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changeset 17662:695a6aba51c3

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8033545: Missing volatile specifier in Bitmap::par_put_range_within_word Summary: The method Bitmap::par_put_range_within_word reloads the original value during a CAS, which may be optimized away. Instead of reloading, use the value returned by Atomic::cmpxchg_ptr() for further processing. Reviewed-by: tschatzl, brutisso, tonyp Contributed-by: Matthias Braun <matthia.braun@sap.com>
author tschatzl
date Mon, 10 Feb 2014 10:34:52 +0100
parents a2e452cdf1d5
children 40353abd7984
files src/share/vm/utilities/bitMap.cpp
diffstat 1 files changed, 1 insertions(+), 1 deletions(-) [+]
line wrap: on
line diff
--- a/src/share/vm/utilities/bitMap.cpp	Fri Feb 07 12:51:08 2014 -0800
+++ b/src/share/vm/utilities/bitMap.cpp	Mon Feb 10 10:34:52 2014 +0100
@@ -107,7 +107,7 @@
     while (true) {
       intptr_t res = Atomic::cmpxchg_ptr(nw, pw, w);
       if (res == w) break;
-      w  = *pw;
+      w  = res;
       nw = value ? (w | ~mr) : (w & mr);
     }
   }