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/////////////////////////////////////////////////////////////////////////////
// Name: wx/tls.h
// Purpose: wxTLS_TYPE()
// Author: Vadim Zeitlin
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
/**
Macro to be used for thread-specific variables declarations.
This macro can be used to define thread-specific variables of the specified
@a type. Such variables must be global or static and must be POD, i.e.
not have any constructors or destructor (even implicitly generated by the
compiler due to use of base classes or members which are not POD in a
struct).
Example of use:
@code
struct PerThreadData
{
... data which will be different for every thread ...
};
static wxTLS_TYPE(PerThreadData) s_threadDataVar;
#define s_threadData (wxTLS_VALUE(s_threadDataVar))
... use s_threadData as a variable of type PerThreadData ...
@endcode
Notice that the use of the ugly wxTLS_VALUE() macro is unfortunately
required if you need to support platforms without native compiler support
for thread-specific variables. If you compile your code only on platforms
which do have such support (recent versions of GNU C++ compiler, Microsoft
Visual C++ and Sun C++ compiler are known to have it), you can avoid it and
use the variable directly.
*/
#define wxTLS_TYPE(type) compiler-dependent-implementation
/**
Macro to access thread-specific variables.
This macro is used to hide the difference in implementation of
thread-specific variables under different platforms: they can be of type T
used in wxTLS_TYPE() if they are directly supported by the compiler or of
type emulating @c T @c *, i.e. a pointer to this type otherwise. This macro
always returns an expression of type @c T itself.
As shown in wxTLS_TYPE() example, you may want to @c \#define a symbol
wrapping a thread-specific variable with this macro. And, as also explained
in wxTLS_TYPE() documentation, you may avoid using it entirely if you
target only recent compilers.
@see wxTLS_PTR()
*/
#define wxTLS_VALUE(var)
/**
Macro to return address of a thread-specific variables.
This macro is similar to wxTLS_VALUE() except that it always returns a
pointer to the type of thread-specific variable.
Notice that this is not a constant expression even if the macro is defined
simply as @c &var -- the value returned is still different for every
thread.
*/
#define wxTLS_PTR(var)
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