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<div class="title">timers_preciseclock.h</div> </div>
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<a href="timers__preciseclock_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>&#160;<span class="comment">/*</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span>&#160;<span class="comment"> * Copyright 2015, Google Inc.</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span>&#160;<span class="comment"> * All rights reserved.</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span>&#160;<span class="comment"> * Redistribution and use in source and binary forms, with or without</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span>&#160;<span class="comment"> * modification, are permitted provided that the following conditions are</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160;<span class="comment"> * met:</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160;<span class="comment"> * * Redistributions of source code must retain the above copyright</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;<span class="comment"> * notice, this list of conditions and the following disclaimer.</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160;<span class="comment"> * * Redistributions in binary form must reproduce the above</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160;<span class="comment"> * copyright notice, this list of conditions and the following disclaimer</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160;<span class="comment"> * in the documentation and/or other materials provided with the</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160;<span class="comment"> * distribution.</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160;<span class="comment"> * * Neither the name of Google Inc. nor the names of its</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160;<span class="comment"> * contributors may be used to endorse or promote products derived from</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160;<span class="comment"> * this software without specific prior written permission.</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160;<span class="comment"> * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160;<span class="comment"> * &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160;<span class="comment"> * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160;<span class="comment"> * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>&#160;<span class="comment"> * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,</span></div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>&#160;<span class="comment"> * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>&#160;<span class="comment"> * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>&#160;<span class="comment"> * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>&#160;</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>&#160;<span class="preprocessor">#ifndef GRPC_CORE_PROFILING_TIMERS_PRECISECLOCK_H</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define GRPC_CORE_PROFILING_TIMERS_PRECISECLOCK_H</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>&#160;<span class="preprocessor">#include &lt;<a class="code" href="sync_8h.html">grpc/support/sync.h</a>&gt;</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160;<span class="preprocessor">#include &lt;<a class="code" href="time_8h.html">grpc/support/time.h</a>&gt;</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>&#160;<span class="preprocessor">#include &lt;stdio.h&gt;</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>&#160;</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>&#160;<span class="preprocessor">#ifdef GRPC_TIMERS_RDTSC</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>&#160;<span class="preprocessor"></span><span class="keyword">typedef</span> <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> <a class="code" href="timers__preciseclock_8h.html#a4f27cae71a2187ed049a3905cae591e2">grpc_precise_clock</a>;</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>&#160;<span class="preprocessor">#if defined(__i386__)</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>&#160;<span class="preprocessor"></span><span class="keyword">static</span> <span class="keywordtype">void</span> grpc_precise_clock_now(<a class="code" href="structgrpc__precise__clock.html">grpc_precise_clock</a> *clk) {</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>&#160; <a class="code" href="structgrpc__precise__clock.html">grpc_precise_clock</a> ret;</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>&#160; __asm__ <span class="keyword">volatile</span>(<span class="stringliteral">&quot;rdtsc&quot;</span> : <span class="stringliteral">&quot;=A&quot;</span>(ret));</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>&#160; *clk = ret;</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160;}</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160;</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>&#160;<span class="comment">// ----------------------------------------------------------------</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>&#160;<span class="preprocessor">#elif defined(__x86_64__) || defined(__amd64__)</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160;<span