ppqa process

First, about the process lock.In fact, about the process of the lock is not good to talk about, the role and the thread of the mutex (also known as the global lock is called synchronous lock) effect is almost the same.are used to lock up public resources for data protection.When a process wants to operate a public resource, it can "lock" the public resource

(Switch) analysis of the problem that the tomcat process unexpectedly exits, and the tomcat process exits The test environment of a department prior to this section reports that tomcat will exit unexpectedly. After checking the actual environment, we find that it is not a jvm crash. The log contains a process destruction record, from pause to destory: org.apache.

1.1 Process structureEach process has its own properties, represented by a TASK_STRUCT data structure, which contains the details of the process, including the process identifier (PID), the memory area occupied by the process, the associated file descriptor, security informa

Process Control: Process creation, termination, blocking, waking, and switchingThe main function of process control is to implement effective management of all the processes in the system, which has the functions of creating new processes, undoing existing processes, and implementing process state transitions. In the o

Linux Kernel Analysis Eighth Week study summary-process switching and system general execution processHuang (Original works reproduced please specify the source)"Linux kernel Analysis" MOOC course http://mooc.study.163.com/course/USTC-1000029000I. SUMMARY OF KNOWLEDGE Basic concepts and related knowledge of process scheduling in Linux How the schedule function implements

Tags:. com pos process scheduling state Mutex count log interrupt stack1.1 Process structureEach process has its own properties, represented by a TASK_STRUCT data structure, which contains the details of the process, including the process identifier (PID), the memory area oc

My user process needs to communicate with my service process, and I need to be aware of the way it communicates through file mappings and events:1. Need low privilegeVarSecmem:security_attributes;Asd:security_descriptor;BeginFexistsalready: = False;InitializeSecurityDescriptor (@aSD, security_descriptor_revision);SetSecurityDescriptorDacl (@aSD, True, Nil, False);Secmem.nlength: = SizeOf (security_attribute

1) Example: Ping baidu.com This is used at the end of a command, you can put this command in the background to execute, but this is also possible because the terminal exit causes the process ye to exit2) nohup background operation ( recommended )Example: Ping baidu.com This will not affect process execution even if the terminal exits3) CTRL + Z process pausedScen

First, Binder class1. Role: Binder is the medium of communication between client and server (connecting various manager bridges), the client obtains the data provided by the server side through Binder object(Why do you use binder to provide data, and the server cannot pass it on to client data?) ）Because the server side exposes its data through binder creation interface, it can prevent other hackers to invade, cause the data to be stolen or tampered with, only let other users get the data we wan

Exception hint: "The file is being used by another process and the process cannot access the file." This error is easy to do when you open a file, try to reopen the file, or if you want to do something else with the file after you open it. The common cause of this error is that there is a problem with the parameter setting when constructing System.IO.FileStream. General Habits Direct use: FileStream fs = ne

PS AX displays a list of current system processesPID TTY STAT Time COMMANDPS auxDisplays a detailed list of current system processes and process usersUSER PID%cpu%MEM VSZ RSS TTY STAT START time COMMANDIf the output is too long, the pipe command lesssuch as PS Ax | LessTo see if a specific process is running, the secondary grep commandFor exampleps aux | grep pythonOutputPID TTY STAT Time COMMAND3255 pts/2

Basic concepts: In Unix/Linux, a child process is created by a parent process and a new process is created by a child process. The end of the Child process and the running of the parent process are asynchronous processes, that is,

Document directory 1.1. System 1.2 popen: create a sub-process 1.3 exec Functions 1.4 fork 6.2 memory ing and sub-process: 6.3 copy of file descriptor 1. What is a process: a process is a program in execution Program: code> resource> CPUProcess has a lot of Data Maintenance:

Process RelationshipsProcess GroupA process group is a collection of one or more processes. Typically, they are combined in the same job, and each process in the same process group receives various signals from the same terminal, each with a unique process group ID. Each

This section focuses on the process of creating processes (threads), and the following will not differentiate between processes and threads;Basic knowledgeIn a Linux system, the first process is inherent in the system and is arranged by the designer of the kernel; a new process must be copied by an existing process, no

The software process mainly refers to the software engineering process, that is, the sequence and relationship of various development stages and activities within the Organization during the software development process. The organic operation of these activities can complete the software development process. Some peop

Inter-process communicationProcesses are isolated from each other, and to implement interprocess communication (IPC), the Multiprocessing module supports two forms: queues and pipelines, both of which are delivered using messaging.Process Queues QueueUnlike the thread queue, the process queue generation is generated using the multiprocessing module.When a child process