BSP Developer's Guide

VxWorks 5.5
BSP Developer’s Guide
#ifdef _WRS_GNU_VAR_MACROS /* GNU Syntax */
#define MY_MACRO(x, y, args...) printf (x, y, args)
#else /* ANSI Syntax */
#define MY_MACRO(x, y, ...) printf (x, y, __VA_ARG__)
#endif
In the future, when the GNU toolchain does support the ANSI standard, the
#ifdefs based on this macro can be removed from the code base.
_WRS_ALIGNOF(item)
This macro returns the alignment of the specified item, or item type, in byte units.
Most structures have alignment values of 4, which is the normal alignment of a
longword data value. Data items or types with greater alignment values return an
appropriate alignment value, which is expected to be a power of two (1, 2, 4, 8, 16,
and so on).
_WRS_ALIGN_CHECK(ptr, type)
This macro returns a boolean value, either TRUE or FALSE. A return of TRUE
indicates that the pointer value is sufficiently aligned to be a valid pointer to the
data item or type. The expected implementation is to examine the low-order bits
of the pointer value to see whether it is a proper modulo of the alignment for the
given type.
_WRS_UNALIGNED_COPY(pSrc, pDst, size)
This macro is a compiler-optimized version of the standard Wind River bcopy
operation. It moves a data block from the source location to the destination
location. This macro allows the compiler to optimize the copy operation based on
the data types of the pointers and the size of the block. This macro is designed to
be used in high-performance situations; the size of the block is expected to be
small. Misuse of the macro for other situations should be avoided.
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