1 | //notify.c: |
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2 | |
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3 | /* |
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4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2010 |
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5 | * |
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6 | * This file is part of libroar a part of RoarAudio, |
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7 | * a cross-platform sound system for both, home and professional use. |
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8 | * See README for details. |
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9 | * |
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10 | * This file is free software; you can redistribute it and/or modify |
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11 | * it under the terms of the GNU General Public License version 3 |
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12 | * as published by the Free Software Foundation. |
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13 | * |
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14 | * libroar is distributed in the hope that it will be useful, |
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15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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17 | * GNU General Public License for more details. |
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18 | * |
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19 | * You should have received a copy of the GNU General Public License |
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20 | * along with this software; see the file COPYING. If not, write to |
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21 | * the Free Software Foundation, 51 Franklin Street, Fifth Floor, |
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22 | * Boston, MA 02110-1301, USA. |
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23 | * |
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24 | * NOTE for everyone want's to change something and send patches: |
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25 | * read README and HACKING! There a addition information on |
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26 | * the license of this document you need to read before you send |
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27 | * any patches. |
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28 | * |
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29 | * NOTE for uses of non-GPL (LGPL,...) software using libesd, libartsc |
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30 | * or libpulse*: |
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31 | * The libs libroaresd, libroararts and libroarpulse link this lib |
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32 | * and are therefore GPL. Because of this it may be illigal to use |
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33 | * them with any software that uses libesd, libartsc or libpulse*. |
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34 | */ |
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35 | |
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36 | #include "libroar.h" |
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37 | |
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38 | struct roar_subscriber { |
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39 | uint32_t flags; |
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40 | uint32_t event; |
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41 | int emitter; |
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42 | int target; |
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43 | int target_type; |
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44 | void (*cb)(struct roar_notify_core * core, struct roar_event * event, void * userdata); |
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45 | void * userdata; |
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46 | size_t refc; |
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47 | unsigned int hash; |
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48 | // struct roar_subscriber * prev; |
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49 | struct roar_subscriber * next; |
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50 | }; |
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51 | |
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52 | struct roar_notify_core { |
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53 | size_t refc; |
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54 | size_t listc; |
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55 | struct roar_subscriber ** lists; |
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56 | }; |
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57 | |
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58 | #define _CKRCORE(ret) if ( core == NULL ) { roar_errno = ROAR_ERROR_INVAL; return (ret); } |
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59 | #define _CKICORE() _CKRCORE(-1) |
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60 | |
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61 | static unsigned int _hash_event (struct roar_notify_core * core, struct roar_event * event) { |
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62 | unsigned int hash = 0; |
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63 | unsigned int mask = core->listc - 1; |
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64 | |
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65 | hash ^= event->event >> 0; |
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66 | hash ^= event->event >> 8; |
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67 | hash ^= event->event >> 16; |
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68 | hash ^= event->event >> 24; |
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69 | |
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70 | return hash & mask; |
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71 | } |
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72 | |
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73 | struct roar_notify_core * roar_notify_core_new(ssize_t lists) { |
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74 | struct roar_notify_core * core = NULL; |
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75 | |
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76 | switch (lists) { |
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77 | case 1: |
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78 | case 2: |
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79 | case 4: |
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80 | case 8: |
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81 | case 16: |
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82 | case 32: |
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83 | case 64: |
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84 | case 128: |
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85 | case 256: |
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86 | // they all are ok. |
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87 | break; |
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88 | case -1: |
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89 | // handle defult: |
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90 | lists = 16; |
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91 | break; |
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92 | default: |
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93 | roar_errno = ROAR_ERROR_INVAL; |
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94 | return NULL; |
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95 | break; |
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96 | } |
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97 | |
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98 | if ( (core = roar_mm_malloc(sizeof(struct roar_notify_core))) == NULL ) { |
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99 | return NULL; |
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100 | } |
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101 | |
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102 | memset(core, 0, sizeof(struct roar_notify_core)); |
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103 | |
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104 | core->refc = 1; |
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105 | core->listc = lists; |
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106 | core->lists = roar_mm_malloc(lists*sizeof(struct roar_subscriber *)); |
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107 | |
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108 | if ( core->lists == NULL ) { |
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109 | roar_mm_free(core); |
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110 | return NULL; |
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111 | } |
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112 | |
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113 | return core; |
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114 | } |
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115 | |
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116 | int roar_notify_core_ref(struct roar_notify_core * core) { |
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117 | _CKICORE(); |
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118 | |
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119 | core->refc++; |
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120 | |
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121 | return 0; |
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122 | } |
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123 | |
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124 | int roar_notify_core_unref(struct roar_notify_core * core) { |
