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| 1 : | pazsan | 1.1 | \ Multitasker 19aug94py |
| 2 : | |||
| 3 : | anton | 1.12 | \ Copyright (C) 1995,1996,1997,2001,2003 Free Software Foundation, Inc. |
| 4 : | anton | 1.4 | |
| 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 : | anton | 1.8 | \ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. |
| 20 : | anton | 1.4 | |
| 21 : | pazsan | 1.1 | Create sleepers sleepers A, sleepers A, 0 , |
| 22 : | |||
| 23 : | : link-task ( task1 task2 -- ) | ||
| 24 : | pazsan | 1.10 | \G LINK-TASK links task1 into the task chain of task2 |
| 25 : | over 2@ 2dup cell+ ! swap ! \ unlink task1 | ||
| 26 : | 2dup @ cell+ ! 2dup dup @ rot 2! ! ; | ||
| 27 : | |||
| 28 : | : sleep ( task -- ) | ||
| 29 : | \G deactivates task | ||
| 30 : | sleepers link-task ; | ||
| 31 : | : wake ( task -- ) | ||
| 32 : | \G activates task | ||
| 33 : | next-task link-task ; | ||
| 34 : | pazsan | 1.1 | |
| 35 : | : pause ( -- ) | ||
| 36 : | pazsan | 1.10 | \G PAUSE is the task-switcher |
| 37 : | rp@ fp@ lp@ sp@ save-task ! | ||
| 38 : | next-task @ up! save-task @ sp! | ||
| 39 : | lp! fp! rp! ; | ||
| 40 : | pazsan | 1.1 | |
| 41 : | : stop ( -- ) | ||
| 42 : | pazsan | 1.10 | \G STOP sleeps a task and switches to the next |
| 43 : | rp@ fp@ lp@ sp@ save-task ! | ||
| 44 : | next-task @ up! save-task @ sp! | ||
| 45 : | lp! fp! rp! prev-task @ sleep ; | ||
| 46 : | pazsan | 1.1 | |
| 47 : | jwilke | 1.6 | :noname ' >body @ ; |
| 48 : | :noname ' >body @ postpone literal ; | ||
| 49 : | interpret/compile: user' ( 'user' -- n ) | ||
| 50 : | pazsan | 1.10 | \G USER' computes the task offset of a user variable |
| 51 : | pazsan | 1.1 | |
| 52 : | pazsan | 1.10 | : NewTask ( stacksize -- Task ) dup 2* 2* udp @ + dup |
| 53 : | \G NEWTASK creates a new, sleeping task | ||
| 54 : | allocate throw + >r | ||
| 55 : | r@ over - udp @ - next-task over udp @ move | ||
| 56 : | r> over user' rp0 + ! dup >r | ||
| 57 : | dup r@ user' lp0 + ! over - | ||
| 58 : | dup r@ user' fp0 + ! over - | ||
| 59 : | dup r@ user' sp0 + ! over - | ||
| 60 : | dup r@ user' normal-dp + dup >r ! | ||
| 61 : | r> r@ user' dpp + ! 2drop | ||
| 62 : | pazsan | 1.9 | 0 r@ user' current-input + ! |
| 63 : | pazsan | 1.10 | r> dup 2dup 2! dup sleep ; |
| 64 : | pazsan | 1.1 | |
| 65 : | pazsan | 1.10 | Create killer killer A, killer A, |
| 66 : | : kill ( task -- ) | ||
| 67 : | \G kills a task - deactivate and free task area | ||
| 68 : | dup killer link-task killer dup dup 2! | ||
| 69 : | user' normal-dp + @ free throw ; | ||
| 70 : | |||
| 71 : | : kill-task ( -- ) | ||
| 72 : | \G kills the current task, also on bottom of return stack of a new task | ||
| 73 : | next-task @ up! save-task @ sp! | ||
| 74 : | lp! fp! rp! prev-task @ kill ; | ||
| 75 : | pazsan | 1.1 | |
| 76 : | : (pass) ( x1 .. xn n task -- ) rdrop | ||
| 77 : | [ ' kill-task >body ] ALiteral r> | ||
| 78 : | jwilke | 1.5 | rot >r r@ user' rp0 + @ 2 cells - dup >r 2! |
| 79 : | pazsan | 1.1 | r> swap 1+ |
| 80 : | jwilke | 1.5 | r@ user' fp0 + @ swap 1+ |
| 81 : | r@ user' lp0 + @ swap 1+ | ||
| 82 : | cells r@ user' sp0 + @ tuck swap - dup r@ user' save-task + ! | ||
| 83 : | pazsan | 1.1 | ?DO I ! cell +LOOP r> wake ; |
| 84 : | |||
| 85 : | pazsan | 1.10 | : activate ( task -- ) |
| 86 : | \G activates the task. | ||
| 87 : | \G Continues execution with the caller of ACTIVATE. | ||
| 88 : | 0 swap (pass) ; | ||
| 89 : | : pass ( x1 .. xn n task -- ) | ||
| 90 : | \G passes n parameters to the task and activates that task. | ||
| 91 : | \G Continues execution with the caller of PASS. | ||
| 92 : | (pass) ; | ||
| 93 : | pazsan | 1.1 | |
| 94 : | pazsan | 1.2 | : single-tasking? ( -- flag ) |
| 95 : | pazsan | 1.10 | \G checks if only one task is running |
| 96 : | pazsan | 1.2 | next-task dup @ = ; |
| 97 : | |||
| 98 : | : task-key BEGIN pause key? single-tasking? or UNTIL (key) ; | ||
| 99 : | pazsan | 1.1 | : task-emit (emit) pause ; |
| 100 : | : task-type (type) pause ; | ||
| 101 : | |||
| 102 : | ' task-key IS key | ||
| 103 : | ' task-emit IS emit | ||
| 104 : | ' task-type IS type |
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