Shared memory for shared library

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Old 09-03-2008
Shared memory for shared library

I am writing a shared library in Linux (but compatible with other UNIXes) and I want to allow multiple instances to share a piece of memory -- 1 byte is enough. What's the "best" way to do this? I want to optimize for speed and portability.

Obviously, I'll have to worry about mutual exclusion.
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shmem(5)							File Formats Manual							  shmem(5)

shmem - enable or disable System V shared memory DESCRIPTION
The tunable is obsolete. The System V IPC shared memory subsystem is always enabled. Shared memory is an efficient InterProcess Communications (IPC) mechanism. One process creates a shared memory segment and attaches it to its address space. Any processes looking to communicate with this process through the shared memory segment, then attach the shared memory segment to their corresponding address spaces as well. Once attached, a process can read from or write to the segment depending on the permissions specified while attaching it. WARNINGS
Installation of optional kernel software, from HP or other vendors, may cause changes to tunable parameter values. After installation, some tunable parameters may no longer be at the default or recommended values. For information about the effects of installation on tun- able values, consult the documentation for the kernel software being installed. For information about optional kernel software that was factory installed on your system, see at AUTHOR
was developed by HP. SEE ALSO
shmmax(5), shmmni(5), shmseg(5). Tunable Kernel Parameters shmem(5)

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