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### 5.19 `acc_create` – Allocate device memory and map it to host memory.

Description

  This function allocates device memory and maps it to host memory specified by the host address a with a length of len bytes. In C/C++, the function returns the device address of the allocated device memory.

  In Fortran, two (2) forms are supported. In the first form, a specifies a contiguous array section. The second form a specifies a variable or array element and len specifies the length in bytes.

C/C++:

  Prototype: | `void *acc_create(h_void *a, size_t len);`

Fortran:

  Interface: | `subroutine acc_create(a)`
  | `type, dimension(:[,:]...) :: a`
  Interface: | `subroutine acc_create(a, len)`
  | `type, dimension(:[,:]...) :: a`
  | `integer len`

Reference:

  OpenACC specification v2.0, section 3.2.19.