multithreading

问题 Helgrind is a Valgrind tool for detecting synchronisation errors in C, C++ and Fortran programs that use the POSIX pthreads threading primitives. Anyone knows an equivalent tool for windows? After googling a bit I haven't found anything... 回答1: For the people that eventually should land there: I've found that: Intel thread checker: should be pretty similar to Hellgrind. 回答2: The only thing of heard of in this area is CHESS, from Microsoft Research. Never used it though. No idea if its

问题 I have Thread which runs while the program runs and polls a queue and check whether it has object and if yes then it calls method on the object Here is the code : while(isRunning){ synchronized (loginQueue) { if(loginQueue.peek() != null) { Object[] loginObjectWithConnection = loginQueue.poll(); tryLogin(loginObjectWithConnection); } } try { Thread.sleep(10); } catch (InterruptedException e) { e.printStackTrace(); } } Here is the tryLogin method private void tryLogin(Object[]

问题 I am working on this example, but I am unable to mesh the callback and the threading. What I want is this. 1) Press button 2) Start the progress bar running 3) Call to a new thread to perform some long running process 4) A callback on the long running process should trigger the progress bar to stop. Below I have something...Although the callback parameter for DoSomethingInThread comes in as null. The StopProgressBar() acts on the ProgressBar control, so it cannot be static. static bool done;

问题 I am debugging some code. My debugger shows that the origin of code is from Thread.run(). I need to know from which part of code Thread.start() was called! Is there a way to find this out? 回答1: You can use new Throwable().getStackTrace() to get a full stack trace. To get the start stack you must extend Thread , one of the few times it is actually necessary to do so (mostly using Runnable is preferred). class C extends Thread { StackTraceElement[] constructed; StackTraceElement[] started;

问题 I am debugging some code. My debugger shows that the origin of code is from Thread.run(). I need to know from which part of code Thread.start() was called! Is there a way to find this out? 回答1: You can use new Throwable().getStackTrace() to get a full stack trace. To get the start stack you must extend Thread , one of the few times it is actually necessary to do so (mostly using Runnable is preferred). class C extends Thread { StackTraceElement[] constructed; StackTraceElement[] started;

问题 I have a java class SomeClass implements Runnable Which has a method display(). When I create a thread of this class Thread thread1 = new Thread(new SomeClass()); Now how I can call the display() method using the thread instance? 回答1: You will end up calling start() on thread1 . SomeClass will override run() method which in turn need to call display() method. This way when you call start() , run method of SomeClass() object will be invoked and display() method will be executed. Example:

问题 I'm developing a Java app that for much of the time, including the point of shutdown, is having to deal with a flood of incoming asynchronous calls from a foreign framework. During normal operation these incoming calls then need to be dispatched to another framework, again asynchronously. At the moment I'm having my module be a "good" citizen and do some locking around a shutdown flag which, once set, will gracefully cease the dispatch of any further outgoing calls. The troubling thing is

问题 I'm developing a Java app that for much of the time, including the point of shutdown, is having to deal with a flood of incoming asynchronous calls from a foreign framework. During normal operation these incoming calls then need to be dispatched to another framework, again asynchronously. At the moment I'm having my module be a "good" citizen and do some locking around a shutdown flag which, once set, will gracefully cease the dispatch of any further outgoing calls. The troubling thing is

问题 Note: this is NOT a duplicate of this quesiton. Given a complex software parallelized with TBB, how do I completely switch off threading? I'm aware of the task_scheduler_init: int nthreads = tbb::task_scheduler_init::default_num_threads(); const char* cnthreads = getenv("TBB_NUM_THREADS"); if (cnthreads) nthreads = std::max(1, atoi(cnthreads)); tbb::task_arena arena(nthreads, 1); tbb::task_scheduler_init init(nthreads); However, this solution (related to this) does not switch off threading.

问题 Like many of the novices of android programming, I used Lunar Lander as a guide for implementing the SurfaceView. I'm practicing by creating a version of PONG. The basic structure of the code is the same as LunarLander. Obviously, I soon discovered the bug that was in Lunar Lander. The immediate way I got around this is by instantiating a new Thread object in SurfaceCreated() and starting it, when the original thread can't be started (which incidentally, is the same method that a lot of