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125 | struct roar_subscriber * cur, * next; |
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126 | size_t i; |
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127 | |
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128 | _CKICORE(); |
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129 | |
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130 | if ( core->refc == 0 ) { |
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131 | ROAR_ERR("roar_notify_core_unref(core=%p): refc is zero, must be greater zero. resolving by setting to one.", core); |
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132 | core->refc = 1; |
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133 | } |
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134 | |
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135 | core->refc--; |
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136 | |
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137 | if ( core->refc > 0 ) { |
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138 | return 0; |
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139 | } |
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140 | |
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141 | for (i = 0; i < core->listc; i++) { |
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142 | cur = core->lists[i]; |
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143 | while (cur != NULL) { |
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144 | next = cur->next; |
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145 | |
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146 | roar_mm_free(cur); |
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147 | |
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148 | cur = next; |
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149 | } |
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150 | } |
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151 | |
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152 | roar_mm_free(core->lists); |
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153 | roar_mm_free(core); |
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154 | return 0; |
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155 | } |
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156 | |
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157 | struct roar_subscriber * roar_notify_core_subscribe(struct roar_notify_core * core, struct roar_event * event, void (*cb)(struct roar_notify_core * core, struct roar_event * event, void * userdata), void * userdata) { |
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158 | struct roar_subscriber * subs = NULL; |
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159 | struct roar_subscriber * cur, * old; |
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160 | |
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161 | _CKRCORE(NULL); |
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162 | |
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163 | if ( event == NULL || cb == NULL ) { |
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164 | roar_errno = ROAR_ERROR_INVAL; |
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165 | return NULL; |
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166 | } |
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167 | |
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168 | if ( (subs = roar_mm_malloc(sizeof(struct roar_subscriber))) == NULL ) { |
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169 | return NULL; |
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170 | } |
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171 | |
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172 | memset(subs, 0, sizeof(struct roar_subscriber)); |
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173 | |
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174 | subs->flags = 0; |
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175 | subs->event = event->event; |
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176 | subs->emitter = event->emitter; |
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177 | subs->target = event->target; |
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178 | subs->target_type = event->target_type; |
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179 | subs->cb = cb; |
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180 | subs->userdata = userdata; |
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181 | subs->refc = 1; |
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182 | subs->hash = _hash_event(core, event); |
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183 | subs->next = NULL; |
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184 | |
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185 | if ( (cur = core->lists[subs->hash]) == NULL ) { |
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186 | core->lists[subs->hash] = subs; |
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187 | } else { |
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188 | old = cur; |
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189 | while (cur != NULL) { |
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190 | old = cur; |
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191 | cur = cur->next; |
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192 | } |
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193 | |
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194 | old->next = subs; |
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195 | } |
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196 | |
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197 | return subs; |
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198 | } |
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199 | |
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200 | int roar_notify_core_unsubscribe(struct roar_notify_core * core, struct roar_subscriber * subscriber) { |
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201 | struct roar_subscriber * cur, * old; |
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202 | |
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203 | _CKICORE(); |
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204 | |
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205 | if ( subscriber ) { |
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206 | roar_errno = ROAR_ERROR_INVAL; |
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207 | return -1; |
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208 | } |
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209 | |
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210 | if ( (cur = core->lists[subscriber->hash]) == subscriber ) { |
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211 | core->lists[subscriber->hash] = core->lists[subscriber->hash]->next; |
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212 | } else { |
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213 | old = NULL; |
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214 | while (cur != NULL && cur != subscriber ) { |
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215 | old = cur; |
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216 | cur = cur->next; |
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217 | } |
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218 | |
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219 | if ( cur != subscriber ) |
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220 | return -1; |
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221 | |
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222 | old->next = cur->next; |
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223 | roar_mm_free(cur); |
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224 | } |
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225 | |
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226 | return 0; |
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227 | } |
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228 | |
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229 | int roar_notify_core_emit(struct roar_notify_core * core, struct roar_event * event) { |
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230 | struct roar_subscriber * cur; |
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231 | |
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232 | _CKICORE(); |
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233 | |
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234 | if ( event ) { |
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235 | roar_errno = ROAR_ERROR_INVAL; |
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236 | return -1; |
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237 | } |
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238 | |
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239 | cur = core->lists[_hash_event(core, event)]; |
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240 | |
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241 | while (cur != NULL) { |
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242 | if ( cur->cb == NULL ) { |
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243 | ROAR_ERR("roar_notify_core_emit(core=%p, event=%p): cur=%p, cb is set NULL, bad.", core, event, cur); |
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244 | } else { |
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245 | cur->cb(core, event, cur->userdata); |
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246 | } |
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247 | cur = cur->next; |
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248 | } |
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249 | |
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250 | return 0; |
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251 | } |
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252 | |
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253 | //ll |
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