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f416a52def
Groundwork for calling the decoders directly from C/C++ threads. To access the timer module timer_module must now be used. Instrumented code need only use the module function 'timer' which is now a procedure pointer that is guaranteed to be associated (unless null() is assigned to it, which should not be done). The default behaviour of 'timer' is to do nothing. If a Fortran program wishes to profile code it should now use the timer_impl module which contains a default timer implementation. The main program should call 'init_timer([filename])' before using 'timer' or calling routines that are instrumented. If 'init_timer([filename])'. If it is called then an optional file name may be provided with 'timer.out' being used as a default. The procedure 'fini_timer()' may be called to close the file. The default timer implementation is thread safe if used with OpenMP multi-threaded code so long as the OpenMP thread team is given the copyin(/timer_private/) attribute for correct operation. The common block /timer_private/ should be included for OpenMP use by including the file 'timer_common.inc'. The module 'lib/timer_C_wrapper.f90' provides a Fortran wrapper along with 'init' and 'fini' subroutines which allow a C/C++ application to call timer instrumented Fortran code and for it to receive callbacks of 'timer()' subroutine invocations. No C/C++ timer implementation is provided at this stage. git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6320 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
58 lines
1.7 KiB
Fortran
58 lines
1.7 KiB
Fortran
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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