multithreading

问题 I am a new coder. I am having trouble adding a start and stop button for this piece of example code that i am working off. I'm sure i have to mess with with Thread.sleep(10); in the game class. This code starts the game when the program is run. is there a way i could add start button to start the thread. I have created j button already. Thanks. Game Class import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.RenderingHints; import java.awt.event.KeyEvent; import java.awt.event

问题 I am a new coder. I am having trouble adding a start and stop button for this piece of example code that i am working off. I'm sure i have to mess with with Thread.sleep(10); in the game class. This code starts the game when the program is run. is there a way i could add start button to start the thread. I have created j button already. Thanks. Game Class import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.RenderingHints; import java.awt.event.KeyEvent; import java.awt.event

问题 In my Activity, I load the content for a list from a DB, and want to display a ProgressDialog while it´s loading. I got both working on it´s own, but if I load the data in a thread (which I should do?), the list is displayed before it´s data is loaded. But if I use join, the ProgressDialog doesnt even appear. How can I combine this? Or is this not possible at all with threads? (AsyncTask maybe?) Here´s the code for reference: final ProgressDialog progressD=ProgressDialog.show

问题 i get the following error in my gradle console. Tried looking for the deprecated API but couldn't find it. Thanks in advance!!! Error: DemoActivity.java uses or overrides a deprecated API. Note: Recompile with -Xlint:deprecation for details. public class BaseActivity extends ActionBarActivity { private static final String TAG = "DemoActivity"; DrawerLayout mDrawerlDrawerLayout; FrameLayout actContent; private LinearLayout linear; private ActionBarDrawerToggle actionBarToggle; private Toolbar

问题 I have a web application that synchronizes with a central database four times per hour. The process usually takes 2 minutes. I would like to run this process as a thread at X:55, X:10, X:25, and X:40 so that the users knows that at X:00, X:15, X:30, and X:45 they have a clean copy of the database. It is just about managing expectations. I have gone through the executor in java.util.concurrent but the scheduling is done with the scheduleAtFixedRate which I believe provides no guarantee about

问题 I have a code with following structure #pragma omp parallel { #omp for nowait { // first for loop } #omp for nowait { // first for loop } #pragma barrier <-- #pragma omp single/critical/atomic --> not sure dgemm_(....) #pragma omp for { // yet another for loop } } For dgemm_, I link with multithreaded mkl. I want mkl to use all available 8 threads. What is the best way to do so? 回答1: This is a case of nested parallelism. It is supported by MKL, but it only works if your executable is built

问题 Suppose I need to read many distinct, independent chunks of data from the same file saved on disk. Is it possible to multi-thread this upload? Related: Do all threads on the same processor use the same IO device to read from disk? In this case, multi-threading would not speed up the upload at all - the threads would just be waiting in line. (I am currently multi-threading with OpenMP.) 回答1: Yes, it is possible. However: Do all threads on the same processor use the same IO device to read from

问题 Is here any performance benefit to using multiple threads on a computer with a single CPU that does not having hyperthreading? 回答1: In terms of speed of computation, No. In fact things will slow down due to the overhead of managing the threads. In terms of responsiveness, yes. You can for example have one thread wait on an IO operation and have another run a GUI at the same time. 回答2: It depends on your application. If it spends all its time using the CPU, then multithreading will just slow

问题 I thought thread safe, in particular, means it must satisfy the need for multiple threads to access the same shared data. But, it seems this definition is not enough. Can anyone please list out the things to be done or taken care of to make an application thread safe . If possible, give an answer with respect to C/C++ language. 回答1: There are several ways in which a function can be thread safe. It can be reentrant . This means that a function has no state, and does not touch any global or

问题 This question already has answers here : What is the difference between a synchronized method and synchronized block in Java? [duplicate] (6 answers) Closed 2 years ago . what is the difference between public synchronized void addition() { //something; } and public void addtion() { synchronized (//something) { //something; } } If I am wrong Ignore this question. 回答1: it the first one only one thread can execute whole method at a time whereas in second one only one thread can execute that