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<div class="title">json_batchallocator.h</div> </div>
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<a href="json__batchallocator_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// Copyright 2007-2010 Baptiste Lepilleur</span>
<a name="l00002"></a>00002 <span class="comment">// Distributed under MIT license, or public domain if desired and</span>
<a name="l00003"></a>00003 <span class="comment">// recognized in your jurisdiction.</span>
<a name="l00004"></a>00004 <span class="comment">// See file LICENSE for detail or copy at http://jsoncpp.sourceforge.net/LICENSE</span>
<a name="l00005"></a>00005
<a name="l00006"></a>00006 <span class="preprocessor">#ifndef JSONCPP_BATCHALLOCATOR_H_INCLUDED</span>
<a name="l00007"></a>00007 <span class="preprocessor"></span><span class="preprocessor"># define JSONCPP_BATCHALLOCATOR_H_INCLUDED</span>
<a name="l00008"></a>00008 <span class="preprocessor"></span>
<a name="l00009"></a>00009 <span class="preprocessor"># include <stdlib.h></span>
<a name="l00010"></a>00010 <span class="preprocessor"># include <assert.h></span>
<a name="l00011"></a>00011
<a name="l00012"></a>00012 <span class="preprocessor"># ifndef JSONCPP_DOC_EXCLUDE_IMPLEMENTATION</span>
<a name="l00013"></a>00013 <span class="preprocessor"></span>
<a name="l00014"></a>00014 <span class="keyword">namespace </span>Json {
<a name="l00015"></a>00015
<a name="l00016"></a>00016 <span class="comment">/* Fast memory allocator.</span>
<a name="l00017"></a>00017 <span class="comment"> *</span>
<a name="l00018"></a>00018 <span class="comment"> * This memory allocator allocates memory for a batch of object (specified by</span>
<a name="l00019"></a>00019 <span class="comment"> * the page size, the number of object in each page).</span>
<a name="l00020"></a>00020 <span class="comment"> *</span>
<a name="l00021"></a>00021 <span class="comment"> * It does not allow the destruction of a single object. All the allocated objects</span>
<a name="l00022"></a>00022 <span class="comment"> * can be destroyed at once. The memory can be either released or reused for future</span>
<a name="l00023"></a>00023 <span class="comment"> * allocation.</span>
<a name="l00024"></a>00024 <span class="comment"> * </span>
<a name="l00025"></a>00025 <span class="comment"> * The in-place new operator must be used to construct the object using the pointer</span>
<a name="l00026"></a>00026 <span class="comment"> * returned by allocate.</span>
<a name="l00027"></a>00027 <span class="comment"> */</span>
<a name="l00028"></a>00028 <span class="keyword">template</span><<span class="keyword">typename</span> AllocatedType
<a name="l00029"></a>00029 ,<span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> objectPerAllocation>
<a name="l00030"></a>00030 <span class="keyword">class </span>BatchAllocator
<a name="l00031"></a>00031 {
<a name="l00032"></a>00032 <span class="keyword">public</span>:
<a name="l00033"></a>00033 <span class="keyword">typedef</span> AllocatedType Type;
<a name="l00034"></a>00034
<a name="l00035"></a>00035 BatchAllocator( <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> objectsPerPage = 255 )
<a name="l00036"></a>00036 : freeHead_( 0 )
<a name="l00037"></a>00037 , objectsPerPage_( objectsPerPage )
<a name="l00038"></a>00038 {
<a name="l00039"></a>00039 <span class="comment">// printf( "Size: %d => %s\n", sizeof(AllocatedType), typeid(AllocatedType).name() );</span>
<a name="l00040"></a>00040 assert( <span class="keyword">sizeof</span>(AllocatedType) * objectPerAllocation >= <span class="keyword">sizeof</span>(AllocatedType *) ); <span class="comment">// We must be able to store a slist in the object free space.</span>
<a name="l00041"></a>00041 assert( objectsPerPage >= 16 );
<a name="l00042"></a>00042 batches_ = allocateBatch( 0 ); <span class="comment">// allocated a dummy page</span>
<a name="l00043"></a>00043 currentBatch_ = batches_;
<a name="l00044"></a>00044 }
<a name="l00045"></a>00045
<a name="l00046"></a>00046 ~BatchAllocator()
<a name="l00047"></a>00047 {
<a name="l00048"></a>00048 <span class="keywordflow">for</span> ( BatchInfo *batch = batches_; batch; )
<a name="l00049"></a>00049 {
<a name="l00050"></a>00050 BatchInfo *nextBatch = batch->next_;
<a name="l00051"></a>00051 free( batch );
<a name="l00052"></a>00052 batch = nextBatch;
<a name="l00053"></a>00053 }
<a name="l00054"></a>00054 }
<a name="l00055"></a>00055
<a name="l00058"></a>00058 AllocatedType *allocate()
<a name="l00059"></a>00059 {
<a name="l00060"></a>00060 <span class="keywordflow">if</span> ( freeHead_ ) <span class="comment">// returns node from free list.</span>
