wait function

Synchronization and mutual exclusion under LinuxWhen it comes to the concurrency of Linux, it inevitably involves the synchronization and mutual exclusion between threads, and Linux mainly provides us with several ways to implement synchronous

These days tuning program (embedded Linux), the discovery program sometimes inexplicably die, each time is located in the program in the different system () function, directly under the shell Input system () function called in the command is also

Basic Operations Command: PS-AJX/-AUX/-EF view inter-process status/relationships Top dynamic display of processes in the system Nice run/renice by the specified priority change the priority of the running process Kill-9 Kill Process

2015.1.29When the parent process waits for a child process to terminate, it must call the wait function. If a process waits for the parent process to terminate, you can do the following: The disadvantage is that CPU time is wastedwhile (Getppid ()! =

Windows critical section, kernel event, mutex, semaphore. Critical section, kernel event, mutex, semaphore, all can complete the thread synchronization, here put their respective function call, structure definition, as well as apply the situation to

The following are from: http://blog.csdn.net/morewindows/article/details/7470936The use of critical section CS and event events in the classic thread synchronization problem is described earlier. This article describes the use of mutex mutex to

Divided into two parts: memory and process.Memory1) Check memory and memory allocation for several commands:A) Nmon: graphical interface, not only to look at the memory, but also to see the CPU, network, kernel, disk information, memory can see Swap,

Speaking of fork, you have to mention cow (copy on write), which is "copy on write". That is, when the fork occurs, the child process simply does not copy the parent process's memory page, but shares it with the parent process. When a child process

Waitpid () is similar to the Wait () feature, where the user master process waits for the child process to end or break. Can be used for synchronization between processesWait function prototypewait(int*status);function DescriptionWait () temporarily

Look at the problem first.Simply encapsulate the system () function: 1 intpox_system(const char*cmd_line) 2 { 3     returnsystem(cmd_line);

What is a process? When a user-typed command executes a program, it initiates a process for the system. However, unlike the program, in this process, the system may need to start one or more processes to complete independent multiple tasks. The main

The first of the CreateMutexfunction function: Create mutex (note vs. event creation function)Function Prototypes:HANDLE CreateMutex (Lpsecurity_attributeslpmutexattributes,Boolbinitialowner,Lpctstrlpname);Function Description:The first parameter

Many processes in Python are basically the same as C under Linux. Basic use of fork Let's look at the simplest example: #Coding:utf-8ImportOSdefmy_fork (): PID=os.fork ()ifPID = =0:Print 'This is child, PID =%d, parent id =%d'%(Os.getpid (),

The subprocess module is used to manage child processes, can call external commands as child processes, and can connect to the Input/output/error pipeline of child processes to get related return information. Like the Linux process, a process can

Reference http://www.ruanyifeng.com/blog/2011/08/a_detailed_explanation_of_jquery_deferred_object.htmlThe Ajax method has been rewritten since the jQuery1.5 version, not the same as it used to be. Now $.ajax () will return a Promise/deffered

Introduction to the first threadSaid Python thread, its encapsulation and methods are also more diverse, the use of more convenient. There are currently three main ways to do this.1.1Method One: Create a new thread by using a function in the thread

Python implements multithreading primarily through the threading package in the standard library.In today's network era, every server receives a large number of requests. The server can handle these requests in a multi-threaded manner to improve the

1.addBack () A. Third-item's Li next several neighboring nodes (including Third-item) $ ("Li.third-item"). Nextall (). Addback (). CSS ("Background-color", "Red"); B. Similar to the end () method, the Div.after-addback and P

In Linux driver development, delay functions are often used: Msleep,mdelay/udelay. Although both Msleep and Mdelay have a delaying effect, they are different. 1.) for the module itself Mdelay is a busy wait function and cannot run other tasks during

One, definition, what is zombie process, orphan process Orphan process: A parent process exits, and one or more of its child processes are still running, then those child processes will be orphaned processes. The orphan process is adopted by the