event-loop

I have been trying to develop a background Windows application in c++ to capture system wide keystrokes and mouse clicks (no I'm not writing a keystroke logger, just keystroke rates!). For this I have figured out that I need to use Windows Hooks and I came across this excellent video which gave me a basic example. Unfortunately, it uses the QT framework and for licencing (and other time based) reasons, this is not available to me currently. All I need to be able to do is adapt the code so that it does not require the "return a.exec()" line (which I believe is what starts off the event loop). A

I am trying to get my head around python's asyncio. I have written this piece of code just for demonstration to clear concept. import asyncio import threading async def printer(b, a): print(b) await asyncio.sleep(5) print(a) def loop_runner(loop): print('[RUNNING LOOP]') loop.run_forever() if __name__ == '__main__': event_loop = asyncio.get_event_loop() # run_forever() is blocking. running it from separate thread loop_thread = threading.Thread(target=loop_runner, args=(event_loop,)) loop_thread.start() while True: before, after = input('Before :'), input('After :') event_loop.create_task

I am writing a tool in python 2.7 registering the amount of times the user pressed a keyboard or mouse button. The amount of clicks will be displayed in a small black box in the top left of the screen. The program registers clicks even when another application is the active one. It works fine except when I move the mouse over the box. The mouse then freezes for a few seconds after which the program works again. If I then move the mouse over the box a second time, the mouse freezes again, but this time the program crashes. I have tried commenting out pumpMessages() and then the program works.

My client application uses a Kivy GUI (Kivy has its own event loop) and connects to the server using the WebSocket protocol with Tornado (Tornado also has an event loop). That's why the connection part is asynchronous. I want the user to interact with the UI while a Tornado client is running an infinite asynchronous loop of listening for server messages. Here's some example code: client_test.py from tornado.ioloop import IOLoop from tornado.websocket import websocket_connect class RequestSender: url = 'server url here (no scheme)' async def _connect(self): self.conn = await websocket_connect(

The following code just hangs without ever printing anything: import asyncio async def foo(loop): print('foo') loop.stop() loop = asyncio.new_event_loop() asyncio.ensure_future(foo(loop)) loop.run_forever() If I use get_event_loop everything works fine. Is there something I'm doing wrong or have I stumbled upon a bug? I'm using Python 3.5.1. asyncio.AbstractEventLoopPolicy.new_event_loop documentation says: If there’s need to set this loop as the event loop for the current context, set_event_loop() must be called explicitly. import asyncio async def foo(loop): print('foo') loop.stop() loop =

So it turns out the while loop blocks the event loop in JavaScript , which prevents it from being a viable solution to creating a run loop if you want your application to respond to external / async events. My question is, what techniques are used to have a "run loop" be infinite / constant but still have high performance and not block the event loop. I ran a quick test to see the performance of while , setTimeout(fn, 0) (browser), and setImmediate(fn) (node.js). var x = 1000 var isNode = typeof window == 'undefined' function a() { var start = (new Date()).getTime() var q = 0 function next() {