Very Computer

Problem:

I would like to lock down memory (mlock) and then allow 2 processes
to write to it.

-------

Situation:

I have a program that locks down 64Meg (in sevral pieces).
I cannot make it multithreaded due to a thread UNSAFE third party
component.
I need to break it up into 2 processes.

-------

Thanks

John B. Petritis

p.s. Please send a copy of your reply directly to me at my email addr.

: Problem:
:
: I would like to lock down memory (mlock) and then allow 2 processes
: to write to it.
:
: -------
:
: Situation:
:
: I have a program that locks down 64Meg (in sevral pieces).
: I cannot make it multithreaded due to a thread UNSAFE third party
: component.
: I need to break it up into 2 processes.
:
[emailed author also]

You really haven't asked a question as I see no '?', so are you asking
for a way to get around having to fork 2 processes and instead use
threads?  Are you asking how to keep the 2 processes out of each others
way?  It's not clear why you lock down several pieces instead of all at once.

As for the 2 process r/w problem, the obvious solution is to use a semaphore(s).
As for shared memory, I find mmap(2)'d files more useful and let the OS
decided what memory is being accessed and should stay in memory and avoid
the mlock problems all together.  

Hope this helps.

-bryan