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<a href="circular__buffer_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">/* -*- c++ -*- */</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> * Copyright 2006,2009,2010 Free Software Foundation, Inc.</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> * This file is part of GNU Radio.</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * GNU Radio is free software; you can redistribute it and/or modify</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * it under the terms of the GNU General Public License as published by</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * the Free Software Foundation; either version 3, or (at your option)</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> * any later version.</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * GNU Radio is distributed in the hope that it will be useful,</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * GNU General Public License for more details.</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * You should have received a copy of the GNU General Public License</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> * along with GNU Radio; see the file COPYING. If not, write to</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> * the Free Software Foundation, Inc., 51 Franklin Street,</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> * Boston, MA 02110-1301, USA.</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> </div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor">#ifndef _CIRCULAR_BUFFER_H_</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor"></span><span class="preprocessor">#define _CIRCULAR_BUFFER_H_</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="preprocessor">#include <<a class="code" href="thread_8h.html">gruel/thread.h</a>></span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="preprocessor">#include <iostream></span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="preprocessor">#include <stdexcept></span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> </div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="preprocessor">#ifndef DO_DEBUG</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"><a class="code" href="circular__buffer_8h.html#a6748a559cfa5d68a4eb3ab5e8f644033"> 31</a></span> <span class="preprocessor"></span><span class="preprocessor">#define DO_DEBUG 0</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="preprocessor"></span><span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="preprocessor">#if DO_DEBUG</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="preprocessor"></span><span class="preprocessor">#define DEBUG(X) do{X} while(0);</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="preprocessor"></span><span class="preprocessor">#else</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"><a class="code" href="circular__buffer_8h.html#aef41e8aaf4c60819b30faf396cdf4978"> 37</a></span> <span class="preprocessor"></span><span class="preprocessor">#define DEBUG(X) do{} while(0);</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="preprocessor"></span><span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="keyword">template</span> <<span class="keyword">class</span> T></div>
<div class="line"><a name="l00041"></a><span class="lineno"><a class="code" href="classcircular__buffer.html"> 41</a></span> <span class="keyword">class </span><a class="code" href="classcircular__buffer.html">circular_buffer</a></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> {</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="keyword">private</span>:</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="comment">// the buffer to use</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  T* d_buffer;</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> </div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="comment">// the following are in Items (type T)</span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="keywordtype">size_t</span> d_bufLen_I, d_readNdx_I, d_writeNdx_I;</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="keywordtype">size_t</span> d_n_avail_write_I, d_n_avail_read_I;</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> </div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="comment">// stuff to control access to class internals</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <a class="code" href="namespacegruel.html#a16a913898c1d7f7a8ee459eb7ace413d">gruel::mutex</a>* d_internal;</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <a class="code" href="namespacegruel.html#a7f31867c7b47853d55962183d0a4e999">gruel::condition_variable</a>* d_readBlock;</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <a class="code" href="namespacegruel.html#a7f31867c7b47853d55962183d0a4e999">gruel::condition_variable</a>* d_writeBlock;</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> </div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="comment">// booleans to decide how to control reading, writing, and aborting</span></div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="keywordtype">bool</span> d_doWriteBlock, d_doFullRead, d_doAbort;</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> </div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="keywordtype">void</span> delete_mutex_cond () {</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="keywordflow">if</span> (d_internal) {</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keyword">delete</span> d_internal;</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  d_internal = NULL;</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  }</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="keywordflow">if</span> (d_readBlock) {</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keyword">delete</span> d_readBlock;</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  d_readBlock = NULL;</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>  <span class="keywordflow">if</span> (d_writeBlock) {</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keyword">delete</span> d_writeBlock;</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  d_writeBlock = NULL;</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>  };</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> <span class="keyword">public</span>:</div>
<div class="line"><a name="l00075"></a><span class="lineno"><a class="code" href="classcircular__buffer.html#abe47d88305c64a91fa8fb6fe10b63bb0"> 75</a></span>  <a class="code" href="classcircular__buffer.html#abe47d88305c64a91fa8fb6fe10b63bb0">circular_buffer</a> (<span class="keywordtype">size_t</span> bufLen_I,</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="keywordtype">bool</span> doWriteBlock = <span class="keyword">true</span>, <span class="keywordtype">bool</span> doFullRead = <span class="keyword">false</span>) {</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="keywordflow">if</span> (bufLen_I == 0)</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="keywordflow">throw</span> std::runtime_error (<span class="stringliteral">"circular_buffer(): "</span></div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <span class="stringliteral">"Number of items to buffer must be > 0.\n"</span>);</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  d_bufLen_I = bufLen_I;</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  d_buffer = (T*) <span class="keyword">new</span> T[d_bufLen_I];</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  d_doWriteBlock = doWriteBlock;</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  d_doFullRead = doFullRead;</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  d_internal = NULL;</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  d_readBlock = d_writeBlock = NULL;</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <a class="code" href="classcircular__buffer.html#acc29c0f342fa153d64561b622e3cf3d4">reset</a> ();</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <a class="code" href="circular__buffer_8h.html#aef41e8aaf4c60819b30faf396cdf4978">DEBUG</a> (std::cerr << <span class="stringliteral">"c_b(): buf len (items) = "</span> << d_bufLen_</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  << <span class="stringliteral">", doWriteBlock = "</span> << (d_doWriteBlock ? <span class="stringliteral">"true"</span> : <span class="stringliteral">"false"</span>)</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  << <span class="stringliteral">", doFullRead = "</span> << (d_doFullRead ? <span class="stringliteral">"true"</span> : <span class="stringliteral">"false"</span>)</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  << std::endl);</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"><a class="code" href="classcircular__buffer.html#a6fa47d36777b9522904c0b6165d3183f"> 93</a></span>  <a class="code" href="classcircular__buffer.html#a6fa47d36777b9522904c0b6165d3183f">~circular_buffer</a> () {</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  delete_mutex_cond ();</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="keyword">delete</span> [] d_buffer;</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  };</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span> </div>
<div class="line"><a name="l00098"></a><span class="lineno"><a class="code" href="classcircular__buffer.html#a7b17b62a2c64f5b86759268b4439c00f"> 98</a></span>  <span class="keyword">inline</span> <span class="keywordtype">size_t</span> <a class="code" href="classcircular__buffer.html#a7b17b62a2c64f5b86759268b4439c00f">n_avail_write_items</a> () {</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <a class="code" href="namespacegruel.html#a93eaa071dca707d684d1ba1ee4ca74c5">gruel::scoped_lock</a> l (*d_internal);</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="keywordtype">size_t</span> retVal = d_n_avail_write_I;</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="keywordflow">return</span> (retVal);</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  };</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> </div>
