author | rubidium |
Sun, 12 Aug 2007 18:32:47 +0000 | |
branch | NewGRF_ports |
changeset 6800 | 6c09e1e86fcb |
parent 6743 | cabfaa4a0295 |
child 6868 | 7eb395287b3d |
permissions | -rw-r--r-- |
2186 | 1 |
/* $Id$ */ |
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/** @file oldpool.h */ |
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#ifndef OLDPOOL_H |
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#define OLDPOOL_H |
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/* The function that is called after a new block is added |
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start_item is the first item of the new made block */ |
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typedef void OldMemoryPoolNewBlock(uint start_item); |
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/* The function that is called before a block is cleaned up */ |
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typedef void OldMemoryPoolCleanBlock(uint start_item, uint end_item); |
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/** |
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* Stuff for dynamic vehicles. Use the wrappers to access the OldMemoryPool |
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* please try to avoid manual calls! |
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*/ |
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struct OldMemoryPoolBase { |
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void CleanPool(); |
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bool AddBlockToPool(); |
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bool AddBlockIfNeeded(uint index); |
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protected: |
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OldMemoryPoolBase(const char *name, uint max_blocks, uint block_size_bits, uint item_size, |
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OldMemoryPoolNewBlock *new_block_proc, OldMemoryPoolCleanBlock *clean_block_proc) : |
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name(name), max_blocks(max_blocks), block_size_bits(block_size_bits), |
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new_block_proc(new_block_proc), clean_block_proc(clean_block_proc), current_blocks(0), |
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total_items(0), cleaning_pool(false), item_size(item_size), first_free_index(0), blocks(NULL) {} |
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const char* name; ///< Name of the pool (just for debugging) |
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const uint max_blocks; ///< The max amount of blocks this pool can have |
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const uint block_size_bits; ///< The size of each block in bits |
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/// Pointer to a function that is called after a new block is added |
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OldMemoryPoolNewBlock *new_block_proc; |
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/// Pointer to a function that is called to clean a block |
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OldMemoryPoolCleanBlock *clean_block_proc; |
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uint current_blocks; ///< How many blocks we have in our pool |
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uint total_items; ///< How many items we now have in this pool |
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bool cleaning_pool; ///< Are we currently cleaning the pool? |
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public: |
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const uint item_size; ///< How many bytes one block is |
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uint first_free_index; ///< The index of the first free pool item in this pool |
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byte **blocks; ///< An array of blocks (one block hold all the items) |
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/** |
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* Get the size of this pool, i.e. the total number of items you |
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* can put into it at the current moment; the pool might still |
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* be able to increase the size of the pool. |
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* @return the size of the pool |
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*/ |
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inline uint GetSize() const |
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{ |
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return this->total_items; |
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} |
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/** |
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* Can this pool allocate more blocks, i.e. is the maximum amount |
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* of allocated blocks not yet reached? |
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* @return the if and only if the amount of allocable blocks is |
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* less than the amount of allocated blocks. |
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*/ |
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inline bool CanAllocateMoreBlocks() const |
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{ |
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return this->current_blocks < this->max_blocks; |
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} |
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/** |
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* Get the maximum number of allocable blocks. |
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* @return the numebr of blocks |
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*/ |
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inline uint GetBlockCount() const |
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{ |
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return this->current_blocks; |
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} |
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/** |
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* Get the name of this pool. |
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* @return the name |
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*/ |
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inline const char *GetName() const |
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{ |
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return this->name; |
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} |
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/** |
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* Is the pool in the cleaning phase? |
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* @return true if it is |
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*/ |
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inline bool CleaningPool() const |
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{ |
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return this->cleaning_pool; |
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} |
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}; |
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template <typename T> |
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struct OldMemoryPool : public OldMemoryPoolBase { |
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OldMemoryPool(const char *name, uint max_blocks, uint block_size_bits, uint item_size, |
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OldMemoryPoolNewBlock *new_block_proc, OldMemoryPoolCleanBlock *clean_block_proc) : |
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OldMemoryPoolBase(name, max_blocks, block_size_bits, item_size, new_block_proc, clean_block_proc) {} |
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/** |
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* Get the pool entry at the given index. |
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* @param index the index into the pool |
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* @pre index < this->GetSize() |
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* @return the pool entry. |
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*/ |
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111 |
inline T *Get(uint index) const |
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112 |
{ |
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assert(index < this->GetSize()); |
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return (T*)(this->blocks[index >> this->block_size_bits] + |
