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<div class="headertitle"><div class="title">item_alloc</div></div>
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<a href="item__alloc.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span><span class="comment">// -*- Mode: C++ -*-</span></div>
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<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span><span class="comment">// vim:ft=cpp</span></div>
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<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="comment">/*</span></div>
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<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="comment"> * (c) 2008-2009 Adam Lackorzynski <adam@os.inf.tu-dresden.de>,</span></div>
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<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><span class="comment"> * Alexander Warg <warg@os.inf.tu-dresden.de></span></div>
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<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span><span class="comment"> * economic rights: Technische Universität Dresden (Germany)</span></div>
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<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span><span class="comment"> *</span></div>
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<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span><span class="comment"> * License: see LICENSE.spdx (in this directory or the directories above)</span></div>
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<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span><span class="comment"> */</span></div>
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<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span> </div>
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<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span><span class="preprocessor">#pragma once</span></div>
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<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span> </div>
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<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span><span class="preprocessor">#include <l4/cxx/bitmap></span></div>
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<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span> </div>
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<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceL4Re.html">L4Re</a> { <span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceL4Re_1_1Util.html">Util</a> {</div>
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<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span> </div>
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<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span><span class="keyword">using </span>cxx::Bitmap_base;</div>
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<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span><span class="keyword">using </span>cxx::Bitmap;</div>
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<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span></div>
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<div class="foldopen" id="foldopen00027" data-start="{" data-end="};">
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<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"><a class="line" href="classL4Re_1_1Util_1_1Item__alloc__base.html"> 27</a></span><span class="keyword">class </span>Item_alloc_base</div>
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<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span>{</div>
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<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span><span class="keyword">private</span>:</div>
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<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span> <span class="keywordtype">long</span> _capacity;</div>
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<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span> <span class="keywordtype">long</span> _free_hint;</div>
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<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span> <a class="code hl_class" href="classcxx_1_1Bitmap__base.html">Bitmap_base</a> _bits;</div>
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<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span> </div>
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<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span> <span class="keywordtype">void</span> hint(<span class="keywordtype">long</span> hint)</div>
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<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span> { __atomic_store_n(&_free_hint, hint, __ATOMIC_RELAXED); }</div>
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<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span> </div>
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<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span><span class="keyword">public</span>:</div>
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<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span> <span class="keywordtype">bool</span> is_allocated(<span class="keywordtype">long</span> item) <span class="keyword">const</span> <span class="keyword">noexcept</span></div>
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<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span> { <span class="keywordflow">return</span> _bits[item]; }</div>
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<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span> </div>
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<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span> <span class="keywordtype">long</span> hint()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> __atomic_load_n(&_free_hint, __ATOMIC_RELAXED); }</div>
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<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span> </div>
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<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span> <span class="keywordtype">bool</span> alloc(<span class="keywordtype">long</span> item) <span class="keyword">noexcept</span></div>
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<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span> {</div>
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<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span> <span class="keywordflow">return</span> !_bits.atomic_get_and_set(item);</div>
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<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span> }</div>
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<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> </div>
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<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> <span class="keywordtype">void</span> free(<span class="keywordtype">long</span> item) <span class="keyword">noexcept</span></div>
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<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span> {</div>
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<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span> <span class="keywordflow">if</span> (item < hint())</div>
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<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span> hint(item);</div>
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<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span> </div>
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<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span> _bits.atomic_clear_bit(item);</div>
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<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span> }</div>
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<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span> </div>
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<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span> Item_alloc_base(<span class="keywordtype">long</span> size, <span class="keywordtype">void</span> *mem) noexcept</div>
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<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span> : _capacity(size), _free_hint(0), _bits(mem)</div>
