[mono/mono] 80f7e1f1: Add InterlockedExchange64 () based on GCC intrinsics for MinGW.

   Branch: refs/heads/master
     Home: https://github.com/mono/mono
  Compare: https://github.com/mono/mono/compare/f9bbb7c58bed...80f7e1f15b33

   Commit: 80f7e1f15b33826a6145899497954297633cee92
   Author: Alex Rønne Petersen <[email protected]> 
     Date: 2013-10-23 13:06:09 GMT
      URL: https://github.com/mono/mono/commit/80f7e1f15b33826a6145899497954297633cee92

Add InterlockedExchange64 () based on GCC intrinsics for MinGW.

As with InterlockedCompareExchange64, MinGW appears to lack this
one from its Windows headers.

Changed paths:
  M configure.in
  M mono/utils/atomic.h

Modified: configure.in
===================================================================
@@ -2131,6 +2131,7 @@ else
 		])
 	])
 	AC_CHECK_FUNCS(GetProcessId)
+	AC_CHECK_DECLS(InterlockedExchange64, [], [], [[#include <windows.h>]])
 	AC_CHECK_DECLS(InterlockedCompareExchange64, [], [], [[#include <windows.h>]])
 fi
 

Modified: mono/utils/atomic.h
===================================================================
@@ -31,6 +31,18 @@ static inline gint64 InterlockedCompareExchange64(volatile gint64 *dest, gint64
 }
 #endif
 
+/* mingw is missing InterlockedExchange64 () from winbase.h */
+#if HAVE_DECL_INTERLOCKEDEXCHANGE64==0
+static inline gint64 InterlockedExchange64(volatile gint64 *val, gint64 new_val)
+{
+	gint64 old_val;
+	do {
+		old_val = *val;
+	} while (InterlockedCompareExchange64 (val, new_val, old_val) != old_val);
+	return old_val;
+}
+#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. */
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