PANICS in Java

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PANICS
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Panics are used to highlight programming errors by terminating the thread (and, if it is the main thread, the process in which it runs)
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Just-In-Time Debugging
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On the Windows emulator, in debug builds, you can use the User::SetJustInTime() system function to choose whether a panic kills just the thread or the whole emulator By default, just-in-time debugging is enabled and a panic will terminate the entire program and enter the debugger You can disable this by calling User::SetJustInTime(EFalse), whereupon the panic will appear as it does in release builds and simply terminate the thread in which it occurred with an appropriate message box Just-in-time debugging can be re-enabled by calling User::SetJustInTime(ETrue) When just-in-time debugging is enabled, the panic calls a function called ThreadPanicBreakPoint() This function presents the debugger with an information structure which contains information about the ID and name of the thread that panicked, the panic category and reason (which are described shortly), and the name of the thread that caused the panic The function then breaks into the code and launches the debugger within the context of the function that called the panic, using __asm int 3 You can use the debugger to look through the call stack to see where the panic arose and examine the appropriate state There are some subtle differences in behavior between Symbian OS v80, which contains the new hard real-time kernel (known at the time of going to press as EKA2 , which stands for EPOC Kernel Architecture 2 ) and previous releases of Symbian OS (EKA1)
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Panics on EKA1
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A call to the static function User::Panic() panics the currently running thread A thread may panic any other thread in the system by acquiring an RThread handle to it (as discussed in 10) and calling RThread::Panic() Both functions take two parameters: a panic category string, which is limited to 16 characters, and an error code, expressed as a TInt
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Panics on EKA2
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A call to the static function User::Panic() panics the currently running thread A thread may panic any thread in the same process by calling RThread::Panic(), but can no longer panic threads in any other
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process2 The panic functions take a panic category string, which can contain an unlimited number of characters, and an error code, expressed, as usual, as a TInt
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Even without breaking into the debugger, you should still be able to track down the cause of a panic using the panic category string and error number It s good style to make your panic category string descriptive and unique, so other developers can locate the string in your header les, and with it, any associated panic error codes (which should also have suitably descriptive names) Thus, you might have a general panic header le for your library which includes the following:
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// ClangerPanich #ifndef __CLANGERPANIC_H__ #define __CLANGERPANIC_H__ #include <e32baseh> _LIT(KClangerPanic, "CLANGER-ENGINE"); enum TClangerEnginePanic { ECorruptBlueStringPudding, // =0, EIronChickenNotInitialized,// =1, EInvalidClangerSetting // =2 }; static void Panic(TClangerEnginePanic aCategory); #endif // __CLANGERPANIC_H__
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Which de nes the Panic() function separately as follows:
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static void Panic(TClangerEnginePanic aCategory) { User::Panic(KClangerPanic, aCategory); }
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(You ll notice by the way that the panic enumeration is a T Class because an enumeration is a type 1 discusses the differences between class types on Symbian OS and how to use them) When the library code is passed invalid arguments, it may invoke Panic() with the appropriate error code, resulting in a panic and
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Except where a server thread uses RMessagePtr to panic a misbehaving client thread
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PANICS
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termination of the thread in which it is running The category and error will be reported, and may then be traced back by searching the library s header les for "CLANGER-ENGINE", located inside ClangerPanich You ll see I ve commented each error s enum value with its associated number, just to make the lookup easier I ve tried to give each a descriptive name, though obviously they could be further documented, using in-source comments, for clarity Of course, if a client programmer has access to the source code for clangerdll, they can also search it for calls to Panic() which use a particular error value, to track down where a panic originated
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