shared memory

Linux inter-process communication (System V) --- shared memoryPrinciple of shared memory IPC The shared-memory inter-process communication mechanism is mainly used to achieve a large amount of data transmission between processes, as shown in the

For a long time I have only been able to smell the name, and have not seen its shape. Finally, in this system of learning Linux programming access to shared memory. Sure enough.In the previous article we talked about the semaphore, the personal

This time for everyone to bring the use of PHP shared memory and signal control using a detailed, PHP shared memory usage and signal control of the use of considerations, the following is the actual case, to look at. Shared memory Shared memory is

Shared memory is one of the IPC mechanisms. It allows two unrelated processes to access the same memory, which is a very efficient way to pass data.Shmget function原型：intsize,int shmflg)头文件：功能：创建/获取一个共享内存，成功则返回共享内存的描述符id，失败返回-1参数：key：键值

A shared memory area is a portion of physical memory that is shared by multiple processes. If more than one process maps the memory region to its own virtual address space, those processes can access the shared memory area directly, allowing

Unix shared memory highlights shared memory advantages: 1. fast and efficient data transmission between processes without passing data through the kernel, that is, copying data without calling the system. 2. as the kernel continues * nix shared

One, shared memoryThe kernel manages a piece of physical memory, allowing different processes to map at the same time, multiple processes can map the same piece of memory, the physical memory that is mapped at the same time by multiple processes ,

The previous article learned about shared memory: http://www.cnblogs.com/charlesblc/p/6142139.htmlAccording to this http://blog.chinaunix.net/uid-26335251-id-3493125.htmlOne more article:1. Shared memory allows two or more processes to share a given

(I) view and release IPC Resources [Root @ David ~] # IPCS-M ------ shared memory segments -------- key shmid owner perms bytes nattch status ...... 0xbe3bb918 5439503 Oracle 640 419438592 22 [root @ David ~] # IPCS-m-I 5439503 shared memory

Shared Memory principleShmget function Syntax:Shmat function syntaxSHMDT function syntaxCode Analysis:/*SHMEM.C*/#include#include#include#include#include#includestring.h>#defineBuffer_size 2048intMain () {pid_t pid; intShmid; Char*shm_addr; CharFlag[

Oracle study--ipcs Manage shared memoryU shared memory, semaphore, queue information management under Nix/linuxUnder Unix/linux, there are often problems caused by shared memory, semaphores, queues, and other shared information that are not cleaned

1. Create/acquire a shared memory#include #include / * for Mode constants */#include / * for O_* Constants */int Shm_open (const char *name, int oflag, mode_t mode);Parameters:Name: Shared memory names; Oflag: With the Open

Vxmp is a VxWorks component that provides shared-memory objects dedicated To high-speed synchronization and communication between tasks running in Separate instances of VxWorks. ====================================== What is "separate instances of

System v ipc (3)-shared memory, ipc I. Overview 1. Shared memory allows multiple processes to share the same block of physical memory. 2. Unlike pipelines and message queues, there is user memory space in the share, and no kernel intervention is

This article mainly introduces the concept of understanding the PHP shared memory and advantages and disadvantages, has a certain reference value, now share to everyone, the need for friends can refer to Shared memory is an efficient way to share

Before mentioning the Interprocess communication pipeline, Message Queuing, semaphore, and then where the semaphore is a PV operation, the manipulated is a shared resource. In the IPC module we mentioned, Message Queuing is for the data unit

I. Overview In many cases, in Windows programs, there is often a need to exchange data and communicate data between processes. The WIN32 API provides a number of functions that allow us to communicate between processes in a convenient and efficient

The shared memory area is the fastest available in the IPC form . Once the memory area is mapped to the address space of the process that shares it, the transfer of inter-process data no longer involves the kernel . However, there is usually some

How the kernel guarantees that each process addresses the memory page of the same shared memory area1. Page cache and swap cache pages: a physical page of an accessed file resides in the page cache or swap cache, and all the information for a page

The process can read and write memory directly without any data replication. To exchange data between multiple processesInformation, the kernel sets aside a memory area, which can be mapped by the process to be accessedTo its own private address