vb.net - Threading Exception: The number of WaitHandles must be less than or equal to 64 -

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the title make easy find others having error. i'm new threading, giving me heck. i'm getting runtime error crashed cassini. code i'm maintaining developed website project in vs 2003 , converted vs 2008 website project.

important info:

  • the number of objects in manualevents array 128 in case.
  • products array of strings
  • need support .net 2.0
for each product string in products     if not product.trim().toupper().endswith("obsolete")         calls += 1     end if next dim results(calls - 1) downloadresults 'dim manualevents(calls - 1) threading.manualresetevent '128 objects in case. dim manualevents(0) threading.manualresetevent manualevents(0) = new threading.manualresetevent(false) 'note: don't think work because not seen here, '    code being used populate , cache long list of products, '    each own category, etc. misunderstanding something?  'initialize results structures 'spawn background workers calls = 0 each product string in products     if not product.trim().toupper().endswith("obsolete")         dim result new downloadresults          'manualevents(calls) = new threading.manualresetevent(false)         'moved above each after declaration of variable          result.params.product = product         result.params.category = doctype         'result.manualevent = manualevents(calls)         result.manualevent = manualevents(0)         result.context = me._context          results(calls) = result          threading.threadpool.queueuserworkitem(addressof processsinglecategoryproduct, results(calls))         threading.interlocked.increment(calls) 'replaces below incrementation          'calls += 1     end if next  threading.waithandle.waitall(manualevents) 'crashes here

thread helper function (for sake of completion)

public shared sub processsinglecategoryproduct(byval state object)     dim drs downloadresults = ctype(state, downloadresults)     dim adc new cadcwebservice(drs.context)      drs.docs = adc.downloadadc(drs.params.category, drs.params.product)     drs.manualevent.set() end sub

you don't need array of 128 manual events check completion of 128 threads.

create 1 manual reset event , plain integer starting @ 128. decrement integer using interlocked.decrement @ end of processsinglecategoryproduct, , signal event when count reaches zero:

if (interlocked.decrement(byref mycounter) = 0) myevent.set();

then declare 1 threading.manualresetevent opposed array of them, , can call waitone instead of waitall on it, , done.

see usr's comment easier alternative in case have .net 4.


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