In a low level language (C, C++ or whatever): I have the choice in between either having a bunch of mutexes (like what pthread gives me or whatever the native system library provides) or a single one for an object. How efficient is it to lock a mutex? I.e. how many assembler instructions are there … Read more
I have the following class. class Test{ public HashSet<string> Data = new HashSet<string>(); } I need to change the field “Data” from different threads, so I would like some opinions on my current thread-safe implementation. class Test{ public HashSet<string> Data = new HashSet<string>(); public void Add(string Val){ lock(Data) Data.Add(Val); } public void Remove(string Val){ lock(Data) … Read more
POSIX allows mutexes to be recursive. That means the same thread can lock the same mutex twice and won’t deadlock. Of course it also needs to unlock it twice, otherwise no other thread can obtain the mutex. Not all systems supporting pthreads also support recursive mutexes, but if they want to be POSIX conform, they … Read more
Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. We don’t allow questions seeking recommendations for books, tools, software libraries, and more. You can edit the question so it can be answered with facts and citations. Closed 2 years ago. Improve this question I’m new to multithreading, and was … Read more
I’m reading up on pthread.h; the condition variable related functions (like pthread_cond_wait(3)) require a mutex as an argument. Why? As far as I can tell, I’m going to be creating a mutex just to use as that argument? What is that mutex supposed to do? 10 Answers 10
I’ve searched the Swift book, but can’t find the Swift version of @synchronized. How do I do mutual exclusion in Swift? 23 Answers 23
I think both are doing the same job,how do you decide which one to use for synchronization? 8 Answers 8
The Mutex class is very misunderstood, and Global mutexes even more so. What is good, safe pattern to use when creating Global mutexes? One that will work Regardless of the locale my machine is in Is guaranteed to release the mutex properly Optionally does not hang forever if the mutex is not acquired Deals with … Read more
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 only one thread to enter the part that’s locked and the lock is not shared with any other processes. A mutex is the same as a lock but it can be system … Read more
Using C# and WPF under .NET (rather than Windows Forms or console), what is the correct way to create an application that can only be run as a single instance? I know it has something to do with some mythical thing called a mutex, rarely can I find someone that bothers to stop and explain … Read more
