Re: Writable global section?

From: Brian Gerst (
Date: Wed Oct 09 2002 - 10:06:43 EST

Richard B. Johnson wrote:
> I would like to be able to write to that variable and have it seen
> by other tasks, since shared memory is shared memory. It's a shame
> to mmap a shared library upon startup and then have to mmap some
> additional shared memory for some inter-process communication.

There are only two ways to share memory between processes:
- SYSV shared memory
- using clone() to share the VM.

Shared libraries != shared memory. Each mapping of a shared library is
copy-on-write. The purpose of shared libraries is to save memory, not
for IPC.

				Brian Gerst

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