<div class="line"><a name="l00104"></a><span class="lineno"><a class="code" href="classcircular__buffer.html#a8118badb1d022ba8f0497f24cec96b75"> 104</a></span>  <span class="keyword">inline</span> <span class="keywordtype">size_t</span> <a class="code" href="classcircular__buffer.html#a8118badb1d022ba8f0497f24cec96b75">n_avail_read_items</a> () {</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <a class="code" href="namespacegruel.html#a93eaa071dca707d684d1ba1ee4ca74c5">gruel::scoped_lock</a> l (*d_internal);</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="keywordtype">size_t</span> retVal = d_n_avail_read_I;</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <span class="keywordflow">return</span> (retVal);</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  };</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span> </div>
<div class="line"><a name="l00110"></a><span class="lineno"><a class="code" href="classcircular__buffer.html#a9d3199c0412409093c23518771d6acf4"> 110</a></span>  <span class="keyword">inline</span> <span class="keywordtype">size_t</span> <a class="code" href="classcircular__buffer.html#a9d3199c0412409093c23518771d6acf4">buffer_length_items</a> () {<span class="keywordflow">return</span> (d_bufLen_I);};</div>
<div class="line"><a name="l00111"></a><span class="lineno"><a class="code" href="classcircular__buffer.html#aadcd544c25a138781fa6e0e43b49665d"> 111</a></span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span> <a class="code" href="classcircular__buffer.html#aadcd544c25a138781fa6e0e43b49665d">do_write_block</a> () {<span class="keywordflow">return</span> (d_doWriteBlock);};</div>
<div class="line"><a name="l00112"></a><span class="lineno"><a class="code" href="classcircular__buffer.html#aa1af3c61175877bd0fe3baf2130ce65c"> 112</a></span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span> <a class="code" href="classcircular__buffer.html#aa1af3c61175877bd0fe3baf2130ce65c">do_full_read</a> () {<span class="keywordflow">return</span> (d_doFullRead);};</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span> </div>
<div class="line"><a name="l00114"></a><span class="lineno"><a class="code" href="classcircular__buffer.html#acc29c0f342fa153d64561b622e3cf3d4"> 114</a></span>  <span class="keywordtype">void</span> <a class="code" href="classcircular__buffer.html#acc29c0f342fa153d64561b622e3cf3d4">reset</a> () {</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  d_doAbort = <span class="keyword">false</span>;</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  bzero (d_buffer, d_bufLen_I * <span class="keyword">sizeof</span> (T));</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  d_readNdx_I = d_writeNdx_I = d_n_avail_read_I = 0;</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  d_n_avail_write_I = d_bufLen_I;</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  delete_mutex_cond ();</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <span class="comment">// create a mutex to handle contention of shared resources;</span></div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="comment">// any routine needed access to shared resources uses lock()</span></div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <span class="comment">// before doing anything, then unlock() when finished.</span></div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  d_internal = <span class="keyword">new</span> <a class="code" href="namespacegruel.html#a16a913898c1d7f7a8ee459eb7ace413d">gruel::mutex</a> ();</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <span class="comment">// link the internal mutex to the read and write conditions;</span></div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="comment">// when wait() is called, the internal mutex will automatically</span></div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="comment">// be unlock()'ed. Upon return (from a notify_one() to the condition),</span></div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  <span class="comment">// the internal mutex will be lock()'ed.</span></div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  d_readBlock = <span class="keyword">new</span> <a class="code" href="namespacegruel.html#a7f31867c7b47853d55962183d0a4e999">gruel::condition_variable</a> ();</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  d_writeBlock = <span class="keyword">new</span> <a class="code" href="namespacegruel.html#a7f31867c7b47853d55962183d0a4e999">gruel::condition_variable</a> ();</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  };</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="comment">/*</span></div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span> <span class="comment"> * enqueue: add the given buffer of item-length to the queue,</span></div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span> <span class="comment"> * first-in-first-out (FIFO).