cmd/link: implement Msync for Windows using FlushViewOfFile

CL 196846 implemented memory mapped output files but forgot to provide an implementation for Msync. This rectifies that with a simple call to FlushViewOfFile. Change-Id: I5aebef9baf3a2a6ad54ceda096952a5d7d660bfe Reviewed-on: https://go-review.googlesource.com/c/go/+/198418 Run-TryBot: Jason A. Donenfeld <[email protected]> Reviewed-by: Alex Brainman <[email protected]> TryBot-Result: Gobot Gobot <[email protected]>
4a6f656c · Oct 2, 2019 · 274f4ce · 274f4ce
1 parent 148ec3e
commit 274f4ce
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/src/cmd/link/internal/ld/outbuf_windows.go b/src/cmd/link/internal/ld/outbuf_windows.go
@@ -42,6 +42,8 @@ func (out *OutBuf) Munmap() {
 }
 
 func (out *OutBuf) Msync() error {
-	// does nothing on windows
-	return nil
+	if out.buf == nil {
+		return nil
+	}
+	return syscall.FlushViewOfFile(uintptr(unsafe.Pointer(&out.buf[0])), 0)
 }