How efficient is locking an unlocked mutex? What is the cost of a mutex?
In a low level language (C, C++ or whatever): I have the choice in between either having a bunch of mutexes (like what … Read more
locking
Concurrent HashSet in .NET Framework?
I have the following class. class Test{ public HashSet<string> Data = new HashSet<string>(); } I need to change the field “Data” from different … Read more
Recursive Lock (Mutex) vs Non-Recursive Lock (Mutex)
POSIX allows mutexes to be recursive. That means the same thread can lock the same mutex twice and won’t deadlock. Of course it … Read more
Effect of NOLOCK hint in SELECT statements
I guess the real question is: If I don’t care about dirty reads, will adding the with (NOLOCK) hint to a SELECT statement … Read more
Do spurious wakeups in Java actually happen?
Seeing various locking related question and (almost) always finding the ‘loop because of spurious wakeups’ terms1 I wonder, has anyone experienced such kind … Read more
Java synchronized method lock on object, or method?
If I have 2 synchronized methods in the same class, but each accessing different variables, can 2 threads access those 2 methods at … Read more
std::lock_guard or std::scoped_lock?
C++17 introduced a new lock class called std::scoped_lock. Judging from the documentation it looks similar to the already existing std::lock_guard class. What’s the … Read more
Is there an advantage to use a Synchronized Method instead of a Synchronized Block?
Can any one tell me the advantage of synchronized method over synchronized block with an example? 23 Answers 23
Why is lock(this) {…} bad?
The MSDN documentation says that public class SomeObject { public void SomeOperation() { lock(this) { //Access instance variables } } } is “a … Read more
What is the difference between lock, mutex and semaphore?
I’ve heard these words related to concurrent programming, but what’s the difference between lock, mutex and semaphore? 10 s 10 A lock allows … Read more