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Re: Problem with semaphores and such.
- To: Oleg Goldshmidt <ogoldshmidt(at-nospam)computer.org>
- Subject: Re: Problem with semaphores and such.
- From: Oded Arbel <odeda-linux-il(at-nospam)betalfa.org.il>
- Date: Wed, 2 May 2001 19:19:46 +0000 (/etc/localtime)
- Cc: Linux-IL Mailing list <linux-il(at-nospam)cs.huji.ac.il>
- In-Reply-To: <m3hez34z1l.fsf@erwin.comgates.co.il>
- Sender: linux-il-bounce(at-nospam)cs.huji.ac.il
Yes it does - thanks!
Now all I have to do is deal with the rest of my bugs ;-)
Oded
On 2 May 2001, Oleg Goldshmidt wrote:
> From: Oleg Goldshmidt <ogoldshmidt@computer.org>
> Oded Arbel <odeda-linux-il@betalfa.org.il> writes:
>
> > public:
> > CCritical(char* pathname) {
> > union semun semopts;
>
> This is an incomplete declaration, as the compiler tells you.
> A union is a struct in which all members are allocated at the same
> address. The declaration syntax is similar to that of structs.
>
> Usually, doing sth like
>
> egrep -n semun $(find /usr/include -name \*.h) /dev/null
>
> helps. In this case, you'll find the following in bits/sem.h
> (which is included by sys/sem.h):
>
> /* The user should define a union like the following to use it for arguments
> for `semctl'.
>
> union semun
> {
> int val; <= value for SETVAL
> struct semid_ds *buf; <= buffer for IPC_STAT & IPC_SET
> unsigned short int *array; <= array for GETALL & SETALL
> struct seminfo *__buf; <= buffer for IPC_INFO
> };
>
> Previous versions of this file used to define this union but this is
> incorrect. One can test the macro _SEM_SEMUN_UNDEFINED to see whether
> one must define the union or not. */
>
> Hope it helps.
>
>
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