No, you should be doing your calculations in a separate thread. As you already mentioned, there is a work-around available in QCoreApplication::processEvents(), but it sounds like you’re unable to make that work for you. If you don’t want to have to do all the work of setting up a QThread and moving all your code, … Read more
Yes. The OpenMP 4 target constructs were designed to support a wide range of accelerators. Compiler support for NVIDIA GPUs is available from GCC 7+ (see 1 and 2, although the latter has not been updated to reflect OpenMP 4 GPU support), Clang (see 3,4,5), and Cray. Compiler support for Intel GPUs is available in … Read more
Sender cannot be shared between threads, but it can be sent! It implements the trait Send but not Sync (Sync: Safe to access shared reference to Sender across threads). The design of channels intends that you .clone() the sender and pass it as a value to a thread (for each thread you have). You are … Read more
I don’t see how your request is possible, at least not without some exceedingly clever lock-free data structures; what should happen if multiple threads need to insert new values that hash to the same location? In previous work, I’ve used a RwLock<HashMap<K, Mutex<V>>>. When inserting a value into the hash, you get an exclusive lock … Read more
I am not sure that answers are correct here, so let me post my version. There is a difference between process – LWP (lightweight process) and user thread. I will leave process definition aside since that’s more or less known and focus on LWP vs user threads. LWP is what essentially are called today threads. … Read more
First, remember the goal of these ‘synchronizing objects’ : These objects were designed to provide an efficient and coherent use of ‘shared data’ between more than 1 thread among 1 process or from different processes. These objects can be ‘acquired’ or ‘released’. That is it!!! End of story!!! Now, if it helps to you, let … Read more
Jack and Jill happens to want to make a sandwich at the same time. Both need a slice of bread, so they both goes to get the loaf of bread and a knife. Jack gets the knife first, while Jill gets the loaf of bread first. Now Jack tries to find the loaf of bread … Read more
You can use Control.Concurrent.MVar to achieve this. An MVar is essentially a flag which is either ”empty” or “full”. A thread can try to read an MVar and if it is empty it blocks the thread. Wherever you have a thread which performs file IO, create an MVar for it, and pass it that MVar … Read more
One way is to use a hierarchy of critical sections. If you ensure that a parent critical section is never entered within one of its children, deadlocks cannot happen. The difficulty is to enforce this hierarchy.
why is the general consensus that async is better performing than multithreading? (added: I’m talking about the case where either approach is viable and you get to make a choice) On the server side, async lets you make maximum use of threads. Why have one thread handle a single connection when it can handle hundreds? … Read more