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From: Niklas Holsti <niklas.holsti@tidorum.invalid>
Newsgroups: comp.lang.ada
Subject: Re: POSIX.Semaphores question
Date: Sat, 03 Dec 2011 21:59:31 +0200
Organization: Tidorum Ltd
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Date: 2011-12-03T21:59:31+02:00
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On 11-12-02 17:43 , awdorrin wrote:
> I'm using the Florist POSIX Libraries and have code that is similar to
> the following:
>
> In the spec file:
>
> Sem_READY : Semaphore;
> READY         : Semaphore_Descriptor;
> pragma Export( Ada, READY, "ready");

This pragma gives the variable a very short linkage name, "ready", which 
is moreover a common word. Perhaps the same name is used by some other 
module of the program, for some other program item, and this confuses 
the linker. Does the linker give any errors or warnings?

Try it with a longer name, one less likely to be in use already for 
something else.

>
> Then in my body:
>
> POSIX.Semaphores.Initialize( Sem_READY, 1);
> READY := POSIX.Semaphores.Descriptor_Of( Sem_READY );
>
> When executed, READY is always set to null.
>
> If I run the code through GDB and print READY, it always displays 0x0.
> However, if I call POSIX.Semaphores.Descriptor_Of( Sem_Ready )
> I get the right address returned: (access posix.c.sem_t) 0x8321540
>
> I have no idea why the assignment is failing and not generating an
> exception....


-- 
Niklas Holsti
Tidorum Ltd
niklas holsti tidorum fi
       .      @       .