SystemVIPC now compatible with Ruby 1.8 and Ruby 1.9

11Sep

SystemVIPC now compatible with Ruby 1.8 and Ruby 1.9

SystemVIPC is a Ruby 1.8 module for System V Inter-Process Communication: message queues, semaphores, and shared memory.
We Have released a version from SystemVIPC-0.8 RC1 that is compatible and works fine for Ruby 1.8 and Ruby 1.9 .
It's really nice to work with SysVIPC with its simple used APIs , Here I'll provide a simple tutorial for using SysVIPC Shared Memory.

Downloading and Installing

Download SysVIPC Compatible Release for Ruby 1.8 , Ruby 1.9 at : http://github.com/espace/sysvipc-0.8-rc1.git
Extract the Source , then run : ruby1.9 extconf.rb ( note : run with the ruby version you want ) then : make install Makefile
You will have the sysvipc.so file appearing now
In all cases you have to put these lines of code :

require 'sysvipc.so' include SystemVIPC

Shared Memroy Example

## Testing Shared Memory

$key = ftok '/tmp/shm' , IPC_CREAT
$sh = SharedMemory.new($key, 33554432, IPC_CREAT | 0660)
$sh.attach
child = open("|-","w+")
if child.nil?
$sh.write('In Shared Memory')
sleep 2
$sh.write('now showing you the world!')
else
sleep 1
puts $sh.read(100)
sleep 3
puts $sh.read(100)
end

Lines 1 , 2 , 3 we convert the path name into as SysVIPC key , then we initiate if necessary 8 MegaBytes shared Memory Segment associated with key , then finally we attach the shared memory segment.
lines 4 , 5 we for a child for the process .
At lines 6 , 8 we use the SharedMemory method write to write two data items to the shared memory segment
lines 11 , 13 the forked child process reads the data written by the parent process in the shared Memory segment and prints it.
sleep call is used as dummy events syncronization..
Hope this is helpful....
View The SystemVIPC documentation at : http://sysvipc.rubyforge.org/

Written By:

Moustafa A. Emara ( moustafaemara.wordpress.com )

Comments

1 roger wrote: on Wednesday, September 24, 2008:

http://raa.ruby-lang.org/project/mmap/ is nice, too. Wonder if it works for 1.9...
-=R

eSpace

Blogs