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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 | * Massimiliano Giorgi <massy@gandalf.sssup.it> |
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11 | * Luca Abeni <luca@gandalf.sssup.it> |
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12 | * (see the web pages for full authors list) |
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13 | * |
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14 | * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy) |
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15 | * |
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16 | * http://www.sssup.it |
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17 | * http://retis.sssup.it |
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18 | * http://shark.sssup.it |
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19 | */ |
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20 | |||
21 | |||
22 | /** |
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23 | ------------ |
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24 | CVS : $Id: blkact.c,v 1.1.1.1 2002-03-29 14:12:51 pj Exp $ |
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25 | |||
26 | File: $File$ |
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27 | Revision: $Revision: 1.1.1.1 $ |
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28 | Last update: $Date: 2002-03-29 14:12:51 $ |
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29 | ------------ |
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30 | |||
31 | block_activations & co. |
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32 | |||
33 | **/ |
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34 | |||
35 | /* |
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36 | * Copyright (C) 2000 Paolo Gai |
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37 | * |
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38 | * This program is free software; you can redistribute it and/or modify |
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39 | * it under the terms of the GNU General Public License as published by |
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40 | * the Free Software Foundation; either version 2 of the License, or |
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41 | * (at your option) any later version. |
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42 | * |
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43 | * This program is distributed in the hope that it will be useful, |
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44 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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45 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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46 | * GNU General Public License for more details. |
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47 | * |
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48 | * You should have received a copy of the GNU General Public License |
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49 | * along with this program; if not, write to the Free Software |
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50 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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51 | * |
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52 | */ |
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53 | |||
54 | #include <stdarg.h> |
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55 | #include <ll/ll.h> |
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56 | #include <ll/stdlib.h> |
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57 | #include <ll/stdio.h> |
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58 | #include <ll/string.h> |
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59 | #include <kernel/config.h> |
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60 | #include <kernel/model.h> |
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61 | #include <kernel/const.h> |
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62 | #include <sys/types.h> |
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63 | #include <kernel/types.h> |
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64 | #include <kernel/descr.h> |
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65 | #include <errno.h> |
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66 | #include <kernel/var.h> |
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67 | #include <kernel/func.h> |
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68 | |||
69 | /*+ |
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70 | It blocks all explicit activation of a task made with task_activate and |
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71 | group_activate. These activations are registered in an internal counter, |
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72 | returned by task_unblock_activation. |
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73 | it returns 0 if all ok, or -1 otherwise. errno is set accordingly. |
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74 | +*/ |
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75 | int task_block_activation(PID p) |
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76 | { |
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77 | SYS_FLAGS f; |
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78 | |||
79 | /* some controls on the task p */ |
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80 | if (p<0 || p>=MAX_PROC) { |
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81 | errno = EUNVALID_TASK_ID; |
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82 | return -1; |
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83 | } |
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84 | if (proc_table[p].status == FREE) { |
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85 | errno = EUNVALID_TASK_ID; |
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86 | return -1; |
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87 | } |
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88 | |||
89 | f = kern_fsave(); |
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90 | if (!(proc_table[p].control & FREEZE_ACTIVATION)) { |
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91 | proc_table[p].control |= FREEZE_ACTIVATION; |
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92 | proc_table[p].frozen_activations = 0; |
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93 | } |
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94 | kern_frestore(f); |
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95 | return 0; |
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96 | } |
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97 | |||
98 | /*+ |
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99 | It unblocks all explicit activations of a task, and returns the number of |
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100 | "frozen" activations. It not call the task_activate!!!! |
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101 | it returns -1 if an error occurs. errno is set accordingly. |
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102 | +*/ |
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103 | int task_unblock_activation(PID p) |
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104 | { |
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105 | int result; |
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106 | SYS_FLAGS f; |
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107 | |||
108 | /* some controls on the task p */ |
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109 | if (p<0 || p>=MAX_PROC) { |
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110 | errno = EUNVALID_TASK_ID; |
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111 | return -1; |
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112 | } |
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113 | if (proc_table[p].status == FREE) { |
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114 | errno = EUNVALID_TASK_ID; |
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115 | return -1; |
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116 | } |
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117 | |||
118 | f = kern_fsave(); |
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119 | |||
120 | result = 0; |
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121 | |||
122 | if (proc_table[p].control & FREEZE_ACTIVATION) { |
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123 | proc_table[p].control &= ~FREEZE_ACTIVATION; |
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124 | result = proc_table[p].frozen_activations; |
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125 | proc_table[p].frozen_activations = 0; |
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126 | } |
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127 | kern_frestore(f); |
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128 | |||
129 | return result; |
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130 | } |