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<li class="navelem"><a class="el" href="../../dir_3f8eec2fc361645de4b1ec14c19fffc7.html">packager</a></li><li class="navelem"><a class="el" href="../../dir_d258fb6e36cbaad69b44b6c9489b2bbb.html">file</a></li> </ul>
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<div class="title">io_cache.cc</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// Copyright 2015 Google Inc. All rights reserved.</span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// Use of this source code is governed by a BSD-style</span></div>
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<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">// license that can be found in the LICENSE file or at</span></div>
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<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">// https://developers.google.com/open-source/licenses/bsd</span></div>
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<div class="line"><a name="l00006"></a><span class="lineno"> 6</span>  </div>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="preprocessor">#include "packager/file/io_cache.h"</span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>  </div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#include <string.h></span></div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>  </div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#include <algorithm></span></div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>  </div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor">#include "packager/base/logging.h"</span></div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span>  </div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="keyword">namespace </span><a class="code" href="../../d8/daf/namespaceshaka.html">shaka</a> {</div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>  </div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="keyword">using</span> base::AutoLock;</div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="keyword">using</span> base::AutoUnlock;</div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  </div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> IoCache::IoCache(uint64_t cache_size)</div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  : cache_size_(cache_size),</div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  read_event_(base::WaitableEvent::ResetPolicy::AUTOMATIC,</div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  base::WaitableEvent::InitialState::NOT_SIGNALED),</div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  write_event_(base::WaitableEvent::ResetPolicy::AUTOMATIC,</div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  base::WaitableEvent::InitialState::NOT_SIGNALED),</div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  <span class="comment">// Make the buffer one byte larger than the cache so that when the</span></div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  <span class="comment">// condition r_ptr == w_ptr is unambiguous (buffer empty).</span></div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  circular_buffer_(cache_size + 1),</div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  end_ptr_(&circular_buffer_[0] + cache_size + 1),</div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  r_ptr_(circular_buffer_.data()),</div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  w_ptr_(circular_buffer_.data()),</div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  closed_(false) {}</div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  </div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> IoCache::~IoCache() {</div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  Close();</div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> }</div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  </div>
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<div class="line"><a name="l00038"></a><span class="lineno"><a class="line" href="../../df/d4e/classshaka_1_1IoCache.html#a7cc144c2f848725db08b3ca175475fc2"> 38</a></span> uint64_t IoCache::Read(<span class="keywordtype">void</span>* buffer, uint64_t size) {</div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  DCHECK(buffer);</div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  </div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  AutoLock lock(lock_);</div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <span class="keywordflow">while</span> (!closed_ && (BytesCachedInternal() == 0)) {</div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  AutoUnlock unlock(lock_);</div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  write_event_.Wait();</div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  }</div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  </div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  size = std::min(size, BytesCachedInternal());</div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  uint64_t first_chunk_size(</div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  std::min(size, <span class="keyword">static_cast<</span>uint64_t<span class="keyword">></span>(end_ptr_ - r_ptr_)));</div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  memcpy(buffer, r_ptr_, first_chunk_size);</div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  r_ptr_ += first_chunk_size;</div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  DCHECK_GE(end_ptr_, r_ptr_);</div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keywordflow">if</span> (r_ptr_ == end_ptr_)</div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  r_ptr_ = &circular_buffer_[0];</div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  uint64_t second_chunk_size(size - first_chunk_size);</div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="keywordflow">if</span> (second_chunk_size) {</div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  memcpy(<span class="keyword">static_cast<</span>uint8_t*<span class="keyword">></span>(buffer) + first_chunk_size, r_ptr_,</div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  second_chunk_size);</div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  r_ptr_ += second_chunk_size;</div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  DCHECK_GT(end_ptr_, r_ptr_);</div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  }</div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  read_event_.Signal();</div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keywordflow">return</span> size;</div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> }</div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  </div>
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<div class="line"><a name="l00066"></a><span class="lineno"><a class="line" href="../../df/d4e/classshaka_1_1IoCache.html#a483277a6c68dd58cebb8dafb5c1dcd21"> 66</a></span> uint64_t IoCache::Write(<span class="keyword">const</span> <span class="keywordtype">void</span>* buffer, uint64_t size) {</div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  DCHECK(buffer);</div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  </div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keyword">const</span> uint8_t* r_ptr(<span class="keyword">static_cast<</span><span class="keyword">const </span>uint8_t*<span class="keyword">></span>(buffer));</div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  uint64_t bytes_left(size);</div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="keywordflow">while</span> (bytes_left) {</div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  AutoLock lock(lock_);</div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="keywordflow">while</span> (!closed_ && (BytesFreeInternal() == 0)) {</div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  AutoUnlock unlock(lock_);</div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  VLOG(1) << <span class="stringliteral">"Circular buffer is full, which can happen if data arrives "</span></div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="stringliteral">"faster than being consumed by packager. Ignore if it is not "</span></div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="stringliteral">"live packaging. Otherwise, try increasing --io_cache_size."</span>;</div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  read_event_.Wait();</div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  }</div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="keywordflow">if</span> (closed_)</div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keywordflow">return</span> 0;</div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  </div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  uint64_t write_size(std::min(bytes_left, BytesFreeInternal()));</div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  uint64_t first_chunk_size(</div>
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<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  std::min(write_size, <span class="keyword">static_cast<</span>uint64_t<span class="keyword">></span>(end_ptr_ - w_ptr_)));</div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  memcpy(w_ptr_, r_ptr, first_chunk_size);</div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  w_ptr_ += first_chunk_size;</div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  DCHECK_GE(end_ptr_, w_ptr_);</div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keywordflow">if</span> (w_ptr_ == end_ptr_)</div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  w_ptr_ = &circular_buffer_[0];</div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  r_ptr += first_chunk_size;</div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  uint64_t second_chunk_size(write_size - first_chunk_size);</div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="keywordflow">if</span> (second_chunk_size) {</div>
