operating system questions and answers

POSIX (interface with portable operating system) threads are a powerful means to improve code response and performance. In this series, Daniel Robbins precisely shows you how to use threads in programming. It also involves a lot of background details. After reading this series of articles, you can use POSIX Threads to create multi-threaded programs. Threads are interesting Understanding how to corre

; Enter the South bridge chip oral,00000010b; Open the 2nd bit of the South Bridge chip (A20 control bit) out 0x92,al; Send the modified configuration back to the South bridge chipHere's another way, not using the 8042 keyboard controller, the note has been said, and, this code to run under the privilege level of RING0, if you want to continue to operate later, require JMP instructions and enter the protection mode, we will introduce in the next article into the protection mode.If you have any

In many cases, processes need to communicate with other processes. For example, the pipe command in shell: ps-ef | grep nginx, the output of one command, as the input of another process, is Interprocess Communication ).Inter-process communication mainly needs to solve three problems:1. How does one process transmit information to another process?2. How to prevent mutual interference and obstruction between processes3. What should I do when there is a dependency between processes.Although the com

above data, analysis of the advantages and disadvantages of the algorithm.Four, Experiment Preparation Serial number Prepare content Complete situation 1 What is a job? 2 What information does a job have? 3 In order to facilitate the simulation of the scheduling process, what kind of data structure is used to store and represent the job? JCB 4 What are the commonly used job sche

Even if Edge plans to end with a failure, Ubuntu's determination to enter the mobile field without interruption. A few days ago, Ubuntu developer Canonical announced that it will not only release Ubuntu14.04, which will be further adapted to mobile devices, but has negotiated with four large mobile phone manufacturers rdquo, it is expected that Ubuntu mobile phones will be available next year. But there are indications that the Linux-based operating

; initrd/isolinux/initrd.img [linux-initrd @ 0x3daa9000,0x1bd657d Bytes]bootEnter the installation mode, after the installation language is selected, select Installation Method; choose hard Driver; then select/DEV/SDA4. You can enter the installation. Install configuration and selection according to this website;Http://jingyan.baidu.com/article/c74d600051b57b0f6a595dca.html7, after installation, restart, select the CentOS 6.2,grub will take the initiative to help you find the

above data, analysis of the advantages and disadvantages of the algorithm.Four, Experiment Preparation Serial number Prepare content Complete situation 1 What is a job? 2 What information does a job have? 3 In order to facilitate the simulation of the scheduling process, what kind of data structure is used to store and represent the job? JCB 4 What are the commonly used job sche

In this section, we will learn an important feature of modern operating systems-the interrupt handling mechanism. In the same way, the interrupt processing is also the hardware and software co-operation, in which part: 8259A is responsible for the programmable interrupt controller, through the read-write port, to achieve interrupt signal and interrupt number of the binding, etc. the CPU through the gate descriptor and interrupt vector table to impleme

://images.cnitblog.com/blog2015/157572/201504/130948229324459.png "style=" border:0 px; "/> Erichu Source:http://www.cnblogs.com/huyong/Email:[email protected]QQ Communication:406590790about senior engineer, information System Project Manager, DBA. Focused on Microsoft platform Project architecture, management and enterprise solutions, multi-year project development and management experience, has organized and developed several large projects, in the

].usetime++; }}voidArrivesort (structPCB pcbs[Ten],intN) { intI=0; Chartemp[Ten]; intmin; for(i=0; i1; i++) { if(pcbs[i].arrivetime>pcbs[i+1].arrivetime) {min=Pcbs[i].arrivetime; Pcbs[i].arrivetime=pcbs[i+1].arrivetime; Pcbs[i+1].arrivetime=min; Min=Pcbs[i].needtime; Pcbs[i].needtime=pcbs[i+1].needtime; Pcbs[i+1].needtime=min; Min=pcbs[i].priority; Pcbs[i].priority=pcbs[i+1].priority; Pcbs[i+1].priority=min; strcpy (Temp,pcbs[i].name); strcpy (Pcbs[i].name,pcbs[i+1]

SSH locally [email protected] ' ls/local ' will execute the ls/local command on the remote machine, and if you want to execute multiple commands on a remote machine consecutively, you can enclose the commands in single or double quotes.For example: SSH [email protected] ' cd/local; Pwd;ls 'If you want to start a command on a remote machine locally and return it, you can ssh [email protected] "/local/x.sh 1>/dev/null 2>1 "Note If there is no "", such as ssh [email protected] cd/local; LS will on

Process SynchronizationAs mentioned above, the collaboration process affects other processes, that is, it shares the logical address space, that is, the shared memory system. In this case, it is very likely that an error will occur when accessing the same variable at the same time. There is also an independent process that will not be affected. The messaging collaboration process does not cause synchronization issues. Therefore, this chapter discusses

Test the linux operating system-general Linux technology-Linux technology and application information. For details, refer to the following section. I found that the red union rarely mentioned linux-related testing issues. I have many questions about testing. I will discuss them here: 1. I don't know how each linux operating