将fortran的可分配数组传递给C和malloc [英] Passing allocatable array from fortran to C and malloc it
问题描述
我将一些Fortran库代码转换为C,以便我们最终拥有Fortran包装器的C函数。我们使用Fortran 95.
处理可分配数组的首选方法是什么?
-
我可以将可分配数组传递给C函数,并将它放到C函数中吗?
(C函数知道大小被malloc化了) -
在fortran程序中,我可以释放C中的某些东西吗?功能?
最后,客户端Fortran应用程序释放数组,或者需要调用一个释放内存的C函数。 Can I pass an allocatable array to a C function and malloc it inside the C function? (The C function knows the size to be malloc'ed)
In the fortran program, can I deallocate something that was malloced in a C function? So finally either the client fortran application deallocates the array or is required to call a C function that frees the memory.
一个很小的例子或者一个链接将会被高度赞赏。
在Fortran 95中,传递可分配数组作为可分配事物,包括Fortran过程。
在Fortran 2003中,C函数可以为数组存储malloc,然后将其返回给Fortran方面作为来自ISO_C_BINDING内在模块的C_PTR。然后可以使用Fortran POINTER和ISO_C_BINDING模块中的C_F_POINTER过程访问C_PTR指向的存储。
要释放数组的存储空间,Fortran端将再次调用一个C程序,传递C_PTR,C函数随后将在调用中使用以释放它。
#include stdlib.h
int * create_storage()
{
/ *由四个整数组成的数组。 * /
return malloc(sizeof(int)* 4);
}
void destroy_storage(int * ptr)
{
free(ptr);
}
程序fortran_side
USE,INTRINSIC :: ISO_C_BINDING,仅:C_PTR,C_F_POINTER,C_INT
隐式无
INTERFACE
FUNCTION create_storage()BIND(C,NAME ='create_storage')
USE,INTRINSIC :: ISO_C_BINDING,仅:C_PTR
IMPLICIT NONE
TYPE(C_PTR):: create_storage
END FUNCTION create_storage $ b $ SUBROUTINE destroy_storage(p)BIND(C,NAME ='destroy_storage')
USE,INTRINSIC :: ISO_C_BINDING,仅:C_PTR
IMPLICIT NONE
TYPE(C_PTR ),INTENT(IN),VALUE :: p
END SUBROUTINE destroy_storage
END INTERFACE
TYPE(C_PTR):: p
INTEGER(C_INT),POINTER :: array(: )
!****
p = create_storage()
CALL C_F_POINTER(p,array,[4])! 4是数组大小。
!使用数组...
CALL destroy_storage(p)
END PROGRAM fortran_side
在Fortran 201X中,可以提供C头文件和函数以允许C直接与Fortran可分配变量一起工作。
I am converting some of our Fortran library code into C so that we finally have C functions with Fortran wrappers around it. We are using Fortran 95.
What is the preferred way to handle allocatable arrays?
A small example or a link to one would be highly appreciated.
In Fortran 95 you can't "pass" allocatable arrays as an allocatable thing to anything, including Fortran procedures.
In Fortran 2003, the C function can malloc storage for the array, and then return that to the Fortran side as a C_PTR from the ISO_C_BINDING intrinsic module. The storage pointed to by the C_PTR can then be accessed using a Fortran POINTER and the C_F_POINTER procedure from the ISO_C_BINDING module.
To free the storage for the array, the Fortran side would again call into a C procedure, passing the C_PTR, which the C function then uses in a call to free.
#include "stdlib.h"
int *create_storage()
{
/* Array of four integers. */
return malloc(sizeof(int) * 4);
}
void destroy_storage(int *ptr)
{
free(ptr);
}
PROGRAM fortran_side
USE, INTRINSIC :: ISO_C_BINDING, ONLY: C_PTR, C_F_POINTER, C_INT
IMPLICIT NONE
INTERFACE
FUNCTION create_storage() BIND(C, NAME='create_storage')
USE, INTRINSIC :: ISO_C_BINDING, ONLY: C_PTR
IMPLICIT NONE
TYPE(C_PTR) :: create_storage
END FUNCTION create_storage
SUBROUTINE destroy_storage(p) BIND(C, NAME='destroy_storage')
USE, INTRINSIC :: ISO_C_BINDING, ONLY: C_PTR
IMPLICIT NONE
TYPE(C_PTR), INTENT(IN), VALUE :: p
END SUBROUTINE destroy_storage
END INTERFACE
TYPE(C_PTR) :: p
INTEGER(C_INT), POINTER :: array(:)
!****
p = create_storage()
CALL C_F_POINTER(p, array, [4]) ! 4 is the array size.
! Work with array...
CALL destroy_storage(p)
END PROGRAM fortran_side
In Fortran 201X, C header files and functions may be provided to allow C to work directly with Fortran allocatable variables.
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