[dotgnu-pnet-commits] [SCM] DotGNU Portable.NET engine, compilers and tools (pnet) branch, master, updated. f339bfb01915e953ddb43978ebd49095759f55d3

[Klaus Treichel]

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- Log -----------------------------------------------------------------
http://git.savannah.gnu.org/cgit/pnet.git/commit/?id=f339bfb01915e953ddb43978ebd49095759f55d3

commit f339bfb01915e953ddb43978ebd49095759f55d3
Author: Klaus Treichel <address@hidden>
Date:   Sat Mar 27 12:59:20 2010 +0100

    Disable InterlockedExchange on arm architectures < 6.

diff --git a/ChangeLog b/ChangeLog
index c19cfd1..7f34a3d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2010-03-27  Klaus Treichel  <address@hidden>
 
+       * support/interlocked_arm.h: Disable the InterlockedExchange functions
+       for arm architectures < 6 because they don't interoperate correctly with
+       the emulated InterlockedCompareAndExchange functions.
+
        * support/interlocked_slist.c (ILInterlockedSListAppend): Exchange the
        list's tail with release semantics to make sure all changes done before
        are visible by other cpus at the time the exchange is done.
diff --git a/support/interlocked_arm.h b/support/interlocked_arm.h
index 3d205ae..604ac0f 100644
--- a/support/interlocked_arm.h
+++ b/support/interlocked_arm.h
@@ -838,6 +838,15 @@ static IL_INLINE void ILInterlockedOrU4_Full(volatile 
ILUInt32 *dest,
 #else /* __ARM_ARCH__ <= 5 || __ARM_ARCH_6M__ */
 
 /*
+ * Disable the InterlockedExchange functions on ARM V5 and less because they
+ * dont interact correctly with the emulated InterlockedCompareAndExchange
+ * versions.
+ * We may use them later for TestAndSet implemenations which are not
+ * guaranteed to interact correctly with the other functions.
+ */
+#if 0
+
+/*
  * Exchange two 32 bit integers.
  */
 static IL_INLINE ILInt32 ILInterlockedExchangeI4_Full(volatile ILInt32 *dest,
@@ -877,6 +886,8 @@ static IL_INLINE void *ILInterlockedExchangeP_Full(void * 
volatile *dest,
 }
 #define IL_HAVE_INTERLOCKED_EXCHANGEP_FULL 1
 
+#endif /* 0 */
+
 #endif /* __ARM_ARCH__ <= 5  || __ARM_ARCH_6M__ */
 
 #endif /* defined(__GNUC__) */

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                 |    4 ++++
 support/interlocked_arm.h |   11 +++++++++++
 2 files changed, 15 insertions(+), 0 deletions(-)


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