shared memory

A) meaning: multiple processes share part of the physical memory. Fast access, convenient B) first create shared memory: intshmget (key_tkey, intsize, intshmflg) 1.Key: indicates the shared memory key value; 0/IPC_PRIVATEa) Key0: this is not created,

This paper mainly analyzes the memory and I/O related system calls and library functions of the implementation principle, according to the principle of the need to pay attention to the problem and optimization of the focus of the system, this

1. Preface All examples of this post are based on the RHEL6.5 platform (Linux kernal:2.6.32-431.el6.i686). 2. Introduction to Shared MemoryThe various inter-process communication methods described earlier in Linux, such as pipe (pipeline), FIFO

1 Shared memoryBasic Features:(1) Shared memory is one of the most efficient inter-process communication methods, and processes can read and write directly to memory without requiring any copy of the data.(2) In order to exchange information between

This paper mainly introduces four kinds of methods to realize shared memory synchronization.Shared memory is the most efficient way to communicate between processes, and processes can read and write directly to memory without requiring any copy of

This article is organized from the Network, reference page (references): http://stackoverflow.com/questions/5658568/ How-to-list-processes-attached-to-a-shared-memory-segment-in-linux http://publib.boulder.ibm.com/infocenter/

This article analyzes the way of shared memory reading and writing in Go language. Share to everyone for your reference. The specific analysis is as follows: The previous analysis of the Go language pointer operation and embedded C code method, do

shared Memory is one of the fastest and fastest forms of IPC that UNIX provides for interprocess communication. Why is the fastest, because the data does not need to be replicated between the client process and the server process, so it is the

"Several confusing related concepts" Process mutex: In a multi-channel program environment, only one process is allowed to access the critical resource at a time. Process synchronization: Refers to the coordination of multiple

Article Title: how to set LINUX shared memory. 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. We can modify

Set the kernel parameters of shared memory in Linux. in Linux, shared memory involves three kernel parameters: SHMMAX, SHMMNI, and SHMALL. besides the default value, we can also make temporary or permanent changes to the environment and application

SYS V IPC object: For a file object created in the kernel, which is the file identifier (which refers to all the information of a file object), the file descriptor in the process typically uses the currently smallest available value.For the IPC

The shared memory of the server and the shared memory initialization will be performed when the Gs is opened when the client opens the server to receive notifications. The process is complex and has been read many times, today, I finally learned

This article mainly analyzes the implementation principles of memory and I/O-related system calls and library functions, and provides the problems that need to be paid attention to during use and the focus of optimization, system calls involved in

One of the memory database R & D logs. The strange problem of shared memory Papayas 20091211 I. Sequencing The database is very complex in the application system. Taking ORACLE database as an example, its complexity is no less than that of

1. Example of parent-child process communication. The source code of SHM. C is as follows: # Include # Include # Include # Include # Include # Include # Define size 1024 Int main () { Int shmid; Char * shmaddr; Struct shmid_ds Buf; Int flag = 0

1. Communication of affinity process, parent write sub-readthought analysis:1 First we need to create a shared memory.2) The fork function is used to create a parent-child process. After the fork function is created, two processes are executed

I. Understanding of Shared memory(1) Shared memory is one of the most efficient interprocess communication processes that can read and write directly to memory without requiring any copy of the data.(2) In order to exchange information between

Shared memory and Message Queuing are also ways of communicating between processes.Shared memory (similar to semaphore operation)#include 1, int shmget (key_t key,size_t size,int SHMFLG);Function: Create a new piece of memory or return the built-in

This article mainly introduces MySQL global shared memory. The global shared memory is mainly used by MySQLInstance (mysqld process) and the underlying storage engine to store various global operations and shared temporary storage information, for