</span></div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span> <span class="comment"> * inputs:</span></div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span> <span class="comment"> * buf: a pointer to the buffer holding the data</span></div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span> <span class="comment"> * bufLen_I: the buffer length in items (of the instantiated type)</span></div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span> <span class="comment"> * returns:</span></div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span> <span class="comment"> * -1: on overflow (write is not blocking, and data is being</span></div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span> <span class="comment"> * written faster than it is being read)</span></div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span> <span class="comment"> * 0: if nothing to do (0 length buffer)</span></div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span> <span class="comment"> * 1: if success</span></div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span> <span class="comment"> * 2: in the process of aborting, do doing nothing</span></div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span> <span class="comment"> * will throw runtime errors if inputs are improper:</span></div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span> <span class="comment"> * buffer pointer is NULL</span></div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span> <span class="comment"> * buffer length is larger than the instantiated buffer length</span></div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span> </div>
<div class="line"><a name="l00153"></a><span class="lineno"><a class="code" href="classcircular__buffer.html#abcd24de17aa8258835c6dff2c027a6d6"> 153</a></span>  <span class="keywordtype">int</span> <a class="code" href="classcircular__buffer.html#abcd24de17aa8258835c6dff2c027a6d6">enqueue</a> (T* buf, <span class="keywordtype">size_t</span> bufLen_I) {</div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  <a class="code" href="circular__buffer_8h.html#aef41e8aaf4c60819b30faf396cdf4978">DEBUG</a> (std::cerr << <span class="stringliteral">"enqueue: buf = "</span> << (<span class="keywordtype">void</span>*) buf</div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  << <span class="stringliteral">", bufLen = "</span> << bufLen_I</div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  << <span class="stringliteral">", #av_wr = "</span> << d_n_avail_write_I</div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  << <span class="stringliteral">", #av_rd = "</span> << d_n_avail_read_I << std::endl);</div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  <span class="keywordflow">if</span> (bufLen_I > d_bufLen_I) {</div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  std::cerr << <span class="stringliteral">"ERROR: cannot add buffer longer ("</span></div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  << bufLen_I << <span class="stringliteral">") than instantiated length ("</span></div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  << d_bufLen_I << <span class="stringliteral">")."</span> << std::endl;</div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  <span class="keywordflow">throw</span> std::runtime_error (<span class="stringliteral">"circular_buffer::enqueue()"</span>);</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="keywordflow">if</span> (bufLen_I == 0)</div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  <span class="keywordflow">return</span> (0);</div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  <span class="keywordflow">if</span> (!buf)</div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  <span class="keywordflow">throw</span> std::runtime_error (<span class="stringliteral">"circular_buffer::enqueue(): "</span></div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  <span class="stringliteral">"input buffer is NULL.\n"</span>);</div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  <a class="code" href="namespacegruel.html#a93eaa071dca707d684d1ba1ee4ca74c5">gruel::scoped_lock</a> l (*d_internal);</div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  <span class="keywordflow">if</span> (d_doAbort) {</div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  <span class="keywordflow">return</span> (2);</div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  }</div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  <span class="comment">// set the return value to 1: success; change if needed</span></div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  <span class="keywordtype">int</span> <a class="code" href="gc__spu__macs_8h.html#a696b31d3fc8a0a0f24948f98d0e4a4d1">retval</a> = 1;</div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  <span class="keywordflow">if</span> (bufLen_I > d_n_avail_write_I) {</div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  <span class="keywordflow">if</span> (d_doWriteBlock) {</div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  <span class="keywordflow">while</span> (bufLen_I > d_n_avail_write_I) {</div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  <a class="code" href="circular__buffer_8h.html#aef41e8aaf4c60819b30faf396cdf4978">DEBUG</a> (std::cerr << <span class="stringliteral">"enqueue: #len > #a, waiting."</span> << std::endl);</div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  <span class="comment">// wait; will automatically unlock() the internal mutex via</span></div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  <span class="comment">// the scoped lock</span></div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  d_writeBlock->wait (l);</div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  <span class="comment">// and auto re-lock() it here.</span></div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  <span class="keywordflow">if</span> (d_doAbort) {</div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  <a class="code" href="circular__buffer_8h.html#aef41e8aaf4c60819b30faf396cdf4978">DEBUG</a> (std::cerr << <span class="stringliteral">"enqueue: #len > #a, aborting."