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<a href="poolcontainer_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">/// @file include/dmlite/cpp/utils/poolcontainer.h</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"></span><span class="comment">/// @brief Pooling</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"></span><span class="comment">/// @author Alejandro Álvarez Ayllón <aalvarez@cern.ch></span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"></span><span class="preprocessor">#ifndef DMLITE_CPP_UTILS_POOLCONTAINER_H</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="preprocessor"></span><span class="preprocessor">#define DMLITE_CPP_UTILS_POOLCONTAINER_H</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="preprocessor">#include <boost/thread/mutex.hpp></span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="preprocessor">#include <boost/thread/condition.hpp></span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#include <map></span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor">#include <syslog.h></span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#include <queue></span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#include "../exceptions.h"</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> </div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="keyword">namespace </span>dmlite {</div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"></span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> /// Classes implementing this interface creates the actual element</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> /// since the pool is agnosstic</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"></span> <span class="keyword">template</span> <<span class="keyword">class</span> E></div>
<div class="line"><a name="l00019"></a><span class="lineno"><a class="code" href="classdmlite_1_1_pool_element_factory.html"> 19</a></span>  <span class="keyword">class </span><a class="code" href="classdmlite_1_1_pool_element_factory.html">PoolElementFactory</a> {</div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>  <span class="keyword">public</span>:<span class="comment"></span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> /// Destructor</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"><a class="code" href="classdmlite_1_1_pool_element_factory.html#adb211cbc02e0e9fd99bc76c0a62325fc"> 22</a></span> <span class="comment"></span> <span class="keyword">virtual</span> <a class="code" href="classdmlite_1_1_pool_element_factory.html#adb211cbc02e0e9fd99bc76c0a62325fc" title="Destructor.">~PoolElementFactory</a>() {};</div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment"></span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment"> /// Creates an element</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment"></span> <span class="keyword">virtual</span> E <a class="code" href="classdmlite_1_1_pool_element_factory.html#a6d2ffa370e715da3d3a9a27d23eabd55" title="Creates an element.">create</a>() = 0;</div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"></span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> /// Destroys an element</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment"></span> <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="classdmlite_1_1_pool_element_factory.html#a1d86f9d06acffc96d486199d8b266888" title="Destroys an element.">destroy</a>(E) = 0;</div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment"></span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment"> /// Check it is still valid</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment"></span> <span class="keyword">virtual</span> <span class="keywordtype">bool</span> <a class="code" href="classdmlite_1_1_pool_element_factory.html#a29c1a1a3a8b0cf54057ff043965f99ff" title="Check it is still valid.">isValid</a>(E) = 0;</div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  };</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> </div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment"></span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment"> /// Implements a pool of whichever resource</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment"></span> <span class="keyword">template</span> <<span class="keyword">class</span> E></div>
