The short answer is that they’re quite heavy (you can’t launch 100+ of them cheaply), and they exhibit unexpected behaviours (somewhat mitigated by recent CPAN modules). You can safely use Perl ithreads by treating them as independent Actors. Create a Thread::Queue::Any for “work”. Launch multiple ithreads and “result” Queues passing them the (“work” + own … Read more
Yes, it is thread-safe. However, you should know that WCF will automatically serialize the execution of CalculateSomething when it is called from more than one thread using the same ClientBase instance. So if you were expecting CalculateSomething to run concurrently then you will have to rethink your design. Take a look at this answer for … Read more
There are many ways to do that, but I would do something simple like the following. import scala.concurrent.ops._ spawn { while (true) { Thread.sleep(1000); // clear the cache’s old entries } } Hope this helps.
Multi-threading and parallel processing are two completely different topics, each worthy of its own conversation, but for the sake of introduction… Threading: When you launch an executable, it is running in a thread within a process. When you launch another thread, call it thread 2, you now have 2 separately running execution chains (threads) within … Read more
The core issue, I imagine, is the network side. If you have 10,000 links and forkIO for each link, then you potentially have 10,000 sockets you’re attempting to open at once, which, depending on how your OS is configured, probably won’t even be possible, much less efficient. However, the fact that we have green threads … Read more
For pthreads it will result in undefined behaviour. From the man page for pthread_mutex_unlock: Calling pthread_mutex_unlock() with a mutex that the calling thread does not hold will result in undefined behavior. Other mutexes will have their own behviour. As others have stated, it’s best to read the manual for whichever mutex you’re using.
Blocking may or may not be the same as synchronous, depending on the context. When we talk about method calls, then a synchronous call can also be said to be blocking (I’ll get back to this in a bit), because the thread calling the method cannot proceed forward until the method returns. The antonym in … Read more
After a lot of time and research trying to fix this problem I found a solution that worked for me. I am using msbuild with /m and /p:BuildInParallel=true and the build was failing in the CI server. It was always failing in the second componen with the error: error MSB4166: Child node “3” exited prematurely. … Read more
Yes, it is possible to move only one or some variables into a closure (rather than all or none). Yes, this can be used to “circumvent” reference counting. I found an answer in the documentation of rayon::scope that turns out to be exactly about this problem: ‘Accessing the stack data [from within a scoped threads … Read more
For both terminating and suspending a thread you can use channels. Terminated externally On each iteration of a worker loop, we check if someone notified us through a channel. If yes or if the other end of the channel has gone out of scope we break the loop. use std::io::{self, BufRead}; use std::sync::mpsc::{self, TryRecvError}; use … Read more