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<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  memcpy(w_ptr_, r_ptr, second_chunk_size);</div>
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<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  w_ptr_ += second_chunk_size;</div>
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<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  DCHECK_GT(end_ptr_, w_ptr_);</div>
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<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  r_ptr += second_chunk_size;</div>
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<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  }</div>
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<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  bytes_left -= write_size;</div>
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<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  write_event_.Signal();</div>
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<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  }</div>
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<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="keywordflow">return</span> size;</div>
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<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> }</div>
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<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  </div>
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<div class="line"><a name="l00105"></a><span class="lineno"><a class="line" href="../../df/d4e/classshaka_1_1IoCache.html#a10c8e56478fe7bc4c30ea0087eb22804"> 105</a></span> <span class="keywordtype">void</span> IoCache::Clear() {</div>
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<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  AutoLock lock(lock_);</div>
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<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  r_ptr_ = w_ptr_ = circular_buffer_.data();</div>
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<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="comment">// Let any writers know that there is room in the cache.</span></div>
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<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  read_event_.Signal();</div>
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<div class="line"><a name="l00110"></a><span class="lineno"> 110</span> }</div>
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<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  </div>
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<div class="line"><a name="l00112"></a><span class="lineno"><a class="line" href="../../df/d4e/classshaka_1_1IoCache.html#a1c54ca1d747cf0b0b9ab681babff73e6"> 112</a></span> <span class="keywordtype">void</span> IoCache::Close() {</div>
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<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  AutoLock lock(lock_);</div>
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<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  closed_ = <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  read_event_.Signal();</div>
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<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  write_event_.Signal();</div>
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<div class="line"><a name="l00117"></a><span class="lineno"> 117</span> }</div>
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<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  </div>
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<div class="line"><a name="l00119"></a><span class="lineno"><a class="line" href="../../df/d4e/classshaka_1_1IoCache.html#ac2c7cbec6d771de00fe0cfe0b7d0e454"> 119</a></span> <span class="keywordtype">void</span> IoCache::Reopen() {</div>
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<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  AutoLock lock(lock_);</div>
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<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  CHECK(closed_);</div>
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<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  r_ptr_ = w_ptr_ = circular_buffer_.data();</div>
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<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  closed_ = <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  read_event_.Reset();</div>
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<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  write_event_.Reset();</div>
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<div class="line"><a name="l00126"></a><span class="lineno"> 126</span> }</div>
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<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  </div>
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<div class="line"><a name="l00128"></a><span class="lineno"><a class="line" href="../../df/d4e/classshaka_1_1IoCache.html#a8033da711e62112877be7a6ac2186622"> 128</a></span> uint64_t IoCache::BytesCached() {</div>
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<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  AutoLock lock(lock_);</div>
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<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  <span class="keywordflow">return</span> BytesCachedInternal();</div>
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<div class="line"><a name="l00131"></a><span class="lineno"> 131</span> }</div>
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<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  </div>
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<div class="line"><a name="l00133"></a><span class="lineno"><a class="line" href="../../df/d4e/classshaka_1_1IoCache.html#a744559cbb0a3878027ca6fc2a12555c1"> 133</a></span> uint64_t IoCache::BytesFree() {</div>
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<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  AutoLock lock(lock_);</div>
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<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  <span class="keywordflow">return</span> BytesFreeInternal();</div>
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<div class="line"><a name="l00136"></a><span class="lineno"> 136</span> }</div>
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<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  </div>
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<div class="line"><a name="l00138"></a><span class="lineno"> 138</span> uint64_t IoCache::BytesCachedInternal() {</div>
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<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  <span class="keywordflow">return</span> (r_ptr_ <= w_ptr_)</div>
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<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  ? w_ptr_ - r_ptr_</div>
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<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  : (end_ptr_ - r_ptr_) + (w_ptr_ - circular_buffer_.data());</div>
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<div class="line"><a name="l00142"></a><span class="lineno"> 142</span> }</div>
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<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  </div>
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<div class="line"><a name="l00144"></a><span class="lineno"> 144</span> uint64_t IoCache::BytesFreeInternal() {</div>
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<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  <span class="keywordflow">return</span> cache_size_ - BytesCachedInternal();</div>
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<div class="line"><a name="l00146"></a><span class="lineno"> 146</span> }</div>
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<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  </div>
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<div class="line"><a name="l00148"></a><span class="lineno"><a class="line" href="../../df/d4e/classshaka_1_1IoCache.html#abafe56067c5961d56611271b6fc5a760"> 148</a></span> <span class="keywordtype">void</span> IoCache::WaitUntilEmptyOrClosed() {</div>
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<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  AutoLock lock(lock_);</div>
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<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  <span class="keywordflow">while</span> (!closed_ && BytesCachedInternal()) {</div>
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<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  AutoUnlock unlock(lock_);</div>
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<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  read_event_.Wait();</div>
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<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  }</div>
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<div class="line"><a name="l00154"></a><span class="lineno"> 154</span> }</div>
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<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  </div>
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<div class="line"><a name="l00156"></a><span class="lineno"> 156</span> } <span class="comment">// namespace shaka</span></div>
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<div class="ttc" id="anamespaceshaka_html"><div class="ttname"><a href="../../d8/daf/namespaceshaka.html">shaka</a></div><div class="ttdoc">All the methods that are virtual are virtual for mocking.</div><div class="ttdef"><b>Definition:</b> <a href="../../d4/d15/gflags__hex__bytes_8cc_source.html#l00011">gflags_hex_bytes.cc:11</a></div></div>
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