<div class="line"><a name="l00037"></a><span class="lineno"><a class="code" href="classdmlite_1_1_pool_container.html"> 37</a></span>  <span class="keyword">class </span><a class="code" href="classdmlite_1_1_pool_container.html" title="Implements a pool of whichever resource.">PoolContainer</a> {</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="keyword">public</span>:<span class="comment"></span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment"> /// Constructor</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment"> /// @param factory The factory to use when spawning a new resource.</span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment"> /// @param n The number of resources to keep.</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"><a class="code" href="classdmlite_1_1_pool_container.html#a41cc092cede480a99f1e2a4a2cc9ed96"> 42</a></span> <span class="comment"></span> <a class="code" href="classdmlite_1_1_pool_container.html#a41cc092cede480a99f1e2a4a2cc9ed96">PoolContainer</a>(<a class="code" href="classdmlite_1_1_pool_element_factory.html">PoolElementFactory<E></a>* factory, <span class="keywordtype">int</span> n): <a class="code" href="classdmlite_1_1_pool_container.html#a45286df3eb2a80ef95d8f90afd352fa9">max_</a>(n), <a class="code" href="classdmlite_1_1_pool_container.html#a5f804f8bfbb0c8e84185c89b11cbf106">factory_</a>(factory), <a class="code" href="classdmlite_1_1_pool_container.html#a5914d382d1f8425ca208c8c1ea30fc59">freeSlots_</a>(n)</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  {</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> <span class="comment"></span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="comment"> /// Destructor</span></div>
<div class="line"><a name="l00047"></a><span class="lineno"><a class="code" href="classdmlite_1_1_pool_container.html#aae3784523f2cefdfe83b1a6fd5a8423c"> 47</a></span> <span class="comment"></span> <a class="code" href="classdmlite_1_1_pool_container.html#aae3784523f2cefdfe83b1a6fd5a8423c" title="Destructor.">~PoolContainer</a>()</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  {</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="comment">// Free 'free'</span></div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="keywordflow">while</span> (<a class="code" href="classdmlite_1_1_pool_container.html#a769c438eb5ea61305ace416a476c1a57">free_</a>.size() > 0) {</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  E e = <a class="code" href="classdmlite_1_1_pool_container.html#a769c438eb5ea61305ace416a476c1a57">free_</a>.front();</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <a class="code" href="classdmlite_1_1_pool_container.html#a769c438eb5ea61305ace416a476c1a57">free_</a>.pop();</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <a class="code" href="classdmlite_1_1_pool_container.html#a5f804f8bfbb0c8e84185c89b11cbf106">factory_</a>->destroy(e);</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>  <span class="comment">// Freeing used is dangerous, as we might block if the client code</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="comment">// forgot about something. Assume the memory leak :(</span></div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="keywordflow">if</span> (<a class="code" href="classdmlite_1_1_pool_container.html#abe27728bdce7e22d83a739718ef1d762">used_</a>.size() > 0) {</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  syslog(LOG_USER | LOG_WARNING, <span class="stringliteral">"%ld used elements from a pool not released on destruction!"</span>, (<span class="keywordtype">long</span>)<a class="code" href="classdmlite_1_1_pool_container.html#abe27728bdce7e22d83a739718ef1d762">used_</a>.size());</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>  }</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="comment"></span></div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="comment"> /// Acquires a free resource.</span></div>
<div class="line"><a name="l00063"></a><span class="lineno"><a class="code" href="classdmlite_1_1_pool_container.html#a5b879d39ab8726b562aa605197a04b0e"> 63</a></span> <span class="comment"></span> E <a class="code" href="classdmlite_1_1_pool_container.html#a5b879d39ab8726b562aa605197a04b0e" title="Acquires a free resource.">acquire</a>(<span class="keywordtype">bool</span> block = <span class="keyword">true</span>)</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  {</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  E e;</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="comment">// Wait for one free</span></div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="keywordflow">if</span> (!block && <a class="code" href="classdmlite_1_1_pool_container.html#a5914d382d1f8425ca208c8c1ea30fc59">freeSlots_</a> == 0) {</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keywordflow">throw</span> <a class="code" href="classdmlite_1_1_dm_exception.html" title="Base exception class.">DmException</a>(<a class="code" href="errno_8h.html#a0b23986312e864a2b55103a7d2272c38">DMLITE_SYSERR</a>(EBUSY),</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  std::string(<span class="stringliteral">"No resources available"</span>));</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  }</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>  boost::mutex::scoped_lock lock(<a