class="preprocessor"></span><span class="keyword">static</span> <span class="keywordtype">void</span> grpc_precise_clock_now(<a class="code" href="structgrpc__precise__clock.html">grpc_precise_clock</a> *clk) {</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>&#160; <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> <span class="keywordtype">long</span> low, high;</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>&#160; __asm__ <span class="keyword">volatile</span>(<span class="stringliteral">&quot;rdtsc&quot;</span> : <span class="stringliteral">&quot;=a&quot;</span>(low), <span class="stringliteral">&quot;=d&quot;</span>(high));</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>&#160; *clk = (high &lt;&lt; 32) | low;</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>&#160;}</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160;<span class="preprocessor"></span><span class="keyword">static</span> <a class="code" href="sync__posix_8h.html#a28731dc17a4158343f58f453a4d5e37f">gpr_once</a> precise_clock_init = <a class="code" href="sync__posix_8h.html#a8edd7eb4f6860a4f79defbad49c35666">GPR_ONCE_INIT</a>;</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160;<span class="keyword">static</span> <span class="keywordtype">double</span> cycles_per_second = 0.0;</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>&#160;<span class="keyword">static</span> <span class="keywordtype">void</span> grpc_precise_clock_init() {</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>&#160; time_t start = time(NULL);</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>&#160; <a class="code" href="structgrpc__precise__clock.html">grpc_precise_clock</a> start_time;</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>&#160; <a class="code" href="structgrpc__precise__clock.html">grpc_precise_clock</a> end_time;</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>&#160; <span class="keywordflow">while</span> (time(NULL) == start)</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>&#160; ;</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160; grpc_precise_clock_now(&amp;start_time);</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160; <span class="keywordflow">while</span> (time(NULL) == start + 1)</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160; ;</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160; grpc_precise_clock_now(&amp;end_time);</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160; cycles_per_second = end_time - start_time;</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160;}</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>&#160;<span class="keyword">static</span> <span class="keywordtype">double</span> grpc_precise_clock_scaling_factor() {</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160; <a class="code" href="sync_8h.html#ad5c88872723a129b09200b1892d2323f">gpr_once_init</a>(&amp;precise_clock_init, grpc_precise_clock_init);</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>&#160; <span class="keywordflow">return</span> 1e6 / cycles_per_second;</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>&#160;}</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>&#160;<span class="preprocessor">#define GRPC_PRECISE_CLOCK_FORMAT &quot;%f&quot;</span></div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define GRPC_PRECISE_CLOCK_PRINTF_ARGS(clk) \</span></div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160;<span class="preprocessor"> (*(clk)*grpc_precise_clock_scaling_factor())</span></div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>&#160;<span class="preprocessor"></span><span class="preprocessor">#else</span></div>
<div class="line"><a name="l00080"></a><span class="lineno"><a class="line" href="timers__preciseclock_8h.html#a4f27cae71a2187ed049a3905cae591e2"> 80</a></span>&#160;<span class="preprocessor"></span><span class="keyword">typedef</span> <span class="keyword">struct </span><a class="code" href="structgrpc__precise__clock.html">grpc_precise_clock</a> <a class="code" href="structgrpc__precise__clock.html">grpc_precise_clock</a>;</div>
<div class="line"><a name="l00081"></a><span class="lineno"><a class="line" href="structgrpc__precise__clock.html"> 81</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structgrpc__precise__clock.html">grpc_precise_clock</a> {</div>
<div class="line"><a name="l00082"></a><span class="lineno"><a class="line" href="structgrpc__precise__clock.html#a1200f8fec2cdf0a60e482b79b25adb75"> 82</a></span>&#160; <a class="code" href="structgpr__timespec.html">gpr_timespec</a> <a class="code" href="structgrpc__precise__clock.html#a1200f8fec2cdf0a60e482b79b25adb75">clock</a>;</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>&#160;};</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>&#160;<span class="keyword">static</span> <span class="keywordtype">void</span> grpc_precise_clock_now(<a class="code" href="structgrpc__precise__clock.html">grpc_precise_clock</a>* clk) {</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>&#160; clk-&gt;<a class="code" href="structgrpc__precise__clock.html#a1200f8fec2cdf0a60e482b79b25adb75">clock</a> = <a class="code" href="time_8h.html#adf5debcac2bc854e733ca2dec2a1ff19">gpr_now</a>(<a class="code" href="time_8h.html#a2441bd1fbe80e86ff741e0757725b281a685c67eccb0b9e3de6311b1e1330a746">GPR_CLOCK_REALTIME</a>);</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>&#160;}</div>
