Home > Backend Development > C++ > Why Is Precise Sub-Millisecond Sleep Difficult to Achieve on Windows?

Why Is Precise Sub-Millisecond Sleep Difficult to Achieve on Windows?

Susan Sarandon
Release: 2024-12-06 11:15:17
Original
725 people have browsed it

Why Is Precise Sub-Millisecond Sleep Difficult to Achieve on Windows?

Sleep Duration Precision on Windows

On Windows systems, precise sleep durations below one millisecond can be challenging to achieve. The only available sleep function, Sleep, operates with millisecond granularity. This limitation contrasts with Unix systems, which offer multiple options such as sleep, usleep, and nanosleep for more refined sleep control.

One common approach to achieving microsecond sleep on Unix involves the select system call. However, this method proves ineffective on Windows. The reason lies in the nature of sleep functions. The specified parameter represents a minimum sleep duration, not a guaranteed one. The thread may not awaken precisely as requested.

Threads do not inherently "wake up" at a specific time but are rather scheduled for execution by the operating system. The scheduler may choose to exceed the requested sleep duration, particularly if other threads remain active during that interval. Therefore, the notion of precise sleep durations below a millisecond on Windows is often impractical.

The above is the detailed content of Why Is Precise Sub-Millisecond Sleep Difficult to Achieve on Windows?. For more information, please follow other related articles on the PHP Chinese website!

source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Latest Articles by Author
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template