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Date: Thu, 2 Apr 2009 16:52:48 +0100
Message-ID: <5899fca70904020852s7d19a03dxd0c1910cae819888@mail.gmail.com>
Subject: Fwd: [jira] Created: (HARMONY-6137) [drlvm][concurrent] AtomicLong
	compare and swap returning wrong indicator
From: Tim Ellison <t.p.ellison@gmail.com>
To: dev@harmony.apache.org
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I think this could be the cause of the concurrent test failures we are
seeing on M9 testing.


---------- Forwarded message ----------
From: Tim Ellison (JIRA) <jira@apache.org>
Date: 2009/4/2
Subject: [jira] Created: (HARMONY-6137) [drlvm][concurrent] AtomicLong
compare and swap returning wrong indicator
To: commits@harmony.apache.org


[drlvm][concurrent] AtomicLong compare and swap returning wrong indicator
-------------------------------------------------------------------------

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Key: HARMONY-6137
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 URL: https://issues=
.apache.org/jira/browse/HARMONY-6137
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Project: Harmony
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Issue Type: Bug
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Components: DRLVM
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Environment: Linux, r761319
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Reporter: Tim Ellison


Consider the following code that exercises AtomLong compare and swap operat=
ions:

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0AtomicLong atomLong =
=3D new AtomicLong(1);
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0System.out.println(a=
tomLong.get());
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0System.out.println("=
CAS 1,-4 =3D " +
atomLong.compareAndSet(1, -4));
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0System.out.println(a=
tomLong.get());
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0System.out.println("=
CAS -5,1 =3D " +
atomLong.compareAndSet(-5, 1));
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0System.out.println(a=
tomLong.get());

I expect it to print out:
=C2=A0 1
=C2=A0 CAS 1,-4 =3D true
=C2=A0 -4
=C2=A0 CAS -5,1 =3D false
=C2=A0 -4

Since the comparison of --4 and -5 fails.
However when running that code on harmony r761319 I see

=C2=A0 1
=C2=A0 CAS 1,-4 =3D true
=C2=A0 -4
=C2=A0 CAS -5,1 =3D true
=C2=A0 -4

i.e. the swap is not done, but the method returned true as though it
had done the swap.


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