<div class="line"><a name="l00087"></a><span class="lineno"><a class="line" href="timers__preciseclock_8h.html#a8cbb7d29a1f4fcded6337c7d9c61598d"> 87</a></span>&#160;<span class="preprocessor">#define GRPC_PRECISE_CLOCK_FORMAT &quot;%ld.%09d&quot;</span></div>
<div class="line"><a name="l00088"></a><span class="lineno"><a class="line" href="timers__preciseclock_8h.html#ad8cb0fe2236a54829f5c38cd508305c5"> 88</a></span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define GRPC_PRECISE_CLOCK_PRINTF_ARGS(clk) \</span></div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>&#160;<span class="preprocessor"> (clk)-&gt;clock.tv_sec, (clk)-&gt;clock.tv_nsec</span></div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>&#160;<span class="preprocessor"></span><span class="keyword">static</span> <span class="keywordtype">void</span> grpc_precise_clock_print(<span class="keyword">const</span> <a class="code" href="structgrpc__precise__clock.html">grpc_precise_clock</a>* clk, FILE* fp) {</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>&#160; fprintf(fp, <span class="stringliteral">&quot;%ld.%09d&quot;</span>, clk-&gt;<a class="code" href="structgrpc__precise__clock.html#a1200f8fec2cdf0a60e482b79b25adb75">clock</a>.<a class="code" href="structgpr__timespec.html#af9294cf0049fd33c76ad2da925d9051e">tv_sec</a>, clk-&gt;<a class="code" href="structgrpc__precise__clock.html#a1200f8fec2cdf0a60e482b79b25adb75">clock</a>.<a class="code" href="structgpr__timespec.html#ac326c2133cd003cb206715cf5f500268">tv_nsec</a>);</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>&#160;}</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>&#160;<span class="preprocessor">#endif </span><span class="comment">/* GRPC_TIMERS_RDTSC */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>&#160;<span class="preprocessor">#endif </span><span class="comment">/* GRPC_CORE_PROFILING_TIMERS_PRECISECLOCK_H */</span><span class="preprocessor"></span></div>
<div class="ttc" id="structgpr__timespec_html_af9294cf0049fd33c76ad2da925d9051e"><div class="ttname"><a href="structgpr__timespec.html#af9294cf0049fd33c76ad2da925d9051e">gpr_timespec::tv_sec</a></div><div class="ttdeci">time_t tv_sec</div><div class="ttdef"><b>Definition:</b> time.h:61</div></div>
<div class="ttc" id="sync_8h_html_ad5c88872723a129b09200b1892d2323f"><div class="ttname"><a href="sync_8h.html#ad5c88872723a129b09200b1892d2323f">gpr_once_init</a></div><div class="ttdeci">void gpr_once_init(gpr_once *once, void(*init_routine)(void))</div></div>
<div class="ttc" id="time_8h_html_a2441bd1fbe80e86ff741e0757725b281a685c67eccb0b9e3de6311b1e1330a746"><div class="ttname"><a href="time_8h.html#a2441bd1fbe80e86ff741e0757725b281a685c67eccb0b9e3de6311b1e1330a746">GPR_CLOCK_REALTIME</a></div><div class="ttdef"><b>Definition:</b> time.h:54</div></div>
<div class="ttc" id="time_8h_html"><div class="ttname"><a href="time_8h.html">time.h</a></div></div>
<div class="ttc" id="timers__preciseclock_8h_html_a4f27cae71a2187ed049a3905cae591e2"><div class="ttname"><a href="timers__preciseclock_8h.html#a4f27cae71a2187ed049a3905cae591e2">grpc_precise_clock</a></div><div class="ttdeci">struct grpc_precise_clock grpc_precise_clock</div><div class="ttdef"><b>Definition:</b> timers_preciseclock.h:80</div></div>
<div class="ttc" id="sync__posix_8h_html_a28731dc17a4158343f58f453a4d5e37f"><div class="ttname"><a href="sync__posix_8h.html#a28731dc17a4158343f58f453a4d5e37f">gpr_once</a></div><div class="ttdeci">pthread_once_t gpr_once</div><div class="ttdef"><b>Definition:</b> sync_posix.h:43</div></div>
<div class="ttc" id="structgrpc__precise__clock_html_a1200f8fec2cdf0a60e482b79b25adb75"><div class="ttname"><a href="structgrpc__precise__clock.html#a1200f8fec2cdf0a60e482b79b25adb75">grpc_precise_clock::clock</a></div><div class="ttdeci">gpr_timespec clock</div><div class="ttdef"><b>Definition:</b> timers_preciseclock.h:82</div></div>
<div class="ttc" id="structgpr__timespec_html_ac326c2133cd003cb206715cf5f500268"><div class="ttname"><a href="structgpr__timespec.html#ac326c2133cd003cb206715cf5f500268">gpr_timespec::tv_nsec</a></div><div class="ttdeci">int tv_nsec</div><div class="ttdef"><b>Definition:</b> time.h:62</div></div>
<div class="ttc" id="sync__posix_8h_html_a8edd7eb4f6860a4f79defbad49c35666"><div class="ttname"><a href="sync__posix_8h.html#a8edd7eb4f6860a4f79defbad49c35666">GPR_ONCE_INIT</a></div><div class="ttdeci">#define GPR_ONCE_INIT</div><div class="ttdef"><b>Definition:</b> sync_posix.h:45</div></div>
<div class="ttc" id="sync_8h_html"><div class="ttname"><a href="sync_8h.html">sync.h</a></div></div>
<div class="ttc" id="time_8h_html_adf5debcac2bc854e733ca2dec2a1ff19"><div class="ttname"><a href="time_8h.html#adf5debcac2bc854e733ca2dec2a1ff19">gpr_now</a></div><div class="ttdeci">gpr_timespec gpr_now(gpr_clock_type clock)</div></div>
<div class="ttc" id="structgpr__timespec_html"><div class="ttname"><a href="structgpr__timespec.html">gpr_timespec</a></div><div class="ttdef"><b>Definition:</b> time.h:60</div></div>
<div class="ttc" id="structgrpc__precise__clock_html"><div class="ttname"><a href="structgrpc__precise__clock.html">grpc_precise_clock</a></div><div class="ttdef"><b>Definition:</b> timers_preciseclock.h:81</div></div>
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