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<li class="navelem"><a class="el" href="dir_d44c64559bbebec7f509842c48db8b23.html">include</a></li><li class="navelem"><a class="el" href="dir_6baf2bb612a2f0daa69af3101ede80a1.html">cutlass</a></li> </ul>
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<a href="semaphore_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">/***************************************************************************************************</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> * Copyright (c) 2017-2019, NVIDIA CORPORATION. All rights reserved.</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> *</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> * Redistribution and use in source and binary forms, with or without modification, are permitted</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> * provided that the following conditions are met:</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * * Redistributions of source code must retain the above copyright notice, this list of</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * conditions and the following disclaimer.</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * * Redistributions in binary form must reproduce the above copyright notice, this list of</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * conditions and the following disclaimer in the documentation and/or other materials</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> * provided with the distribution.</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * * Neither the name of the NVIDIA CORPORATION nor the names of its contributors may be used</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * to endorse or promote products derived from this software without specific prior written</span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> * permission.</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> *</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR</span></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND</span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL NVIDIA CORPORATION BE LIABLE</span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,</span></div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;</span></div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,</span></div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> * STRICT LIABILITY, OR TOR (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE</span></div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment"> * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span></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"> **************************************************************************************************/</span></div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="preprocessor">#pragma once</span></div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> </div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="preprocessor">#include "<a class="code" href="cutlass_8h.html">cutlass/cutlass.h</a>"</span></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> <span class="preprocessor">#include "<a class="code" href="aligned__buffer_8h.html">cutlass/aligned_buffer.h</a>"</span></div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="preprocessor">#include "<a class="code" href="array_8h.html">cutlass/array.h</a>"</span></div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> </div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="preprocessor">#include "<a class="code" href="numeric__types_8h.html">cutlass/numeric_types.h</a>"</span></div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="preprocessor">#include "<a class="code" href="matrix__shape_8h.html">cutlass/matrix_shape.h</a>"</span></div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span> </div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="preprocessor">#include "<a class="code" href="include_2cutlass_2gemm_2gemm_8h.html">cutlass/gemm/gemm.h</a>"</span></div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span> </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">namespace </span><a class="code" href="namespacecutlass.html">cutlass</a> {</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> </div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span> </div><div class="line"><a name="l00048"></a><span class="lineno"><a class="line" href="classcutlass_1_1Semaphore.html"> 48</a></span> <span class="keyword">class </span><a class="code" href="classcutlass_1_1Semaphore.html">Semaphore</a> { </div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="keyword">public</span>:</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> </div><div class="line"><a name="l00051"></a><span class="lineno"><a class="line" href="classcutlass_1_1Semaphore.html#aa68a93d7f787b8c1d1805c070b1e7249"> 51</a></span>  <span class="keywordtype">int</span> *<a class="code" href="classcutlass_1_1Semaphore.html#aa68a93d7f787b8c1d1805c070b1e7249">lock</a>;</div><div class="line"><a name="l00052"></a><span class="lineno"><a class="line" href="classcutlass_1_1Semaphore.html#a21537a5165a13fe4395465b442322104"> 52</a></span>  <span class="keywordtype">bool</span> <a class="code" href="classcutlass_1_1Semaphore.html#a21537a5165a13fe4395465b442322104">wait_thread</a>;</div><div class="line"><a name="l00053"></a><span class="lineno"><a class="line" href="classcutlass_1_1Semaphore.html#aed6e8af94d3811d15d5976859f42619d"> 53</a></span>  <span class="keywordtype">int</span> <a