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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"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// Copyright 2007-2010 Baptiste Lepilleur</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">// Distributed under MIT license, or public domain if desired and</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// recognized in your jurisdiction.</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">// See file LICENSE for detail or copy at http://jsoncpp.sourceforge.net/LICENSE</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> </div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="preprocessor">#ifndef JSONCPP_BATCHALLOCATOR_H_INCLUDED</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="preprocessor"></span><span class="preprocessor"># define JSONCPP_BATCHALLOCATOR_H_INCLUDED</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor"># include <stdlib.h></span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor"># include <assert.h></span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> </div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor"># ifndef JSONCPP_DOC_EXCLUDE_IMPLEMENTATION</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="keyword">namespace </span>Json {</div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> </div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment">/* Fast memory allocator.</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> * This memory allocator allocates memory for a batch of object (specified by</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> * the page size, the number of object in each page).</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> * It does not allow the destruction of a single object. All the allocated objects</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment"> * can be destroyed at once. The memory can be either released or reused for future</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment"> * allocation.</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment"> * </span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment"> * The in-place new operator must be used to construct the object using the pointer</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> * returned by allocate.</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="keyword">template</span><<span class="keyword">typename</span> AllocatedType</div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  ,<span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> objectPerAllocation></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="keyword">class </span>BatchAllocator</div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> {</div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="keyword">public</span>:</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  <span class="keyword">typedef</span> AllocatedType Type;</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> </div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  BatchAllocator( <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> objectsPerPage = 255 )</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  : freeHead_( 0 )</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  , objectsPerPage_( objectsPerPage )</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  {</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment">// printf( "Size: %d => %s\n", sizeof(AllocatedType), typeid(AllocatedType).name() );</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  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></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  assert( objectsPerPage >= 16 );</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  batches_ = allocateBatch( 0 ); <span class="comment">// allocated a dummy page</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  currentBatch_ = batches_;</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  }</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> </div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  ~BatchAllocator()</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  {</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="keywordflow">for</span> ( BatchInfo *batch = batches_; batch; )</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  {</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  BatchInfo *nextBatch = batch->next_;</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  free( batch );</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  batch = nextBatch;</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  }</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  }</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> </div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  AllocatedType *allocate()</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  {</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="keywordflow">if</span> ( freeHead_ ) <span class="comment">// returns node from free list.</span></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  {</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  AllocatedType *<span class="keywordtype">object</span> = freeHead_;</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  freeHead_ = *(AllocatedType **)<span class="keywordtype">object</span>;</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="keywordflow">return</span> object;</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  }</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="keywordflow">if</span> ( currentBatch_->used_ == currentBatch_->end_ )</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  {</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  currentBatch_ = currentBatch_->next_;</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keywordflow">while</span> ( currentBatch_ && currentBatch_->used_ == currentBatch_->end_ )</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  currentBatch_ = currentBatch_->next_;</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> </div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="keywordflow">if</span> ( !currentBatch_ ) <span class="comment">// no free batch found, allocate a new one</span></div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  { </div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  currentBatch_ = allocateBatch( objectsPerPage_ );</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  currentBatch_->next_ = batches_; <span class="comment">// insert at the head of the list</span></div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  batches_ = currentBatch_;</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  }</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  }</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  AllocatedType *allocated = currentBatch_->used_;</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  currentBatch_->used_ += objectPerAllocation;</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keywordflow">return</span> allocated;</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  }</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span> </div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keywordtype">void</span> release( AllocatedType *<span class="keywordtype">object</span> )</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  {</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  assert( <span class="keywordtype">object</span> != 0 );</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  *(AllocatedType **)<span class="keywordtype">object</span> = freeHead_;</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  freeHead_ = object;</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  }</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span> </div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span> <span class="keyword">private</span>:</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="keyword">struct </span>BatchInfo</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  {</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  BatchInfo *next_;</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  AllocatedType *used_;</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  AllocatedType *end_;</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  AllocatedType buffer_[objectPerAllocation];</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  };</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span> </div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="comment">// disabled copy constructor and assignement operator.</span></div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  BatchAllocator( <span class="keyword">const</span> BatchAllocator & );</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="keywordtype">void</span> operator =( <span class="keyword">const</span> BatchAllocator &);</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span> </div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="keyword">static</span> BatchInfo *allocateBatch( <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> objectsPerPage )</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  {</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <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</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  + <span class="keyword">sizeof</span>(AllocatedType) * objectPerAllocation * objectsPerPage;</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  BatchInfo *batch = <span class="keyword">static_cast<</span>BatchInfo*<span class="keyword">></span>( malloc( mallocSize ) );</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  batch->next_ = 0;</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  batch->used_ = batch->buffer_;</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  batch->end_ = batch->buffer_ + objectsPerPage;</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  <span class="keywordflow">return</span> batch;</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  }</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span> </div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  BatchInfo *batches_;</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  BatchInfo *currentBatch_;</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  AllocatedType *freeHead_;</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> objectsPerPage_;</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span> };</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span> </div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span> </div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span> } <span class="comment">// namespace Json</span></div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span> </div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span> <span class="preprocessor"># endif // ifndef JSONCPP_DOC_INCLUDE_IMPLEMENTATION</span></div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span> <span class="preprocessor">#endif // JSONCPP_BATCHALLOCATOR_H_INCLUDED</span></div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span> <span class="preprocessor"></span></div>
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