From 4f10bb74f7ace5391321460b385e95f827bdac00 Mon Sep 17 00:00:00 2001
From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Sun, 28 Aug 2005 18:26:07 +0000
Subject: [PATCH] Add a SYNC instruction to the S_UNLOCK sequence for MIPS.

---
 src/include/storage/s_lock.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/include/storage/s_lock.h b/src/include/storage/s_lock.h
index 4acd652a3f..29e071440b 100644
--- a/src/include/storage/s_lock.h
+++ b/src/include/storage/s_lock.h
@@ -487,6 +487,14 @@ tas(volatile slock_t *lock)
 	return _res;
 }
 
+/* MIPS S_UNLOCK is almost standard but requires a "sync" instruction */
+#define S_UNLOCK(lock)	\
+do \
+{\
+	__asm__ __volatile__ ("	sync \n"); \
+	*((volatile slock_t *) (lock)) = 0; \
+} while (0)
+
 #endif /* __mips__ && !__sgi */
 
 
-- 
2.39.5