file consistency using mmap

kvm1983 · 07-27-2010, 03:48 PM

Hello all,
How can I achieve file consistency while using mmap? I have a block of code that needs synchronized access across processes (not threads). Using threads, one can regulate access to the mmaped portion of the file by locking it using a mutex. How can I achieve the same using different processes, some of which run in different programs?

Thanks,
Kshitij

greplinux · 07-29-2010, 12:48 AM

Have you tried using semaphores?

Thanks,

kvm1983 · 07-31-2010, 01:37 AM

I am not sure how I would use a semaphore to coordinate processes running under different programs. Place the semaphore in a shared memory segment ?

Thanks,
Kshitij