process exit

When we only fork () once, there are parent processes and child processes. There are two ways to avoid creating a zombie process: The parent process invokes functions such as Waitpid () to receive the child process exit status. The parent process

Original link: http://hongjiang.info/why-kill-2-cannot-stop-tomcat/Test environment feedback from a department before a section Tomcat will exit unexpectedly, we found that the actual environment is not the JVM crash, the log has a process to

1 Basic Overview 1.1 orphan process and zombie processAfter the parent process creates the child process, the ideal state is that the child process ends, the parent process reclaims the child process and frees the resources that the child process

1. Concept1, orphan process: A parent process exits, and one or more of its child processes are still running, then those child processes will become orphans. The orphan process will be adopted by the INIT process (process number 1) to ensure that

PHP Non-blocking modeby Chenyuan on July 31st,//Filed under→php Let PHP no longer block when PHP as a back-end processing needs to complete some long time processing, in order to quickly respond to page requests, without making a result return

Original link: http://bbs.chinaunix.net/thread-4093341-1-1.htmlSync---criticalsection,mutex,event,semaphoressynchronization objects about threads can be divided into kernel objects and non-kernel objects, the biggest difference being that kernel

Thread Concept:a thread is the smallest execution unit of an in-process, independent dispatch. Sometimes called lightweight processes (lightweight process,lwp). A process is an entity in progress, is the basic unit that is dispatched and dispatched

--an example of this article expands on the operation of threads under Linux, the synchronization of multithreading, and mutual exclusion.ObjectiveThread? Why are there processes that require threads, and what is the difference between them? What

The non-blocking mode refers to the use of the socket event message mechanism. Communication between the Server and the Client is asynchronous. PHP is no longer blocked. When PHP is processed as the backend, some long-term processing is required. In

In python, it is easy to use the OS module to run other scripts or programs so that the functionality provided by other scripts or programs can be used directly in the script without having to write code that implements that functionality again. To

C # operations Excel import and export method one, according to the project requirements, there are multiple methods for Excel operation, there are some class library programming design format, some JS based on the format of the table directly

Summary: WinForm development based on the. Net framework, mainly about the properties of some controls for the WinForm platform and the use of events.content: 1, Directory Class 2, Text dialog box 3, select Font and Color dialog 4, use of the

I received a telephone interview from an Internet company a few days ago. The interviewer asked me twice about the role of fork (). I was confused and said I did not know. The knowledge is still too narrow. The following summarizes the functions of

Article Title: Generation and prevention of Linux botnets. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. In

Some abnormal users try to migrate all activity records on the system (for example ~ /. Bash_history), but we can use dedicated tools to monitor the commands executed by all users. we recommend that you use process accounting to record your

Http://www.cnblogs.com/xrq730/p/4842483.htmlObjectiveWhen locating system problems, knowledge, experience is the basis, data is the basis, tools are the means of using knowledge to process data. The data mentioned here are: Run log, exception stack,

Methods and processes for collecting debugging events in the debugging subsystem (1 ). The application scenarios of software debugging are generally: This article is my note on reading the prepared by Mr. Zhang yinkui. This article mainly describes

1. What is a zombie process? The zombie, defunct, PS, and top commands of zombie processes can be seen. It refers to a process in the "zombie" state. Such a process is dead, but it is still stored in some way. It is said that it has died because

A system call is a collection of all system calls implemented by the operating system, namely, application programming interfaces (APIS ). Is the interface between applications and systems. The main function of the operating system is to create a

The IIS6 application pool is automatically disabled. Service unavailable application pool 'defaultapppool 'is automatically disabled because a series of errors occur in the process that provides services for the application pool.