6

FileStream を使用してファイルに書き込み、基になるシステム コールをProcess Monitorを使用して監視しています。実稼働環境でのファイル ロックの問題で問題が発生しているため、詳細を詳しく調べています。

このサンプル コード:

        using (FileStream fs = new FileStream("c:\\temp\\test.txt", FileMode.Create, FileAccess.Write, FileShare.Read))
        {
            fs.Write(new byte[] { 1, 2, 3, 4, 5 }, 0, 5);
            fs.Close();
        }

次のシステム コールを引き起こします。

9:27:09.4561092 AM  ConsoleApplication1.vshost.exe  2320    CreateFile  C:\temp\test.txt    SUCCESS Desired Access: Generic Read/Write, Disposition: OverwriteIf, Options: Synchronous IO Non-Alert, Non-Directory File, Open No Recall, Attributes: n/a, ShareMode: Read, AllocationSize: 0, OpenResult: Overwritten
9:27:12.2217409 AM  ConsoleApplication1.vshost.exe  2320    WriteFile   C:\temp\test.txt    SUCCESS Offset: 0, Length: 5
9:27:12.2219901 AM  ConsoleApplication1.vshost.exe  2320    CloseFile   C:\temp\test.txt    SUCCESS 
9:27:12.2234484 AM  ConsoleApplication1.vshost.exe  2320    CreateFile  C:\temp\test.txt    SUCCESS Desired Access: Generic Read, Write Attributes, Disposition: Open, Options: Synchronous IO Non-Alert, Non-Directory File, Complete If Oplocked, Random Access, Attributes: N, ShareMode: Read, Write, Delete, AllocationSize: n/a, OpenResult: Opened
9:27:12.2248664 AM  ConsoleApplication1.vshost.exe  2320    QueryBasicInformationFile   C:\temp\test.txt    SUCCESS CreationTime: 10/29/2008 9:04:14 AM, LastAccessTime: 10/29/2008 9:27:12 AM, LastWriteTime: 10/29/2008 9:27:12 AM, ChangeTime: 10/29/2008 9:27:12 AM, FileAttributes: A
9:27:12.2250075 AM  ConsoleApplication1.vshost.exe  2320    SetBasicInformationFile C:\temp\test.txt    SUCCESS CreationTime: -1, LastAccessTime: -1, LastWriteTime: -1, ChangeTime: -1, FileAttributes: n/a
9:27:12.2255889 AM  ConsoleApplication1.vshost.exe  2320    QueryStandardInformationFile    C:\temp\test.txt    SUCCESS AllocationSize: 8, EndOfFile: 5, NumberOfLinks: 1, DeletePending: False, Directory: False
9:27:12.2257571 AM  ConsoleApplication1.vshost.exe  2320    ReadFile    C:\temp\test.txt    SUCCESS Offset: 0, Length: 5
9:27:12.2259825 AM  ConsoleApplication1.vshost.exe  2320    ReadFile    C:\temp\test.txt    SUCCESS Offset: 0, Length: 5
9:27:12.2261588 AM  ConsoleApplication1.vshost.exe  2320    ReadFile    C:\temp\test.txt    SUCCESS Offset: 0, Length: 5
9:27:12.2265161 AM  ConsoleApplication1.vshost.exe  2320    ReadFile    C:\temp\test.txt    SUCCESS Offset: 0, Length: 2
9:27:12.2268237 AM  ConsoleApplication1.vshost.exe  2320    ReadFile    C:\temp\test.txt    SUCCESS Offset: 0, Length: 5
9:27:12.2271332 AM  ConsoleApplication1.vshost.exe  2320    ReadFile    C:\temp\test.txt    SUCCESS Offset: 0, Length: 5
9:27:12.2272841 AM  ConsoleApplication1.vshost.exe  2320    ReadFile    C:\temp\test.txt    SUCCESS Offset: 0, Length: 5
9:27:12.2274779 AM  ConsoleApplication1.vshost.exe  2320    ReadFile    C:\temp\test.txt    SUCCESS Offset: 0, Length: 5
9:27:12.2276249 AM  ConsoleApplication1.vshost.exe  2320    ReadFile    C:\temp\test.txt    SUCCESS Offset: 0, Length: 5
9:27:12.2278766 AM  ConsoleApplication1.vshost.exe  2320    ReadFile    C:\temp\test.txt    SUCCESS Offset: 0, Length: 5
9:27:12.2282577 AM  ConsoleApplication1.vshost.exe  2320    ReadFile    C:\temp\test.txt    SUCCESS Offset: 0, Length: 5
9:27:12.2284476 AM  ConsoleApplication1.vshost.exe  2320    QueryFileInternalInformationFile    C:\temp\test.txt    SUCCESS IndexNumber: 0x2d000000016b88
9:27:12.2286183 AM  ConsoleApplication1.vshost.exe  2320    CloseFile   C:\temp\test.txt    SUCCESS 
9:27:12.2288759 AM  ConsoleApplication1.vshost.exe  2320    CreateFile  C:\temp\test.txt    SUCCESS Desired Access: Read Attributes, Write Attributes, Disposition: Open, Options: , Attributes: n/a, ShareMode: Read, Write, Delete, AllocationSize: n/a, OpenResult: Opened
9:27:12.2305722 AM  ConsoleApplication1.vshost.exe  2320    QueryBasicInformationFile   C:\temp\test.txt    SUCCESS CreationTime: 10/29/2008 9:04:14 AM, LastAccessTime: 10/29/2008 9:27:12 AM, LastWriteTime: 10/29/2008 9:27:12 AM, ChangeTime: 10/29/2008 9:27:12 AM, FileAttributes: A
9:27:12.2307379 AM  ConsoleApplication1.vshost.exe  2320    CloseFile   C:\temp\test.txt    SUCCESS 

最初の 3 つの IO 呼び出し (作成、書き込み、閉じる) が想定されていますが、プロセスはさらに何十回もファイルを読み取り、開いたり閉じたりを繰り返します。

私は今、Win XP SP2 と Win 2003 x64 でこの動作を確認しました。ただし、自宅の Windows Vista マシンは期待どおりに動作します (最初の 3 行のみ)。

Vista 以外のランタイムでこれが発生する理由についての手がかりはありますか?

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1 に答える 1

6

1 つの可能性は、実行中の各プロセスに自分自身を挿入するウイルス スキャナーがインストールされていることです。

于 2008-10-29T14:26:23.053 に答える