02-12-2010
What do you mean by "shared memory"? The memory's not shared if changes in A aren't automatically reflected in B's memory. If you make a proper shared segment, A's shared mem will always be the same as B's shared mem. They'd literally be referencing the same memory.
Instead of deleting counters could you just reset them to zero? Or, better yet, make the thing that deletes counters delete them from the shared memory. All DB modifications must update the shared mem to keep it consistent, otherwise it's untrustworthy hence not worth having.
Last edited by Corona688; 02-12-2010 at 12:54 PM..
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IPC(2) Linux Programmer's Manual IPC(2)
NAME
ipc - System V IPC system calls
SYNOPSIS
int ipc(unsigned int call, int first, int second, int third, void *ptr, long fifth);
DESCRIPTION
ipc() is a common kernel entry point for the System V IPC calls for messages, semaphores, and shared memory. call determines which IPC
function to invoke; the other arguments are passed through to the appropriate call.
User programs should call the appropriate functions by their usual names. Only standard library implementors and kernel hackers need to
know about ipc().
CONFORMING TO
ipc() is Linux specific, and should not be used in programs intended to be portable.
SEE ALSO
msgctl(2), msgget(2), msgrcv(2), msgsnd(2), semctl(2), semget(2), semop(2), shmat(2), shmctl(2), shmdt(2), shmget(2)
Linux 1.2.4 1995-04-15 IPC(2)