From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Victor Costan <pwnall@chromium.org>
Date: Fri, 23 Nov 2018 10:51:10 -0800
Subject: [PATCH 10/10] Backport Windows VFS mmap fix

Original change: https://www.sqlite.org/src/info/8576ccb479fc4b76

Original change description:
Make the winTruncate() method of the windows VFS be a no-op if there are
outstanding references to the memory-mapped pages. Otherwise, memory
might be deleted out from under those references when the file is
remapped during the truncate operation.

Bug: 897576
---
 third_party/sqlite/src/src/os_win.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/third_party/sqlite/src/src/os_win.c b/third_party/sqlite/src/src/os_win.c
index dfefc4452f02..5cd28a20e427 100644
--- a/third_party/sqlite/src/src/os_win.c
+++ b/third_party/sqlite/src/src/os_win.c
@@ -2906,6 +2906,7 @@ static int winTruncate(sqlite3_file *id, sqlite3_int64 nByte){
   DWORD lastErrno;
 #if SQLITE_MAX_MMAP_SIZE>0
   sqlite3_int64 oldMmapSize;
+  if( pFile->nFetchOut>0 ) return SQLITE_OK;
 #endif

   assert( pFile );
--
2.18.0