le_cdata.h

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#ifndef LEGATO_CDATA_INCLUDE_GUARD
#define LEGATO_CDATA_INCLUDE_GUARD

#ifndef LE_CDATA_COMPONENT_COUNT
    // If legato.h is used in a program built outside of the mktools framework there's only one
    // instance of each component.
#   define LE_CDATA_COMPONENT_COUNT 1
#endif

//--------------------------------------------------------------------------------------------------
//--------------------------------------------------------------------------------------------------
typedef struct
{
    short key;
    short instance;
} _le_cdata_MapEntry_t;
typedef const _le_cdata_MapEntry_t _le_cdata_ThreadRec_t;

#define LE_CDATA_DECLARE(x) static struct x _le_cdata_Instance[LE_CDATA_COMPONENT_COUNT]

#if LE_CDATA_COMPONENT_COUNT == 1
/* Only one instance of this component; macros refer to a simple structure.
 * This is optimized to avoid TLS lookup if there's only one instance of the component,
 * which is the most common case. */
#   define LE_CDATA_THIS    (&_le_cdata_Instance[0])
#else

#   define LE_CDATA_THIS    (&_le_cdata_Instance[le_cdata_GetInstance(LE_CDATA_KEY)])
#endif

unsigned int le_cdata_GetInstance(unsigned int componentKey);

#endif /* LEGATO_CDATA_INCLUDE_GUARD */