</span> << std::endl);</div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  <span class="keywordflow">return</span> (2);</div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  }</div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  <a class="code" href="circular__buffer_8h.html#aef41e8aaf4c60819b30faf396cdf4978">DEBUG</a> (std::cerr << <span class="stringliteral">"enqueue: #len > #a, done waiting."</span> << std::endl);</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>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  d_n_avail_read_I = d_bufLen_I - bufLen_I;</div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  d_n_avail_write_I = bufLen_I;</div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  <a class="code" href="circular__buffer_8h.html#aef41e8aaf4c60819b30faf396cdf4978">DEBUG</a> (std::cerr << <span class="stringliteral">"circular_buffer::enqueue: overflow"</span> << std::endl);</div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  retval = -1;</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>  }</div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  <span class="keywordtype">size_t</span> n_now_I = d_bufLen_I - d_writeNdx_I, n_start_I = 0;</div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  <span class="keywordflow">if</span> (n_now_I > bufLen_I)</div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  n_now_I = bufLen_I;</div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (n_now_I < bufLen_I)</div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  n_start_I = bufLen_I - n_now_I;</div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  bcopy (buf, &(d_buffer[d_writeNdx_I]), n_now_I * <span class="keyword">sizeof</span> (T));</div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  <span class="keywordflow">if</span> (n_start_I) {</div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  bcopy (&(buf[n_now_I]), d_buffer, n_start_I * <span class="keyword">sizeof</span> (T));</div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  d_writeNdx_I = n_start_I;</div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  } <span class="keywordflow">else</span></div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  d_writeNdx_I += n_now_I;</div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  d_n_avail_read_I += bufLen_I;</div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  d_n_avail_write_I -= bufLen_I;</div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  d_readBlock->notify_one ();</div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  <span class="keywordflow">return</span> (retval);</div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  };</div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span> </div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span> <span class="comment"> * dequeue: removes from the queue the number of items requested, or</span></div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span> <span class="comment"> * available, into the given buffer on a FIFO basis.</span></div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span> <span class="comment"> * inputs:</span></div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span> <span class="comment"> * buf: a pointer to the buffer into which to copy the data</span></div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span> <span class="comment"> * bufLen_I: pointer to the number of items to remove in items</span></div>
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span> <span class="comment"> * (of the instantiated type)</span></div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span> <span class="comment"> * returns:</span></div>
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span> <span class="comment"> * 0: if nothing to do (0 length buffer)</span></div>
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span> <span class="comment"> * 1: if success</span></div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span> <span class="comment"> * 2: in the process of aborting, do doing nothing</span></div>
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span> <span class="comment"> * will throw runtime errors if inputs are improper:</span></div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span> <span class="comment"> * buffer pointer is NULL</span></div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span> <span class="comment"> * buffer length pointer is NULL</span></div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span> <span class="comment"> * buffer length is larger than the instantiated buffer length</span></div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span> </div>
<div class="line"><a name="l00235"></a><span class="lineno"><a class="code" href="classcircular__buffer.html#a7f86491a41b04da07ed2f5b3dbc748d1"> 235</a></span>  <span class="keywordtype">int</span> <a class="code" href="classcircular__buffer.html#a7f86491a41b04da07ed2f5b3dbc748d1">dequeue</a> (T* buf, <span class="keywordtype">size_t</span>* bufLen_I) {</div>
