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Issues with shared memory / Extended ALLOCATE statement
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PaulLaidler
Site Admin


Joined: 21 Feb 2005
Posts: 8283
Location: Salford, UK
PostPosted: Tue May 24, 2011 6:04 pm    Post subject: Reply with quote
Yes your summary is about right but until I investigate the extent of the problem remains unknown.
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PaulLaidler
Site Admin


Joined: 21 Feb 2005
Posts: 8283
Location: Salford, UK
PostPosted: Wed Aug 03, 2011 8:52 am    Post subject: Reply with quote
The following program illustrates the fact that you can have shared memory between two instances of the same executable.

First make sure that the file stat.dat is erased and then run the executable in one DOS box. Now run the same exe in a another DOS box.

Code:
include <windows.ins>
character,pointer::msg*80
logical fexists@
integer ercode
  allocate(msg, SHARENAME="MyMemory")
  if(.NOT. fexists@("stat.dat",ercode)) then
    OPEN(10,FILE="stat.dat")
    CLOSE(10)
    print*, "Type a message to send. Do not use spaces..."
    read*, msg
    call SIGNAL_SEMAPHORE@("MySemaphore")
    deallocate(msg)
  else
    print*, "Waiting for message..."
    call WAIT_ON_SEMAPHORE@("MySemaphore")
    print*, msg(1:len_trim(msg))
  endif     
end
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