polling

The following question is about the unity game engine, but it could relate to any program trying to send data to a main thread, such as the UI thread. I am processing some data on a separate thread (position data a read asyncrously from a socket). However, I need to act on this data on the main thread (a game object's transform can only be accessed from the main thread). The approach I have in mind is to create a thread-safe queue and follow the producer-consumer pattern. The thread would queue the position data and the main thread would deque the data and act on it. *Note: In Unity I do not

I'm writing an application that monitors a directory for new input files by polling the directory every few seconds. New files may often be several megabytes, and so take some time to fully arrive in the input directory (eg: on copy from a remote share). Is there a simple way to detect whether a file is currently in the process of being copied? Ideally any method would be platform and filesystem agnostic, but failing that specific strategies might be required for different platforms. I've already considered taking two directory listings separaetd by a few seconds and comparing file sizes, but

I am willing to implement a chat website on App Engine. But I found that App Engine will not allow me to go with server push. (as it will kill the response after 30 sec). So whats the other method that can be used? Will polling cause bad user experience? Meaning will the user have to wait for some time to retrieve new messages from the server? What will be the ideal polling interval? If you use very small polling intervals, will my bandwidth get exhausted? Will I suffer performance problems? This is a quite old question now, but I was looking for a similar answer. I think the Channel API (

I am attempting to write a program in MIPS that uses polling to read a character from the keyboard and then displays it using the builtin Keyboard and Display MMIO Simulator. Unfortunately, I am having trouble grasping the concept behind the registers used and the control bits, but have been trying to figure it out from examples online. Here is what I have written so far: .data .text .globl main main: .eqv RCR 0xffff0000 # Receiver Control Register (Ready Bit) .eqv RDR 0xffff0004 # Receiver Data Register (Key Pressed - ASCII) .eqv TCR 0xffff0008 # Transmitter Control Register (Ready Bit) .eqv