Rename configure.in -> configure.ac. Based on PR #976.

[mono.git] / mono / utils / atomic.h

diff --git a/mono/utils/atomic.h b/mono/utils/atomic.h
index 79455ad9c435c889e9e2fb5289b365324b2ea29a..c1a1a94b47597e5e288ba306348925bf391c06a2 100755 (executable)
--- a/mono/utils/atomic.h
+++ b/mono/utils/atomic.h
@@ -79,6 +79,35 @@ static inline gint64 InterlockedAdd64(volatile gint64 *dest, gint64 add)
 }
 #endif
 
+#if defined(_MSC_VER) && !defined(InterlockedAdd)
+/* MSVC before 2013 only defines InterlockedAdd* for the Itanium architecture */
+static inline gint32 InterlockedAdd(volatile gint32 *dest, gint32 add)
+{
+       return InterlockedExchangeAdd (dest, add) + add;
+}
+#endif
+
+#if defined(_MSC_VER) && !defined(InterlockedAdd64)
+#if defined(InterlockedExchangeAdd64)
+/* This may be defined only on amd64 */
+static inline gint64 InterlockedAdd64(volatile gint64 *dest, gint64 add)
+{
+       return InterlockedExchangeAdd64 (dest, add) + add;
+}
+#else
+static inline gint64 InterlockedAdd64(volatile gint64 *dest, gint64 add)
+{
+       gint64 prev_value;
+
+       do {
+               prev_value = *dest;
+       } while (prev_value != InterlockedCompareExchange64(dest, prev_value + add, prev_value));
+
+       return prev_value + add;
+}
+#endif
+#endif
+
 /* And now for some dirty hacks... The Windows API doesn't
  * provide any useful primitives for this (other than getting
  * into architecture-specific madness), so use CAS. */
@@ -138,7 +167,7 @@ static inline void InterlockedWrite16(volatile gint16 *dst, gint16 val)
        mono_memory_barrier ();
 }
 
-/* Prefer GCC atomic ops if the target supports it (see configure.in). */
+/* Prefer GCC atomic ops if the target supports it (see configure.ac). */
 #elif defined(USE_GCC_ATOMIC_OPS)
 
 static inline gint32 InterlockedCompareExchange(volatile gint32 *dest,