Shared memory creation in ruby

ruby-talk
1

Hi,

I am new to ruby and I want to write code which makes shared memory and
writes to it.Similar to the C code here:

void main(int argc, char* argv[])
{
   HANDLE mappedFile = 0;
   int oneSecond = 1000;
   char* shared = NULL;
   HANDLE eventHnd;

   eventHnd = CreateEvent(NULL, FALSE, FALSE, "TestSharedEvent");

   // STEP 1
   mappedFile = CreateFileMapping(INVALID_HANDLE_VALUE, NULL,
                  PAGE_READWRITE, 0, 4096, "TestSharedMemory");
   printf("CreateFileMapping returned %d\n", mappedFile);
   fflush(NULL);

   // STEP 2
   shared = (char*)MapViewOfFile(mappedFile, FILE_MAP_WRITE, 0, 0, 0);
   printf("MapViewOfFile returned %p\n", shared);
   fflush(NULL);

   memset(shared, 0, 4096);
   printf("memset worked\n");
   fflush(NULL);

   int counter = 0;
   while (1)
   {
      sprintf(shared, "value %d", counter++);
      printf("Sending new string: %s\n", shared);
      SetEvent(eventHnd);
      // STEP 5
      //Sleep(1000);
   }

   UnmapViewOfFile(shared);
}

Please suggest .Thanks in advance.

···

--
Posted via http://www.ruby-forum.com/.

2

void main(int argc, char* argv)

Ahem. "int main". (Unless you're in a freestanding environment,
which most people aren't.)

   mappedFile = CreateFileMapping(INVALID_HANDLE_VALUE, NULL,
                  PAGE_READWRITE, 0, 4096, "TestSharedMemory");

It might help readers if you mentioned what platform you were
targeting. I've never seen that call, so I can hardly speculate as
to what would replace it, and it seems likely that the corresponding
things might be platform specific.

-s

···

On 2010-02-10, ranjan sri <infibit@gmail.com> wrote:
--
Copyright 2010, all wrongs reversed. Peter Seebach / usenet-nospam@seebs.net
| Seebs.Net <-- lawsuits, religion, and funny pictures
Fair game (Scientology) - Wikipedia <-- get educated!

3

Seebs wrote:

void main(int argc, char* argv)

Ahem. "int main". (Unless you're in a freestanding environment,
which most people aren't.)

   mappedFile = CreateFileMapping(INVALID_HANDLE_VALUE, NULL,
                  PAGE_READWRITE, 0, 4096, "TestSharedMemory");

It might help readers if you mentioned what platform you were
targeting. I've never seen that call, so I can hardly speculate as
to what would replace it, and it seems likely that the corresponding
things might be platform specific.

-s

Well I am on windows Xp.I have been trying to get this working.
http://rubyforge.org/docman/view.php/85/1717/README.html
MMAP on windows.But wasn't successful.Any idea?I did install ruby
http://rubyforge.org/frs/download.php/66872/rubyinstaller-1.9.1-p243-rc1.exe
But do not know the rest of the procedure to get MMAP working.Having
been trying randomly.

Please advice

···

On 2010-02-10, ranjan sri <infibit@gmail.com> wrote:

--
Posted via http://www.ruby-forum.com/\.

4

Well, I'm afraid I can't help -- I know nothing about Windows programming.
But with the information about platform in view, perhaps someone else
can help you out!

-s

···

On 2010-02-10, di vi <infibit@gmail.com> wrote:

But do not know the rest of the procedure to get MMAP working.Having
been trying randomly.

Please advice

--
Copyright 2010, all wrongs reversed. Peter Seebach / usenet-nospam@seebs.net
| Seebs.Net <-- lawsuits, religion, and funny pictures
Fair game (Scientology) - Wikipedia <-- get educated!