class="code" href="classcutlass_1_1Semaphore.html#aed6e8af94d3811d15d5976859f42619d">state</a>;</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="keyword">public</span>:</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span> </div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <a class="code" href="cutlass_8h.html#a28c2443a142676d3d71effdae1a986b1">CUTLASS_HOST_DEVICE</a></div><div class="line"><a name="l00059"></a><span class="lineno"><a class="line" href="classcutlass_1_1Semaphore.html#a2ce4cd07fe773efa429f726cfbd98070"> 59</a></span>  <a class="code" href="classcutlass_1_1Semaphore.html#a2ce4cd07fe773efa429f726cfbd98070">Semaphore</a>(<span class="keywordtype">int</span> *lock_, <span class="keywordtype">int</span> thread_id): </div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  lock(lock_), </div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  wait_thread(thread_id < 0 || thread_id == 0),</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  state(-1) {</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>  }</div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span> </div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  CUTLASS_DEVICE</div><div class="line"><a name="l00068"></a><span class="lineno"><a class="line" href="classcutlass_1_1Semaphore.html#af7e78f85e6106c1c82c10bee0b76d454"> 68</a></span>  <span class="keywordtype">void</span> <a class="code" href="classcutlass_1_1Semaphore.html#af7e78f85e6106c1c82c10bee0b76d454">fetch</a>() {</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span> </div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="keyword">asm</span> <span class="keyword">volatile</span> (<span class="stringliteral">"ld.global.cg.s32 %0, [%1];\n"</span> : <span class="stringliteral">"=r"</span>(<a class="code" href="classcutlass_1_1Semaphore.html#aed6e8af94d3811d15d5976859f42619d">state</a>) : <span class="stringliteral">"l"</span>(lock));</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="l00074"></a><span class="lineno"> 74</span>  CUTLASS_DEVICE</div><div class="line"><a name="l00075"></a><span class="lineno"><a class="line" href="classcutlass_1_1Semaphore.html#a4ddbd78190c1342d2f964ad2ce18b59e"> 75</a></span>  <span class="keywordtype">int</span> <a class="code" href="classcutlass_1_1Semaphore.html#a4ddbd78190c1342d2f964ad2ce18b59e">get_state</a>()<span class="keyword"> const </span>{</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="keywordflow">return</span> <a class="code" href="classcutlass_1_1Semaphore.html#aed6e8af94d3811d15d5976859f42619d">state</a>;</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  }</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span> </div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  CUTLASS_DEVICE</div><div class="line"><a name="l00081"></a><span class="lineno"><a class="line" href="classcutlass_1_1Semaphore.html#a176a4cbf65e47e9fcba9d93fc264b9c3"> 81</a></span>  <span class="keywordtype">void</span> <a class="code" href="classcutlass_1_1Semaphore.html#a176a4cbf65e47e9fcba9d93fc264b9c3">wait</a>(<span class="keywordtype">int</span> status = 0) {</div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span> </div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="keywordflow">if</span> (wait_thread) {</div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="keywordflow">while</span> (state != status) {</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>  <a class="code" href="classcutlass_1_1Semaphore.html#af7e78f85e6106c1c82c10bee0b76d454">fetch</a>();</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span> </div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  __syncwarp(0x01);</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>  };</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  }</div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span> </div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  __syncthreads();</div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  }</div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span> </div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  CUTLASS_DEVICE</div><div class="line"><a name="l00098"></a><span class="lineno"><a class="line" href="classcutlass_1_1Semaphore.html#a04e893ba5a9ddb20e1b3c6475771c0e9"> 98</a></span>  <span class="keywordtype">void</span> <a class="code" href="classcutlass_1_1Semaphore.html#a04e893ba5a9ddb20e1b3c6475771c0e9">release</a>(<span class="keywordtype">int</span> status = 0) {</div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  __syncthreads();</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span> </div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="keywordflow">if</span> (wait_thread) {</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>  <span class="keyword">asm</span> <span class="keyword">volatile</span> (<span class="stringliteral">"st.global.cg.s32 [%0], %1;\n"</span> : : <span class="stringliteral">"l"</span>(<a class="code" href="classcutlass_1_1Semaphore.html#aa68a93d7f787b8c1d1805c070b1e7249">lock</a>), <span class="stringliteral">"r"</span>(status));</div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  }</div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  }</div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span> };</div><div class="line"><a name="l00107"></a><span class="lineno"> 107</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"> 110</span> } <span class="comment">// namespace cutlass</span></div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span> </div><div class="ttc" id="namespacecutlass_html"><div class="ttname"><a href="namespacecutlass.html">cutlass</a></div><div class="ttdef"><b>Definition:</b> aligned_buffer.h:35</div></div>
