shared memory

POSIX standardShm_open:Open or create a shared memory area shm_unlink: Delete a shared memory area ftruncate: resizing a file or shared memory areaSem_open:CreateSignal VolumeSem_wait: Wait for the semaphoreSem_post: Send Signal volumeSem_close:

Shared memory is the most basic communication mechanism in LUnix system, and also the fastest communication mechanism.Shared memory is a chunk of memory (segment) that is set aside by the kernel for purposes of exchanging information between

Oracle study Case-the "strange phenomenon" of viewing shared memory through IPCSIn an Oracle 11GR2 environment, the shared memory is viewed through the IPCS command, and it is found that only 4096Bytes of memory is allocated to Oracle, and this

In the Android anonymous shared memory driver source code analysis, this article introduces the implementation process of the anonymous shared memory driver. Based on the Android anonymous shared memory driver, this article introduces the Android

Foreword 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, such as QueryCache, cache ThreadCache for connection

Shmctl Delete shared memory using shmctl: Int shmctl (INT shmid, int cmd, struct shmid_ds * BUF ); Int shmid: the ID of the shared memory. Int cmd: A control command. The optional values are as follows: Ipc_stat gets the shared memory

Online collection   Semsys: seminfo_semmni(Solaris9 Release) InSolarisVersion 10 is out of date. Description Specifies the maximum number of signal identifiers. Data Type Signed integer Default Value 10

OverviewThe shared memory area is the fastest IPC form . Once such memory is mapped to the address space of the process that shares it, these inter-process data transfers no longer involve the kernel, in other words, the process no longer passes the

original articles, reproduced please indicate the source ... I. Background of the problem Recently to do a learning sharing report on Cuda, I would like to make an example of using Cuda for image processing in the report, and use shared memory to

1. Introduction to shared memory The shared memory zone is the fastest form of IPC. data transmission between these processes no longer involves the kernel. In other words, processes no longer transmit data by executing system calls that enter the

The following are common php shared memory functions used for inter-process communication. Shm_attach-Creates or open a shared memory segmentShm_detach-Disconnects from shared memory segmentShm_get_var-Returns a variable from shared

Linux shared memory chatting room shared memory is very effective and fast, suitable for transferring large data between processes. However, the shared memory will not be released with the termination of the program. It must be released in the

This article uses two pieces of code, one is to create a shared memory and write the relevant data to it. The other is to obtain the shared memory and read the data. The code below: Server. C: Get the shared memory and write data to the shared

Article Title: a simple way to modify shared memory in linux. 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.

A) meaning: multiple processes share part of the physical memory. Fast and convenient access B) Create shared memory first: int shmget (key_t key, int size, int shmflg) 1. Key: indicates the Key value of shared memory; 0/IPC_PRIVATE A) Key = 0: This

#include #include int Shmget (key_t key, int size, int shmflag) When the key value is Ipc_private, Shmflag should be ipc_creat, the new shared memoryA key value other than ipc_private should be the created key, Shmflag should not

1.awk IntroductionAwk is a powerful text analysis tool. SED is often used for the processing of an entire row, whereas awk prefers to slice each row into a field (that is, a column) with a Space and TAB key for the default delimiter. Awk is suitable

Shared memoryShared memory is a portion of physical memory that is shared by multiple processes. Shared memory is the quickest way to share data between processes, where a process writes data to shared memory, and all processes that share that

Today we continue to study POSIX IPC objects, this time by learning how to use POSIX shared memory, starting with:The following program is written to create a shared memory:Compile run:Where is POSIX's shared memory stored? The POSIX message queue

Today, a problem occurred, in the restart * * *, the use of the Start command, the results of the program in any event, the Final Solution: View transmit's log has no results, and then view its next nohup.out, with the following