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<a href="alarm_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>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>&#160;<span class="comment"> * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>&#160;<span class="comment"> * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>&#160;<span class="comment"> * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY</span></div>
<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_INTERNAL_CORE_IOMGR_ALARM_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_INTERNAL_CORE_IOMGR_ALARM_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 &quot;<a class="code" href="iomgr_8h.html">src/core/iomgr/iomgr.h</a>&quot;</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160;<span class="preprocessor">#include &lt;<a class="code" href="port__platform_8h.html">grpc/support/port_platform.h</a>&gt;</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</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="l00040"></a><span class="lineno"> 40</span>&#160;</div>
<div class="line"><a name="l00041"></a><span class="lineno"><a class="line" href="structgrpc__alarm.html"> 41</a></span>&#160;<span class="keyword">typedef</span> <span class="keyword">struct </span><a class="code" href="structgrpc__alarm.html">grpc_alarm</a> {</div>
<div class="line"><a name="l00042"></a><span class="lineno"><a class="line" href="structgrpc__alarm.html#a8f3f1ae9b65a0cc76971ea7daed1b126"> 42</a></span>&#160; <a class="code" href="structgpr__timespec.html">gpr_timespec</a> <a class="code" href="structgrpc__alarm.html#a8f3f1ae9b65a0cc76971ea7daed1b126">deadline</a>;</div>
<div class="line"><a name="l00043"></a><span class="lineno"><a class="line" href="structgrpc__alarm.html#adef760998486aa79b9637e95a83e061b"> 43</a></span>&#160; <a class="code" href="port__platform_8h.html#aa6abd4df815a5498d1a04b5e691a74a9">gpr_uint32</a> <a class="code" href="structgrpc__alarm.html#adef760998486aa79b9637e95a83e061b">heap_index</a>; <span class="comment">/* INVALID_HEAP_INDEX if not in heap */</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"><a class="line" href="structgrpc__alarm.html#a75136c755eae954d2955f3519ea2919f"> 44</a></span>&#160; <span class="keywordtype">int</span> <a class="code" href="structgrpc__alarm.html#a75136c755eae954d2955f3519ea2919f">triggered</a>;</div>
<div class="line"><a name="l00045"></a><span class="lineno"><a class="line" href="structgrpc__alarm.html#a2f83596c1a3e1337f333dcffebabb7ab"> 45</a></span>&#160; <span class="keyword">struct </span><a class="code" href="structgrpc__alarm.html">grpc_alarm</a> *<a class="code" href="structgrpc__alarm.html#a2f83596c1a3e1337f333dcffebabb7ab">next</a>;</div>
<div class="line"><a name="l00046"></a><span class="lineno"><a class="line" href="structgrpc__alarm.html#a806b141943b6b45f16cc7459ab035b97"> 46</a></span>&#160; <span class="keyword">struct </span><a class="code" href="structgrpc__alarm.html">grpc_alarm</a> *<a class="code" href="structgrpc__alarm.html#a806b141943b6b45f16cc7459ab035b97">prev</a>;</div>
<div class="line"><a name="l00047"></a><span class="lineno"><a class="line" href="structgrpc__alarm.html#a85a6797057eb75a49d63f4301b4b32dd"> 47</a></span>&#160; <a class="code" href="iomgr_8h.html#ad4037ad983dff2d616a6fb90158baad3">grpc_iomgr_cb_func</a> <a class="code" href="structgrpc__alarm.html#a85a6797057eb75a49d63f4301b4b32dd">cb</a>;</div>
<div class="line"><a name="l00048"></a><span class="lineno"><a class="line" href="structgrpc__alarm.html#a0f9db224dc882f41a1d676115ede23c3"> 48</a></span>&#160; <span class="keywordtype">void</span> *<a class="code" href="structgrpc__alarm.html#a0f9db224dc882f41a1d676115ede23c3">cb_arg</a>;</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160;} <a class="code" href="alarm_8h.html#a2a31b5bd57cc9f6b862e9b8ef0ec2bea">grpc_alarm</a>;</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>&#160;</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>&#160;<span class="comment">/* Initialize *alarm. When expired or canceled, alarm_cb will be called with</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160;<span class="comment"> *alarm_cb_arg and status to indicate if it expired (SUCCESS) or was</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>&#160;<span class="comment"> canceled (CANCELLED). alarm_cb is guaranteed to be called exactly once,</span></div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>&#160;<span class="comment"> and application code should check the status to determine how it