are done doLogging(); Note