class="code" href="classdmlite_1_1_pool_container.html#abdfaa3381cd424beac1fda4b55baf352">mutex_</a>);</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="keywordflow">while</span> (<a class="code" href="classdmlite_1_1_pool_container.html#a5914d382d1f8425ca208c8c1ea30fc59">freeSlots_</a> < 1)</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <a class="code" href="classdmlite_1_1_pool_container.html#a929f4312b111360e46d819bbdf938108">available_</a>.wait(lock);</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span> </div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="comment">// If there is any in the queue, give one from there</span></div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="keywordflow">if</span> (<a class="code" href="classdmlite_1_1_pool_container.html#a769c438eb5ea61305ace416a476c1a57">free_</a>.size() > 0) {</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  e = <a class="code" href="classdmlite_1_1_pool_container.html#a769c438eb5ea61305ace416a476c1a57">free_</a>.front();</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <a class="code" href="classdmlite_1_1_pool_container.html#a769c438eb5ea61305ace416a476c1a57">free_</a>.pop();</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="comment">// May have expired!</span></div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keywordflow">if</span> (!<a class="code" href="classdmlite_1_1_pool_container.html#a5f804f8bfbb0c8e84185c89b11cbf106">factory_</a>->isValid(e)) {</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <a class="code" href="classdmlite_1_1_pool_container.html#a5f804f8bfbb0c8e84185c89b11cbf106">factory_</a>->destroy(e);</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  e = <a class="code" href="classdmlite_1_1_pool_container.html#a5f804f8bfbb0c8e84185c89b11cbf106">factory_</a>->create();</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  }</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  }</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="comment">// None created, so create it now</span></div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  e = <a class="code" href="classdmlite_1_1_pool_container.html#a5f804f8bfbb0c8e84185c89b11cbf106">factory_</a>->create();</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  }</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="comment">// Keep track of used</span></div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  <a class="code" href="classdmlite_1_1_pool_container.html#abe27728bdce7e22d83a739718ef1d762">used_</a>.insert(std::pair<E, unsigned>(e, 1));</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  --<a class="code" href="classdmlite_1_1_pool_container.html#a5914d382d1f8425ca208c8c1ea30fc59">freeSlots_</a>;</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span> </div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="keywordflow">return</span> e;</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> <span class="comment"></span></div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span> <span class="comment"> /// Increases the reference count of a resource.</span></div>
<div class="line"><a name="l00098"></a><span class="lineno"><a class="code" href="classdmlite_1_1_pool_container.html#a0832759ff314e819a6e7cdacfe2b56a6"> 98</a></span> <span class="comment"></span> E <a class="code" href="classdmlite_1_1_pool_container.html#a5b879d39ab8726b562aa605197a04b0e" title="Acquires a free resource.">acquire</a>(E e)</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  {</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  boost::mutex::scoped_lock lock(<a class="code" href="classdmlite_1_1_pool_container.html#abdfaa3381cd424beac1fda4b55baf352">mutex_</a>);</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">// Make sure it is there</span></div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="keyword">typename</span> std::map<E, unsigned>::const_iterator i = <a class="code" href="classdmlite_1_1_pool_container.html#abe27728bdce7e22d83a739718ef1d762">used_</a>.find(e);</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="keywordflow">if</span> (i == <a class="code" href="classdmlite_1_1_pool_container.html#abe27728bdce7e22d83a739718ef1d762">used_</a>.end())</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="keywordflow">throw</span> <a class="code" href="classdmlite_1_1_dm_exception.html" title="Base exception class.">DmException</a>(<a class="code" href="errno_8h.html#a0b23986312e864a2b55103a7d2272c38">DMLITE_SYSERR</a>(EINVAL),</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  std::string(<span class="stringliteral">"The resource has not been locked previously!"</span>));</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="comment">// Increase</span></div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <a class="code" href="classdmlite_1_1_pool_container.html#abe27728bdce7e22d83a739718ef1d762">used_</a>[e]++;</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span> </div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="comment">// End</span></div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="keywordflow">return</span> e;</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  }</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span> <span class="comment"></span></div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span> <span class="comment"> /// Releases a resource</span></div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span> <span class="comment"> /// @param e The resource to release.</span></div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span> <span class="comment"> /// @return The reference count after releasing.</span></div>
