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From: Kai Petzke <wpp@marie.physik.tu-berlin.de>
To: Michael Graff <explorer@vorpal.com>
Cc: postgres@postgres.Berkeley.EDU
Subject: Re: tas.s
Date: Thu, 8 Dec 1994 13:06:44 +0100 (MET)
Message-ID: <9412081223.AA00043@marie.physik.tu-berlin.de> (raw)
In-Reply-To: <199412060751.BAA04308@packrat.vorpal.com>

> 
> 
> I'm working on a quick port to NetBSD/i386-current and need to
> have an example i386 tas.s.

There is no such thing as a quick port of Postgres.

> Could someone mail this to me if
> possible, or tell me where to find it (other than downloading lots
> of megs over a 14.4k line.  ;)


The following works fine under Linux.  Insert into the file:

	~postgres/src/backend/storage/ipc

slock_t should be defined as char.



Kai
------------- snip here ---------------
#if defined(__i386__) && defined(__GNUC__)

static inline tas(lock)
    slock_t *lock;
{
    slock_t res;
    __asm__("xchgb %0,%1":"=q" (res),"=m" (*lock):"0" (0x1));
    return(res);
}

S_LOCK(lock)
    slock_t *lock;
{
    while (tas(lock))
        ;
}

S_UNLOCK(lock)
    slock_t *lock;
{
    *lock = 0;
}

S_INIT_LOCK(lock)
    slock_t *lock;
{
    S_UNLOCK(lock);
}

#endif /* __i386__ && __GNUC__ */

#endif /* HAS_TEST_AND_SET */


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