Question

我试图跟踪我们使用的旧版Windows Scripting组件的问题。看看WinDbg中的几个内存转储我发现很多线程，实际上看起来50％的应用程序线程都在等待另一个线程完成。这个线程有一个长堆栈，位于下方。这个线程正在用RegExp对象做一些工作，所以我现在的问题是RegExp线程安全吗？

看起来肯定不是所有其他线程都在等待，但我想在得出结论并努力在网上找到任何真实信息之前确定。

vbscript!RegExpExec::PopGreedyStar+3a    
vbscript!RegExpExec::FExecAux+639    
vbscript!RegExpExec::FExec+1f    
vbscript!RegExpExec::Exec+5a0    
vbscript!RegExpExec::ReplaceUsingString+2d    
vbscript!CRegExp::OrigReplace+14e    
vbscript!CRegExp::Replace+80    
oleaut32!DispCallFunc+16a    
oleaut32!CTypeInfo2::Invoke+234    
vbscript!CRegExp::Invoke+24    
vbscript!IDispatchInvoke2+b2    
vbscript!IDispatchInvoke+59    
vbscript!InvokeDispatch+13a    
vbscript!InvokeByName+42    
vbscript!CScriptRuntime::RunNoEH+22b2    
vbscript!CScriptRuntime::Run+62    
vbscript!CScriptEntryPoint::Call+51    
vbscript!CScriptRuntime::RunNoEH+1e02    
vbscript!CScriptRuntime::Run+62    
vbscript!CScriptEntryPoint::Call+51    
vbscript!CSession::Execute+c8    
vbscript!NameTbl::InvokeEx+516    
scrobj!DoInvoke+2c    
scrobj!NameTable::InvokeEx+e6    
scrobj!ComDispatchEx::InvokeEx+25    
scrobj!DoInvoke+2c    
scrobj!InvokeMember+a3    
scrobj!NameTable::InvokeEx+aa    
scrobj!ComDexHandler::Inner::InvokeEx+25    
vbscript!IDispatchExInvokeEx2+a9    
vbscript!IDispatchExInvokeEx+56    
vbscript!InvokeDispatch+101    
vbscript!InvokeByName+42    
vbscript!CScriptRuntime::RunNoEH+234c    
vbscript!CScriptRuntime::Run+62    
vbscript!CScriptEntryPoint::Call+51    
vbscript!CScriptRuntime::RunNoEH+1bbd    
vbscript!CScriptRuntime::Run+62    
vbscript!CScriptEntryPoint::Call+51    
vbscript!CSession::Execute+c8    
vbscript!NameTbl::InvokeEx+516    
vbscript!IDispatchExInvokeEx2+a9    
vbscript!IDispatchExInvokeEx+56    
vbscript!InvokeDispatch+101    
vbscript!InvokeByName+42    
vbscript!CScriptRuntime::RunNoEH+234c    
vbscript!CScriptRuntime::Run+62    
vbscript!CScriptEntryPoint::Call+51    
vbscript!CScriptRuntime::RunNoEH+1bbd    
vbscript!CScriptRuntime::Run+62    
vbscript!CScriptEntryPoint::Call+51    
vbscript!CScriptRuntime::RunNoEH+1bbd    
vbscript!CScriptRuntime::Run+62    
vbscript!CScriptEntryPoint::Call+51    
vbscript!CScriptRuntime::RunNoEH+1bbd    
vbscript!CScriptRuntime::Run+62    
vbscript!CScriptEntryPoint::Call+51    
vbscript!CSession::Execute+c8    
vbscript!NameTbl::InvokeEx+516    
vbscript!IDispatchExInvokeEx2+a9    
vbscript!IDispatchExInvokeEx+56    
vbscript!InvokeDispatch+101    
vbscript!InvokeByName+42    
vbscript!CScriptRuntime::RunNoEH+234c    
vbscript!CScriptRuntime::Run+62    
vbscript!CScriptEntryPoint::Call+51    
vbscript!CScriptRuntime::RunNoEH+1beb    
vbscript!CScriptRuntime::Run+62    
vbscript!CScriptEntryPoint::Call+51    
vbscript!CSession::Execute+c8    
vbscript!COleScript::ExecutePendingScripts+144    
vbscript!COleScript::SetScriptState+14d

Answer 1

我不知道您的情况下的线程安全性。但是，看看你的情况，我会说它更可能是正则表达式本身的一个问题。这将是我要看的第一件事。由于量词和重新启动，可能会创建一个本身导致堆栈溢出或非常长的运行时的正则表达式。

来自the pcre man page：

   When a pattern contains an unlimited repeat inside  a  subpattern  that
   can  itself  be  repeated  an  unlimited number of times, the use of an
   atomic group is the only way to avoid some  failing  matches  taking  a
   very long time indeed. The pattern

     (\D+|<\d+>)*[!?]

   matches  an  unlimited number of substrings that either consist of non-
   digits, or digits enclosed in <>, followed by either ! or  ?.  When  it
   matches, it runs quickly. However, if it is applied to

     aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

   it  takes  a  long  time  before reporting failure. This is because the
   string can be divided between the internal \D+ repeat and the  external
   *  repeat  in  a  large  number of ways, and all have to be tried. (The
   example uses [!?] rather than a single character at  the  end,  because
   both  PCRE  and  Perl have an optimization that allows for fast failure
   when a single character is used. They remember the last single  charac-
   ter  that  is required for a match, and fail early if it is not present
   in the string.)

现在，Windows脚本宿主中可用的RegExp对象不是pcre，但我相信同样的行为必须适用于它。

因此，检查你的正则表达式嵌套无限量词。

在Windows Scripting组件中使用时，VBScript线程中的RegExp对象是否安全

1 个答案: