1 | //mainloop.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 | * The code (may) include prototypes and comments (and maybe |
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6 | * other code fragements) from libpulse*. They are mostly copyrighted by: |
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7 | * Lennart Poettering <poettering@users.sourceforge.net> and |
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8 | * Pierre Ossman <drzeus@drzeus.cx> |
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9 | * |
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10 | * This file is part of libroarpulse a part of RoarAudio, |
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11 | * a cross-platform sound system for both, home and professional use. |
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12 | * See README for details. |
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13 | * |
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14 | * This file is free software; you can redistribute it and/or modify |
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15 | * it under the terms of the GNU General Public License version 3 |
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16 | * as published by the Free Software Foundation. |
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17 | * |
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18 | * RoarAudio is distributed in the hope that it will be useful, |
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19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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21 | * GNU General Public License for more details. |
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22 | * |
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23 | * You should have received a copy of the GNU General Public License |
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24 | * along with this software; see the file COPYING. If not, write to |
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25 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
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26 | * |
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27 | * NOTE for everyone want's to change something and send patches: |
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28 | * read README and HACKING! There a addition information on |
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29 | * the license of this document you need to read before you send |
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30 | * any patches. |
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31 | * |
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32 | * NOTE for uses of non-GPL (LGPL,...) software using libesd, libartsc |
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33 | * or libpulse*: |
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34 | * The libs libroaresd, libroararts and libroarpulse link this libroar |
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35 | * and are therefore GPL. Because of this it may be illigal to use |
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36 | * them with any software that uses libesd, libartsc or libpulse*. |
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37 | */ |
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38 | |
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39 | #include <libroarpulse/libroarpulse.h> |
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40 | |
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41 | struct pa_mainloop { |
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42 | pa_mainloop_api api; |
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43 | pa_poll_func poll_func; |
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44 | void * poll_userdata; |
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45 | int quit; |
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46 | int quitval; |
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47 | }; |
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48 | |
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49 | struct pa_io_event { |
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50 | pa_mainloop_api *api; |
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51 | int fd; |
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52 | pa_io_event_flags_t events; |
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53 | pa_io_event_cb_t cb; |
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54 | void *userdata; |
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55 | }; |
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56 | |
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57 | /** Allocate a new main loop object */ |
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58 | pa_mainloop *pa_mainloop_new(void) { |
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59 | pa_mainloop * m = roar_mm_malloc(sizeof(pa_mainloop)); |
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60 | |
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61 | if ( m == NULL ) |
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62 | return NULL; |
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63 | |
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64 | memset(m, 0, sizeof(pa_mainloop)); |
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65 | |
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66 | m->api.userdata = m; |
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67 | |
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68 | return m; |
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69 | } |
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70 | |
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71 | /** Free a main loop object */ |
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72 | void pa_mainloop_free(pa_mainloop* m) { |
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73 | if ( m == NULL ) |
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74 | return; |
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75 | |
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76 | roar_mm_free(m); |
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77 | } |
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78 | |
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79 | /** Prepare for a single iteration of the main loop. Returns a negative value |
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80 | on error or exit request. timeout specifies a maximum timeout for the subsequent |
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81 | poll, or -1 for blocking behaviour. .*/ |
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82 | int pa_mainloop_prepare(pa_mainloop *m, int timeout) { |
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83 | if ( m == NULL ) |
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84 | return -1; |
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85 | |
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86 | m->quit = 1; |
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87 | |
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88 | if ( m->quit ) |
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89 | return -2; |
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90 | |
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91 | return -1; |
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92 | } |
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93 | |
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94 | /** Execute the previously prepared poll. Returns a negative value on error.*/ |
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95 | int pa_mainloop_poll(pa_mainloop *m) { |
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96 | if ( m == NULL ) |
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97 | return -1; |
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98 | |
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99 | if ( m->quit ) |
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100 | return -2; |
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101 | |