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(index & ((1 << this->block_size_bits) - 1)) * this->item_size); |
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} |
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}; |
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118 |
|
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119 |
/** |
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* Generic function to initialize a new block in a pool. |
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* @param start_item the first item that needs to be initialized |
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122 |
*/ |
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template <typename T, OldMemoryPool<T> *Tpool> |
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static void PoolNewBlock(uint start_item) |
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125 |
{ |
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for (T *t = Tpool->Get(start_item); t != NULL; t = (t->index + 1U < Tpool->GetSize()) ? Tpool->Get(t->index + 1U) : NULL) { |
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t = new (t) T(); |
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t->index = start_item++; |
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129 |
} |
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130 |
} |
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131 |
|
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132 |
/** |
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133 |
* Generic function to free a new block in a pool. |
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134 |
* @param start_item the first item that needs to be cleaned |
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* @param end_item the last item that needs to be cleaned |
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136 |
*/ |
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137 |
template <typename T, OldMemoryPool<T> *Tpool> |
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138 |
static void PoolCleanBlock(uint start_item, uint end_item) |
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139 |
{ |
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140 |
for (uint i = start_item; i <= end_item; i++) { |
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T *t = Tpool->Get(i); |
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delete t; |
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143 |
} |
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144 |
} |
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145 |
|
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146 |
|
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147 |
/** |
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148 |
* Generalization for all pool items that are saved in the savegame. |
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149 |
* It specifies all the mechanics to access the pool easily. |
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150 |
*/ |
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151 |
template <typename T, typename Tid, OldMemoryPool<T> *Tpool> |
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152 |
struct PoolItem { |
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153 |
/** |
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154 |
* The pool-wide index of this object. |
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155 |
*/ |
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156 |
Tid index; |
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157 |
|
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158 |
/** |
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159 |
* We like to have the correct class destructed. |
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160 |
*/ |
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161 |
virtual ~PoolItem() |
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162 |
{ |
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163 |
if (this->index < Tpool->first_free_index) Tpool->first_free_index = this->index; |
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164 |
} |
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165 |
|
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166 |
/** |
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167 |
* An overriden version of new that allocates memory on the pool. |
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168 |
* @param size the size of the variable (unused) |
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169 |
* @return the memory that is 'allocated' |
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170 |
*/ |
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171 |
void *operator new(size_t size) |
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172 |
{ |
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173 |
return AllocateRaw(); |
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174 |
} |
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175 |
|
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176 |
/** |
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177 |
* 'Free' the memory allocated by the overriden new. |
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178 |
* @param p the memory to 'free' |
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179 |
*/ |
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180 |
void operator delete(void *p) |
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181 |
{ |
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182 |
} |
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183 |
|
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184 |
/** |
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185 |
* An overriden version of new, so you can directly allocate a new object with |
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186 |
* the correct index when one is loading the savegame. |
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187 |
* @param size the size of the variable (unused) |
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188 |
* @param index the index of the object |
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189 |
* @return the memory that is 'allocated' |
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190 |
*/ |
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191 |
void *operator new(size_t size, int index) |
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192 |
{ |
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193 |
if (!Tpool->AddBlockIfNeeded(index)) error("%s: failed loading savegame: too many %s", Tpool->GetName(), Tpool->GetName()); |
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194 |
|
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195 |
return Tpool->Get(index); |
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196 |
} |
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197 |
|
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198 |
/** |
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199 |
* 'Free' the memory allocated by the overriden new. |
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200 |
* @param p the memory to 'free' |
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201 |
* @param index the original parameter given to create the memory |
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202 |
*/ |
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203 |
void operator delete(void *p, int index) |
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204 |
{ |
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205 |
} |
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206 |
|
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207 |
/** |
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208 |
* An overriden version of new, so you can use the vehicle instance |
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209 |
* instead of a newly allocated piece of memory. |
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210 |
* @param size the size of the variable (unused) |
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211 |
* @param pn the already existing object to use as 'storage' backend |
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* @return the memory that is 'allocated' |
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213 |
*/ |
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214 |
void *operator new(size_t size, T *pn) |
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215 |
{ |
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return pn; |
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217 |
} |
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218 |
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/** |
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* 'Free' the memory allocated by the overriden new. |
