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Full Discussion: synchronize as in java
Top Forums Programming synchronize as in java Post 48554 by S.P.Prasad on Wednesday 10th of March 2004 05:16:53 AM
Old 03-10-2004
Quote:
if any_fn is my_fn then semkey should be unique say sk
if any_fn is fn1 then semkey should be unique say sk1
if any_fn is fn2 then semkey should be unique say sk2
and so on
I tried a sample program with an array of function pointers and when I de-referenced it at any instances only the required code was executed.

Definitely the function pointer array contents were different but constant.

I might have wrongly analyzed the post.... but does this output helps you in anyway.

#include <stdio.h>

void (*fn[3])();

void my_fn()
{
printf ("my_fn\n" ) ;
}

void fn1()
{
printf ("fn1\n" ) ;
}

void fn2()
{
printf ("fn2\n" ) ;
}

main ( )
{
fn[0]=my_fn;
fn[1]=fn1;
fn[2]=fn2;

(*fn[0])();
(*fn[1])();
(*fn[2])();
}

Output:

my_fn
fn1
fn2

Is it possible to then take fn[0],fn[1],fn[2].... as semkey?
 

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LEARN ABOUT OSX

ipcrm

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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