Update interface of prif_init based on latest design doc choices.

example/hello.f90

@@ -2,9 +2,10 @@ program hello_world
   use prif, only : prif_init, this_image => prif_this_image, num_images => prif_num_images, prif_stop
   implicit none
 
-  integer :: me, num_imgs
+  integer :: init_exit_code, me, num_imgs
 
-  if (prif_init() /= 0) error stop "caffeinate returned a non-zero exit code"
+  call prif_init(init_exit_code)
+  if (init_exit_code /= 0) error stop "caffeinate returned a non-zero exit code"
 
   call this_image(image_index=me)
   call num_images(image_count=num_imgs)

example/support-test/error_stop_character_code.f90

@@ -2,7 +2,10 @@ program error_stop_character_code
   use prif, only : prif_init, prif_error_stop
   implicit none
 
-  if (prif_init() /= 0) error stop "caffeinate returned a non-zero exit_code"
+  integer :: init_exit_code
+
+  call prif_init(init_exit_code)
+  if (init_exit_code /= 0) error stop "caffeinate returned a non-zero exit_code"
 
   call prif_error_stop(stop_code_char="Oh snap!")
 

example/support-test/error_stop_integer_code.f90

@@ -2,7 +2,10 @@ program error_stop_integer_code
   use prif, only : prif_init, prif_error_stop
   implicit none
 
-  if (prif_init() /= 0) error stop "caffeinate returned a non-zero exit_code"
+  integer :: init_exit_code
+
+  call prif_init(init_exit_code)
+  if (init_exit_code /= 0) error stop "caffeinate returned a non-zero exit_code"
 
   call prif_error_stop(1)
 

example/support-test/stop_with_integer_code.f90

@@ -2,7 +2,10 @@ program stop_with_no_code
   use prif, only : prif_init, prif_stop
   implicit none
 
-  if (prif_init() /= 0) error stop "caffeinate returned a non-zero exit_code"
+  integer :: init_exit_code
+
+  call prif_init(init_exit_code)
+  if (init_exit_code /= 0) error stop "caffeinate returned a non-zero exit_code"
 
   call prif_stop(1)
 

example/support-test/stop_with_no_code.f90

@@ -2,7 +2,10 @@ program stop_with_no_code
   use prif, only : prif_init, prif_stop
   implicit none
 
-  if (prif_init() /= 0) error stop "caffeinate returned a non-zero exit_code"
+  integer :: init_exit_code
+
+  call prif_init(init_exit_code)
+  if (init_exit_code /= 0) error stop "caffeinate returned a non-zero exit_code"
 
   call prif_stop
 

src/caffeine/program_startup_m.f90

@@ -1,6 +1,7 @@
 ! Copyright (c), The Regents of the University of California
 ! Terms of use are as specified in LICENSE.txt
 module program_startup_m
+  use iso_c_binding, only : c_int
   use team_type_m, only: prif_team_type
   implicit none
 
@@ -11,10 +12,10 @@ module program_startup_m
 
   interface
 
-    module function prif_init() result(exit_code)
-      implicit none 
-      integer exit_code
-    end function
+    module subroutine prif_init(exit_code)
+      implicit none
+      integer(c_int), intent(out) :: exit_code
+    end subroutine
 
   end interface
 

src/caffeine/program_startup_s.F90

@@ -1,7 +1,7 @@
 ! Copyright (c), The Regents of the University of California
 ! Terms of use are as specified in LICENSE.txt
 submodule(program_startup_m) program_startup_s
-  use iso_c_binding, only : c_int, c_loc, c_char, c_null_char
+  use iso_c_binding, only : c_loc, c_char, c_null_char
   use synchronization_m, only : prif_sync_all
   use caffeine_h_m, only : caf_caffeinate, caf_decaffeinate
   use program_termination_m, only: prif_error_stop

test/a00_caffeinate_test.f90

@@ -21,8 +21,10 @@ function check_caffeination() result(result_)
         type(result_t) :: result_
 
         integer, parameter :: successful_initiation = 0
+        integer :: init_exit_code
 
-        result_ = assert_that(prif_init() == successful_initiation)
+        call prif_init(init_exit_code)
+        result_ = assert_that(init_exit_code == successful_initiation)
     end function
 
 end module a00_caffeinate_test