was</span></div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>&#160;<span class="comment"> invoked. The application callback is also responsible for maintaining</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>&#160;<span class="comment"> information about when to free up any user-level state. */</span></div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160;<span class="keywordtype">void</span> <a class="code" href="alarm_8h.html#a50483486a229b573a29ed9fa30807999">grpc_alarm_init</a>(<a class="code" href="structgrpc__alarm.html">grpc_alarm</a> *alarm, <a class="code" href="structgpr__timespec.html">gpr_timespec</a> <a class="code" href="structgrpc__alarm.html#a8f3f1ae9b65a0cc76971ea7daed1b126">deadline</a>,</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160; <a class="code" href="iomgr_8h.html#ad4037ad983dff2d616a6fb90158baad3">grpc_iomgr_cb_func</a> alarm_cb, <span class="keywordtype">void</span> *alarm_cb_arg,</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160; <a class="code" href="structgpr__timespec.html">gpr_timespec</a> now);</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>&#160;</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>&#160;<span class="comment">/* Note that there is no alarm destroy function. This is because the</span></div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>&#160;<span class="comment"> alarm is a one-time occurrence with a guarantee that the callback will</span></div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>&#160;<span class="comment"> be called exactly once, either at expiration or cancellation. Thus, all</span></div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>&#160;<span class="comment"> the internal alarm event management state is destroyed just before</span></div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>&#160;<span class="comment"> that callback is invoked. If the user has additional state associated with</span></div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160;<span class="comment"> the alarm, the user is responsible for determining when it is safe to</span></div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160;<span class="comment"> destroy that state. */</span></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;<span class="comment">/* Cancel an *alarm.</span></div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160;<span class="comment"> There are three cases:</span></div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160;<span class="comment"> 1. We normally cancel the alarm</span></div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>&#160;<span class="comment"> 2. The alarm has already run</span></div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160;<span class="comment"> 3. We can&#39;t cancel the alarm because it is &quot;in flight&quot;.</span></div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>&#160;<span class="comment"> In all of these cases, the cancellation is still considered successful.</span></div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>&#160;<span class="comment"> They are essentially distinguished in that the alarm_cb will be run</span></div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>&#160;<span class="comment"> exactly once from either the cancellation (with status CANCELLED)</span></div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160;<span class="comment"> or from the activation (with status SUCCESS)</span></div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>&#160;<span class="comment"> Note carefully that the callback function MAY occur in the same callstack</span></div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>&#160;<span class="comment"> as grpc_alarm_cancel. It&#39;s expected that most alarms will be cancelled (their</span></div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>&#160;<span class="comment"> primary use is to implement deadlines), and so this code is optimized such</span></div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>&#160;<span class="comment"> that cancellation costs as little as possible. Making callbacks run inline</span></div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>&#160;<span class="comment"> matches this aim.</span></div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>&#160;<span class="comment"> Requires: cancel() must happen after add() on a given alarm */</span></div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>&#160;<span class="keywordtype">void</span> <a class="code" href="alarm_8h.html#a921e9a2f728d338f42ad586e6d4eaf60">grpc_alarm_cancel</a>(<a class="code" href="structgrpc__alarm.html">grpc_alarm</a> *alarm);</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>&#160;</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>&#160;<span class="preprocessor">#endif </span><span class="comment">/* GRPC_INTERNAL_CORE_IOMGR_ALARM_H */</span><span class="preprocessor"></span></div>
