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module timer_c_wrapper
use :: iso_c_binding, only: c_ptr
use timer_module, only: timer, null_timer
implicit none
!
! C interoperable callback setup
!
abstract interface
subroutine c_timer_callback (context, dname, k)
use, intrinsic :: iso_c_binding, only: c_ptr, c_char
implicit none
type(c_ptr), value, intent(in) :: context
character(c_char), intent(in) :: dname(*)
integer, intent(in), value :: k
end subroutine c_timer_callback
end interface
public :: init, fini
private
!
! the following are singleton items which assumes that any timer
! implementation should only assume one global instance, probably a
! struct or class object whose address is stored the context below
!
type(c_ptr), private :: the_context
procedure(C_timer_callback), pointer, private :: the_callback
contains
subroutine timer_callback_wrapper (dname, k)
use, intrinsic :: iso_c_binding, only: c_null_char
implicit none
character(len=8), intent(in) :: dname
integer, intent(in) :: k
call the_callback (the_context, trim (dname) // c_null_char, k)
end subroutine timer_callback_wrapper
subroutine init (context, callback)
use, intrinsic :: iso_c_binding, only: c_ptr, c_funptr, c_f_procpointer
use iso_c_utilities, only: c_to_f_string
use timer_module, only: timer
implicit none
type(c_ptr), value, intent(in) :: context
type(c_funptr), value, intent(in) :: callback
the_context=context
call c_f_procpointer (callback, the_callback)
timer => timer_callback_wrapper
end subroutine init
subroutine fini ()
implicit none
timer => null_timer
end subroutine fini
end module timer_c_wrapper
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