So i've read around that instead of calling a event directly with if (SomeEvent != null) SomeEvent(this, null); i should be doing SomeEventHandler temp = SomeEvent; if (temp != null) temp(this, null); Why is this so? How does the second version become thread safe? What is the best practice? ...
#include <pthread.h> #include <stdio.h> #include <stdlib.h> #define NUM_THREADS 4 #define TCOUNT 5 #define COUNT_LIMIT 13 int done = 0; int count = 0; int thread_ids[4] = {0,1,2,3}; int thread_runtime[4] = {0,5,4,1}; pthread_mutex_t count_mutex; pthread_cond_t count_threshold_cv; void *inc_count(void *t) { ...
Hi. Am a c-coder for a while now - neither a newbie nor an expert. Now, I have a certain daemoned application in C on a PPC Linux. I use PHP's socket_connect as a client to connect to this service locally. The server uses epoll for multiplexing connections via a Unix socket. A user submitted string is parsed for certain characters/words ...
I want to check users' subscribed dates for certain period. And send mail to users whose subscription is finishing (ex. reminds two days). I think the best way is using thread and timer to check dates. But I have no idea how to call this function. I don't want to make a separate program or shell. I want to combine this procedure to my dj...
Hi, I'm newbie to groovy/grails. How to implement thread for this code . Had 2500 urls and this was taking hours of time for checking each url. so i decided to implement multi-thread for this : Here is my sample code : def urls = [ "http://www.wordpress.com", "http://67.192.103.225/QRA.Public/" , "http://www.subaru.com", "htt...
Hi all, I want to have my own progress bar in .net compact framework, instead of default wait cursor. I have tried with a form, having only a progress bar, and showing and hiding the form when I want to show some background activity running, but that does not update the progress bar. I have found out that it needs to be on different thr...
Hi all, I am trying to use a separate thread for working with some API. The problem is that I am not able to use performSelector:onThread:withObject:waitUntilDone: method with a thread that I' instantiated for this. My code: @interface MyObject : NSObject { NSThread *_myThread; } @property(nonatomic, retain) NSThread *myThread; @en...
Hello.. I am creating a web application using zend, here i create an interface from where user-A can send email to more than one user(s) & it works excellent but it slow the execution time because of which user-A wait too much for the "acknowledged response" ( which will show after the emails have sent. ) In Java there are "Threads" by...
Hello, everyone I cannot get a way to terminate a thread that is hung in a socket.recvfrom() call. For example, ctrl+c that should trigger KeyboardInterrupt exception can't be caught. Here is a script I've used for testing: from socket import * from threading import Thread from sys import exit class TestThread(Thread): def __init_...
Hi, I'm developing a thread safe class that I'll use as cache, it should work in .NET and Mono. The items have a time to live, and every time that a object is retrieved, its time to live is refreshed. Each time that I add a item, the timestamp is added to another collection that holds the same keys. A timer raises the method that look...
I have the following Java code: final Future future = exeService.submit( new Runnable() { public void run() { myObject.doSomething(); } } ); future.get(); where exeService is an instance of java.util.concurrent.ExecutorService The problem is that myObject.doSomething() never returns, and, hence...
We were surprised to learn today that threads waiting on a ManualResetEvent continue waiting on the event even when it's closed. We would have expected that calling Close() would implicitly signal the waiting threads. We tracked this down as a reason some of our windows services were not shutting down as fast as we'd like. We're chang...
Consider a Console application that starts up some services in a separate thread. All it needs to do is wait for the user to press Ctrl+C to shut it down. Which of the following is the better way to do this? static ManualResetEvent _quitEvent = new ManualResetEvent(false); static void Main() { Console.CancelKeyPress += (sender,...
Hello I want to use setitimer() (or alarm()) in multithreaded process in linux 2.6+ with NPTL-enabled libc. Which thread will receive sigalarm (SIGALRM) from kernel? Thanks. ...
Hi everyone, I'm getting weird string corruption across JNI calls which is causing problems on the the Java side. Every so often, I'll get a corrupted string in the passed array, which sometimes has existing parts of the original non-corrupted string. The C++ code is supposed to set the first index of the array to the address, it's a nas...
main thread--> start workthread-->StartStage(get list of positions for data process) --> move to one position --> data sampling --> data collection-->data analysis------>data sampling basically, work thread does the data sampling --> data collection-->data analysis------>data sampling loop for one positioin until press stop or target is...
i have a (perhaps stupid) question: im using 2 threads, one is writing floats and one is reading this floats permanently. my question is, what could happen worse when i dont synchronize them? it would be no problem if some of the values would not be correct because they switch just a little every write operation. im running the applica...
From what I understand, the entire client side of a GWT application is converted to Javascript when you build, therefore I suppose this question is related to both Javascript and the possibilities that GWT offers. I have a couple of dozen processes that will need to be initiated in my GWT application, each process will then continuously...
Let's say i have a Domain Model that im trying to make compatible with multithreading. The prototype domain is a game domain that consists of Space, SpaceObject, and Location objects. A SpaceObject has the Move method and Asteroid and Ship extend this object with specific properties for the object (Ship has a name and Asteroid has a colo...
I need to implement in my class "Invoke()" method with the same behavior as Control.Invoke() has. So when I am working with the instance of my InvokableEntity class from a thread different from thread where instance was created, I will be able to call invokableEntity.Invoke(delegate) and delegate will be executed in the context of the ...