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  <a class="code" href="circular__buffer_8h.html#aef41e8aaf4c60819b30faf396cdf4978">DEBUG</a> (std::cerr << <span class="stringliteral">"dequeue: buf = "</span> << ((<span class="keywordtype">void</span>*) buf)</div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  << <span class="stringliteral">", *bufLen = "</span> << (*bufLen_I)</div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  << <span class="stringliteral">", #av_wr = "</span> << d_n_avail_write_I</div>
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  << <span class="stringliteral">", #av_rd = "</span> << d_n_avail_read_I << std::endl);</div>
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  <span class="keywordflow">if</span> (!bufLen_I)</div>
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  <span class="keywordflow">throw</span> std::runtime_error (<span class="stringliteral">"circular_buffer::dequeue(): "</span></div>
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  <span class="stringliteral">"input bufLen pointer is NULL.\n"</span>);</div>
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  <span class="keywordflow">if</span> (!buf)</div>
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  <span class="keywordflow">throw</span> std::runtime_error (<span class="stringliteral">"circular_buffer::dequeue(): "</span></div>
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  <span class="stringliteral">"input buffer pointer is NULL.\n"</span>);</div>
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  <span class="keywordtype">size_t</span> l_bufLen_I = *bufLen_I;</div>
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  <span class="keywordflow">if</span> (l_bufLen_I == 0)</div>
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  <span class="keywordflow">return</span> (0);</div>
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  <span class="keywordflow">if</span> (l_bufLen_I > d_bufLen_I) {</div>
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  std::cerr << <span class="stringliteral">"ERROR: cannot remove buffer longer ("</span></div>
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  << l_bufLen_I << <span class="stringliteral">") than instantiated length ("</span></div>
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  << d_bufLen_I << <span class="stringliteral">")."</span> << std::endl;</div>
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span>  <span class="keywordflow">throw</span> std::runtime_error (<span class="stringliteral">"circular_buffer::dequeue()"</span>);</div>
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  }</div>
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span> </div>
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  <a class="code" href="namespacegruel.html#a93eaa071dca707d684d1ba1ee4ca74c5">gruel::scoped_lock</a> l (*d_internal);</div>
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  <span class="keywordflow">if</span> (d_doAbort) {</div>
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  <span class="keywordflow">return</span> (2);</div>
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  }</div>
<div class="line"><a name="l00260"></a><span class="lineno"> 260</span>  <span class="keywordflow">if</span> (d_doFullRead) {</div>
<div class="line"><a name="l00261"></a><span class="lineno"> 261</span>  <span class="keywordflow">while</span> (d_n_avail_read_I < l_bufLen_I) {</div>
<div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  <a class="code" href="circular__buffer_8h.html#aef41e8aaf4c60819b30faf396cdf4978">DEBUG</a> (std::cerr << <span class="stringliteral">"dequeue: #a < #len, waiting."</span> << std::endl);</div>
<div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  <span class="comment">// wait; will automatically unlock() the internal mutex via</span></div>
<div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  <span class="comment">// the scoped lock</span></div>
<div class="line"><a name="l00265"></a><span class="lineno"> 265</span>  d_readBlock->wait (l);</div>
<div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  <span class="comment">// and re-lock() it here.</span></div>
<div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  <span class="keywordflow">if</span> (d_doAbort) {</div>
<div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  <a class="code" href="circular__buffer_8h.html#aef41e8aaf4c60819b30faf396cdf4978">DEBUG</a> (std::cerr << <span class="stringliteral">"dequeue: #a < #len, aborting."</span> << std::endl);</div>
<div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  <span class="keywordflow">return</span> (2);</div>
<div class="line"><a name="l00270"></a><span class="lineno"> 270</span>  }</div>
<div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  <a class="code" href="circular__buffer_8h.html#aef41e8aaf4c60819b30faf396cdf4978">DEBUG</a> (std::cerr << <span class="stringliteral">"dequeue: #a < #len, done waiting."</span> << std::endl);</div>
<div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  }</div>
<div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  <span class="keywordflow">while</span> (d_n_avail_read_I == 0) {</div>
<div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  <a class="code" href="circular__buffer_8h.html#aef41e8aaf4c60819b30faf396cdf4978">DEBUG</a> (std::cerr << <span class="stringliteral">"dequeue: #a == 0, waiting."</span> << std::endl);</div>
