wsc - Is the RegExp object in VBScript Thread Safe when used inside a Windows Scripting Component -

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i've trying track down issue legacy windows scripting component use. looking @ several memory dumps in windbg have found alot of threads, in fact looks 50% of apps threads waiting thread complete. thread has long stack below. thread doing work regexp object, question regexp thread safe?

it looks isn't other threads waiting on want before jump conclusions , have struggled find real information online.

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

i don't know thread safety in case. but, looking @ situation, i'd it's more problem in regex itself. first thing at. it's possible create regex causes stack overflow, or very long runtime, because of quantifiers , re-starts.

from the pcre man page: 

   when pattern contains unlimited repeat inside   subpattern     can    repeated   unlimited number of times, use of    atomic group way avoid  failing  matches  taking     long time indeed. pattern       (\d+|<\d+>)*[!?]     matches   unlimited number of substrings either consist of non-    digits, or digits enclosed in <>, followed either ! or  ?.  when     matches, runs quickly. however, if applied       aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa      takes   long  time  before reporting failure. because    string can divided between internal \d+ repeat ,  external    *  repeat  in   large  number of ways, , have tried. (the    example uses [!?] rather single character @   end,  because    both  pcre  ,  perl have optimization allows fast failure    when single character used. remember last single  charac-    ter   required match, , fail if not present    in string.)

now, regexp object available in windows script host not pcre, believe same behavior have apply it.

so, check regex nested unlimited quantifiers.


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