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[Process-Thread] multitreadsrc4 DL : 0: 线程的同步　　虽然多线程能给我们带来好处，但是也有不少问题需要解决。例如，对于像磁盘驱动器这样独占性系统资源，由于线程可以执行进程的任何代码段，且线程的运行是由系统调度自动完成的，具有一定的不确定性，因此就有可能出现两个线程同时对磁盘驱动器进行操作，从而出现操作错误；又例如，对于银行系统的计算机来说，可能使用一个线程来更新其用户数据库，而用另外一个线程来读取数据库以响应储户的需要，极有可能读数据库的线程读取的是未完全更新的数据库，因为可能在读的时候只有一部分数据被更新过。-thread synchronization Although multithreading can bring us benefits, but there a lso many problems to be solved. For example, as disk drives such exclusivity system resources and can thread the process of implementation of any code, and the thread running by the scheduling system automatically and to a certain extent the uncertainty, So, then there could be two threads while the disk drives operate, which have operational errors; For example, For the computer banking system, may use a thread to update users of its database, and use another thread to read a database to respond to the needs of depositors, Reading is very likely to read threads database is not fully update the database, Reading may be because the time was only part of the updated data.
Date : 2008-10-13 Size : 22.25kb User : 苏艳芳
[Process-Thread] scan与cscan算法模拟磁盘调度实验 DL : 0: 此为操作系统实验报告： scan,cscan算法模拟磁盘调度内含：程序流程图设计思路主要源码等等。简介：磁盘是一种高速、大容量、旋转型、可直接存取的存储设备。它作为计算机系统的辅助存储器，担负着繁重的输入输出任务、在多道程序设计系统中，往往同时会有若干个要求访问磁盘的输入输出请求等待处理。系统可采用一种策略，尽可能按最佳次序执行要求访问磁盘的诸输入输出请求。-operating system for this experiment : scan, cscan scheduling algorithm simulation disk containing : flowchart design major source so on. Description : disk is a high-speed, high-capacity, rotating type, direct access storage devices. As computer systems support memory, shoulders the heavy task of input and output, multiple procedures in the system design, while there are often a number of requests to visit disk input and output requests pending.
Date : 2008-10-13 Size : 6.67kb User : 何浩
[Process-Thread] scan与cscan算法模拟磁盘调度实验 DL : 0: 此为操作系统实验报告： scan,cscan算法模拟磁盘调度内含：程序流程图设计思路主要源码等等。简介：磁盘是一种高速、大容量、旋转型、可直接存取的存储设备。它作为计算机系统的辅助存储器，担负着繁重的输入输出任务、在多道程序设计系统中，往往同时会有若干个要求访问磁盘的输入输出请求等待处理。系统可采用一种策略，尽可能按最佳次序执行要求访问磁盘的诸输入输出请求。-operating system for this experiment : scan, cscan scheduling algorithm simulation disk containing : flowchart design major source so on. Description : disk is a high-speed, high-capacity, rotating type, direct access storage devices. As computer systems support memory, shoulders the heavy task of input and output, multiple procedures in the system design, while there are often a number of requests to visit disk input and output requests pending.
Date : 2025-12-29 Size : 6kb User : 何浩
[Process-Thread] multitreadsrc4 DL : 0: 线程的同步　　虽然多线程能给我们带来好处，但是也有不少问题需要解决。例如，对于像磁盘驱动器这样独占性系统资源，由于线程可以执行进程的任何代码段，且线程的运行是由系统调度自动完成的，具有一定的不确定性，因此就有可能出现两个线程同时对磁盘驱动器进行操作，从而出现操作错误；又例如，对于银行系统的计算机来说，可能使用一个线程来更新其用户数据库，而用另外一个线程来读取数据库以响应储户的需要，极有可能读数据库的线程读取的是未完全更新的数据库，因为可能在读的时候只有一部分数据被更新过。-thread synchronization Although multithreading can bring us benefits, but there a lso many problems to be solved. For example, as disk drives such exclusivity system resources and can thread the process of implementation of any code, and the thread running by the scheduling system automatically and to a certain extent the uncertainty, So, then there could be two threads while the disk drives operate, which have operational errors; For example, For the computer banking system, may use a thread to update users of its database, and use another thread to read a database to respond to the needs of depositors, Reading is very likely to read threads database is not fully update the database, Reading may be because the time was only part of the updated data.
