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In computer science and software engineering, busy-waiting, busy-looping or spinning is a technique in which a process repeatedly checks to see if a condition is true, such as whether keyboard input or a lock is available. Spinning can also be used to generate an arbitrary time delay, a technique that was necessary on systems that lacked a method of waiting a specific length of time. Processor speeds vary greatly from computer to computer, especially as some processors are designed to dynamically adjust speed based on current workload. Consequently spinning as a time-delay technique can produce unpredictable or even inconsistent results on different systems unless code is included to determine the time a processor takes to execute a 'do nothing' loop, or the looping code explicitly checks a real-time clock. In most cases spinning is considered an anti-pattern and should be avoided, as processor time that could be used to execute a different task is instead wasted on useless activity. Spinning can be a valid strategy in certain circumstances, most notably in the implementation of spinlocks within operating systems designed to run on SMP systems. Example C code The following C code examples illustrate two threads that share a global integer i. The first thread uses busy-waiting to check for a change in the value of i:In a use case like this, one can consider using C11's condition variables. Alternatives Most operating systems and threading libraries provide a variety of system calls that will block the process on an event, such as lock acquisition, timer changes, I/O availability or signals. Using such calls generally produces the simplest, most efficient, fair, and race-free result.

This GIF Bitmap Image Busy Smiley GIF Free Photo is a part of Busy Smileys Category in Emoji Folder. Busy Smiley GIF Free Photo has a Resolution of 35x21 Pixels. Busy Smiley GIF Free Photo is of .gif (Graphics Interchange Format) Format. It's Size is 3.6KB. This GIF has been Downloaded 50 times till now. Busy Smiley GIF Free Photo was Added on 26-09-2021. Download Busy Smiley GIF Free Photo by clicking the button below:

Image Name: Busy Smiley GIF Free Photo
Image Category: Emoji / Busy Smileys
Date Added: 26-09-2021
Resolution: 35x21

Format: GIF
Downloads: 50
Views: 111
Size: 3.6KB

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