educative io system design

Next: "Architecture design: Inter-system Communication (4)--io communication model and Java Practice Medium", we continue to explain asynchronous IO7. Asynchronous IOIn the previous two articles, we explained the three IO models for blocking synchronous IO, non-blocking sync

To design the "Network hard disk" function, you must first familiarize yourself with the operations for processing files and folders in. net. File and directory are the two most important classes. Understanding them will greatly facilitate the implementation of subsequent functions. System. Io. File and system.

High-performance IO Design Mode: blocking/non-blocking, synchronous/asynchronous parsing, io Design Mode When it comes to high performance, I think everyone like this. Today we will mainly understand several key concepts in high performance I/O design, the most important fir

I. I/O portA port is the address of a register in an interface circuit that can be accessed directly by the CPU. Almost every peripheral is made from a register on a read-write device. The CPU sends commands to the registers in the interface circuit through these addresses, namely ports, to read the status and transmit the data. Peripheral registers, also known as "I/O ports", typically include: control registers, status registers, and data registers, and the registers of a peripheral are usuall

In the high-performance I/O design, there are two well-known modes reactor and Proactor modes, where reactor mode is used for synchronous I/O, and Proactor is used for asynchronous I/O operations. Before comparing these two patterns, we first understand a few concepts, what is blocking and non-blocking, what is synchronous and asynchronous, synchronous and asynchronous are for application and kernel interaction , Synchronization refers to the user pr

skipspaceoutputstream.* @ Author magic**/Public class test {Public static void main (string [] ARGs ){Byte [] buffer = new byte [1024];/*** Create input stream from the standard input.*/Inputstream in = new bufferedinputstream (New datainputstream (system. In ));/*** Write to the standard output.*/Outputstream out = new skipspaceoutputstream (New dataoutputstream (system. Out ));Try {

In High-performance I/O design, there are two well-known patterns reactor and Proactor modes, where the reactor mode is used to synchronize I/O, while Proactor is applied to asynchronous I/O operations. Before you compare these two patterns, we first understand a few concepts, what is blocking and non-blocking, what is synchronous and asynchronous, synchronous and asynchronous are for application and kernel interaction, synchronization refers to the

OS = 0;} if (countSecond, decorative design modeWhen the function of a group of objects is enhanced, you can use this mode to solve problems, the above-mentioned custom Mybufferedreader class is very good embodiment, for the FileReader analogy original function is simple, of course, the above code is relatively simple to writeClass room{public void Show () {System.out.println ("House");}} Class Newroom {private Or;public newroom (Oldroom or) {//TODO

starting address of the user space and is generally specified as NULL, so that the task that selects the start address is done by the kernel, and the return value of the function is the address mapped to the user space. Its type caddr_t is actually void *. */When the user calls Mmap (), the kernel will handle the following.① finds a piece of VMA in the virtual space of the process.② the VMA to the map.③ if the device driver or the file_operations of the file

IO dispatch routine runs on passive_level, And the DPC that pulls an IRP from the IRP pair to process runs on dispatch_level, in this way, no dispatch routine will disturb an IRP operation, saving the lock operation. In a hardware interruption, CPU running at the hardware interruption priority puts a DPC into this CPU pair column. After the interruption is completed, the CPU is downgraded to the dispatch_level priority, and the DPC can be executed...

Design and Development of efficient asynchronous Io From: http://hippoweilin.mobile.spaces.live.com/arc.aspx In my understanding, efficient asynchronous Io should not only achieve the efficiency of program running, but also the efficiency of development, which also includes quality, for many people who have never done asynchronous

void write (byte B [], int off, int Len) throwsIoexception { If (LEN> = Buf. Length ){ Flushbuffer (); Out. Write (B, off, Len ); Return; } If (LEN> Buf. Length-count ){ Flushbuffer (); } System. arraycopy (B, off, Buf, Count, Len ); Count + = Len; } Public synchronized void flush () throws ioexception { Flushbuffer (); Out. Flush (); } } The bufferedoutputstream class provides the specific implementation of flush () and write (INT), which is the spe

JAVA learning lesson 49th-IO stream (III): Buffer Zone 2 amp; Decoration Design Mode I. Simulate BufferedReader Custom MyBuffereaReader In the buffer zone, an array is encapsulated to provide external methods for Array Operations. These methods ultimately operate on the array badge. Principle: extract data from the source and store it in the buffer zone. After the data is obtained, the

Io SubsystemThe IO System of nebula3 is a huge improvement compared with Nebula1 and 2. The main design objectives of the new system are as follows: Use a more standard mechanism, such as URI to locate resources, and Mime Type to differentiate data formats A flexible stre

This article was reproduced from: http://blog.csdn.net/kidd_3/article/details/6909097Technorati Tags: I/O subsystem--------------------------------Split Line Start-------------------------------- Our analysis is based on the 2.6.32 and its subsequent kernels. We always keep the data on Linux, and the data is either stored in the file system (e.g. ext3) or stored in a bare device. When we use this data, we access it through the abstraction of the file,

IO design mode: Reactor vs. ProactorOpen source products such as Redis, ACE, and event model are used in the reactor mode, while the same event handling proactor, due to operating system reasons, the relevant open source products are also few; here to learn its model structure, the focus of comparison between the two similarities and differences;Reactor Reactorre

operation.(3) DMA: No direct data exchange via CPU, memory and IO devices.5. Design of IO SoftwareLayered design ideas.The bottom layer is the control and operation of the hardware. The upper level is the logical operation.(1) User-level IO software: The user performs input

"Creating a good input/output system is a very difficult task for Language designers ." Because there are a lot of different design schemes, the difficulty of this task is easily proved. The biggest challenge seems to be how to cover all possible factors. There are not only three different types of Io to consider (file, console, network connection ), in addit

No matter what language you learn, you will inevitably have access to the file system, often with documents. Java of course is no exception, some netizens feel IO design is very cumbersome, sometimes I also have this feeling, its practical proficiency, it is very convenient to think this thing. Before introducing Java IO