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NNTP-Posting-Date: Mon, 03 Sep 2007 10:49:42 -0500
From: "Steve" <nospam_steved94@comcast.net>
Newsgroups: comp.lang.ada
Subject: Anyone have an IA-32 locked instruction library for GNAT?
Date: Mon, 3 Sep 2007 08:51:43 -0700
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Date: 2007-09-03T08:51:43-07:00
List-Id: <comp.lang.ada>

The IA-32 processors (and derivatives) support locked forms of the 
instructions:
ADD,  ADC,  AND, BTC,  BTR, BTS, CMPXCHG, CMPXCH8B, DEC, INC, NEG, NOT, OR, 
SBB, SUB, XOR, XADD, and XCHG.

According to Intels' documentation, "In a multiprocessor environment, the 
LOCK# signal insures that the processor has exclusive use of any shared 
memory while the signal is asserted."

By any chance has anyone implemented the inline assembly functions for GNAT 
to make these functions available on IA-32 systems?

The same library shuld work on Linux and Windows.

With the new multi-core processors these instructions can be useful for very 
low overhead task safe access to shared resources.

Regards,
Steve
(The Duck)