From 50e9e0e561555c849ed3373f82e3e4abd29523ae Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=9B=D0=B5=D0=BE=D0=BD=D0=B8=D0=B4=20=D0=AE=D1=80=D1=8C?=
 =?UTF-8?q?=D0=B5=D0=B2=20=28Leonid=20Yuriev=29?= <leo@yuriev.ru>
Date: Wed, 12 Oct 2022 18:00:05 +0300
Subject: [PATCH] mdbx-windows: drop needless `LockFileEx()` inside
 `mdbx_env_copy()` (backport).

---
 src/core.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/src/core.c b/src/core.c
index 71dee172..881b9380 100644
--- a/src/core.c
+++ b/src/core.c
@@ -19853,14 +19853,10 @@ __cold int mdbx_env_copy(MDBX_env *env, const char *dest_path,
 #endif
   );
 
-  if (rc == MDBX_SUCCESS) {
 #if defined(_WIN32) || defined(_WIN64)
-    OVERLAPPED ov;
-    memset(&ov, 0, sizeof(ov));
-    if (!LockFileEx(newfd, LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY,
-                    0, 0, INT32_MAX, &ov))
-      rc = GetLastError();
+  /* no locking required since the file opened with ShareMode == 0 */
 #else
+  if (rc == MDBX_SUCCESS) {
     struct flock lock_op;
     memset(&lock_op, 0, sizeof(lock_op));
     lock_op.l_type = F_WRLCK;
@@ -19875,8 +19871,8 @@ __cold int mdbx_env_copy(MDBX_env *env, const char *dest_path,
 #endif /* Linux */
     )
       rc = errno;
-#endif /* Windows / POSIX */
   }
+#endif /* Windows / POSIX */
 
   if (rc == MDBX_SUCCESS)
     rc = mdbx_env_copy2fd(env, newfd, flags);