[Linux-ia64] atomic add instruction

[Linux-ia64] atomic add instruction

[Swaminathan Sivasubramanian]

Hello Everyone,

I  want an atomic function that does addition of a constant to the value in
a memory location and returns the previous value in that location.

 Is there any macro/function defined in IA-64's atomic.h already. (will
fetch-and-add solve the purpose?) or one should write his own function for
it

Thanking in advance,
Swami

Re: [Linux-ia64] atomic add instruction

[David Mosberger]

There are compiler intrinisics for this purpose.  See the IA-64
processor-specific ABI for a description.  You have to include
<ia64intrin.h> to get the intrinsics defined.

	--david

>>>>> On Tue, 17 Jul 2001 15:09:46 -0700, "Swaminathan Sivasubramanian" <ssivasu@us.ibm.com> said:

  Swami> Hello Everyone,

  Swami> I want an atomic function that does addition of a constant to
  Swami> the value in a memory location and returns the previous value
  Swami> in that location.

  Swami>  Is there any macro/function defined in IA-64's atomic.h
  Swami> already. (will fetch-and-add solve the purpose?) or one
  Swami> should write his own function for it

  Swami> Thanking in advance, Swami



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