Date : 2025-12-29 Size : 22kb User : 苏艳芳
[Process-Thread] sc DL : 0: 编程序实现下述磁盘调度算法,并求出每种算法的平均寻道长度-Programmed to achieve the following disk scheduling algorithm, and calculated for each algorithm the average seek length
Date : 2025-12-29 Size : 2kb User : 王海
[Process-Thread] mos DL : 0: MOS是一个批处理系统，它经由键盘接纳由软件模拟的计算机的指令及可使用MOS某些功能的系统调用书写的用户作业，在打印机上输出作业运行结果。该系统提供多个作业并行处理的功能，作业的输入/输出采用SPOLING技术，所要管理的外设是键盘、磁盘、打印机。故MOS的设计者和实现者要处理/输出、中断、进程调度、作业调度、内外存管理和设备管理-MOS is a batch processing system, which is accepted by the software via the keyboard of the computer simulation of command and may use certain features of the MOS system call to write the user operation, the printer output operating results. The system provides a wide range of operating parallel processing capabilities, operating the input/output using SPOLING technology to the management of peripherals is a keyboard, disk, printer. Therefore, the designers of MOS and the achievement of those who want to deal with I/O, interrupt, process scheduling, job scheduling, internal and external deposit management and equipment management
Date : 2025-12-29 Size : 119kb User : 吴京土
[Process-Thread] cipandiaodu DL : 0: 1、对于如下给定的一组磁盘访问进行调度：请求服务到达 A B C D E F G H I J K 访问的磁道号 30 50 100 180 20 90 150 70 80 10 160 2、要求分别采用先来先服务、最短寻道优先以及电梯调度方法进行调度。 3、要求给出每种算法中磁盘访问的顺序，计算出平均移动道数。 4、假定当前读写头在90号，向磁道号增加的方向移动。-1, for a given set of as disk access scheduling: Request service ABCDEFGHIJK access track to reach No. 30 50 100 1,802,090,150,708,010,160 2, the requests were a first-come, first served, shortest seek first, and elevator scheduling method of scheduling. 3, the algorithm required to give each disk access order to calculate the average number of mobile channel. 4, assuming that the current read-write head 90 to move the direction of increasing track number.
Date : 2025-12-29 Size : 1.16mb User : 刘莹
[Process-Thread] cipandiaodusuanfa DL : 0: 磁盘驱动调度对磁盘的效率有重要影响。磁盘驱动调度算法的好坏直接影响辅助存储器的效率，从而影响计算机系统的整体效率。常用的磁盘驱动调度算法有：最简单的磁盘驱动调度算法是先入先出（FIFO）法。这种算法的实质是，总是严格按时间顺序对磁盘请求予以处理。算法实现简单、易于理解并且相对公平，不会发生进程饿死现象。但该算法可能会移动的柱面数较多并且会经常更换移动方向，效率有待提高。-Disk drive scheduling efficiency of the disk have a major impact. Disk drive scheduling algorithm will have a direct impact on the efficiency of secondary storage, thus affecting the overall efficiency of the computer system. Commonly used in disk drive scheduling algorithms are: simple disk drive scheduling algorithm is first in first out (FIFO) method. The essence of this algorithm always strictly chronological order of the disk requests to be addressed. Algorithm is simple, easy to understand and relatively fair, the process of starvation phenomenon does not occur. However, the algorithm is the number of cylinders may be more mobile and will often change the direction of movement, efficiency to be improved.
Date : 2025-12-29 Size : 10kb User : 阿门