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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 | } |