u_atomic: Implement p_atomic_xchg for Windows

Reviewed-by: Yonggang Luo <luoyonggang@gmail.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17529>

diff --git a/src/util/u_atomic.h b/src/util/u_atomic.h
index c1936a5..f9570e8 100644 (file)
--- a/src/util/u_atomic.h
+++ b/src/util/u_atomic.h
@@ -166,6 +166,12 @@
    sizeof *(_v) == sizeof(__int64) ? InterlockedCompareExchange64 ((__int64 *)(_v), (__int64)(_new), (__int64)(_old)) : \
                                      (assert(!"should not get here"), 0))
 
+#define PIPE_NATIVE_ATOMIC_XCHG
+#define p_atomic_xchg(_v, _new) (\
+   sizeof *(_v) == sizeof(long)    ? InterlockedExchange  ((long *)   (_v), (long)   (_new)) : \
+   sizeof *(_v) == sizeof(__int64) ? InterlockedExchange64((__int64 *)(_v), (__int64)(_new)) : \
+                                     (assert(!"should not get here"), 0))
+
 #endif
 
 #if defined(PIPE_ATOMIC_OS_SOLARIS)