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* @param p the memory to 'free' |
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* @param pn the pointer that was given to 'new' on creation. |
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*/ |
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void operator delete(void *p, T *pn) |
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{ |
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} |
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/** |
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* Is this a valid object or not? |
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* @return true if and only if it is valid |
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*/ |
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virtual bool IsValid() const |
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{ |
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return false; |
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} |
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private: |
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/** |
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* Allocate a pool item; possibly allocate a new block in the pool. |
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* @param first the first pool item to start searching |
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* @pre first <= Tpool->GetSize() |
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* @return the allocated pool item (or NULL when the pool is full). |
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*/ |
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static inline T *AllocateSafeRaw(uint &first) |
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{ |
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uint last_minus_one = Tpool->GetSize() - 1; |
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for (T *t = Tpool->Get(first); t != NULL; t = (t->index < last_minus_one) ? Tpool->Get(t->index + 1U) : NULL) { |
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if (!t->IsValid()) { |
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first = t->index; |
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Tid index = t->index; |
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|
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memset(t, 0, Tpool->item_size); |
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t->index = index; |
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return t; |
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} |
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} |
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|
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/* Check if we can add a block to the pool */ |
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if (Tpool->AddBlockToPool()) return AllocateRaw(first); |
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return NULL; |
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} |
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|
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protected: |
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/** |
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* Allocate a pool item; possibly allocate a new block in the pool. |
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* @return the allocated pool item (or NULL when the pool is full). |
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*/ |
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static inline T *AllocateRaw() |
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{ |
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return AllocateSafeRaw(Tpool->first_free_index); |
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} |
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275 |
/** |
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* Allocate a pool item; possibly allocate a new block in the pool. |
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* @param first the first pool item to start searching |
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* @return the allocated pool item (or NULL when the pool is full). |
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*/ |
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static inline T *AllocateRaw(uint &first) |
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{ |
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if (first >= Tpool->GetSize() && !Tpool->AddBlockToPool()) return NULL; |
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|
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return AllocateSafeRaw(first); |
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} |
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286 |
|
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287 |
/** |
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* Are we cleaning this pool? |
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* @return true if we are |
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*/ |
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static inline bool CleaningPool() |
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{ |
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return Tpool->CleaningPool(); |
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} |
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}; |
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|
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297 |
|
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#define OLD_POOL_ENUM(name, type, block_size_bits, max_blocks) \ |
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enum { \ |
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name##_POOL_BLOCK_SIZE_BITS = block_size_bits, \ |
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name##_POOL_MAX_BLOCKS = max_blocks \ |
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}; |
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303 |
|
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304 |
|
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#define OLD_POOL_ACCESSORS(name, type) \ |
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static inline type* Get##name(uint index) { return _##name##_pool.Get(index); } \ |
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static inline uint Get##name##PoolSize() { return _##name##_pool.GetSize(); } |
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|
308 |
|
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309 |
|
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310 |
#define DECLARE_OLD_POOL(name, type, block_size_bits, max_blocks) \ |
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311 |
OLD_POOL_ENUM(name, type, block_size_bits, max_blocks) \ |
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extern OldMemoryPool<type> _##name##_pool; \ |
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OLD_POOL_ACCESSORS(name, type) |
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|
314 |
|
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315 |
|
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#define DEFINE_OLD_POOL(name, type, new_block_proc, clean_block_proc) \ |
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OldMemoryPool<type> _##name##_pool( \ |
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#name, name##_POOL_MAX_BLOCKS, name##_POOL_BLOCK_SIZE_BITS, sizeof(type), \ |
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new_block_proc, clean_block_proc); |
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320 |
|
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#define DEFINE_OLD_POOL_GENERIC(name, type) \ |
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OldMemoryPool<type> _##name##_pool( \ |
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#name, name##_POOL_MAX_BLOCKS, name##_POOL_BLOCK_SIZE_BITS, sizeof(type), \ |
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PoolNewBlock<type, &_##name##_pool>, PoolCleanBlock<type, &_##name##_pool>); |
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(svn r7331) - Codechange: Rename all memory pool macro's and types to "old pool", so the new pool implementation can be committed alongside it.
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#define STATIC_OLD_POOL(name, type, block_size_bits, max_blocks, new_block_proc, clean_block_proc) \ |
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OLD_POOL_ENUM(name, type, block_size_bits, max_blocks) \ |
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static DEFINE_OLD_POOL(name, type, new_block_proc, clean_block_proc) \ |
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OLD_POOL_ACCESSORS(name, type) |
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#endif /* OLDPOOL_H */ |