<div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  <span class="comment">// wait; will automatically unlock() the internal mutex via</span></div>
<div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  <span class="comment">// the scoped lock</span></div>
<div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  d_readBlock->wait (l);</div>
<div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  <span class="comment">// and re-lock() it here.</span></div>
<div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  <span class="keywordflow">if</span> (d_doAbort) {</div>
<div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  <a class="code" href="circular__buffer_8h.html#aef41e8aaf4c60819b30faf396cdf4978">DEBUG</a> (std::cerr << <span class="stringliteral">"dequeue: #a == 0, aborting."</span> << std::endl);</div>
<div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  <span class="keywordflow">return</span> (2);</div>
<div class="line"><a name="l00283"></a><span class="lineno"> 283</span>  }</div>
<div class="line"><a name="l00284"></a><span class="lineno"> 284</span>  <a class="code" href="circular__buffer_8h.html#aef41e8aaf4c60819b30faf396cdf4978">DEBUG</a> (std::cerr << <span class="stringliteral">"dequeue: #a == 0, done waiting."</span> << std::endl);</div>
<div class="line"><a name="l00285"></a><span class="lineno"> 285</span>  }</div>
<div class="line"><a name="l00286"></a><span class="lineno"> 286</span>  }</div>
<div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  <span class="keywordflow">if</span> (l_bufLen_I > d_n_avail_read_I)</div>
<div class="line"><a name="l00288"></a><span class="lineno"> 288</span>  l_bufLen_I = d_n_avail_read_I;</div>
<div class="line"><a name="l00289"></a><span class="lineno"> 289</span>  <span class="keywordtype">size_t</span> n_now_I = d_bufLen_I - d_readNdx_I, n_start_I = 0;</div>
<div class="line"><a name="l00290"></a><span class="lineno"> 290</span>  <span class="keywordflow">if</span> (n_now_I > l_bufLen_I)</div>
<div class="line"><a name="l00291"></a><span class="lineno"> 291</span>  n_now_I = l_bufLen_I;</div>
<div class="line"><a name="l00292"></a><span class="lineno"> 292</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (n_now_I < l_bufLen_I)</div>
<div class="line"><a name="l00293"></a><span class="lineno"> 293</span>  n_start_I = l_bufLen_I - n_now_I;</div>
<div class="line"><a name="l00294"></a><span class="lineno"> 294</span>  bcopy (&(d_buffer[d_readNdx_I]), buf, n_now_I * <span class="keyword">sizeof</span> (T));</div>
<div class="line"><a name="l00295"></a><span class="lineno"> 295</span>  <span class="keywordflow">if</span> (n_start_I) {</div>
<div class="line"><a name="l00296"></a><span class="lineno"> 296</span>  bcopy (d_buffer, &(buf[n_now_I]), n_start_I * <span class="keyword">sizeof</span> (T));</div>
<div class="line"><a name="l00297"></a><span class="lineno"> 297</span>  d_readNdx_I = n_start_I;</div>
<div class="line"><a name="l00298"></a><span class="lineno"> 298</span>  } <span class="keywordflow">else</span></div>
<div class="line"><a name="l00299"></a><span class="lineno"> 299</span>  d_readNdx_I += n_now_I;</div>
<div class="line"><a name="l00300"></a><span class="lineno"> 300</span>  *bufLen_I = l_bufLen_I;</div>
<div class="line"><a name="l00301"></a><span class="lineno"> 301</span>  d_n_avail_read_I -= l_bufLen_I;</div>
<div class="line"><a name="l00302"></a><span class="lineno"> 302</span>  d_n_avail_write_I += l_bufLen_I;</div>
<div class="line"><a name="l00303"></a><span class="lineno"> 303</span>  d_writeBlock->notify_one ();</div>
<div class="line"><a name="l00304"></a><span class="lineno"> 304</span>  <span class="keywordflow">return</span> (1);</div>
<div class="line"><a name="l00305"></a><span class="lineno"> 305</span>  };</div>
<div class="line"><a name="l00306"></a><span class="lineno"> 306</span> </div>
<div class="line"><a name="l00307"></a><span class="lineno"><a class="code" href="classcircular__buffer.html#a1da17d5f94fe3ca1ffca42a5d307f4f5"> 307</a></span>  <span class="keywordtype">void</span> <a class="code" href="classcircular__buffer.html#a1da17d5f94fe3ca1ffca42a5d307f4f5">abort</a> () {</div>
<div class="line"><a name="l00308"></a><span class="lineno"> 308</span>  <a class="code" href="namespacegruel.html#a93eaa071dca707d684d1ba1ee4ca74c5">gruel::scoped_lock</a> l (*d_internal);</div>
<div class="line"><a name="l00309"></a><span class="lineno"> 309</span>  d_doAbort = <span class="keyword">true</span>;</div>
<div class="line"><a name="l00310"></a><span class="lineno"> 310</span>  d_writeBlock->notify_one ();</div>
<div class="line"><a name="l00311"></a><span class="lineno"> 311</span>  d_readBlock->notify_one ();</div>
<div class="line"><a name="l00312"></a><span class="lineno"> 312</span>  };</div>
<div class="line"><a name="l00313"></a><span class="lineno"> 313</span> };</div>
<div class="line"><a name="l00314"></a><span class="lineno"> 314</span> </div>
<div class="line"><a name="l00315"></a><span class="lineno"> 315</span> <span class="preprocessor">#endif </span><span class="comment">/* _CIRCULAR_BUFFER_H_ */</span><span class="preprocessor"></span></div>
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