real time operating system

Solve_fork1 () {while (lock==1) {} cnt++; printf ("%d has entered the critical section \ n", Getpid ()); lock = 1; } void Solve_fork2 () {while (lock = = 0) {} cnt++; printf ("%d has entered the critical section \ n", Getpid ()); lock = 0; } The above is achieved mutex access is not wrong, but also problematic, first of all, he was busy to solve the problem, and secondly, he can solve two of the process of competition. Peterson SolutionThe result of the solution

completion time of each job, the turnaround time and the turnaround time (turnover factor).2. Dynamic demonstration of each scheduling, update the current system time, in the running state and waiting for the corresponding information of each job (job name, arrival

Add a root user for the ubuntu operating system and a root user for the ubuntu Operating System 1: After a virtual machine is installed and the Ubuntu operating system is installed, you can log on to the

Operating system --- learning notes 0, operating system --- learning notes Note: This document follows the "Netease cloud classroom"-Harbin Institute of Technology-instructor Li Zhijun's Open Class course. I would like to thank Mr. Li for his busy schedule to provide excellent teaching resources for the majority of stu

Operating System-webpage storage management and operating system storage When talking about page-based storage management, I would like to talk about the user's program first, because page-based storage management serves the user's program or processes. After a program is compiled, it will definitely occupy space, that

This section first introduced the breakthrough boot sector only 512 bytes of the principle, and then introduced the FAT12 file system, finally through the experiment Load loader and give control to loader to achieve break through 512 bytes of bondage.512-byte limit exceeded The boot sector used in the preceding section is only 512 bytes. However, there are actually a lot of things that the operating

Running a virtual machine on Windows is a Linux operating system, how can you pass files between different operating systems?This is my personal firsthand, assuming you do not have a good method. It was very painful indeed. Here is a summary of my personal approach: method One. Very useful:* * * * Using a winscp software, it is an open-source g

example, the DHCP service is enabled for common Virtual Machine Software (VMware Workstation and VirtualBox) by default, and the DHCP service is also supported by Tails by default, eliminating the need for you to configure Nic parameters (such as IP addresses and masks). 1.3.1 install on a VM To use Tails in a virtual machine, first create a blank Virtual System (Guest OS). We recommend that you allocate 1 GB of memory on the memory official website.

Operating system notes (11) virtual memory, operating system virtual memory Virtual Memory Demand paging Page Replacement Algorithm FIFO first-in-first-out Optimal Replacement: the least used pages in the future. It is difficult to implement. LRU: least recently used. The above approxima

wait I/O. Solving method L Exchange Technology: a part of the temporarily unable to run the process (blocking the process) to the external memory (only the program and data, the PCB does not change out), to make room for space, can invoke a new process to execute. • Virtual Storage technology: Each process can only load part of the program and data 4. Suspend: The process is exchanged to the external memory, the state becomes suspended state 4.1 Cause of Process suspend (P91) L Process all blo

I. Basic concepts of real-time systems POSIX defines what a real-time system is: a system that provides the required level of service within a limited response time. Another definition

the cache, which may be several orders of magnitude different. Therefore, to ensure the certainty and predictability of the execution time, to meet the real-time needs, some systems will no longer use the cache or use the CPU without the cache. Another hardware factor is virtual memory management. It is really useful for multi-user and multi-task

IntroductionProcess synchronization is an operating system level concept, in the context of multi-channel programs, there are different constraints, in order to coordinate this mutual restrictive relationship, the realization of resource sharing and process collaboration, so as to avoid conflicts between processes, the introduction of process synchronization.Critical ResourcesIn the

and missile launch, the computer can process the measured data of the measurement system as soon as possible, control the aircraft or missiles in time, or provide the information to the decision-makers through the display terminal. When used in steel rolling, petrochemical and other industrial production process control, also requires the computer to process the data sent by various sensors in a timely man

First, the real-time machine of Linux is analyzed. Then, based on the characteristics of multimedia applications, the embedded Linux System for multimedia applications is constructed by improving the real-time performance of Linux systems. Experimental results show that the

the software, but the disk needs to be installed for more than four hours, and it is not always possible to see a version of the Java interpreter installed and then deleted.D. Without real automatic installation, their engineers need to modify a lot of files on the computer before installing.E. Mid-installation if an error is not reported immediately, it takes four hours after installation to see the installation failed, but only to know that the ins

RTOS is real time operating system. It can response the outside event with a determinate time. According to the response time, it can seperate into hard real

real-time system application, we also need to make specific analysis based on specific situations to make full use of the CPU efficiency and explore the real-time potential of the kernel. 1. Task and embedded multi-task Real-

Original article address: Success Jun 28,200 5 Abstract: The maxim real-time clock (RTC) series includes several devices with a streaming charger, which can charge the second backup battery or capacitor. The battery or capacitor is used to maintain clock operation when the VCC powers down. The energy stored in the capacitor needs to maintain the clock for a c

yield ... Can switch to know what to do when switching ( look to understand, the rest is to write the program to achieve this look ... ) Create is the way to create the first time you switch. Take a closer look at yield, that's 100 jump to 300.Two execution sequences with one stack ...(3) What happens if we go further down the board?How to solve the problem?Why?From a stack to a stack of two ...Yield Toggle to switch the stack firs