Scheduling method for built-in tasks of synchronous digital system devices
A technology of synchronous digital system and scheduling method, which is applied in the field of optical transmission, can solve problems such as the inability to guarantee the time of task scheduling, the system cannot operate normally, and tasks cannot be executed in time, so as to achieve the effect of ensuring execution time and real-time performance
Inactive Publication Date: 2008-03-19
NANJING ZHONGXING XIN SOFTWARE CO LTD
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Problems solved by technology
If the periodic tasks and the relationship with other tasks are not selected properly, the entire system will not function properly
[0006] If an absolute timer is used, it can be seen from Figure 1 that while the function under the timer is executed, the timer count will start at the same time as the function is executed, then when the function code is executed, the remaining time will be For other tasks to execute, this period of time will not be a timing period, its length is the timing period minus the execution time of the function block, so that the time for other tasks to be scheduled is determined by the execution time of the function block in the periodic task. It cannot guarantee the scheduling time of other tasks
May cause other tasks to not be executed in time and cause problems
Method used
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[0018] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not used to limit the present invention.
[0019] In this embodiment, in order to maximize the use of CPU resources, the periodically executed functions with high real-time requirements are hung under the high-priority relative timers, so that the real-time performance of this function can be guaranteed because of the high priority. Level timers can be timed in real time, and when the time is up, the function blocks hanging below can be scheduled; at the same time, the feature of the relative timer is that the function blocks hanging below are restarted after the execution of the function blocks below are completed, and the timing is restarted, so it is executed in the function block. During the process, the relative ...
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The dispatching method according to the invention for embedded tasks of a synchronous digital system includes the following steps: establishing a relative timer with predetermined timing period; hanging the tasks under the timer; and repeating processes of timing with the relative timer and performing the hanged tasks in sequence. With the invention, resource of the whole CPU is furthermost used, real-time performance of the periodic functional module is ensured, and execution time of other task dispatching is ensured without being influenced by execution time of code of the timer.
Description
Technical field [0001] The invention relates to the field of optical transmission, and proposes a scheduling of embedded software application tasks for synchronous digital hierarchy (SDH) equipment. Background technique [0002] With the continuous development of the entire communication field, people have higher and higher requirements for the reliability and operational efficiency of communication equipment, and they are also required to be cheaper and cheaper. Therefore, high requirements are put forward for the cost control of communication equipment. Communication equipment under certain cost control provides limited resources for embedded software, such as CPU resources, but with the increasing popularity and promotion of communication equipment, there will be more and more functions. How to make full use of existing resources , Will become an important subject. [0003] For SDH equipment, which is at the bottom of the entire communication link, its importance, reliability,...
Claims
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IPC IPC(8): H04Q11/04H04J3/16
Inventor 刘林
Owner NANJING ZHONGXING XIN SOFTWARE CO LTD