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<a href="sync_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_SUPPORT_SYNC_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_SUPPORT_SYNC_H</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>&#160;<span class="preprocessor"></span><span class="comment">/* Synchronization primitives for GPR.</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160;<span class="comment"> The type gpr_mu provides a non-reentrant mutex (lock).</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>&#160;<span class="comment"> The type gpr_cv provides a condition variable.</span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>&#160;<span class="comment"> The type gpr_once provides for one-time initialization.</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>&#160;<span class="comment"> The type gpr_event provides one-time-setting, reading, and</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>&#160;<span class="comment"> waiting of a void*, with memory barriers.</span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>&#160;<span class="comment"> The type gpr_refcount provides an object reference counter,</span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160;<span class="comment"> with memory barriers suitable to control</span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160;<span class="comment"> object lifetimes.</span></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="comment"> The type gpr_stats_counter provides an atomic statistics counter. It</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160;<span class="comment"> provides no memory barriers.</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>&#160;</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>&#160;<span class="comment">/* Platform-specific type declarations of gpr_mu and gpr_cv. */</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</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="l00057"></a><span class="lineno"> 57</span>&#160;<span class="preprocessor">#include &lt;<a class="code" href="sync__generic_8h.html">grpc/support/sync_generic.h</a>&gt;</span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160;</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160;<span class="preprocessor">#if defined(GPR_POSIX_SYNC)</span></div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>&#160;<span class="preprocessor"></span><span class="preprocessor">#include &lt;<a class="code" href="sync__posix_8h.html">grpc/support/sync_posix.h</a>&gt;</span></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>&#160;<span class="preprocessor">#elif defined(GPR_WIN32)</span></div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>&#160;<span class="preprocessor"></span><span class="preprocessor">#include &lt;<a class="code" href="sync__win32_8h.html">grpc/support/sync_win32.h</a>&gt;</span></div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>&#160;<span class="preprocessor">#elif !defined(GPR_CUSTOM_SYNC)</span></div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>&#160;<span class="preprocessor"></span><span class="preprocessor">#error Unable to determine platform for sync</span></div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>&#160;<span class="preprocessor"></span><span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160;<span class="preprocessor">#include &lt;<a class="code" href="time_8h.html">grpc/support/time.h</a>&gt;</span> <span class="comment">/* for gpr_timespec */</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160;<span class="preprocessor">#include &lt;<a class="code" href="cancellable__platform_8h.html">grpc/support/cancellable_platform.h</a>&gt;</span></div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160;</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160;<span class="preprocessor">#ifdef __cplusplus</span></div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160;<span class="preprocessor"></span><span class="keyword">extern</span> <span class="stringliteral">&quot;C&quot;</span> {</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>&#160;<span class="comment">/* --- Mutex interface ---</span></div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>&#160;<span class="comment"> At most one thread may hold an exclusive lock on a mutex at any given time.</span></div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>&#160;<span class="comment"> Actions taken by a thread that holds a mutex exclusively happen after</span></div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160;<span class="comment"> actions taken by all previous holders of the mutex. Variables of type</span></div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>&#160;<span class="comment"> gpr_mu are uninitialized when first declared. */</span></div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>&#160;</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>&#160;<span class="comment">/* Initialize *mu. Requires: *mu uninitialized. */</span></div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>&#160;<span class="keywordtype">void</span> <a class="code" href="sync_8h.html#a16694f755266c254390b041a0f069094">gpr_mu_init</a>(<a class="code" href="structgpr__mu.html">gpr_mu</a> *mu);</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="comment">/* Cause *mu no longer to be initialized, freeing any memory in use. Requires:</span></div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>&#160;<span class="comment"> *mu initialized; no other concurrent operation on *mu. */</span></div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>&#160;<span class="keywordtype">void</span> <a class="code" href="sync_8h.html#a52ae2524c7dade8cecb9f01ff4792c9e">gpr_mu_destroy</a>(<a class="code" href="structgpr__mu.html">gpr_mu</a> *mu);</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>&#160;</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>&#160;<span class="comment">/* Wait until no thread has a lock on *mu, cause the calling thread to own an</span></div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>&#160;<span