<div class="ttc" id="structgrpc__alarm_html"><div class="ttname"><a href="structgrpc__alarm.html">grpc_alarm</a></div><div class="ttdef"><b>Definition:</b> alarm.h:41</div></div>
<div class="ttc" id="port__platform_8h_html"><div class="ttname"><a href="port__platform_8h.html">port_platform.h</a></div></div>
<div class="ttc" id="alarm_8h_html_a921e9a2f728d338f42ad586e6d4eaf60"><div class="ttname"><a href="alarm_8h.html#a921e9a2f728d338f42ad586e6d4eaf60">grpc_alarm_cancel</a></div><div class="ttdeci">void grpc_alarm_cancel(grpc_alarm *alarm)</div><div class="ttdef"><b>Definition:</b> alarm.c:227</div></div>
<div class="ttc" id="structgrpc__alarm_html_a85a6797057eb75a49d63f4301b4b32dd"><div class="ttname"><a href="structgrpc__alarm.html#a85a6797057eb75a49d63f4301b4b32dd">grpc_alarm::cb</a></div><div class="ttdeci">grpc_iomgr_cb_func cb</div><div class="ttdef"><b>Definition:</b> alarm.h:47</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="structgrpc__alarm_html_a2f83596c1a3e1337f333dcffebabb7ab"><div class="ttname"><a href="structgrpc__alarm.html#a2f83596c1a3e1337f333dcffebabb7ab">grpc_alarm::next</a></div><div class="ttdeci">struct grpc_alarm * next</div><div class="ttdef"><b>Definition:</b> alarm.h:45</div></div>
<div class="ttc" id="port__platform_8h_html_aa6abd4df815a5498d1a04b5e691a74a9"><div class="ttname"><a href="port__platform_8h.html#aa6abd4df815a5498d1a04b5e691a74a9">gpr_uint32</a></div><div class="ttdeci">uint32_t gpr_uint32</div><div class="ttdef"><b>Definition:</b> port_platform.h:309</div></div>
<div class="ttc" id="structgrpc__alarm_html_a0f9db224dc882f41a1d676115ede23c3"><div class="ttname"><a href="structgrpc__alarm.html#a0f9db224dc882f41a1d676115ede23c3">grpc_alarm::cb_arg</a></div><div class="ttdeci">void * cb_arg</div><div class="ttdef"><b>Definition:</b> alarm.h:48</div></div>
<div class="ttc" id="alarm_8h_html_a50483486a229b573a29ed9fa30807999"><div class="ttname"><a href="alarm_8h.html#a50483486a229b573a29ed9fa30807999">grpc_alarm_init</a></div><div class="ttdeci">void grpc_alarm_init(grpc_alarm *alarm, gpr_timespec deadline, grpc_iomgr_cb_func alarm_cb, void *alarm_cb_arg, gpr_timespec now)</div><div class="ttdef"><b>Definition:</b> alarm.c:176</div></div>
<div class="ttc" id="structgrpc__alarm_html_adef760998486aa79b9637e95a83e061b"><div class="ttname"><a href="structgrpc__alarm.html#adef760998486aa79b9637e95a83e061b">grpc_alarm::heap_index</a></div><div class="ttdeci">gpr_uint32 heap_index</div><div class="ttdef"><b>Definition:</b> alarm.h:43</div></div>
<div class="ttc" id="structgrpc__alarm_html_a8f3f1ae9b65a0cc76971ea7daed1b126"><div class="ttname"><a href="structgrpc__alarm.html#a8f3f1ae9b65a0cc76971ea7daed1b126">grpc_alarm::deadline</a></div><div class="ttdeci">gpr_timespec deadline</div><div class="ttdef"><b>Definition:</b> alarm.h:42</div></div>
<div class="ttc" id="iomgr_8h_html_ad4037ad983dff2d616a6fb90158baad3"><div class="ttname"><a href="iomgr_8h.html#ad4037ad983dff2d616a6fb90158baad3">grpc_iomgr_cb_func</a></div><div class="ttdeci">void(* grpc_iomgr_cb_func)(void *arg, int success)</div><div class="ttdoc">gRPC Callback definition. </div><div class="ttdef"><b>Definition:</b> iomgr.h:42</div></div>
<div class="ttc" id="alarm_8h_html_a2a31b5bd57cc9f6b862e9b8ef0ec2bea"><div class="ttname"><a href="alarm_8h.html#a2a31b5bd57cc9f6b862e9b8ef0ec2bea">grpc_alarm</a></div><div class="ttdeci">struct grpc_alarm grpc_alarm</div></div>
<div class="ttc" id="structgrpc__alarm_html_a75136c755eae954d2955f3519ea2919f"><div class="ttname"><a href="structgrpc__alarm.html#a75136c755eae954d2955f3519ea2919f">grpc_alarm::triggered</a></div><div class="ttdeci">int triggered</div><div class="ttdef"><b>Definition:</b> alarm.h:44</div></div>
<div class="ttc" id="structgrpc__alarm_html_a806b141943b6b45f16cc7459ab035b97"><div class="ttname"><a href="structgrpc__alarm.html#a806b141943b6b45f16cc7459ab035b97">grpc_alarm::prev</a></div><div class="ttdeci">struct grpc_alarm * prev</div><div class="ttdef"><b>Definition:</b> alarm.h:46</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="iomgr_8h_html"><div class="ttname"><a href="iomgr_8h.html">iomgr.h</a></div></div>
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