Mercurial > SDL_sound_CoreAudio
annotate extra_rwops.c @ 572:7815c90ba552
Don't force quit in signal handler, since we might double-free things.
Instead we set a flag and clean up normally.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Sun, 24 Jan 2010 13:45:18 -0500 |
| parents | 2e8907ff98e9 |
| children |
| rev | line source |
|---|---|
| 8 | 1 /* |
| 2 * SDL_sound -- An abstract sound format decoding API. | |
| 3 * Copyright (C) 2001 Ryan C. Gordon. | |
| 4 * | |
| 5 * This library is free software; you can redistribute it and/or | |
| 6 * modify it under the terms of the GNU Lesser General Public | |
| 7 * License as published by the Free Software Foundation; either | |
| 8 * version 2.1 of the License, or (at your option) any later version. | |
| 9 * | |
| 10 * This library is distributed in the hope that it will be useful, | |
| 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 * Lesser General Public License for more details. | |
| 14 * | |
| 15 * You should have received a copy of the GNU Lesser General Public | |
| 16 * License along with this library; if not, write to the Free Software | |
| 17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 */ | |
| 19 | |
| 20 /* | |
| 21 * Some extra RWops that are needed or are just handy to have. | |
| 22 * | |
|
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23 * Please see the file LICENSE.txt in the source's root directory. |
| 8 | 24 * |
|
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25 * This file written by Ryan C. Gordon. (icculus@icculus.org) |
| 8 | 26 */ |
| 27 | |
| 28 #include <stdio.h> | |
| 29 #include <stdlib.h> | |
| 30 #include "SDL.h" | |
| 31 | |
| 32 | |
| 33 /* | |
| 34 * The Reference Counter RWops... | |
| 35 */ | |
| 36 | |
| 37 | |
| 38 typedef struct | |
| 39 { | |
| 40 SDL_RWops *rw; /* The actual RWops we're refcounting... */ | |
| 41 int refcount; /* The refcount; starts at 1. If goes to 0, delete. */ | |
| 42 } RWRefCounterData; | |
| 43 | |
| 44 | |
| 45 /* Just pass through to the actual SDL_RWops's method... */ | |
| 46 static int refcounter_seek(SDL_RWops *rw, int offset, int whence) | |
| 47 { | |
| 48 RWRefCounterData *data = (RWRefCounterData *) rw->hidden.unknown.data1; | |
| 49 return(data->rw->seek(data->rw, offset, whence)); | |
| 50 } /* refcounter_seek */ | |
| 51 | |
| 52 | |
| 53 /* Just pass through to the actual SDL_RWops's method... */ | |
| 54 static int refcounter_read(SDL_RWops *rw, void *ptr, int size, int maxnum) | |
| 55 { | |
| 56 RWRefCounterData *data = (RWRefCounterData *) rw->hidden.unknown.data1; | |
| 57 return(data->rw->read(data->rw, ptr, size, maxnum)); | |
| 58 } /* refcounter_read */ | |
| 59 | |
| 60 | |
| 61 /* Just pass through to the actual SDL_RWops's method... */ | |
| 62 static int refcounter_write(SDL_RWops *rw, const void *ptr, int size, int num) | |
| 63 { | |
| 64 RWRefCounterData *data = (RWRefCounterData *) rw->hidden.unknown.data1; | |
| 65 return(data->rw->write(data->rw, ptr, size, num)); | |
| 66 } /* refcounter_write */ | |
| 67 | |
| 68 | |
| 69 /* | |
| 70 * Decrement the reference count. If there are no more references, pass | |
| 71 * through to the actual SDL_RWops's method, and then clean ourselves up. | |
| 72 */ | |
| 73 static int refcounter_close(SDL_RWops *rw) | |
| 74 { | |
| 75 int retval = 0; | |
| 76 RWRefCounterData *data = (RWRefCounterData *) rw->hidden.unknown.data1; | |
| 77 data->refcount--; | |
| 78 if (data->refcount <= 0) | |
| 79 { | |
| 80 retval = data->rw->close(data->rw); | |
| 81 free(data); | |
| 82 SDL_FreeRW(rw); | |
| 83 } /* if */ | |
| 84 | |
| 85 return(retval); | |
| 86 } /* refcounter_close */ | |
| 87 | |
| 88 | |
| 89 void RWops_RWRefCounter_addRef(SDL_RWops *rw) | |
| 90 { | |
| 91 RWRefCounterData *data = (RWRefCounterData *) rw->hidden.unknown.data1; | |
| 92 data->refcount++; | |
| 93 } /* RWops_RWRefCounter_addRef */ | |
| 94 | |
| 95 | |
| 96 SDL_RWops *RWops_RWRefCounter_new(SDL_RWops *rw) | |
| 97 { | |
| 98 SDL_RWops *retval = NULL; | |
| 99 | |
| 100 if (rw == NULL) | |
| 101 { | |
| 102 SDL_SetError("NULL argument to RWops_RWRefCounter_new()."); | |
| 103 return(NULL); | |
| 104 } /* if */ | |
| 105 | |
| 106 retval = SDL_AllocRW(); | |
| 107 if (retval != NULL) | |
| 108 { | |
| 109 RWRefCounterData *data; | |
| 110 data = (RWRefCounterData *) malloc(sizeof (RWRefCounterData)); | |
| 111 if (data == NULL) | |
| 112 { | |
|
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113 SDL_SetError("Out of memory."); |
| 8 | 114 SDL_FreeRW(retval); |
| 115 retval = NULL; | |
| 116 } /* if */ | |
| 117 else | |
| 118 { | |
| 119 data->rw = rw; | |
| 120 data->refcount = 1; | |
| 121 retval->hidden.unknown.data1 = data; | |
| 122 retval->seek = refcounter_seek; | |
| 123 retval->read = refcounter_read; | |
| 124 retval->write = refcounter_write; | |
| 125 retval->close = refcounter_close; | |
| 126 } /* else */ | |
| 127 } /* if */ | |
| 128 | |
| 129 return(retval); | |
| 130 } /* RWops_RWRefCounter_new */ | |
| 131 | |
| 132 | |
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133 |
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134 /* |
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135 * RWops pooling... |
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136 */ |
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137 |
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138 static SDL_RWops *rwops_pool = NULL; |
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139 static SDL_mutex *rwops_pool_mutex = NULL; |
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140 |
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141 SDL_RWops *RWops_pooled_alloc(void) |
