Linux user mode based method and system for calling timer

Abstract

The present invention discloses a linux user mode based method and system for calling a timer. The method comprises: applying for an 8-byte consecutive memory by means of kmalloc in a kernel, and returning a head virtual address kmem of the memory; converting the virtual address kmem to a physical address kphy by means of _pa; enabling a user mode to acquire the physical address kphy from a kernel mode by means of ioctl; converting the physical address kphy to a virtual address umem, used for accessing a user mode address; defining a global variable jiffies in the kernel mode and writing the global variable into the virtual address kmem; enabling the user mode to create an infinite loop thread for performing a while (1), acquiring a value of the jiffies, and acquiring a system time by means of the value of the jiffies; and comparing and determining the system time and a locally stored last time, and calling a user mode timer to process a timer task. Thus, system calling is reduced, and system performance and efficiency are improved.

Description

technical field [0001] The present invention relates to the field of computers, in particular to a method and system for invoking a timer based on linux user state Background technique [0002] In the field of computer technology, timer is a common and necessary technology. It is a collection of a series of functions. By using the methods provided by it, the software can complete the specified function within a fixed time. Automatically execute certain operations or tasks within a certain time. At present, timers are used in many application systems or application platforms to complete periodic tasks or task execution at specific times, such as realizing automatic control, timing state switching or delaying Time processing and other functions. [0003] The linux kernel mode has its own timer, which can obtain the system time of the kernel and the corresponding task scheduling, but currently the user mode does not have a user mode own timer that is synchronized with the kern...

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Problems solved by technology

[0004] However, the above-mentioned user-added timer function through the kernel timer will generate system calls. If the system calls frequently or the user mode adds too many timers, the performance and efficiency of the entire system will be reduced.

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