<div class="line"><a name="l00118"></a><span class="lineno"><a class="code" href="classdmlite_1_1_pool_container.html#a03d7dfcc76bb247165aaa87bd1e5d1ed"> 118</a></span> <span class="comment"></span> <span class="keywordtype">unsigned</span> <a class="code" href="classdmlite_1_1_pool_container.html#a03d7dfcc76bb247165aaa87bd1e5d1ed">release</a>(E e)</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  {</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  boost::mutex::scoped_lock lock(<a class="code" href="classdmlite_1_1_pool_container.html#abdfaa3381cd424beac1fda4b55baf352">mutex_</a>);</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="comment">// Decrease reference count</span></div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <span class="keywordtype">unsigned</span> remaining = --<a class="code" href="classdmlite_1_1_pool_container.html#abe27728bdce7e22d83a739718ef1d762">used_</a>[e];</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <span class="comment">// No one else using it (hopefully...)</span></div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <span class="keywordflow">if</span> (<a class="code" href="classdmlite_1_1_pool_container.html#abe27728bdce7e22d83a739718ef1d762">used_</a>[e] == 0) {</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="comment">// Remove from used</span></div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <a class="code" href="classdmlite_1_1_pool_container.html#abe27728bdce7e22d83a739718ef1d762">used_</a>.erase(e);</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  <span class="comment">// If the free size is less than the maximum, push to free and notify</span></div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  <span class="keywordflow">if</span> ((<span class="keywordtype">long</span>)<a class="code" href="classdmlite_1_1_pool_container.html#a769c438eb5ea61305ace416a476c1a57">free_</a>.size() < <a class="code" href="classdmlite_1_1_pool_container.html#a45286df3eb2a80ef95d8f90afd352fa9">max_</a>) {</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  <a class="code" href="classdmlite_1_1_pool_container.html#a769c438eb5ea61305ace416a476c1a57">free_</a>.push(e);</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  <a class="code" href="classdmlite_1_1_pool_container.html#a929f4312b111360e46d819bbdf938108">available_</a>.notify_one();</div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  }</div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  <span class="comment">// If we are fine, destroy</span></div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  <a class="code" href="classdmlite_1_1_pool_container.html#a5f804f8bfbb0c8e84185c89b11cbf106">factory_</a>->destroy(e);</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  }</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  }</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  ++<a class="code" href="classdmlite_1_1_pool_container.html#a5914d382d1f8425ca208c8c1ea30fc59">freeSlots_</a>;</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span> </div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  <span class="keywordflow">return</span> remaining;</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  }</div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span> <span class="comment"></span></div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span> <span class="comment"> /// Count the number of instances</span></div>
