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硕士论文-对VxWorks中内存管理和定时器模块的改进，正文共67页。
【摘要】 随着嵌入式系统越来越复杂,数据处理量成几何级增长,尤其在航空航天、工业控制、医疗、通讯等重要领域中,嵌入式系统的实时性和可靠性就显得尤为重要。本文基于嵌入式VxWorks在精确定时器和内存管理实时性方面的不足,进而提出了新的想法和改进。在精确定时器模块方面,通常采用的定时方法比较粗糙,不能提供毫秒级定时,满足不了用户的需求。针对以上需求,本文提出了一种高效、精确、毫秒级定时器的设计方法。该设计方法使用了系统的辅助时钟,通过设计巧妙的遍历方法,来极大的节省了时间,确保了计时器的实时性和准确性。在内存管理模块方面,本文提出了一种新的适用于VxWorks系统的内存管理方案——可调整的内存管理算法,通过引入新的顺序物理链表,统计量等方法,重点就如何减少外部内存碎片、如何快速实现内存分配、如何快速释放回收、以及如何提高内存利用率,提出了新的构想与实现。
【Abstract】 With the increasing in complexity of embedded systems, and geometric growth in data processing capacity, espesailly in aerospace, industrial control, medical, communications, and other important areas, the real-time and reliability is particularly important in embedded systems.This paper analyzes the VxWorks embedded system in the precision timer and memory management, providing some new ideas and improvement.In the timer module, the old methods which can not provide the level of milliseconds, can not meet the needs of users. For more than demand, a design of timer is provided, which is highly efficient, accurate and millisecond in precision timer module. The design uses the system auxiliary clock, through the clever design of the new traversal methods to save a great deal of time to ensure that the timer of real-time.In the memory management module, a new memory management applies to VxWorks named Adjustable Memory Management. Through the introduction of a new ordered list, statistical value and so on, we focus on how to reduce the external memory fragmentation, how to allocate memory fast, how to release fast, as well as how to improve the utilization of memory. A new concept and realization comes out.
【关键词】 VxWorks； 毫秒级定时器； 可调整内存管理；
【Key words】 VxWorks； ms-timer； Adjustable Memory Management；