class="comment"> exclusive lock on *mu, then return. May block indefinitely or crash if the</span></div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>&#160;<span class="comment"> calling thread has a lock on *mu. Requires: *mu initialized. */</span></div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>&#160;<span class="keywordtype">void</span> <a class="code" href="sync_8h.html#a44b385455d169e6c84659adb222c1d42">gpr_mu_lock</a>(<a class="code" href="structgpr__mu.html">gpr_mu</a> *mu);</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="comment">/* Release an exclusive lock on *mu held by the calling thread. Requires: *mu</span></div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>&#160;<span class="comment"> initialized; the calling thread holds an exclusive lock on *mu. */</span></div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>&#160;<span class="keywordtype">void</span> <a class="code" href="sync_8h.html#a91370fd0eb76bc1323c80815ad6e9cff">gpr_mu_unlock</a>(<a class="code" href="structgpr__mu.html">gpr_mu</a> *mu);</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>&#160;</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>&#160;<span class="comment">/* Without blocking, attempt to acquire an exclusive lock on *mu for the</span></div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>&#160;<span class="comment"> calling thread, then return non-zero iff success. Fail, if any thread holds</span></div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>&#160;<span class="comment"> the lock; succeeds with high probability if no thread holds the lock.</span></div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>&#160;<span class="comment"> Requires: *mu initialized. */</span></div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>&#160;<span class="keywordtype">int</span> <a class="code" href="sync_8h.html#a65a42bb7ca9072b0e7b581d715a8e777">gpr_mu_trylock</a>(<a class="code" href="structgpr__mu.html">gpr_mu</a> *mu);</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>&#160;</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>&#160;<span class="comment">/* --- Condition variable interface ---</span></div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>&#160;<span class="comment"> A while-loop should be used with gpr_cv_wait() when waiting for conditions</span></div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>&#160;<span class="comment"> to become true. See the example below. Variables of type gpr_cv are</span></div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>&#160;<span class="comment"> uninitialized when first declared. */</span></div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>&#160;</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>&#160;<span class="comment">/* Initialize *cv. Requires: *cv uninitialized. */</span></div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>&#160;<span class="keywordtype">void</span> <a class="code" href="sync_8h.html#ad24aac3d86113f0fcffc6c4595da9cb2">gpr_cv_init</a>(<a class="code" href="sync__posix_8h.html#a1ad613e07180c0459cda9f3f6d881885">gpr_cv</a> *cv);</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>&#160;</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>&#160;<span class="comment">/* Cause *cv no longer to be initialized, freeing any memory in use. Requires:</span></div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>&#160;<span class="comment"> *cv initialized; no other concurrent operation on *cv.*/</span></div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>&#160;<span class="keywordtype">void</span> <a class="code" href="sync_8h.html#a652900a910676d5cae9ccba052adb6b0">gpr_cv_destroy</a>(<a class="code" href="sync__posix_8h.html#a1ad613e07180c0459cda9f3f6d881885">gpr_cv</a> *cv);</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>&#160;</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>&#160;<span class="comment">/* Atomically release *mu and wait on *cv. When the calling thread is woken</span></div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>&#160;<span class="comment"> from *cv or the deadline abs_deadline is exceeded, execute gpr_mu_lock(mu)</span></div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>&#160;<span class="comment"> and return whether the deadline was exceeded. Use</span></div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>&#160;<span class="comment"> abs_deadline==gpr_inf_future for no deadline. May return even when not</span></div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>&#160;<span class="comment"> woken explicitly. Requires: *mu and *cv initialized; the calling thread</span></div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>&#160;<span class="comment"> holds an exclusive lock on *mu. */</span></div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>&#160;<span class="keywordtype">int</span> <a class="code" href="sync_8h.html#ad5d8d01509b75addc44e5a43783a826e">gpr_cv_wait</a>(<a class="code" href="sync__posix_8h.html#a1ad613e07180c0459cda9f3f6d881885">gpr_cv</a> *cv, <a class="code" href="structgpr__mu.html">gpr_mu</a> *mu, <a class="code" href="structgpr__timespec.html">gpr_timespec</a> abs_deadline);</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>&#160;</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>&#160;<span class="comment">/* Behave like gpr_cv_wait(cv, mu, abs_deadline), except behave as though</span></div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>&#160;<span class="comment"> the deadline has expired if *c is cancelled. */</span></div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>&#160;<span class="keywordtype">int</span> <a class="code" href="sync_8h.html#a5f1df649a9885ff2354dd4ce611017d9">gpr_cv_cancellable_wait</a>(<a class="code" href="sync__posix_8h.html#a1ad613e07180c0459cda9f3f6d881885">gpr_cv</a> *cv, <a class="code" href="structgpr__mu.html">gpr_mu</a> *mu, <a class="code" href="structgpr__timespec.html">gpr_timespec</a> abs_deadline,</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>&#160; <a class="code" href="structgpr__cancellable.html">gpr_cancellable</a> *c);</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>&#160;</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>&#160;<span class="comment">/* If any threads are waiting on *cv, wake at least one.