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