task n. 1.(派定的)工作,任务,功课。 2.艰苦的工作,苦差使。 3.〔废语〕租税,税款。 set (sb.) a task 派(某人)一个任务。 be at one's task 在做着工作。 It's quite a task to figure out 10 problems in an hour. 一小时内算出十道习题可是个艰苦的工作。 bring [call, take] sb. to task (for doing sth.) (为…)责备(某人)。 take a task upon oneself 接受任务。 vt. 1.派给工作。 2.虐待,使作苦工。 3.〔废语〕课税。 task one's energies 尽全力。 taskbar 【计算机】(通常显示于电脑屏幕底部的)任务栏。
Then , considering cons and pros of ds and pm protocols , this thesis proposed a new task synchronization protocol called ds / pm protocol . this new protocol can solve part of problems in previouse two protocols . finally , this thesis proposed a task tranaction worst - case response time analysis algorithm for ds / pm protocol and made performance estimation for these algorithms 其次,本文根据ds和pm方式各自的优缺点,提出了一种ds与pm方式相结合的ds pm任务同步控制方式,这种同步控制方式能部分弥补ds和pm方式的缺点,而后基于该方式提出了相应的任务序列最大响应时间分析算法。
In the schedulability analysis of such system , firstly we should account for the overhead of message communication between tasks . secondly , we should account for the influence of different task synchronization protocols to schedulability analysis algorithm . lastly , worst - case response time of all the tasks and messages in the system should be analyzed holisticly because they are inter - dependent 首先,需要考虑任务间的消息通讯带来的时间开销;其次,需要考虑不同的任务同步控制方式对可调度性分析算法以及任务模型造成的影响;最后,由于系统中任务和消息具有复杂的关联关系,还要对系统中所有任务、消息的最大响应时间进行整体分析,从而得到任务序列的最大响应时间。
The paper descibes a few key techniques of the embedded software design that based on the embedded operating system . embedded operating system is the soul of the embedded system , its function is to schedule , manage and control tasks , manage the inter - task communication , task synchronization and mutex , manage system resources . the embedded operating system is not suitable for common use because of the specific application of embedded system , and it has characters of itself 嵌入式操作系统是嵌入式应用系统的灵魂,它担负着任务调度、任务控制、任务间通信与同步、资源管理、存储管理等重要任务,但嵌入式应用系统的专用性决定了嵌入式操作系统的通用性是非常低的,为了片面追求其通用性,结果往往是嵌入式操作系统的性能不能满足应用的需要。
Finally , this thesis proposed a message worst - case response time analysis algorithm for a simplified task model and made performance estimation for these algorithms . in the research of the second part , after a brief introduction of ds ( direct synchronization ) and pm ( phase modification ) task synchronization protocols , this thesis proposed the task transaction worst - case response time analysis algorithm respectively 在第二部分的研究中,首先分别针对ds ( directsynchronization ) 、 pm ( phasemodification )两种任务同步控制方式提出了相应的任务序列最大响应时间分析算法,对原有算法进行了改进,并按照holistic算法的思想提出了相应的计算迭代方程组。
Our research in this thesis is divided into two parts . in the first part , our main goal is to derive the overhead of messages communications in distributed real - time systems . in the second part , according to different task synchronization protocols , we derive task transaction worst - case response time analysis algorithms respectively 第二部分是在综合考虑各任务和消息的响应时间以及不同的任务同步控制方式的基础上对任务序列的最大响应时间进行分析研究,并提出相应的分析算法。