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| 2 | pj | 1 | /* |
| 2 | * Project: S.Ha.R.K. |
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| 3 | * |
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| 4 | * Coordinators: |
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| 5 | * Giorgio Buttazzo <giorgio@sssup.it> |
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| 6 | * Paolo Gai <pj@gandalf.sssup.it> |
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| 7 | * |
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| 8 | * Authors : |
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| 9 | * Paolo Gai <pj@gandalf.sssup.it> |
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| 10 | * (see the web pages for full authors list) |
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| 11 | * |
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| 12 | * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy) |
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| 13 | * |
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| 14 | * http://www.sssup.it |
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| 15 | * http://retis.sssup.it |
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| 16 | * http://shark.sssup.it |
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| 17 | */ |
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| 18 | |||
| 19 | /** |
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| 20 | ------------ |
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| 21 | CVS : $Id: tpreempt.c,v 1.1.1.1 2002-03-29 14:12:52 pj Exp $ |
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| 22 | |||
| 23 | File: $File$ |
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| 24 | Revision: $Revision: 1.1.1.1 $ |
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| 25 | Last update: $Date: 2002-03-29 14:12:52 $ |
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| 26 | ------------ |
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| 27 | |||
| 28 | task_preempt and task_nopreempt |
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| 29 | |||
| 30 | **/ |
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| 31 | |||
| 32 | /* |
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| 33 | * Copyright (C) 2000 Paolo Gai |
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| 34 | * |
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| 35 | * This program is free software; you can redistribute it and/or modify |
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| 36 | * it under the terms of the GNU General Public License as published by |
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| 37 | * the Free Software Foundation; either version 2 of the License, or |
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| 38 | * (at your option) any later version. |
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| 39 | * |
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| 40 | * This program is distributed in the hope that it will be useful, |
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| 41 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 42 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 43 | * GNU General Public License for more details. |
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| 44 | * |
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| 45 | * You should have received a copy of the GNU General Public License |
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| 46 | * along with this program; if not, write to the Free Software |
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| 47 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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| 48 | * |
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| 49 | */ |
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| 50 | |||
| 51 | #include <stdarg.h> |
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| 52 | #include <ll/ll.h> |
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| 53 | #include <ll/stdlib.h> |
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| 54 | #include <ll/stdio.h> |
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| 55 | #include <ll/string.h> |
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| 56 | #include <kernel/config.h> |
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| 57 | #include <kernel/model.h> |
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| 58 | #include <kernel/const.h> |
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| 59 | #include <sys/types.h> |
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| 60 | #include <kernel/types.h> |
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| 61 | #include <kernel/descr.h> |
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| 62 | #include <errno.h> |
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| 63 | #include <kernel/var.h> |
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| 64 | #include <kernel/func.h> |
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| 65 | |||
| 66 | |||
| 67 | /*+ This primitive set the non-preemption flag in the task |
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| 68 | descriptor control field +*/ |
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| 69 | void task_nopreempt(void) |
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| 70 | { |
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| 71 | if ((~proc_table[exec_shadow].control) & NO_PREEMPT) { |
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| 72 | kern_cli(); |
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| 73 | proc_table[exec_shadow].control |= NO_PREEMPT; |
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| 74 | if (cap_timer != NIL) { |
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| 75 | event_delete(cap_timer); |
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| 76 | cap_timer = NIL; |
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| 77 | } |
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| 78 | kern_sti(); |
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| 79 | } |
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| 80 | } |
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| 81 | |||
| 82 | /*+ This primitive reset the non-preemption flag in the task |
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| 83 | descriptor control field and check if there is a preemption |
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| 84 | to make... |
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| 85 | +*/ |
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| 86 | void task_preempt(void) |
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| 87 | { |
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| 88 | if (proc_table[exec_shadow].control & NO_PREEMPT) |
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| 89 | { |
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| 90 | proc_table[exec_shadow].context = kern_context_save(); |
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| 91 | |||
| 92 | proc_table[exec_shadow].control &= ~NO_PREEMPT; |
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| 93 | scheduler(); |
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| 94 | kern_context_load(proc_table[exec_shadow].context); |
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| 95 | } |
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| 96 | } |