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A change was made in the CLR 20 to make unhandled exceptions on the finalizer thread, thread pool threads, and user created threads exit the process In the CLR 1 X, such exceptions were silently swallowed by the runtime An unhand led exception is more often than not an indication that something wrong has happened and, therefore, the old policy tended to lead to many subtle and hard to diagnose errors Swallowing the exception merely masked a problem that was sure to crop up later in the program's execution At the same time, this change in policy can cause compatibility problems for those migrating from 1 X to 20 and above A configuration setting enables you to recover the 1 X behavior
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< system> < runtime> < legacyUn h a n d l e d E x c eptionPo l i c y e n a b l ed - " l " / > < / runtime> < / system>
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Using this configuration setting is highly discouraged for anything other than as an (one hopes temporary) application compatibility crutch It can create debugging nightmares CLR hosts can also override (some of) this unhand led exception behavior, so what has been described in this sec tion strictly applies only to un hosted managed programs Please refer to Pratschner (see Further Reading) for details on how this is done Some of you might be wondering how the CLR is able to hook itself into the whole Windows unhandled exception process so easily Any user-mode code can install a custom top-level SEH exception filter that will be called instead of the default OS filter when an unhand led exception occurs SetU n h a n d l ed E x c eption F i l t e r installs such a filter
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L PTOP_LEVE L_EXC E PTION_F I LT E R Set U n h a n d led E x c eption F i lt e r ( L PTOP_LEVE L_EXCE PTION_F I LT E R IpTop Leve l E x c eption F ilter
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L PTOP_ L EVE L_EXC E PTIONJ I L T E R is just a function pointer to an ordinary
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LONG WINAPI U n h a n d l e d E x c e pt i on F ilte r ( s t r u c t _EXC E PTION_POINTERS * E x c e p t io n I nfo
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The _ E XC E PT ION_PO I NT E R S data structure is passed by the OS-and is the same value you'd see if you were to call Get E x c e pt i o n I n fo r m a t i o n by hand during exception handling-which provides you with an EXC E PTION_R ECORD and CONTEXT The record provides exception details and the CONTEXT is a collection of the processor 's volatile state (ie, registers) at the time the exception occurred We review contexts later in this chapter As with any filter, this routine can inspect the exception information and decide what to do At the end, it returns EXC E PTION_CONTINU E_S EARCH o r E XC E PT I ON_E X E C UT E_HAND L E R to instruct SEH whether t o execute a handler or not (The details of the CLR and Windows SEH exception systems are fasci nating, but are fairly orthogonal to the topic of concurrency Therefore we won' t review them here, and instead readers are encouraged to read Pietrek (see Further Reading) for a great overview) If you return E XC E PT I ON_CO N T I N U E_S EARCH from this top-level filter, the exception goes completely unhandled and the OS will perform the default unhandled exception behavior That entails showing the dialog (assuming it has not been disabled via S et E r ro rMod e ) and calling E x i t P ro c e s s without unwinding the crashing thread's stack All of this happens during the first pass If you return E XC E PTION_ E X E C UT E_HAN D L E R, however, a special OS-controlled handler is run This SEH handler sits at the base of all threads and will call Exi t P r o c e s s without displaying the standard error dialog And because we have told SEH to execute a han dler, the thread's stack is unwound normally, and, hence, the call to E x i t P r o c e s s occurs during the second pass after finallys blocks have been run
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