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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 | } |