From: Andres Freund <andres@anarazel.de>
Date: Wed, 3 Dec 2025 23:38:20 +0000 (-0500)
Subject: Add pg_atomic_unlocked_write_u64
X-Git-Url: http://git.postgresql.org/gitweb/static/gitweb.js?a=commitdiff_plain;h=7902a47c20b1d5c0b7d20071f9ada6a0185bf39b;p=postgresql.git

Add pg_atomic_unlocked_write_u64

The 64bit equivalent of pg_atomic_unlocked_write_u32(), to be used in an
upcoming patch converting BufferDesc.state into a 64bit atomic.

Reviewed-by: Melanie Plageman <melanieplageman@gmail.com>
Discussion: https://postgr.es/m/fvfmkr5kk4nyex56ejgxj3uzi63isfxovp2biecb4bspbjrze7@az2pljabhnff
---

diff --git a/src/include/port/atomics.h b/src/include/port/atomics.h
index 96f1858da97..830ea5c7c52 100644
--- a/src/include/port/atomics.h
+++ b/src/include/port/atomics.h
@@ -488,6 +488,16 @@ pg_atomic_write_u64(volatile pg_atomic_uint64 *ptr, uint64 val)
 	pg_atomic_write_u64_impl(ptr, val);
 }
 
+static inline void
+pg_atomic_unlocked_write_u64(volatile pg_atomic_uint64 *ptr, uint64 val)
+{
+#ifndef PG_HAVE_ATOMIC_U64_SIMULATION
+	AssertPointerAlignment(ptr, 8);
+#endif
+
+	pg_atomic_unlocked_write_u64_impl(ptr, val);
+}
+
 static inline void
 pg_atomic_write_membarrier_u64(volatile pg_atomic_uint64 *ptr, uint64 val)
 {
diff --git a/src/include/port/atomics/generic.h b/src/include/port/atomics/generic.h
index 6b61a7b5416..00aa152f908 100644
--- a/src/include/port/atomics/generic.h
+++ b/src/include/port/atomics/generic.h
@@ -297,6 +297,15 @@ pg_atomic_write_u64_impl(volatile pg_atomic_uint64 *ptr, uint64 val)
 #endif /* PG_HAVE_8BYTE_SINGLE_COPY_ATOMICITY && !PG_HAVE_ATOMIC_U64_SIMULATION */
 #endif /* PG_HAVE_ATOMIC_WRITE_U64 */
 
+#ifndef PG_HAVE_ATOMIC_UNLOCKED_WRITE_U64
+#define PG_HAVE_ATOMIC_UNLOCKED_WRITE_U64
+static inline void
+pg_atomic_unlocked_write_u64_impl(volatile pg_atomic_uint64 *ptr, uint64 val)
+{
+	ptr->value = val;
+}
+#endif
+
 #ifndef PG_HAVE_ATOMIC_READ_U64
 #define PG_HAVE_ATOMIC_READ_U64