1 files changed, 21 insertions, 0 deletions
diff --git a/src/util/HugeAllocator.hxx b/src/util/HugeAllocator.hxx
index 46b65e29a..421cf7da4 100644
--- a/src/util/HugeAllocator.hxx
+++ b/src/util/HugeAllocator.hxx
@@ -57,6 +57,13 @@ void
 HugeFree(void *p, size_t size) noexcept;
 
 /**
+ * Control whether this allocation is copied to newly forked child
+ * processes.  Disabling that makes forking a little bit cheaper.
+ */
+void
+HugeForkCow(void *p, size_t size, bool enable) noexcept;
+
+/**
  * Discard any data stored in the allocation and give the memory back
  * to the kernel.  After returning, the allocation still exists and
  * can be reused at any time, but its contents are undefined.
@@ -81,6 +88,11 @@ HugeFree(void *p, gcc_unused size_t size) noexcept
 }
 
 static inline void
+HugeForkCow(void *, size_t, bool) noexcept
+{
+}
+
+static inline void
 HugeDiscard(void *p, size_t size) noexcept
 {
 	VirtualAlloc(p, size, MEM_RESET, PAGE_NOACCESS);
@@ -107,6 +119,11 @@ HugeFree(void *_p, size_t) noexcept
 }
 
 static inline void
+HugeForkCow(void *, size_t, bool) noexcept
+{
+}
+
+static inline void
 HugeDiscard(void *, size_t) noexcept
 {
 }
@@ -140,6 +157,10 @@ public:
 		return *this;
 	}
 
+	void ForkCow(bool enable) noexcept {
+		HugeForkCow(data, size, enable);
+	}
+
 	void Discard() noexcept {
 		HugeDiscard(data, size);
 	}