DftiErrorClass

Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

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ID 766686

Date 3/31/2023

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DftiErrorClass

Checks whether the status reflects an error of a predefined class.

Syntax

predicate = DftiErrorClass( status, error_class )

Include Files

mkl_dfti.f90

Input Parameters

Name	Type	Description
status	INTEGER	Completion status of a fast Fourier transform (FFT) function.
error_class	INTEGER	Predefined error class.

Output Parameters

Name	Type	Description
predicate	LOGICAL	Result of checking.

Description

The FFT interface in Intel® oneAPI Math Kernel Library provides a set of predefined error classeslisted in Table "Predefined Error Classes". They are named constants and have the type INTEGER.

Predefined Error Classes
Named Constants	Comments
`DFTI_NO_ERROR`	No error. The zero status belongs to this class.
`DFTI_MEMORY_ERROR`	Usually associated with memory allocation.
`DFTI_INVALID_CONFIGURATION`	Invalid settings in one or more configuration parameters.
`DFTI_INCONSISTENT_CONFIGURATION`	Inconsistent configuration or input parameters.
`DFTI_NUMBER_OF_THREADS_ERROR`	Number of OMP threads in the computation function is not equal to the number of OMP threads in the initialization stage (commit function).
`DFTI_MULTITHREADED_ERROR`	Usually associated with a value that OMP routines return in case of errors.
`DFTI_BAD_DESCRIPTOR`	Descriptor is unusable for computation.
`DFTI_UNIMPLEMENTED`	Unimplemented legitimate settings; implementation dependent.
`DFTI_MKL_INTERNAL_ERROR`	Internal library error.
`DFTI_1D_LENGTH_EXCEEDS_INT32`	Length of one of the dimensions exceeds 2³² -1 (4 bytes).
`DFTI_1D_MEMORY_EXCEEDS_INT32`	Data size of one of the transforms exceeds 2³¹ -1 bytes.

NOTE:

Use DFTI_1D_MEMORY_EXCEEDS_INT32 instead of DFTI_1D_LENGTH_EXCEEDS_INT32 for better accuracy.

The DftiErrorClass function returns the value of .TRUE. if the status belongs to the predefined error class. To check whether a function call was successful, call DftiErrorClass with a specific error class. However, the zero value of the status belongs to the DFTI_NO_ERROR class and thus the zero status indicates successful completion of an operation. See Example "Using Status Checking Functions" for an illustration of correct use of the status checking functions.

NOTE:

It is incorrect to directly compare a status with a predefined class.

Interface

 
INTERFACE DftiErrorClass
//Note that the body provided here is to illustrate the different
//argument list and types of dummy arguments. The interface
//does not guarantee what the actual function names are.
//Users can only rely on the function name following the
//keyword INTERFACE
 FUNCTION some_actual_function_8( Status, Error_Class )
 LOGICAL some_actual_function_8
 INTEGER, INTENT(IN) :: Status, Error_Class
 END FUNCTION some_actual_function_8
END INTERFACE DftiErrorClass

Parent topic: Status Checking Functions

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Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

DftiErrorClass