queue

As you know from the title, I'm trying to use PriorityQueue with multiprocessing. More precisely, I wanted to make shared PriorityQueue, wrote some code and it doesn't run as I expected. Look at the code: import time from multiprocessing import Process, Lock from Queue import PriorityQueue def worker(queue): lock = Lock() with lock: for i in range(100): queue.put(i) print "worker", queue.qsize() pr_queue = PriorityQueue() worker_process = Process(target = worker, args = (pr_queue,)) worker_process.start() time.sleep(5) # nope, race condition, you shall not pass (probably) print "main", pr

I want to store in a queue, datastructure does not matter, only the elements that I have inserted within say last 5 minutes from current time. Anything older should get removed - so that any time I get the size of the queue it will give count of the objects inserted in last 5 minutes. Basically all I have to know is how many times my app has made a http call to a sever in last 5 minutes before making the next call. If anyone knows of some existing library that may have this implementation please share. You can use a Priority Queue with timestamps as your keys. So that when you call Peek() you

I am trying to learn about creating react-native modules for iOS and there is one aspect that came up Official documentation on threading mentions this block of code alongside its variations - (dispatch_queue_t)methodQueue { return dispatch_get_main_queue(); } There is another undocumented peace I saw a lot in the third party libraries which is this + (BOOL)requiresMainQueueSetup { return NO; } To me, these look kinda similar yet different, hence I wanted to ask for an explanation of following questions When should dispatch_get_main_queue be added to the module and what happens if it is

I can find many examples regarding wait_queue_head . It works as a signal, create a wait_queue_head , someone can sleep using it until someother kicks it up. But I can not find a good example of using wait_queue itself, supposedly very related to it. Could someone gives example, or under the hood of them? From Linux Device Drivers : The wait_queue_head_t type is a fairly simple structure, defined in <linux/wait.h> . It contains only a lock variable and a linked list of sleeping processes. The individual data items in the list are of type wait_queue_t , and the list is the generic list defined

I am trying to use The Queue in python which will be multithreaded. I just wanted to know the approach I am using is correct or not. And if I am doing something redundant or If there is a better approach that I should use. I am trying to get new requests from a table and schedule them using some logic to perform some operation like running a query. So here from the main thread I spawn a separate thread for the queue. if __name__=='__main__': request_queue = SetQueue(maxsize=-1) worker = Thread(target=request_queue.process_queue) worker.setDaemon(True) worker.start() while True: try: #Connect