[gforth] / gforth / tasker.fs  

gforth: gforth/tasker.fs

Diff for /gforth/tasker.fs between version 1.5 and 1.14

version 1.5, Sun Jul 6 14:42:14 1997 UTC version 1.14, Mon Dec 31 19:02:24 2007 UTC
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 \ Multitasker                                          19aug94py  \ Multitasker                                          19aug94py
   
 \ Copyright (C) 1995-1997 Free Software Foundation, Inc.  \ Copyright (C) 1995,1996,1997,2001,2003,2007 Free Software Foundation, Inc.
   
 \ This file is part of Gforth.  \ This file is part of Gforth.
   
 \ Gforth is free software; you can redistribute it and/or  \ Gforth is free software; you can redistribute it and/or
 \ modify it under the terms of the GNU General Public License  \ modify it under the terms of the GNU General Public License
 \ as published by the Free Software Foundation; either version 2  \ as published by the Free Software Foundation, either version 3
 \ of the License, or (at your option) any later version.  \ of the License, or (at your option) any later version.
   
 \ This program is distributed in the hope that it will be useful,  \ This program is distributed in the hope that it will be useful,
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 \ GNU General Public License for more details.  \ GNU General Public License for more details.
   
 \ You should have received a copy of the GNU General Public License  \ You should have received a copy of the GNU General Public License
 \ along with this program; if not, write to the Free Software  \ along with this program. If not, see http://www.gnu.org/licenses/.
 \ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  
   
 Create sleepers  sleepers A, sleepers A, 0 ,  Create sleepers  sleepers A, sleepers A, 0 ,
   
 \ LINK-TASK links task1 into the task chain of task2  
 : link-task ( task1 task2 -- )  : link-task ( task1 task2 -- )
       \G LINK-TASK links task1 into the task chain of task2
   over 2@  2dup cell+ ! swap !  \ unlink task1    over 2@  2dup cell+ ! swap !  \ unlink task1
   2dup @ cell+ !  2dup dup @ rot 2!  ! ;    2dup @ cell+ !  2dup dup @ rot 2!  ! ;
   
 : sleep ( task -- )  sleepers  link-task ;  : sleep ( task -- )
 : wake  ( task -- )  next-task link-task ;      \G deactivates task
       sleepers  link-task ;
   : wake  ( task -- )
       \G activates task
       next-task link-task ;
   
 \ PAUSE is the task-switcher  
 : pause ( -- )  : pause ( -- )
       \G PAUSE is the task-switcher
   rp@ fp@ lp@ sp@ save-task !    rp@ fp@ lp@ sp@ save-task !
   next-task @ up! save-task @ sp!    next-task @ up! save-task @ sp!
   lp! fp! rp! ;    lp! fp! rp! ;
   
 \ STOP sleeps a task and switches to the next  
 : stop ( -- )  : stop ( -- )
       \G STOP sleeps a task and switches to the next
   rp@ fp@ lp@ sp@ save-task !    rp@ fp@ lp@ sp@ save-task !
   next-task @ up! save-task @ sp!    next-task @ up! save-task @ sp!
   lp! fp! rp! prev-task @ sleep ;    lp! fp! rp! prev-task @ sleep ;
   
 \ USER' computes the task offset  :noname    ' >body @ ;
 : user' ( 'user' -- n )  :noname    ' >body @ postpone literal ;
     ' >body @ postpone literal ; immediate  interpret/compile: user' ( 'user' -- n )
 interpretation:  \G USER' computes the task offset of a user variable
     ' >body @ ;  
   
 \ NEWTASK creates a new, sleeping task  : NewTask ( stacksize -- Task )  dup 2* 2* udp @ + dup
 : NewTask ( n -- Task )  dup 2* 2* udp @ + dup      \G NEWTASK creates a new, sleeping task
   allocate throw  + >r    allocate throw  + >r
   r@ over - udp @ - next-task over udp @ move    r@ over - udp @ - next-task over udp @ move
   r> over user' rp0 + ! dup >r    r> over user' rp0 + ! dup >r
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   dup r@ user' fp0   + ! over -    dup r@ user' fp0   + ! over -
   dup r@ user' sp0   + ! over -    dup r@ user' sp0   + ! over -
   dup r@ user' normal-dp + dup >r !    dup r@ user' normal-dp + dup >r !
    r> r@ user' dpp  + ! + $10 +      r> r@ user' dpp  + ! 2drop
       r@ user' >tib + !      0 r@ user' current-input + !
   r> dup 2dup 2! dup sleep ;    r> dup 2dup 2! dup sleep ;
   
 : kill-task  Create killer killer A, killer A,
   : kill ( task -- )
       \G kills a task - deactivate and free task area
       dup killer link-task  killer dup dup 2!
       user' normal-dp + @ free throw ;
   
   : kill-task ( -- )
       \G kills the current task, also on bottom of return stack of a new task
   next-task @ up! save-task @ sp!    next-task @ up! save-task @ sp!
   lp! fp! rp! prev-task @ dup dup link-task user' normal-dp + @ free throw ;      lp! fp! rp! prev-task @ kill ;
   
 : (pass) ( x1 .. xn n task -- )  rdrop  : (pass) ( x1 .. xn n task -- )  rdrop
   [ ' kill-task >body ] ALiteral r>    [ ' kill-task >body ] ALiteral r>
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   cells r@ user' sp0 + @ tuck swap - dup r@ user' save-task + !    cells r@ user' sp0 + @ tuck swap - dup r@ user' save-task + !
   ?DO  I !  cell  +LOOP  r> wake ;    ?DO  I !  cell  +LOOP  r> wake ;
   
 : activate ( task -- )  0 swap (pass) ;  : activate ( task -- )
 : pass ( x1 .. xn n task -- )  (pass) ;      \G activates the task.
       \G Continues execution with the caller of ACTIVATE.
       0 swap (pass) ;
   : pass ( x1 .. xn n task -- )
       \G passes n parameters to the task and activates that task.
       \G Continues execution with the caller of PASS.
       (pass) ;
   
 : single-tasking? ( -- flag )  : single-tasking? ( -- flag )
       \G checks if only one task is running
     next-task dup @ = ;      next-task dup @ = ;
   
 : task-key   BEGIN  pause key? single-tasking? or  UNTIL  (key) ;  : task-key   BEGIN  pause key? single-tasking? or  UNTIL  (key) ;

Generate output suitable for use with a patch program
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