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| 1 : | pazsan | 1.1 | \ Multitasker 19aug94py |
| 2 : | |||
| 3 : | anton | 1.4 | \ Copyright (C) 1995-1997 Free Software Foundation, Inc. |
| 4 : | |||
| 5 : | \ This file is part of Gforth. | ||
| 6 : | |||
| 7 : | \ Gforth is free software; you can redistribute it and/or | ||
| 8 : | \ modify it under the terms of the GNU General Public License | ||
| 9 : | \ as published by the Free Software Foundation; either version 2 | ||
| 10 : | \ of the License, or (at your option) any later version. | ||
| 11 : | |||
| 12 : | \ This program is distributed in the hope that it will be useful, | ||
| 13 : | \ but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 14 : | \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| 15 : | \ GNU General Public License for more details. | ||
| 16 : | |||
| 17 : | \ You should have received a copy of the GNU General Public License | ||
| 18 : | \ along with this program; if not, write to the Free Software | ||
| 19 : | \ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | ||
| 20 : | |||
| 21 : | pazsan | 1.1 | Create sleepers sleepers A, sleepers A, 0 , |
| 22 : | |||
| 23 : | \ LINK-TASK links task1 into the task chain of task2 | ||
| 24 : | : link-task ( task1 task2 -- ) | ||
| 25 : | over 2@ 2dup cell+ ! swap ! \ unlink task1 | ||
| 26 : | 2dup @ cell+ ! 2dup dup @ rot 2! ! ; | ||
| 27 : | |||
| 28 : | : sleep ( task -- ) sleepers link-task ; | ||
| 29 : | : wake ( task -- ) next-task link-task ; | ||
| 30 : | |||
| 31 : | \ PAUSE is the task-switcher | ||
| 32 : | : pause ( -- ) | ||
| 33 : | rp@ fp@ lp@ sp@ save-task ! | ||
| 34 : | next-task @ up! save-task @ sp! | ||
| 35 : | lp! fp! rp! ; | ||
| 36 : | |||
| 37 : | \ STOP sleeps a task and switches to the next | ||
| 38 : | : stop ( -- ) | ||
| 39 : | rp@ fp@ lp@ sp@ save-task ! | ||
| 40 : | next-task @ up! save-task @ sp! | ||
| 41 : | lp! fp! rp! prev-task @ sleep ; | ||
| 42 : | |||
| 43 : | \ USER' computes the task offset | ||
| 44 : | jwilke | 1.6 | :noname ' >body @ ; |
| 45 : | :noname ' >body @ postpone literal ; | ||
| 46 : | interpret/compile: user' ( 'user' -- n ) | ||
| 47 : | pazsan | 1.1 | |
| 48 : | \ NEWTASK creates a new, sleeping task | ||
| 49 : | : NewTask ( n -- Task ) dup 2* 2* udp @ + dup | ||
| 50 : | allocate throw + >r | ||
| 51 : | r@ over - udp @ - next-task over udp @ move | ||
| 52 : | jwilke | 1.5 | r> over user' rp0 + ! dup >r |
| 53 : | dup r@ user' lp0 + ! over - | ||
| 54 : | dup r@ user' fp0 + ! over - | ||
| 55 : | dup r@ user' sp0 + ! over - | ||
| 56 : | pazsan | 1.1 | dup r@ user' normal-dp + dup >r ! |
| 57 : | r> r@ user' dpp + ! + $10 + | ||
| 58 : | r@ user' >tib + ! | ||
| 59 : | r> dup 2dup 2! dup sleep ; | ||
| 60 : | |||
| 61 : | : kill-task | ||
| 62 : | next-task @ up! save-task @ sp! | ||
| 63 : | lp! fp! rp! prev-task @ dup dup link-task user' normal-dp + @ free throw ; | ||
| 64 : | |||
| 65 : | : (pass) ( x1 .. xn n task -- ) rdrop | ||
| 66 : | [ ' kill-task >body ] ALiteral r> | ||
| 67 : | jwilke | 1.5 | rot >r r@ user' rp0 + @ 2 cells - dup >r 2! |
| 68 : | pazsan | 1.1 | r> swap 1+ |
| 69 : | jwilke | 1.5 | r@ user' fp0 + @ swap 1+ |
| 70 : | r@ user' lp0 + @ swap 1+ | ||
| 71 : | cells r@ user' sp0 + @ tuck swap - dup r@ user' save-task + ! | ||
| 72 : | pazsan | 1.1 | ?DO I ! cell +LOOP r> wake ; |
| 73 : | |||
| 74 : | : activate ( task -- ) 0 swap (pass) ; | ||
| 75 : | : pass ( x1 .. xn n task -- ) (pass) ; | ||
| 76 : | |||
| 77 : | pazsan | 1.2 | : single-tasking? ( -- flag ) |
| 78 : | next-task dup @ = ; | ||
| 79 : | |||
| 80 : | : task-key BEGIN pause key? single-tasking? or UNTIL (key) ; | ||
| 81 : | pazsan | 1.1 | : task-emit (emit) pause ; |
| 82 : | : task-type (type) pause ; | ||
| 83 : | |||
| 84 : | ' task-key IS key | ||
| 85 : | ' task-emit IS emit | ||
| 86 : | ' task-type IS type |
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