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<div class="ttc" id="include_2cutlass_2gemm_2gemm_8h_html"><div class="ttname"><a href="include_2cutlass_2gemm_2gemm_8h.html">gemm.h</a></div><div class="ttdoc">Defines common types used for all GEMM-like operators. </div></div>
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<div class="ttc" id="classcutlass_1_1Semaphore_html_a2ce4cd07fe773efa429f726cfbd98070"><div class="ttname"><a href="classcutlass_1_1Semaphore.html#a2ce4cd07fe773efa429f726cfbd98070">cutlass::Semaphore::Semaphore</a></div><div class="ttdeci">CUTLASS_HOST_DEVICE Semaphore(int *lock_, int thread_id)</div><div class="ttdoc">Implements a semaphore to wait for a flag to reach a given value. </div><div class="ttdef"><b>Definition:</b> semaphore.h:59</div></div>
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<div class="ttc" id="classcutlass_1_1Semaphore_html_af7e78f85e6106c1c82c10bee0b76d454"><div class="ttname"><a href="classcutlass_1_1Semaphore.html#af7e78f85e6106c1c82c10bee0b76d454">cutlass::Semaphore::fetch</a></div><div class="ttdeci">CUTLASS_DEVICE void fetch()</div><div class="ttdoc">Permit fetching the synchronization mechanism early. </div><div class="ttdef"><b>Definition:</b> semaphore.h:68</div></div>
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<div class="ttc" id="array_8h_html"><div class="ttname"><a href="array_8h.html">array.h</a></div><div class="ttdoc">Statically sized array of elements that accommodates all CUTLASS-supported numeric types and is safe ...</div></div>
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<div class="ttc" id="matrix__shape_8h_html"><div class="ttname"><a href="matrix__shape_8h.html">matrix_shape.h</a></div><div class="ttdoc">Defines a Shape template for matrix tiles. </div></div>
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<div class="ttc" id="classcutlass_1_1Semaphore_html_a4ddbd78190c1342d2f964ad2ce18b59e"><div class="ttname"><a href="classcutlass_1_1Semaphore.html#a4ddbd78190c1342d2f964ad2ce18b59e">cutlass::Semaphore::get_state</a></div><div class="ttdeci">CUTLASS_DEVICE int get_state() const </div><div class="ttdoc">Gets the internal state. </div><div class="ttdef"><b>Definition:</b> semaphore.h:75</div></div>
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<div class="ttc" id="classcutlass_1_1Semaphore_html_a21537a5165a13fe4395465b442322104"><div class="ttname"><a href="classcutlass_1_1Semaphore.html#a21537a5165a13fe4395465b442322104">cutlass::Semaphore::wait_thread</a></div><div class="ttdeci">bool wait_thread</div><div class="ttdef"><b>Definition:</b> semaphore.h:52</div></div>
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<div class="ttc" id="aligned__buffer_8h_html"><div class="ttname"><a href="aligned__buffer_8h.html">aligned_buffer.h</a></div><div class="ttdoc">AlignedBuffer is a container for trivially copyable elements suitable for use in unions and shared me...</div></div>
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<div class="ttc" id="cutlass_8h_html_a28c2443a142676d3d71effdae1a986b1"><div class="ttname"><a href="cutlass_8h.html#a28c2443a142676d3d71effdae1a986b1">CUTLASS_HOST_DEVICE</a></div><div class="ttdeci">#define CUTLASS_HOST_DEVICE</div><div class="ttdef"><b>Definition:</b> cutlass.h:89</div></div>
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<div class="ttc" id="numeric__types_8h_html"><div class="ttname"><a href="numeric__types_8h.html">numeric_types.h</a></div><div class="ttdoc">Top-level include for all CUTLASS numeric types. </div></div>
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<div class="ttc" id="classcutlass_1_1Semaphore_html"><div class="ttname"><a href="classcutlass_1_1Semaphore.html">cutlass::Semaphore</a></div><div class="ttdoc">CTA-wide semaphore for inter-CTA synchronization. </div><div class="ttdef"><b>Definition:</b> semaphore.h:48</div></div>
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<div class="ttc" id="classcutlass_1_1Semaphore_html_a04e893ba5a9ddb20e1b3c6475771c0e9"><div class="ttname"><a href="classcutlass_1_1Semaphore.html#a04e893ba5a9ddb20e1b3c6475771c0e9">cutlass::Semaphore::release</a></div><div class="ttdeci">CUTLASS_DEVICE void release(int status=0)</div><div class="ttdoc">Updates the lock with the given result. </div><div class="ttdef"><b>Definition:</b> semaphore.h:98</div></div>
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<div class="ttc" id="classcutlass_1_1Semaphore_html_a176a4cbf65e47e9fcba9d93fc264b9c3"><div class="ttname"><a href="classcutlass_1_1Semaphore.html#a176a4cbf65e47e9fcba9d93fc264b9c3">cutlass::Semaphore::wait</a></div><div class="ttdeci">CUTLASS_DEVICE void wait(int status=0)</div><div class="ttdoc">Waits until the semaphore is equal to the given value. </div><div class="ttdef"><b>Definition:</b> semaphore.h:81</div></div>
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<div class="ttc" id="cutlass_8h_html"><div class="ttname"><a href="cutlass_8h.html">cutlass.h</a></div><div class="ttdoc">Basic include for CUTLASS. </div></div>
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<div class="ttc" id="classcutlass_1_1Semaphore_html_aed6e8af94d3811d15d5976859f42619d"><div class="ttname"><a href="classcutlass_1_1Semaphore.html#aed6e8af94d3811d15d5976859f42619d">cutlass::Semaphore::state</a></div><div class="ttdeci">int state</div><div class="ttdef"><b>Definition:</b> semaphore.h:53</div></div>
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<div class="ttc" id="classcutlass_1_1Semaphore_html_aa68a93d7f787b8c1d1805c070b1e7249"><div class="ttname"><a href="classcutlass_1_1Semaphore.html#aa68a93d7f787b8c1d1805c070b1e7249">cutlass::Semaphore::lock</a></div><div class="ttdeci">int * lock</div><div class="ttdef"><b>Definition:</b> semaphore.h:51</div></div>
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