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142 { |
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143 SDL_RWops *rw; |
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144 if (rwops_pool_mutex == NULL) |
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145 return(NULL); /* never initialized. */ |
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146 |
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147 SDL_LockMutex(rwops_pool_mutex); |
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148 rw = rwops_pool; |
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149 if (rw) |
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150 rwops_pool = (SDL_RWops *) (rw->hidden.unknown.data1); |
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151 SDL_UnlockMutex(rwops_pool_mutex); |
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152 |
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153 if (!rw) |
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154 rw = (SDL_RWops *) malloc(sizeof (SDL_RWops)); |
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155 |
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156 return(rw); |
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157 } /* RWops_pooled_alloc */ |
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158 |
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159 |
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160 void RWops_pooled_free(SDL_RWops *rw) |
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161 { |
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162 if (rwops_pool_mutex == NULL) |
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163 return; /* never initialized...why are we here? */ |
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164 |
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165 if (rw == NULL) |
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166 return; |
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167 |
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168 SDL_LockMutex(rwops_pool_mutex); |
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169 rw->hidden.unknown.data1 = rwops_pool; |
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170 rwops_pool = rw; |
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171 SDL_UnlockMutex(rwops_pool_mutex); |
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172 } /* RWops_pooled_free */ |
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173 |
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174 |
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175 int RWops_pooled_init(void) |
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176 { |
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177 const int preallocate = 50; |
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178 int i; |
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179 |
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180 rwops_pool_mutex = SDL_CreateMutex(); |
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181 if (rwops_pool_mutex == NULL) |
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182 return(0); |
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183 |
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184 for (i = 0; i < preallocate; i++) |
| 490 | 185 RWops_pooled_free(RWops_pooled_alloc()); |
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186 |
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187 return(1); |
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188 } /* RWops_pooled_init */ |
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189 |
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190 |
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191 void RWops_pooled_deinit(void) |
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192 { |
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193 SDL_RWops *cur; |
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194 SDL_RWops *next; |
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195 |
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196 if (rwops_pool_mutex == NULL) |
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197 return; /* never initialized. */ |
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198 |
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199 SDL_LockMutex(rwops_pool_mutex); |
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200 /* all allocated rwops must be in the pool now, or the memory leaks. */ |
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201 cur = rwops_pool; |
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202 rwops_pool = NULL; |
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203 SDL_UnlockMutex(rwops_pool_mutex); |
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204 SDL_DestroyMutex(rwops_pool_mutex); |
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205 rwops_pool_mutex = NULL; |
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206 |
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207 while (cur) |
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208 { |
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209 next = (SDL_RWops *) (cur->hidden.unknown.data1); |
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210 free(cur); |
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211 cur = next; |
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212 } /* while */ |
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213 } /* RWops_pooled_deinit */ |
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214 |
| 8 | 215 /* end of extra_rwops.c ... */ |
| 216 | |
| 217 |