wait function

Thread: Synchronize objects in some cases.Basic Principles The thread synchronization mechanism is designed for the collaboration of various threads. Synchronization is the only way to ensure the persistence of shared data. In the synchronization

Wait function and waitpid function. function prototype: pid_t wait (int * Status) Status is an integer pointer pointing to an object to protect the status of the child process when it exits. Example: pid = wait (& Status)   This status is assumed to

Asynchronous I/O and Completion Ports for System Programming I. synchronous I/O and asynchronous I/O Before introducing this part, let's first get to know "asynchronous I/O ".Speaking of asynchronous Io, it is easy to think of synchronous I/O. For

jquery deferred objects using the detailedjquery is developed very quickly, almost every half-year, a small version every two months. Each version will introduce some new features. What I want to introduce today is a new feature--deferred object

This feature is important and the future will be the core approach to jquery, which radically changes how Ajax is used in jquery. To implement it, all of the Ajax code for jquery is rewritten. However, it is more abstract, difficult for beginners

var wait = function (DTD) { var DTD = $. Deferred (); Inside the function, create a new deferred object, var tasks = function () { alert ("Execution completed.")　　　　　　"); Dtd.resolve (New Date ());　　　　Returns the current time when execution

Deferred.promise () and. Promise () The two API syntax is almost the same, but there is a big difference. Deferred.promise () is a method of deferred instance, and he returns a Deferred.promise instance. A Deferred.promise object can be understood

1. Wait () and waitpid () function descriptionsWait ()Once the process has called wait (), it immediately blocks itself, and the wait automatically parses whether a child process with the current process has exited, and if it finds a child process

1. Creation of processesThere are four types of functions that create sub-processes under Linux: System (), fork (), exec* (), Popen ()1.1. System functionsPrototype: #include int system (const char *string); The system function executes the

What a computer can actually do is essentially very simple, such as calculating the number of two numbers, and then finding an address in memory, among other things. These most basic computer actions are called Instructions (instruction). The

Http://www.cnblogs.com/haippy/p/3252041.htmlThe previous three talk about "c++11 Concurrency Guide II (Std::thread detailed)", "C++11 Concurrency Guide Three (Std::mutex detailed)" respectively introduced the Std::thread,std::mutex,std::future and

The conversion of the user layer to the kernel layer on the X86 processor takes 600 CPU instruction cycles Critical section (Critical code snippet) is not a kernel object but uses kernel resource functionality to be mutually exclusive but not

A thread is an execution path to a process that contains independent stacks and CPU register states, each of which shares all of the process resources, including open files, signal identities, and dynamically allocated memory. All threads within a

The basic concept of multithreading and Delphi Threading Object TThread IntroductionXiaoruWIN 98/NT/2000/XP is a multitasking operating system, that is: a process can be divided into multiple threads, each thread takes up CPU uptime and resources,

Process 1 is the main first process init of all processes How to view the process: PS uax # Include # Include # Include # Include Int main (){Pid_t PID;Int A = 8;Printf ("current process ID: % d \ n", getpid ());PID = fork ();If (pid> 0) // What

Mutex object (Mutex)The kernel object can ensure that the thread has mutex access to a single resource. A mutex object contains a quantity, a thread ID, and a recursive counter. The behavior of the mutex object is the same as that of the key code

This article will record the process of learning the fork and wait (waitpid) functions.   1. Fork In Linux, the fork function is often used to create a new process. It is very special. When executed once, two values are returned, which is very

What the basic computer of the Linux Process can actually do is actually very simple, such as calculating the sum of two numbers, and finding an address in the memory. These basic computer actions are called commands ). A program is a collection of

Overview: Non-kernel object critical zones are very suitable for serializing access to data in a process because they are fast. However, we may want to synchronize some applications with other special events on the computer or operations executed in

The two signals that are often obfuscated are sigcld and sigchld. The signal sigcld is derived from System V. The meaning of the signal is different from that of the signal sigchld originating from BSD. Posix.1 signal is also called sigchld. the