<div class="line"><a name="l00143"></a><span class="lineno"><a class="code" href="classdmlite_1_1_pool_container.html#a3fd248e078069f7dc5acbb7d8ee0b793"> 143</a></span> <span class="comment"></span> <span class="keywordtype">unsigned</span> <a class="code" href="classdmlite_1_1_pool_container.html#a3fd248e078069f7dc5acbb7d8ee0b793" title="Count the number of instances.">refCount</a>(E e)</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  {</div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  <span class="keyword">typename</span> std::map<E, unsigned>::const_iterator i = <a class="code" href="classdmlite_1_1_pool_container.html#abe27728bdce7e22d83a739718ef1d762">used_</a>.find(e);</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  <span class="keywordflow">if</span> (i == <a class="code" href="classdmlite_1_1_pool_container.html#abe27728bdce7e22d83a739718ef1d762">used_</a>.end())</div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  <span class="keywordflow">return</span> <a class="code" href="classdmlite_1_1_pool_container.html#abe27728bdce7e22d83a739718ef1d762">used_</a>[e];</div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  }</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span> <span class="comment"></span></div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span> <span class="comment"> /// Change the pool size</span></div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span> <span class="comment"> /// @param ns The new size.</span></div>
<div class="line"><a name="l00153"></a><span class="lineno"><a class="code" href="classdmlite_1_1_pool_container.html#a139dff1e43519fc13555c26e83bf921e"> 153</a></span> <span class="comment"></span> <span class="keywordtype">void</span> <a class="code" href="classdmlite_1_1_pool_container.html#a139dff1e43519fc13555c26e83bf921e">resize</a>(<span class="keywordtype">int</span> ns)</div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  {</div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  <span class="comment">// The resizing will be done as we get requests</span></div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  boost::mutex::scoped_lock lock(<a class="code" href="classdmlite_1_1_pool_container.html#abdfaa3381cd424beac1fda4b55baf352">mutex_</a>);</div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  <a class="code" href="classdmlite_1_1_pool_container.html#a45286df3eb2a80ef95d8f90afd352fa9">max_</a> = ns;</div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  <a class="code" href="classdmlite_1_1_pool_container.html#a5914d382d1f8425ca208c8c1ea30fc59">freeSlots_</a> = <a class="code" href="classdmlite_1_1_pool_container.html#a45286df3eb2a80ef95d8f90afd352fa9">max_</a> - <a class="code" href="classdmlite_1_1_pool_container.html#abe27728bdce7e22d83a739718ef1d762">used_</a>.size();</div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  <span class="comment">// Increment the semaphore size if needed</span></div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  <span class="comment">// Take into account the used</span></div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  <span class="keywordflow">if</span> (<a class="code" href="classdmlite_1_1_pool_container.html#a5914d382d1f8425ca208c8c1ea30fc59">freeSlots_</a> > 0)</div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  <a class="code" href="classdmlite_1_1_pool_container.html#a929f4312b111360e46d819bbdf938108">available_</a>.notify_all();</div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  }</div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span> </div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  <span class="keyword">private</span>:</div>
<div class="line"><a name="l00166"></a><span class="lineno"><a class="code" href="classdmlite_1_1_pool_container.html#a45286df3eb2a80ef95d8f90afd352fa9"> 166</a></span>  <span class="keywordtype">int</span> <a class="code" href="classdmlite_1_1_pool_container.html#a45286df3eb2a80ef95d8f90afd352fa9">max_</a>;</div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span> </div>
<div class="line"><a name="l00168"></a><span class="lineno"><a class="code" href="classdmlite_1_1_pool_container.html#a5f804f8bfbb0c8e84185c89b11cbf106"> 168</a></span>  <a class="code" href="classdmlite_1_1_pool_element_factory.html">PoolElementFactory<E></a> *<a class="code" href="classdmlite_1_1_pool_container.html#a5f804f8bfbb0c8e84185c89b11cbf106">factory_</a>;</div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span> </div>
<div class="line"><a name="l00170"></a><span class="lineno"><a class="code" href="classdmlite_1_1_pool_container.html#a769c438eb5ea61305ace416a476c1a57"> 170</a></span>  std::queue<E> <a class="code" href="classdmlite_1_1_pool_container.html#a769c438eb5ea61305ace416a476c1a57">free_</a>;</div>
<div class="line"><a name="l00171"></a><span class="lineno"><a class="code" href="classdmlite_1_1_pool_container.html#abe27728bdce7e22d83a739718ef1d762"> 171</a></span>  std::map<E, unsigned> <a class="code" href="classdmlite_1_1_pool_container.html#abe27728bdce7e22d83a739718ef1d762">used_</a>;</div>
<div class="line"><a name="l00172"></a><span class="lineno"><a class="code" href="classdmlite_1_1_pool_container.html#a5914d382d1f8425ca208c8c1ea30fc59"> 172</a></span>  <span class="keywordtype">unsigned</span> <a class="code" href="classdmlite_1_1_pool_container.html#a5914d382d1f8425ca208c8c1ea30fc59">freeSlots_</a>;</div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span> </div>