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<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span> {}</div>
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<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span> </div>
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<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> <span class="keywordtype">long</span> alloc() <span class="keyword">noexcept</span></div>
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<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> {</div>
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<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> <span class="keywordtype">long</span> free_hint = hint();</div>
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<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> </div>
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<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> <span class="keywordflow">for</span> (<span class="keywordtype">long</span> i = free_hint; i < _capacity; ++i)</div>
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<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> <span class="keywordflow">if</span> (alloc(i))</div>
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<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> {</div>
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<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> hint(i + 1);</div>
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<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> <span class="keywordflow">return</span> i;</div>
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<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> }</div>
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<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> </div>
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<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> <span class="comment">// _free_hint is not necessarily correct in case of multi-threading! Make</span></div>
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<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> <span class="comment">// sure we don't miss any potentially free slots.</span></div>
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<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span> <span class="keywordflow">for</span> (<span class="keywordtype">long</span> i = 0; i < free_hint && i < _capacity; ++i)</div>
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<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span> <span class="keywordflow">if</span> (alloc(i))</div>
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<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span> {</div>
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<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span> hint(i + 1);</div>
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<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span> <span class="keywordflow">return</span> i;</div>
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<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span> }</div>
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<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span> </div>
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<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span> <span class="keywordflow">return</span> -1;</div>
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<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span> }</div>
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<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span> </div>
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<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span> <span class="keywordtype">long</span> size() <span class="keyword">const</span> <span class="keyword">noexcept</span></div>
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<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span> {</div>
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<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span> <span class="keywordflow">return</span> _capacity;</div>
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<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span> }</div>
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<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span>};</div>
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</div>
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<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span> </div>
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<div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span><span class="keyword">template</span>< <span class="keywordtype">long</span> Bits ></div>
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<div class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span><span class="keyword">class </span>Item_alloc : <span class="keyword">public</span> <a class="code hl_class" href="classL4Re_1_1Util_1_1Item__alloc__base.html">Item_alloc_base</a></div>
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<div class="line"><a id="l00091" name="l00091"></a><span class="lineno"> 91</span>{</div>
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<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span><span class="keyword">private</span>:</div>
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<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span> <span class="keyword">typename</span> Bitmap_base::Word<Bits>::Type _bits[Bitmap_base::Word<Bits>::Size];</div>
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<div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span> </div>
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<div class="line"><a id="l00095" name="l00095"></a><span class="lineno"> 95</span><span class="keyword">public</span>:</div>
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<div class="line"><a id="l00096" name="l00096"></a><span class="lineno"> 96</span> Item_alloc() noexcept : <a class="code hl_class" href="classL4Re_1_1Util_1_1Item__alloc__base.html">Item_alloc_base</a>(Bits, _bits) {}</div>
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<div class="line"><a id="l00097" name="l00097"></a><span class="lineno"> 97</span>};</div>
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<div class="line"><a id="l00098" name="l00098"></a><span class="lineno"> 98</span> </div>
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<div class="line"><a id="l00099" name="l00099"></a><span class="lineno"> 99</span>}}</div>
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<div class="ttc" id="aclassL4Re_1_1Util_1_1Item__alloc__base_html"><div class="ttname"><a href="classL4Re_1_1Util_1_1Item__alloc__base.html">L4Re::Util::Item_alloc_base</a></div><div class="ttdoc">Item allocator.</div><div class="ttdef"><b>Definition</b> <a href="#l00027">item_alloc:28</a></div></div>
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<div class="ttc" id="aclasscxx_1_1Bitmap__base_html"><div class="ttname"><a href="classcxx_1_1Bitmap__base.html">cxx::Bitmap_base</a></div><div class="ttdoc">Basic bitmap abstraction.</div><div class="ttdef"><b>Definition</b> <a href="bitmap_source.html#l00018">bitmap:19</a></div></div>
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<div class="ttc" id="anamespaceL4Re_1_1Util_html"><div class="ttname"><a href="namespaceL4Re_1_1Util.html">L4Re::Util</a></div><div class="ttdoc">Documentation of the L4 Runtime Environment utility functionality in C++.</div><div class="ttdef"><b>Definition</b> <a href="pkg_2l4re-core_2l4re_2doc_2l4re_8dox_source.html#l00021">l4re.dox:21</a></div></div>
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<div class="ttc" id="anamespaceL4Re_html"><div class="ttname"><a href="namespaceL4Re.html">L4Re</a></div><div class="ttdoc">L4Re C++ Interfaces.</div><div class="ttdef"><b>Definition</b> <a href="cmd__control_source.html#l00014">cmd_control:14</a></div></div>
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<li class="navelem"><b>l4</b></li><li class="navelem"><b>re</b></li><li class="navelem"><b>util</b></li><li class="navelem"><a href="item__alloc.html">item_alloc</a></li>
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