Merge branch 'upstream-librhash' into import-librhash

* upstream-librhash:
  librhash 2016-11-01 (d839a1a8)

1 files changed, 31 insertions, 0 deletions

diff --git a/Utilities/cmlibrhash/librhash/util.h b/Utilities/cmlibrhash/librhash/util.h
new file mode 100644
index 0000000..9f37157
--- /dev/null
+++ b/Utilities/cmlibrhash/librhash/util.h
@@ -0,0 +1,31 @@
+/* util.h */
+#ifndef UTIL_H
+#define UTIL_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if (defined(__GNUC__) && __GNUC__ >= 4 && (__GNUC__ > 4 || __GNUC_MINOR__ >= 1) \
+	&& defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4)) \
+	|| (defined(__INTEL_COMPILER) && !defined(_WIN32))
+/* atomic operations are defined by ICC and GCC >= 4.1, but by the later one supposedly not for ARM */
+/* note: ICC on ia64 platform possibly require ia64intrin.h, need testing */
+# define atomic_compare_and_swap(ptr, oldval, newval) __sync_val_compare_and_swap(ptr, oldval, newval)
+#elif defined(_MSC_VER)
+# include <windows.h>
+# define atomic_compare_and_swap(ptr, oldval, newval) InterlockedCompareExchange(ptr, newval, oldval)
+#elif defined(__sun)
+# include <atomic.h>
+# define atomic_compare_and_swap(ptr, oldval, newval) atomic_cas_32(ptr, oldval, newval)
+#else
+/* pray that it will work */
+# define atomic_compare_and_swap(ptr, oldval, newval) { if(*(ptr) == (oldval)) *(ptr) = (newval); }
+# define NO_ATOMIC_BUILTINS
+#endif
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif /* __cplusplus */
+
+#endif /* UTIL_H */