On 01/05/10 23:03, Samuel K. Gutierrez wrote:
> I call shmctl IPC_RMID immediately after one process has
> attached to the segment because, at least on Linux, this
> only marks the segment for destruction.
That's correct, looking at the kernel code (at least in the
current git master) the function that handles this - do_shm_rmid()
in ipc/shm.c - only destroys the segment if nobody is attached
to it, otherwise it marks the segment as IPC_PRIVATE to stop
others finding it and with SHM_DEST so that it is automatically
destroyed on the last detach.
Christopher Samuel - Senior Systems Administrator
VLSCI - Victorian Life Sciences Computational Initiative
Email: firstname.lastname@example.org Phone: +61 (0)3 903 55545