Then, we define the class Decorator to decorate the int objects returned by the getters of a Proxy object in order to inform its setters whether the increment or decrement operators += and -= have been used by adding an action attribute, in which case the setters request an 'increment' or 'decrement' operation instead of a 'set' operation. Self._request_queue.put((sender, action, target, x(self): Return Decorator(self._response_queue.get()) Self._request_queue.put((sender, 'get', target)) Sender = multiprocessing.current_process().name Responses are of the form value (to 'get' requests): class Proxy(Subject):ĭef _init_(self, request_queue, response_queue): Requests are of the form (sender, action, *args) where sender is the sender name, action is the action name ( 'get', 'set', 'increment', or 'decrement' the value of an attribute), and args is the argument tuple. The interprocess communication will use two multiprocessing.Queue attributes, one for exchanging requests and one for exchanging responses. Next, we define a class Proxy for instantiating an object that will be the remote proxy through which the child processes will request the parent process to retrieve or update the attributes of the Subject object. It uses message passing with multiprocessing.Queue objects (instead of shared memory with multiprocessing.Value objects) and process-safe (atomic) built-in increment and decrement operators += and -= (instead of introducing custom increment and decrement methods) since you asked for it.įirst, we define a class Subject for instantiating an object that will be local to the parent process and whose attributes are to be incremented or decremented: import multiprocessing Here is a solution to your problem based on a different approach from that proposed in the other answers. I = p.map_async(analyze_data, inputs, chunksize = 1) P = Pool(initializer = init, initargs = (counter, )) # create the pool of workers, ensuring each one receives the counter # initialize a cross-process counter and the input lists # += operation is not atomic, so we need to get a lock: ''' increment the global counter, do something with the input ''' Note it uses global values which I would really try to avoid in practice: from multiprocessing import Pool, Value Here's a working version of your example (with some dummy input data). In your case you might want to share a Value instance between your workers See this section of the documentation for some techniques you can employ to share state between your processes. This is an easy and convenient app for your smartphone for counting tasks.The problem is that the counter variable is not shared between your processes: each separate process is creating it's own local instance and incrementing that. Multi Counter is simply and easy tool for counting things easily with clicks. If the setting is enabled the counter will bypass the range limit but provide you with the appropriate warning. *Can counter go below minimum/maximum: This switch will define whether the counter can go above or below the maximum or minimum count respectively. *Minimum/Maximum value: This Defines the range of the counter in which it can operate, this can be paired up with the other option "Can counter go below minimum/maximum" which is explained ahead. *Accidental reset: Multi Counter provides safety to accidental reset by making long press of the reset button compulsory to reset the counter. *Long press increment/decrement: This determines the increment or decrement of the counter on long press of the counter button *Tap increment/decrement: This determines the increment or decrement of the counter on tap of the counter button Click on edit button on top right of the screen (pencil icon) The app is extremely helpful for the daily tasks or the professionals who needs to count stuff very frequently. And also specify whether the counter can pass these value or not if it will pass these value then the warning message will be given. You can set maximum and minimum count value for the counter. Each counter will be given a beautiful random color palate. You can create unlimited counter with custom name. Like Glass of water, Steps in a day, People meet in a day, Number of pushups, Goal in football, Grain of salt you name it. Multi Counter is simple, beautiful, easy-to-use and handy counter app to count everything. Simple and handy counter to count daily tasks or keep track of other things
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |