Recursive property of the mutex operates with the term “owner“, which in case of a shared_mutex is not well-defined: several threads may have .lock_shared() called at the same time. Assuming “owner” to be a thread which calls .lock() (not .lock_shared()!), an implementation of the recursive shared mutex can be simply derived from shared_mutex: class shared_recursive_mutex: … Read more
Yes, there certainly is a difference. A Semaphore is used to throttle access to a resource or block of code. When WaitOne is called a thread will block until a count from the semaphore becomes available. To make a count availabe you would call Release. A semaphore with a maximum count of 1 is often … Read more
There is no app.stop() if that is what you are looking for, however using module atexit you can do something similar: https://docs.python.org/2/library/atexit.html Consider this: import atexit #defining function to run on shutdown def close_running_threads(): for thread in the_threads: thread.join() print “Threads complete, ready to finish” #Register the function to be called on exit atexit.register(close_running_threads) #start … Read more
If the BackgroundWorker was created from the UI thread, then the RunWorkerCompleted event will also be raised on the UI thread. If it was created from a background thread, the event will be raised on an undefined background thread (not necessarily the same thread, unless you’re using a custom SynchronizationContext). Interestingly, this doesn’t seem to … Read more
Celery and RQ is overengineering for simple task. Take a look at this docs – https://docs.python.org/3/library/concurrent.futures.html Also check example, how to run long-running jobs in background for Flask app – https://stackoverflow.com/a/39008301/5569578
Solution to this problem was to upgrade docker from version 18.06.1-ce to 20.10.7. Why? This is because the default seccomp profile of Docker 20.10.9 is not adjusted to support the clone() syscall wrapper of glibc 2.34 adopted in Ubuntu 21.10 and Fedora 35. Source: ubuntu:21.10 and fedora:35 do not work on the latest Docker (20.10.9)
You are correct in that run() does not spawn a separate thread. It runs the thread function in the context of the current thread. It is not clear to me what you are trying to achieve by calling start() in a loop. If you want your thread to repeatedly do something, then move the loop … Read more
When the main thread returns (i.e., you return from the main function), it terminates the entire process. This includes all other threads. The same thing happens when you call exit. You can avoid this by calling pthread_exit. The purpose of pthread_detach is to make it so you don’t need to join with other threads in … 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