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CTaskManager:: CTaskManager() { if (iTasks) { iTasks->Close(); delete iTasks; } }
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The implementation works well in an EXE component, but because of its use of writable static data cannot be used in a DLL If writable global data is used inadvertently, it returns an error at build time for ARM targets, emitting a message from the PETRAN tool similar to the following:
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ERROR: Dll 'TASKMANAGER[1000C001]DLL' has uninitialised data
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The only global data you can use with DLLs is constant global data of the built-in types, or of a class with no constructor Thus while you may have constant global data such as this in a DLL:
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static const TUid KUidClangerDll = { 0x1000C001 }; static const TInt KMinimumPasswordLength = 6;
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You cannot use these:
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static const TPoint KGlobalStartingPoint(50, 50); // This literal type is deprecated (see 5) static const TPtrC KDefaultInput =_L(""); static const TChar KExclamation('!');
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The reason for this is the presence of a non-trivial class constructor, which requires the objects to be constructed at runtime This means that, although the memory for the object is pre-allocated in code, it doesn t actually become initialized and const until after the constructor has run Thus, at build time, each constitutes a non-constant global object and causes the DLL build to fail for target hardware Note that the following object is also non-constant because, although the data pointed to by pClanger is constant, the pointer itself is not constant:
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// Writable static data! static const TText* pClanger = (const TText*)"clanger";
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This can be corrected as follows:
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// pClanger is constant static const TText* const pClanger = (const TText*)"clanger";
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THREAD-LOCAL STORAGE
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Incidentally, the issue of not allowing non-constant global data in DLLs highlights another difference between the behavior of Windows emulator builds and builds for target hardware The emulator can use underlying Windows DLL mechanisms to provide per-process DLL data If you do inadvertently use non-constant global data in your code, it will go undetected on emulator builds and will only fail when building for target hardware Symbian OS DLLs must not contain writable global or static data The only global data which may be used are constants, either of the built-in types or of classes with no constructor
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134 Thread-Local Storage
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As I mentioned, the lack of writable global data in DLLs can be dif cult when you are porting code to run on Symbian OS However, the operating system does provide a mechanism whereby a DLL can manage writable static data on a per-thread basis using thread-local storage, commonly known as TLS This allocates a single machine word of writable static data per thread for every DLL, regardless of whether the DLL uses it Obviously, the memory overhead is far less signi cant than allocating a 4 KB chunk for each DLL which uses static data However, the price of using TLS instead of direct memory access is performance; data is retrieved from TLS about 30 times slower than direct access, because the lookup involves a context switch to the kernel in order to access the data The use of TLS for per-thread access to global static data is safe because it avoids complications when the DLL is loaded into multiple processes However, for writable static data to be used by multiple threads, this approach must be extended One technique uses a server to store the data, which has the bene t of being able to use static data without the need for TLS, because it is a process The server can make this data available to its clients, which may run in multiple threads3 Of course, the inter-process context switch required to access the server also has performance implications, as I discuss in 11 The TLS slot can be used directly if you have only one machine word of data to store For extensibility, it is more likely that you ll use it to store a pointer to a struct or simple T Class which encapsulates all the data you would otherwise have declared as static Thread-local storage is usually initialized when the DLL is attached to a thread within the DLL entry point, E32Dll() Typically, code is
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3 You can nd an example of this technique in the EpocStat product released by Peroon (wwwperooncom/Downloadshtml), for which full source code is available for download
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