| 1 | /* |
| 2 | * ========== Copyright Header Begin ========================================== |
| 3 | * |
| 4 | * OpenSPARC T2 Processor File: callback.c |
| 5 | * Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved. |
| 6 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES. |
| 7 | * |
| 8 | * The above named program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public |
| 10 | * License version 2 as published by the Free Software Foundation. |
| 11 | * |
| 12 | * The above named program is distributed in the hope that it will be |
| 13 | * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public |
| 18 | * License along with this work; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. |
| 20 | * |
| 21 | * ========== Copyright Header End ============================================ |
| 22 | */ |
| 23 | /* |
| 24 | * Copyright 2006 Sun Microsystems, Inc. All rights reserved. |
| 25 | * Use is subject to license terms. |
| 26 | */ |
| 27 | #pragma ident "@(#)callback.c 1.2 06/09/27 SMI" |
| 28 | |
| 29 | #include <stdlib.h> |
| 30 | #include <pthread.h> |
| 31 | |
| 32 | #include "list.h" |
| 33 | #include "allocate.h" |
| 34 | #include "basics.h" |
| 35 | #include "callback.h" |
| 36 | |
| 37 | typedef struct { |
| 38 | callback_type_t type; |
| 39 | cb_func_t *cb_func; |
| 40 | void *cb_arg; |
| 41 | } cb_entry_t; |
| 42 | |
| 43 | typedef LIST_DEF(cb_list_t, cb_entry_t); |
| 44 | static cb_list_t cb_list; |
| 45 | static pthread_mutex_t cb_lock; |
| 46 | |
| 47 | void |
| 48 | callback_fire(callback_type_t type) |
| 49 | { |
| 50 | int i; |
| 51 | |
| 52 | /* can't grab cb_lock as funcs call callback_delete()... */ |
| 53 | for (i = 0; i < cb_list.count; i++) { |
| 54 | cb_entry_t *p; |
| 55 | |
| 56 | p = LIST_ENTRY(cb_list, i); |
| 57 | if (p->type == type) |
| 58 | (*p->cb_func)(p->cb_arg); |
| 59 | } |
| 60 | } |
| 61 | |
| 62 | void |
| 63 | callback_register(callback_type_t type, cb_func_t func, void *arg) |
| 64 | { |
| 65 | cb_entry_t *p; |
| 66 | int i; |
| 67 | |
| 68 | pthread_mutex_lock(&cb_lock); |
| 69 | |
| 70 | /* Check "free list". */ |
| 71 | for (i = 0, p = NULL; i < cb_list.count; i++) { |
| 72 | cb_entry_t *p1; |
| 73 | p1 = LIST_ENTRY(cb_list, i); |
| 74 | if (p1->type == CB_None) { |
| 75 | p = p1; |
| 76 | break; |
| 77 | } |
| 78 | } |
| 79 | |
| 80 | /* Allocate a new one? */ |
| 81 | if (p == NULL) |
| 82 | p = LIST_ADD(cb_list, cb_entry_t); |
| 83 | |
| 84 | p->type = type; |
| 85 | p->cb_func = func; |
| 86 | p->cb_arg = arg; |
| 87 | pthread_mutex_unlock(&cb_lock); |
| 88 | } |
| 89 | |
| 90 | void |
| 91 | callback_delete(cb_func_t func) |
| 92 | { |
| 93 | int i; |
| 94 | |
| 95 | pthread_mutex_lock(&cb_lock); |
| 96 | for (i = 0; i < cb_list.count; i++) { |
| 97 | cb_entry_t *p; |
| 98 | |
| 99 | p = LIST_ENTRY(cb_list, i); |
| 100 | if (p->cb_func == func) |
| 101 | p->type = CB_None; /* Onto "free list". */ |
| 102 | } |
| 103 | pthread_mutex_unlock(&cb_lock); |
| 104 | } |
| 105 | |
| 106 | void |
| 107 | callback_init() |
| 108 | { |
| 109 | pthread_mutex_init(&cb_lock, NULL); |
| 110 | } |