Realizing method of adjustable-speed timer in Windows operation system environment

Abstract

The invention discloses a realizing method of an adjustable speed timer in the Windows operation system environment. The method comprises that an APIC timer is selected to provide an user state interface; the user state interface is packaged, wherein adjustable-speed function and time correlation function interface are packaged to a dynamic linkbase used for application procedures of the Windows operating system; the application procedures load the dynamic linkbase to realize the call of the user state interface; the user state interface is called, and the adjusted APIC timer is inducted to the inner core; the adjusted APIC timer cycle is assigned to an initial counter register to realize cycle adjustment of the APIC timer cycle. According to the invention, the dynamic adjustment of the timer time interval is completed, time span proportional relations between the timer time interval and a real system are changed, the adjustable function of the timer is realized, the single rate problem of the timer is resolved, and the application requirements of the Windows program in different environments are met.

Description

technical field [0001] The invention relates to the technical field of interrupt processing, high-precision timing and system software development of Windows operating system. More specifically, the present invention relates to a method for realizing a high-precision and adjustable-speed timer by using an APIC (Advanced Programmable Interrupt Controller) timer under the Windows operating system environment. Background technique [0002] The Windows operating system provides users with three types of timers: WM_TIMER message timer, multimedia clock timer and high-precision clock timer. [0003] 1) WM_TIMER timer: WM_TIMER timer is the most basic timer of Windows, which is created and set interval by SetTimer(), and then destroyed by KillTimer(). After WM_TIMER is created, WM_TIMER messages will be sent to the specified thread regularly, and added to the message queue for processing. The WM_TIMER timer message is a low-priority message, and the WM_TIMER message will only be ...

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Problems solved by technology

[0008] Still another object of the present invention is to provide a method for realizing an adjustable-speed timer under the Windows operating system environment, which uses an APIC timer device to generate a clock signal of hundreds of microseconds in a Windows-driven manner, and achieves the highest precision. It is a high-precision timer of 100 microseconds; by modifying the value in the initial count register (initial count register) of the APIC timer at runtime, the dynamic adjustment of the timer interval is completed, and the timer interval and the real system time are changed The proportional relationship between spans realizes the adjustable speed function of the timer, solves the problem that the existing Windows system timer cannot be adjusted, solves the problem of fixed function and single speed of the system timer, and meets the needs of Windows programs in different environments. Application requirements

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