source: project/demonstrations/continuations/README @ 21228

== README for ''continatuations''

Code that demonstrates the use of continuations.

{{suspensions.scm}} saves the current state of an executing 
program using the {{suspension}} extension.

First compile the program and run it, passing the loop-index
at which you want to suspend the execution:

  % csc suspensions.scm
  % suspensions 5
  start.
  1
  2
  3
  4
  5
  saving state ...

The state is written to the file {{state}}, we can use
{{chicken-dump}} (part of the {{suspension}} extension) to dump the
contents of this file:

  % chicken-dump state

  File: state

  0:
  #0: procedure:
   #1:(id) string "f_188:suspension_scm"
    #2:[1] procedure:
     #3:(id) string "f_86:suspensions_scm"
      #4:[1] procedure:
       #5:(id) string "f_150:suspensions_scm"
        #6:[1] procedure:
         #7:(id) string "values_continuation"
          #8:[1] procedure:
           #9:(id) string "f_161:suspension_scm"
            #10:[1] lambda info #<lambda info (suspension#continuation-drop . results42)>
          #11:[2] procedure:
           #12:(id) string "termination_continuation"
      #13:[2] vector
       #14:[0] procedure:
        #15:(id) string "f_73:suspensions_scm"
         [1] fixnum 5
         [2] back reference -> #13
         #16:[3] lambda info #<lambda info (doloop19 i21)>
      [3] fixnum 5

Now we run the example program and tell it to resume from the saved
state:

  % suspensions state
  start.
  6
  7
  8
  9
  end.