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Questions tagged [thread-synchronization]

In a multi-threaded environment thread synchronization is used to coordinate access to shared resources such as file handles, network connections, and memory

In a multi-threaded environment thread synchronization is used to coordinate access to shared resources such as file handles, network connections, and memory

References

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Why does the below code increment value with 2 rather than 1?(New to Java)

In the below code after a thread runs the increment method it prints value 2 to the console.Shouldn't the value be 1 since the method increments it with 1? class TestSync implements Runnable { private int balance; public void run() { …
Maaz Shaikh
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How to Synchronizing / Locking a Variable right?

I have a problem understanding synchronized(){} in Java. Somehow I thought that synchronized(this) I locking THIS instance of the Class and if I wanna access an attribute OR calling a function of this particular instance from another thread, than…
felixbreuer
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ReentrantLock tryLock()

This is the source code of ReentrantLock#tryLock: public boolean tryLock() { return sync.nonfairTryAcquire(1); } My question is that: There are two types of Synchronizers: FairSync and NonFairSync in the ReentrantLock. Why only the…
jimwi
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Synchronize two functions into separate classes

In a class there are different functions. In a separate file in another class I want to catch the messages and print to gui. As a simulation I have the following code: import threading import time import…
Vasilis
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Updating GUI through threads

I'm fairly new to threads and haven't written Java in a long time so bear with me here. I have a very simple GUI. It has a counter, a status label, and two buttons, start and stop respectively. What I wanted it to do was update my status label using…
A curious one
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Can I do random writes from a kernel without worrying about synchronization issues?

Consider a simple depth-of-field filter (my actual use case is similar). It loops over the image and scatters every pixel over a circular neighborhood of its. The radius of the neighborhood depends on the depth of the pixel - the closer the it is to…
Stefan Monov
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TBB spin_mutex inside parallel_for to block a critical section

Conceptually, how can I block a critical section inside a tbb::parallel_for call using tbb:spin_mutex? The critical section is less than 20 instructions so spin_mutex is ideal. For example the following dummy code explains the situation: function()…
kishansudu
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Java Threads | Producer Consumer : What's wrong with the code?

Trying to learn multithreading and inter-process communication of threads. Have implemented a typical producer-consumer problem. However, the output am getting is pretty sequential which should not be the case while working with threads ideally. Ok,…
roger_that
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Choosing right object for locking in thread synchronization?

Generally code samples use locks this way: static readonly object lockForWorkingWithSharedObject = new object(); lock(lockForWorkingWithSharedObject) { // do something with shared object } This way we need many locks in a large class. Is it…
Xaqron
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State of a signaled thread in Java when calling condition.signal()

I am looking for the answer to the following question. Suppose we have two threads in Java. We synchronize them by using Lock and Condition classes on the same object of Lock: Thread A calls: condition.await(); Thread B does some work and then…
user6595600
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TQueue gets never emptied if Dequeue used as a procedure parameter

interface type TMulticastListenerThread = class(TThread) strict private ..... _queue: TQueue; FOnReceive: TGetStrProc; procedure DoReceive(); ..... public ..... procedure Execute(); override; property OnReceive:TGetStrProc…
Paul
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thread synchronization between c# and c++

I have a C# WPF app that needs to call an unmanaged C++ DLL and get a simple event notification from it. The DLL will wait for a keyboard event that can't be seen in .NET (VK_MEDIA_PLAY_PAUSE while the app doesn't have the input focus), and notify…
Gregor J
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How to assign different threads to different methods of other class not using main main thread

Lets say I have a main class Start.java public class Start{ //Here I want to integrate the programs for which i will be needing threads } and I also have two more classes which contains two different methods. public class ReadUpdateDb { …
Tejas Zambre
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Thread safety in google endpoints and Objectify and how does allocateId works ?

I have an OfyService class of this type /** * Custom Objectify Service that this application should use. */ public class OfyService { /** * This static block ensure the entity registration. */ static { …
Utkarsh Saxena
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One-time wake a waiting thread in Python

I have a Python object that is updated regularly, from an asynchronous I/O callback. A few threads need to wait for this object to be updated. This "update" event is an instantaneous event, and as well the action of telling the waiting threads to…
Nathan.Eilisha Shiraini
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