<div class="line"><a name="l00174"></a><span class="lineno"><a class="code" href="classdmlite_1_1_pool_container.html#abdfaa3381cd424beac1fda4b55baf352"> 174</a></span>  boost::mutex <a class="code" href="classdmlite_1_1_pool_container.html#abdfaa3381cd424beac1fda4b55baf352">mutex_</a>;</div>
<div class="line"><a name="l00175"></a><span class="lineno"><a class="code" href="classdmlite_1_1_pool_container.html#a929f4312b111360e46d819bbdf938108"> 175</a></span>  boost::condition_variable <a class="code" href="classdmlite_1_1_pool_container.html#a929f4312b111360e46d819bbdf938108">available_</a>;</div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  };</div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span> <span class="comment"></span></div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span> <span class="comment"> /// Convenience class that releases a resource on destruction</span></div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span> <span class="comment"></span> <span class="keyword">template</span> <<span class="keyword">class</span> E></div>
<div class="line"><a name="l00180"></a><span class="lineno"><a class="code" href="classdmlite_1_1_pool_grabber.html"> 180</a></span>  <span class="keyword">class </span><a class="code" href="classdmlite_1_1_pool_grabber.html" title="Convenience class that releases a resource on destruction.">PoolGrabber</a> {</div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  <span class="keyword">public</span>:</div>
<div class="line"><a name="l00182"></a><span class="lineno"><a class="code" href="classdmlite_1_1_pool_grabber.html#a125060e12d42d7ea80864e66f3ebd645"> 182</a></span>  <a class="code" href="classdmlite_1_1_pool_grabber.html#a125060e12d42d7ea80864e66f3ebd645">PoolGrabber</a>(<a class="code" href="classdmlite_1_1_pool_container.html" title="Implements a pool of whichever resource.">PoolContainer<E></a>& pool, <span class="keywordtype">bool</span> block = <span class="keyword">true</span>): <a class="code" href="classdmlite_1_1_pool_grabber.html#abb29e651c4df9d1ac3ab7cc2be48c7f8">pool_</a>(pool)</div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  {</div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  <a class="code" href="classdmlite_1_1_pool_grabber.html#a29d3f4ea0787ffb2b70ae5eaaebe8fd6">element_</a> = <a class="code" href="classdmlite_1_1_pool_grabber.html#abb29e651c4df9d1ac3ab7cc2be48c7f8">pool_</a>.acquire(block);</div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  }</div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span> </div>
<div class="line"><a name="l00187"></a><span class="lineno"><a class="code" href="classdmlite_1_1_pool_grabber.html#a74f50b8fb03c0fa8eaa88d6f7f783c59"> 187</a></span>  <a class="code" href="classdmlite_1_1_pool_grabber.html#a74f50b8fb03c0fa8eaa88d6f7f783c59">~PoolGrabber</a>() {</div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  <a class="code" href="classdmlite_1_1_pool_grabber.html#abb29e651c4df9d1ac3ab7cc2be48c7f8">pool_</a>.release(<a class="code" href="classdmlite_1_1_pool_grabber.html#a29d3f4ea0787ffb2b70ae5eaaebe8fd6">element_</a>);</div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  }</div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span> </div>
<div class="line"><a name="l00191"></a><span class="lineno"><a class="code" href="classdmlite_1_1_pool_grabber.html#a4345b497e1386b76ec2cdf1f4d542fd0"> 191</a></span>  <span class="keyword">operator</span> E ()</div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  {</div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  <span class="keywordflow">return</span> <a class="code" href="classdmlite_1_1_pool_grabber.html#a29d3f4ea0787ffb2b70ae5eaaebe8fd6">element_</a>;</div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  }</div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span> </div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  <span class="keyword">private</span>:</div>
<div class="line"><a name="l00197"></a><span class="lineno"><a class="code" href="classdmlite_1_1_pool_grabber.html#abb29e651c4df9d1ac3ab7cc2be48c7f8"> 197</a></span>  <a class="code" href="classdmlite_1_1_pool_container.html" title="Implements a pool of whichever resource.">PoolContainer<E></a>& <a class="code" href="classdmlite_1_1_pool_grabber.html#abb29e651c4df9d1ac3ab7cc2be48c7f8">pool_</a>;</div>
<div class="line"><a name="l00198"></a><span class="lineno"><a class="code" href="classdmlite_1_1_pool_grabber.html#a29d3f4ea0787ffb2b70ae5eaaebe8fd6"> 198</a></span>  E <a class="code" href="classdmlite_1_1_pool_grabber.html#a29d3f4ea0787ffb2b70ae5eaaebe8fd6">element_</a>;</div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  };</div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span> };</div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span> </div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span> <span class="preprocessor">#endif // DMLITE_CPP_UTILS_POOLCONTAINER_H</span></div>
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