'Go Shared memory library'

goshm is a Shared memory library for linux and windows

Installation

go get github.com/gdygd/goshm

example

1. Create Shared Memory
2. Example of reading and writing to a shared memory using a User define structure

• "type ShmMem struct { ... }"

process1 example

package main

import (
  "fmt"
  "unsafe"

  "github.com/gdygd/goshm/shmlinux"
  //"github.com/gdygd/goshm/shmwin"   // windows lib package
)

type ShmMem struct {
  Name [10]byte
  Num1 int
  Num2 int
  Addr [10]byte
}

var SharedMem *ShmMem

const skey = 0x1234 // shared memory key

func main() {
  // linux os
  shminst := shmlinux.NewLinuxShm()   
  shminst.InitShm(skey, 1024)

  // windows
  // shminst := shmwin.NewWinShm()
  // shminst.InitShm("shmygd", 1024)

  // The code below is the same for all Windows Linux.
  //--------------------------------------------------------------
  // shminst.CreateShm() // Create or open shared memory
  // shminst.AttachShm() // Attach shared memory
  // shminst.DeleteShm() // Detatch and Delete Shared memory
  //--------------------------------------------------------------

  err := shminst.CreateShm()
  if err != nil {
  	fmt.Println("CreateShm err : ", err)
  }

  err = shminst.AttachShm()
  if err != nil {
  	fmt.Println("AttachShm err : ", err)
  }
  SharedMem = (*ShmMem)(unsafe.Pointer(shminst.Addr))

  copy(SharedMem.Addr[:], []byte(string("1234aa")))
  copy(SharedMem.Name[:], []byte(string("YGD")))
  SharedMem.Num1 = 11
  SharedMem.Num2 = 99

  var n int
  fmt.Scanf("%d", &n)

  fmt.Printf("\nmem#1 : %v\n", SharedMem)

  err = shminst.DeleteShm()
  if err != nil {
  	fmt.Println("DeleteShm err:", err)
  }
}

process2 example

package main

import (
  "fmt"
  "unsafe"

  "github.com/gdygd/goshm/shmlinux"
  //"github.com/gdygd/goshm/shmwin"   // windows lib package
)

type ShmMem struct {
  Name [10]byte
  Num1 int
  Num2 int
  Addr [10]byte
}

var SharedMem *ShmMem

const skey = 0x1234

func main() {
  shminst := shmlinux.NewLinuxShm()

  shminst.InitShm(skey, 1024)

  // windows
  // shminst := shmwin.NewWinShm()
  // shminst.InitShm("shmygd", 1024)

  // The code below is the same for all Windows Linux.
  //--------------------------------------------------------------
  // shminst.CreateShm() // Create or open shared memory
  // shminst.AttachShm() // Attach shared memory
  // shminst.DeleteShm() // Detatch and Delete Shared memory
  //--------------------------------------------------------------

  err := shminst.CreateShm()
  if err != nil {
  	fmt.Println("CreateShm err : ", err)
  }

  err = shminst.AttachShm()
  if err != nil {
  	fmt.Println("AttachShm err : ", err)
  }
  SharedMem = (*ShmMem)(unsafe.Pointer(shminst.Addr))

  fmt.Printf("mem#2 : %v\n", SharedMem)

  SharedMem.Num1 = 1
  SharedMem.Num2 = 2

  err = shminst.DeleteShm()
  if err != nil {
  	fmt.Println("DeleteShm err:", err)
  }
}