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Full Discussion: System V IPC problems
Top Forums UNIX for Advanced & Expert Users System V IPC problems Post 302339584 by gkreddy on Friday 31st of July 2009 02:25:47 AM
Old 07-31-2009
System V IPC problems

Hi all,

Is there a situation like system assigning same ID's for semaphores and shared memory at the same time.

Ex: When I try to create 10 Shared memory objects with starting key as 0x1500 and 10 semaphore objects with starting key as 0x1234 in the same program. Assume those are not deleted while exting the program. So, we can see those with ipcs command. ipcs listed some of the shared memory objects and semaphores having the same ID's.

Is it a problem of kernel? It it causes problems what type of problems it will cause?

Can we have same ID's for semaphores and shared memory?

Please respond to me.

Thanks in advance
G K Reddy Chinthalapudi
 

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ipcrm(1)						    BSD General Commands Manual 						  ipcrm(1)

NAME
ipcrm -- remove the specified message queues, semaphore sets, and shared memory segments SYNOPSIS
ipcrm [-M shmkey] [-m shmid] [-Q msgkey] [-q msqid] [-S semkey] [-s semid] ... DESCRIPTION
Ipcrm removes the specified message queues, semaphores and shared memory segments. These System V IPC objects can be specified by their cre- ation id or any associated key. The following options are used to specify which IPC objects will be removed. Any number and combination of these options can be used: -M shmkey Mark the shared memory segment associated with key shmkey for removal. This marked segment will be destroyed after the last detach. -m shmid Mark the shared memory segment associated with id shmid for removal. This marked segment will be destroyed after the last detach. -Q msgkey Remove the message queue associated with key msgkey from the system. -q msqid Remove the message queue associated with the id msqid from the system. -S semkey Remove the semaphore set associated with key semkey from the system. -s semid Removes the semaphore set associated with id semid from the system. The identifiers and keys associated with these System V IPC objects can be determined by using ipcs(1) SEE ALSO
ipcs(1) BSD
August 8, 1994 BSD
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