System configuration¶
When NumPy is built, information about system configuration is
recorded, and is made available for extension modules using NumPy’s C
API. These are mostly defined in numpyconfig.h (included in
ndarrayobject.h). The public symbols are prefixed by NPY_*.
NumPy also offers some functions for querying information about the
platform in use.
For private use, NumPy also constructs a config.h in the NumPy
include directory, which is not exported by NumPy (that is a python
extension which use the numpy C API will not see those symbols), to
avoid namespace pollution.
Data type sizes¶
The NPY_SIZEOF_{CTYPE} constants are defined so that sizeof
information is available to the pre-processor.
-
NPY_SIZEOF_SHORT sizeof(short)
-
NPY_SIZEOF_INT sizeof(int)
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NPY_SIZEOF_LONG sizeof(long)
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NPY_SIZEOF_LONGLONG sizeof(longlong) where longlong is defined appropriately on the platform.
-
NPY_SIZEOF_PY_LONG_LONG
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NPY_SIZEOF_FLOAT sizeof(float)
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NPY_SIZEOF_DOUBLE sizeof(double)
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NPY_SIZEOF_LONG_DOUBLE sizeof(longdouble) (A macro defines NPY_SIZEOF_LONGDOUBLE as well.)
-
NPY_SIZEOF_PY_INTPTR_T Size of a pointer on this platform (sizeof(void *)) (A macro defines NPY_SIZEOF_INTP as well.)
Platform information¶
-
NPY_CPU_X86
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NPY_CPU_AMD64
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NPY_CPU_IA64
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NPY_CPU_PPC
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NPY_CPU_PPC64
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NPY_CPU_SPARC
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NPY_CPU_SPARC64
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NPY_CPU_S390
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NPY_CPU_PARISC New in version 1.3.0.
CPU architecture of the platform; only one of the above is defined.
Defined in
numpy/npy_cpu.h
-
NPY_LITTLE_ENDIAN
-
NPY_BIG_ENDIAN
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NPY_BYTE_ORDER New in version 1.3.0.
Portable alternatives to the
endian.hmacros of GNU Libc. If big endian,NPY_BYTE_ORDER==NPY_BIG_ENDIAN, and similarly for little endian architectures.Defined in
numpy/npy_endian.h.
-
PyArray_GetEndianness() New in version 1.3.0.
Returns the endianness of the current platform. One of
NPY_CPU_BIG,NPY_CPU_LITTLE, orNPY_CPU_UNKNOWN_ENDIAN.
Interrupt Handling¶
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NPY_INTERRUPT_H
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NPY_SIGSETJMP
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NPY_SIGLONGJMP
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NPY_SIGJMP_BUF
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NPY_SIGINT_ON
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NPY_SIGINT_OFF