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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: cancel.c,v 1.1.1.1 2002-03-29 14:12:51 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 14:12:51 $ |
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| 26 | ------------ |
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| 27 | |||
| 28 | This file contains: |
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| 29 | |||
| 30 | - the cancellation point function |
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| 31 | - the setcancelstate and setcanceltype functions |
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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 | /*+ |
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| 69 | This primitive creates a cancellation point in the calling task |
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| 70 | +*/ |
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| 71 | void task_testcancel(void) |
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| 72 | { |
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| 73 | SYS_FLAGS f; // testcancel may be called from primitives, i.e. task_join |
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| 74 | |||
| 75 | f = kern_fsave(); |
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| 76 | |||
| 77 | if (proc_table[exec_shadow].control & KILL_ENABLED && |
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| 78 | proc_table[exec_shadow].control & KILL_REQUEST ) { |
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| 79 | task_makefree(TASK_CANCELED); |
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| 80 | ll_context_to(proc_table[exec_shadow].context); |
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| 81 | } |
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| 82 | kern_frestore(f); |
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| 83 | } |
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| 84 | |||
| 85 | /*+ This primitive set the cancellation state of the task +*/ |
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| 86 | int task_setcancelstate(int state, int *oldstate) |
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| 87 | { |
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| 88 | kern_cli(); |
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| 89 | if (state != TASK_CANCEL_ENABLE && |
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| 90 | state != TASK_CANCEL_DISABLE) |
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| 91 | return -1; |
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| 92 | |||
| 93 | *oldstate = (proc_table[exec_shadow].control & KILL_ENABLED) != 0; |
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| 94 | proc_table[exec_shadow].control &= ~KILL_ENABLED; |
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| 95 | proc_table[exec_shadow].control |= state; |
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| 96 | |||
| 97 | kern_sti(); |
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| 98 | return 0; |
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| 99 | } |
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| 100 | |||
| 101 | /*+ This primitive set the cancellation type of the task +*/ |
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| 102 | int task_setcanceltype(int type, int *oldtype) |
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| 103 | { |
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| 104 | kern_cli(); |
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| 105 | if (type != TASK_CANCEL_DEFERRED && |
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| 106 | type != TASK_CANCEL_ASYNCHRONOUS) |
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| 107 | return -1; |
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| 108 | |||
| 109 | *oldtype = (proc_table[exec_shadow].control & KILL_DEFERRED) != 0; |
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| 110 | proc_table[exec_shadow].control &= ~KILL_DEFERRED; |
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| 111 | proc_table[exec_shadow].control |= type; |
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| 112 | |||
| 113 | kern_sti(); |
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| 114 | return 0; |
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| 115 | } |