From 2be55f5c0576ae2b718fe9ad9dfd4f543ee8cef7 Mon Sep 17 00:00:00 2001
From: Mark Andrews <marka@isc.org>
Date: Tue, 15 Jan 2019 11:35:40 +1100
Subject: [PATCH] use smt_pause instead of pause on sparc

---
 CHANGES          | 2 ++
 lib/isc/rwlock.c | 6 ++++++
 2 files changed, 8 insertions(+)

diff --git a/CHANGES b/CHANGES
index 15d5b1a1c6..66e168828e 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,5 @@
+5135.	[port]		sparc: Use smt_pause() instead of pause. [GL #816]
+
 5134.	[bug]		win32: WSAStartup was not called before getservbyname
 			was called. [GL #590]
 
diff --git a/lib/isc/rwlock.c b/lib/isc/rwlock.c
index 8b3f2b5988..b6b2456cd5 100644
--- a/lib/isc/rwlock.c
+++ b/lib/isc/rwlock.c
@@ -18,6 +18,10 @@
 #include <stddef.h>
 #include <inttypes.h>
 
+#if defined(sun) && (defined(__sparc) || defined(__sparc__))
+#include <synch.h> /* for smt_pause(3c) */
+#endif
+
 #include <isc/atomic.h>
 #include <isc/magic.h>
 #include <isc/platform.h>
@@ -52,6 +56,8 @@
 # define isc_rwlock_pause() __asm__ __volatile__ ("hint @pause")
 #elif defined(__arm__)
 # define isc_rwlock_pause() __asm__ __volatile__ ("yield")
+#elif defined(sun) && (defined(__sparc) || defined(__sparc__))
+# define isc_rwlock_pause() smt_pause()
 #elif defined(__sparc) || defined(__sparc__)
 # define isc_rwlock_pause() __asm__ __volatile__ ("pause")
 #elif defined(__ppc__) || defined(_ARCH_PPC)  ||			\