From 3b7f995b75cb75427199dfe6978c4248a6909aff Mon Sep 17 00:00:00 2001
From: NAKAMURA Takumi <geek4civic@gmail.com>
Date: Tue, 8 May 2012 14:31:46 +0000
Subject: Windows/PathV2.inc: Retry rename() for (maximum) 2 seconds.

Files might be opend by system scanners (eg. file indexer, virus scanner, &c).

llvm-svn: 156380
---
 llvm/lib/Support/Windows/PathV2.inc | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

(limited to 'llvm')

diff --git a/llvm/lib/Support/Windows/PathV2.inc b/llvm/lib/Support/Windows/PathV2.inc
index e9ce5d9097a..66b8d84f852 100644
--- a/llvm/lib/Support/Windows/PathV2.inc
+++ b/llvm/lib/Support/Windows/PathV2.inc
@@ -301,11 +301,21 @@ error_code rename(const Twine &from, const Twine &to) {
   if (error_code ec = UTF8ToUTF16(f, wide_from)) return ec;
   if (error_code ec = UTF8ToUTF16(t, wide_to)) return ec;
 
-  if (!::MoveFileExW(wide_from.begin(), wide_to.begin(),
-                     MOVEFILE_COPY_ALLOWED | MOVEFILE_REPLACE_EXISTING))
-    return windows_error(::GetLastError());
+  error_code ec = error_code::success();
+  for (int i = 0; i < 2000; i++) {
+    if (::MoveFileExW(wide_from.begin(), wide_to.begin(),
+                      MOVEFILE_COPY_ALLOWED | MOVEFILE_REPLACE_EXISTING))
+      return error_code::success();
+    ec = windows_error(::GetLastError());
+    if (ec != windows_error::access_denied)
+      break;
+    // Retry MoveFile() at ACCESS_DENIED.
+    // System scanners (eg. indexer) might open the source file when
+    // It is written and closed.
+    ::Sleep(1);
+  }
 
-  return error_code::success();
+  return ec;
 }
 
 error_code resize_file(const Twine &path, uint64_t size) {
-- 
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