<a name="l00061"></a>00061 {
<a name="l00062"></a>00062 AllocatedType *<span class="keywordtype">object</span> = freeHead_;
<a name="l00063"></a>00063 freeHead_ = *(AllocatedType **)<span class="keywordtype">object</span>;
<a name="l00064"></a>00064 <span class="keywordflow">return</span> object;
<a name="l00065"></a>00065 }
<a name="l00066"></a>00066 <span class="keywordflow">if</span> ( currentBatch_->used_ == currentBatch_->end_ )
<a name="l00067"></a>00067 {
<a name="l00068"></a>00068 currentBatch_ = currentBatch_->next_;
<a name="l00069"></a>00069 <span class="keywordflow">while</span> ( currentBatch_ && currentBatch_->used_ == currentBatch_->end_ )
<a name="l00070"></a>00070 currentBatch_ = currentBatch_->next_;
<a name="l00071"></a>00071
<a name="l00072"></a>00072 <span class="keywordflow">if</span> ( !currentBatch_ ) <span class="comment">// no free batch found, allocate a new one</span>
<a name="l00073"></a>00073 {
<a name="l00074"></a>00074 currentBatch_ = allocateBatch( objectsPerPage_ );
<a name="l00075"></a>00075 currentBatch_->next_ = batches_; <span class="comment">// insert at the head of the list</span>
<a name="l00076"></a>00076 batches_ = currentBatch_;
<a name="l00077"></a>00077 }
<a name="l00078"></a>00078 }
<a name="l00079"></a>00079 AllocatedType *allocated = currentBatch_->used_;
<a name="l00080"></a>00080 currentBatch_->used_ += objectPerAllocation;
<a name="l00081"></a>00081 <span class="keywordflow">return</span> allocated;
<a name="l00082"></a>00082 }
<a name="l00083"></a>00083
<a name="l00086"></a>00086 <span class="keywordtype">void</span> release( AllocatedType *<span class="keywordtype">object</span> )
<a name="l00087"></a>00087 {
<a name="l00088"></a>00088 assert( <span class="keywordtype">object</span> != 0 );
<a name="l00089"></a>00089 *(AllocatedType **)<span class="keywordtype">object</span> = freeHead_;
<a name="l00090"></a>00090 freeHead_ = object;
<a name="l00091"></a>00091 }
<a name="l00092"></a>00092
<a name="l00093"></a>00093 <span class="keyword">private</span>:
<a name="l00094"></a>00094 <span class="keyword">struct </span>BatchInfo
<a name="l00095"></a>00095 {
<a name="l00096"></a>00096 BatchInfo *next_;
<a name="l00097"></a>00097 AllocatedType *used_;
<a name="l00098"></a>00098 AllocatedType *end_;
<a name="l00099"></a>00099 AllocatedType buffer_[objectPerAllocation];
<a name="l00100"></a>00100 };
<a name="l00101"></a>00101
<a name="l00102"></a>00102 <span class="comment">// disabled copy constructor and assignement operator.</span>
<a name="l00103"></a>00103 BatchAllocator( <span class="keyword">const</span> BatchAllocator & );
<a name="l00104"></a>00104 <span class="keywordtype">void</span> operator =( <span class="keyword">const</span> BatchAllocator &);
<a name="l00105"></a>00105
<a name="l00106"></a>00106 <span class="keyword">static</span> BatchInfo *allocateBatch( <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> objectsPerPage )
<a name="l00107"></a>00107 {
<a name="l00108"></a>00108 <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> mallocSize = <span class="keyword">sizeof</span>(BatchInfo) - <span class="keyword">sizeof</span>(AllocatedType)* objectPerAllocation
<a name="l00109"></a>00109 + <span class="keyword">sizeof</span>(AllocatedType) * objectPerAllocation * objectsPerPage;
<a name="l00110"></a>00110 BatchInfo *batch = <span class="keyword">static_cast<</span>BatchInfo*<span class="keyword">></span>( malloc( mallocSize ) );
<a name="l00111"></a>00111 batch->next_ = 0;
<a name="l00112"></a>00112 batch->used_ = batch->buffer_;
<a name="l00113"></a>00113 batch->end_ = batch->buffer_ + objectsPerPage;
<a name="l00114"></a>00114 <span class="keywordflow">return</span> batch;
<a name="l00115"></a>00115 }
<a name="l00116"></a>00116
<a name="l00117"></a>00117 BatchInfo *batches_;
<a name="l00118"></a>00118 BatchInfo *currentBatch_;
<a name="l00120"></a>00120 AllocatedType *freeHead_;
<a name="l00121"></a>00121 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> objectsPerPage_;
<a name="l00122"></a>00122 };
<a name="l00123"></a>00123
<a name="l00124"></a>00124
<a name="l00125"></a>00125 } <span class="comment">// namespace Json</span>
<a name="l00126"></a>00126
<a name="l00127"></a>00127 <span class="preprocessor"># endif // ifndef JSONCPP_DOC_INCLUDE_IMPLEMENTATION</span>
<a name="l00128"></a>00128 <span class="preprocessor"></span>
<a name="l00129"></a>00129 <span class="preprocessor">#endif // JSONCPP_BATCHALLOCATOR_H_INCLUDED</span>
<a name="l00130"></a>00130 <span class="preprocessor"></span>
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