IPC::SharedMem - SysV Shared Memory IPC object class
A class providing an object based interface to SysV IPC shared memory.
Creates a new shared memory segment associated with
. A new
segment is created if
is equal to
does not already have a shared memory segment associated
with it, and
<i>FLAGS</i> & IPC_CREAT is true.
On creation of a new shared memory segment
is used to
set the permissions. Be careful not to set any flags that the
Sys V IPC implementation does not allow: in some systems setting
execute bits makes the operations fail.
Returns the shared memory identifier.
bytes to the shared memory segment at
true if successful, or false if there is an error. See shmwrite.
Remove the shared memory segment from the system or mark it as removed as long as any processes are still attached to it.
Returns true if the shared memory segment has been removed or marked for removal.
Returns an object of type
which is a sub-class
. It provides the following fields. For a description
of these fields see you system documentation.
Permanently attach to the shared memory segment. When a
object is attached, it will use memread and memwrite instead of
shmread and shmwrite for accessing the shared memory segment.
Returns true if successful, or false on error. See shmat.
Detach from the shared memory segment that previously has been attached to. Returns true if successful, or false on error. See shmdt.
Marcus Holland-Moritz <email@example.com>
Version 2.x, Copyright (C) 2007, Marcus Holland-Moritz.
Version 1.x, Copyright (c) 1997, Graham Barr.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.