Mixed task set dispatching method based on VxWorks operation system

An operating system and scheduling method technology, applied in the computer field, can solve problems such as low real-time performance, low CPU utilization, and large computational load, and achieve the effects of improving utilization, improving real-time performance, and reducing response time.

Inactive Publication Date: 2009-12-23
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the low real-time performance of the above-mentioned existing scheduling method, large amount of calculation, and low CPU utilization, and provide a scheduling method for mixed task sets based on the VxWorks operating system, so as to improve CPU utilization and reduce scheduling errors. Response time during periodic tasks to improve system real-time performance

Method used

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  • Mixed task set dispatching method based on VxWorks operation system
  • Mixed task set dispatching method based on VxWorks operation system
  • Mixed task set dispatching method based on VxWorks operation system

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Embodiment Construction

[0029] The specific implementation manner of the present invention will be described in detail below in conjunction with the accompanying drawings and program pseudo codes.

[0030] In a specific implementation, the pseudocode of the special periodic task used is:

[0031] void Special task

[0032] {

[0033] while(1)

[0034] {

[0035] taskDelay(periodT);

[0036] if(...)

[0037] {

[0038] semGive(semId[1]);

[0039] }

[0040] else semGive(semIdT);

[0041] semTake(semIdT, WAIT_FOREVER);

[0042] if(...)

[0043] {

[0044] semGive(semId[2]);

[0045]}

[0046] else semGive(semIdT);

[0047] semTake(semIdT, WAIT_FOREVER);

[0048]  …; / *other cases* /

[0049] }

[0050]}

[0051] see figure 1 , the implementation steps of the present invention are as follows:

[0052] Step 1, create a ta...

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Abstract

The invention discloses a mixed task set dispatching method based on a VxWorks operation system, mainly solving the problems of poor non-periodic task instantaneity and low CPU utilization ratio in a plurality of mixed dispatching methods. The method comprises the following steps: creating a mixed task set and a special periodic task and creating a semaphore for the special periodic task; judging the dispatching performance of the mixed task set by an improved time-demand algorithm before carrying out task dispatch; dispatching the periodic task according to a preemptive dispatching algorithm based on a priority level and supplied by VxWorks; sequentially judging the running condition of a non-periodic task in the running process of the special periodic task; if the running condition of a non-periodic task is met, releasing the corresponding semaphore to run the non-periodic task; and releasing the semaphore after running the non-periodic task to run the special periodic task. The invention improves the utilization ratio of a CPU, reduces the response time when the non-periodic task is dispatched, and can be used for dispatching the mixed task set with more non-periodic tasks.

Description

technical field [0001] The invention belongs to the field of computers and relates to a task scheduling method of a real-time operating system, in particular to a VxWorks-based mixed task set scheduling method. Background technique [0002] VxWorks is an industry-leading high-performance real-time operating system developed by WindRiver Corporation of the United States, and it is also one of the most distinctive operating systems among all processor-independent real-time systems today. [0003] Two classic scheduling methods are Rate-Monotonic-RM algorithm and Earliest Deadline First-EDF algorithm proposed by Liu C L and Layland J in 1973, referring to C L Liu, J W Layland.Scheduling Algorithms for Multiprogramming in a Hard Real-TimeEnvironment[J ]. Journal of the Association for Computing Machinery, 1973, 20(1): 116-128. The RM algorithm has low CPU utilization and is only applicable to periodic task sets. The EDF algorithm has a large running cost and does not take into...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F9/48
Inventor 相征万娟汤书苑苑峰任鹏赵楠
Owner XIDIAN UNIV
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