Hi,
I have been trying to get the shared memory and IPC part of the
Linux-2.4.19 kernel... Does anyone know the significance of the 'seq' and
'seq_max' variables in the following ipc_ids structure?? Also what are the
values it takes and when is it initialised??
struct ipc_ids {
int size;
int in_use;
int max_id;
unsigned short seq; <--------- ??
unsigned short seq_max; <--------- ??
struct semaphore sem;
spinlock_t ary;
struct ipc_id* entries;
};
Also, I could not understand the significance of the ipc_buildid() function
which converts the id to a bigger value (both the input id and the output id
to the function are unique which is a sufficient requirement of the id).
This functiona makes use of the 'seq' and SEQ_MULTIPLIER (whose value is
32768) to generate this bigger value.
Could it be made to work without this buildid() function??
Thanks in advance,
Asmita from MAASK group
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