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102 | return -1; |
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103 | } |
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104 | |
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105 | /** Dispatch timeout, io and deferred events from the previously executed poll. Returns |
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106 | a negative value on error. On success returns the number of source dispatched. */ |
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107 | int pa_mainloop_dispatch(pa_mainloop *m) { |
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108 | if ( m == NULL ) |
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109 | return -1; |
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110 | |
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111 | if ( m->quit ) |
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112 | return -2; |
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113 | |
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114 | return -1; |
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115 | } |
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116 | |
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117 | /** Return the return value as specified with the main loop's quit() routine. */ |
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118 | int pa_mainloop_get_retval(pa_mainloop *m) { |
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119 | if ( m == NULL ) |
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120 | return -1; |
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121 | |
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122 | return m->quitval; |
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123 | } |
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124 | |
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125 | /** Run a single iteration of the main loop. This is a convenience function |
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126 | for pa_mainloop_prepare(), pa_mainloop_poll() and pa_mainloop_dispatch(). |
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127 | Returns a negative value on error or exit request. If block is nonzero, |
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128 | block for events if none are queued. Optionally return the return value as |
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129 | specified with the main loop's quit() routine in the integer variable retval points |
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130 | to. On success returns the number of sources dispatched in this iteration. */ |
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131 | int pa_mainloop_iterate(pa_mainloop *m, int block, int *retval) { |
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132 | int r; |
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133 | |
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134 | if ( m == NULL ) |
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135 | return -1; |
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136 | |
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137 | r = pa_mainloop_prepare(m, block ? -1 : 0); |
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138 | |
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139 | if ( r > 0 ) |
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140 | r = pa_mainloop_poll(m); |
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141 | |
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142 | if ( r > 0 ) |
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143 | r = pa_mainloop_dispatch(m); |
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144 | |
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145 | if ( r == -2 && retval != NULL ) { |
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146 | *retval = m->quitval; |
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147 | } |
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148 | |
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149 | return r; |
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150 | } |
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151 | |
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152 | /** Run unlimited iterations of the main loop object until the main loop's quit() routine is called. */ |
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153 | int pa_mainloop_run(pa_mainloop *m, int *retval) { |
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154 | int r = 1; |
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155 | |
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156 | if ( m == NULL ) |
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157 | return -1; |
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158 | |
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159 | while (!(m->quit) && r > 0) { |
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160 | r = pa_mainloop_iterate(m, 1, retval); |
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161 | } |
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162 | |
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163 | if ( r == -2 ) |
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164 | return 1; |
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165 | |
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166 | if ( r < 0 ) |
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167 | return -1; |
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168 | |
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169 | return 0; |
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170 | } |
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171 | |
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172 | /** Return the abstract main loop abstraction layer vtable for this main loop. */ |
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173 | pa_mainloop_api* pa_mainloop_get_api(pa_mainloop*m) { |
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174 | if ( m == NULL ) |
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175 | return NULL; |
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176 | |
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177 | return &(m->api); |
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178 | } |
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179 | |
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180 | /** Shutdown the main loop */ |
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181 | void pa_mainloop_quit(pa_mainloop *m, int r) { |
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182 | if ( m == NULL ) |
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183 | return; |
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184 | |
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185 | m->quitval = r; |
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186 | m->quit = 1; |
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187 | } |
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188 | |
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189 | /** Interrupt a running poll (for threaded systems) */ |
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190 | void pa_mainloop_wakeup(pa_mainloop *m); |
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191 | |
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192 | /** Change the poll() implementation */ |
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193 | void pa_mainloop_set_poll_func(pa_mainloop *m, pa_poll_func poll_func, void *userdata) { |
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194 | if ( m == NULL ) |
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195 | return; |
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196 | |
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197 | m->poll_func = poll_func; |
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198 | m->poll_userdata = userdata; |
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199 | } |
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200 | |
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201 | //ll |
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