</span></div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>&#160;<span class="comment"> Clients may treat this as an optimization of gpr_cv_broadcast()</span></div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>&#160;<span class="comment"> for use in the case where waking more than one waiter is not useful.</span></div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>&#160;<span class="comment"> Requires: *cv initialized. */</span></div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>&#160;<span class="keywordtype">void</span> <a class="code" href="sync_8h.html#aba119d0b92b0bd50e6efa9e2abe07a5f">gpr_cv_signal</a>(<a class="code" href="sync__posix_8h.html#a1ad613e07180c0459cda9f3f6d881885">gpr_cv</a> *cv);</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>&#160;</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>&#160;<span class="comment">/* Wake all threads waiting on *cv. Requires: *cv initialized. */</span></div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>&#160;<span class="keywordtype">void</span> <a class="code" href="sync_8h.html#ad5a4b4a5844668d188db89dda6ad205b">gpr_cv_broadcast</a>(<a class="code" href="sync__posix_8h.html#a1ad613e07180c0459cda9f3f6d881885">gpr_cv</a> *cv);</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>&#160;</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>&#160;<span class="comment">/* --- Cancellation ---</span></div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>&#160;<span class="comment"> A gpr_cancellable can be used with gpr_cv_cancellable_wait()</span></div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>&#160;<span class="comment"> or gpr_event_cancellable_wait() cancel pending waits. */</span></div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>&#160;</div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>&#160;<span class="comment">/* Initialize *c. */</span></div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>&#160;<span class="keywordtype">void</span> <a class="code" href="sync_8h.html#aec0b0e9b9f084550cdec300da1f31add">gpr_cancellable_init</a>(<a class="code" href="structgpr__cancellable.html">gpr_cancellable</a> *c);</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>&#160;</div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>&#160;<span class="comment">/* Cause *c no longer to be initialized, freeing any memory in use. Requires:</span></div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>&#160;<span class="comment"> *c initialized; no other concurrent operation on *c. */</span></div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>&#160;<span class="keywordtype">void</span> <a class="code" href="sync_8h.html#aa82b7172b992bd33bd6fd4b4dc89e338">gpr_cancellable_destroy</a>(<a class="code" href="structgpr__cancellable.html">gpr_cancellable</a> *c);</div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>&#160;</div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>&#160;<span class="comment">/* Return non-zero iff *c has been cancelled. Requires *c initialized.</span></div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>&#160;<span class="comment"> This call is faster than acquiring a mutex on most platforms. */</span></div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>&#160;<span class="keywordtype">int</span> <a class="code" href="sync_8h.html#a1e53047443e5eb1f9895be0c90bc790b">gpr_cancellable_is_cancelled</a>(<a class="code" href="structgpr__cancellable.html">gpr_cancellable</a> *c);</div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>&#160;</div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>&#160;<span class="comment">/* Cancel *c. If *c was not previously cancelled, cause</span></div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>&#160;<span class="comment"> gpr_cancellable_init() to return non-zero, and outstanding and future</span></div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>&#160;<span class="comment"> calls to gpr_cv_cancellable_wait() and gpr_event_cancellable_wait() to</span></div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>&#160;<span class="comment"> return immediately indicating a timeout has occurred; otherwise do nothing.</span></div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>&#160;<span class="comment"> Requires *c initialized.*/</span></div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>&#160;<span class="keywordtype">void</span> <a class="code" href="sync_8h.html#a895fb73161d2dd1fa19be10d5395001c">gpr_cancellable_cancel</a>(<a class="code" href="structgpr__cancellable.html">gpr_cancellable</a> *c);</div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>&#160;</div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>&#160;<span class="comment">/* --- One-time initialization ---</span></div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>&#160;<span class="comment"> gpr_once must be declared with static storage class, and initialized with</span></div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>&#160;<span class="comment"> GPR_ONCE_INIT. e.g.,</span></div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>&#160;<span class="comment"> static gpr_once once_var = GPR_ONCE_INIT; */</span></div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>&#160;</div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>&#160;<span class="comment">/* Ensure that (*init_routine)() has been called exactly once (for the</span></div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>&#160;<span class="comment"> specified gpr_once instance) and then return.</span></div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>&#160;<span class="comment"> If multiple threads call gpr_once() on the same gpr_once instance, one of</span></div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>&#160;<span class="comment"> them will call (*init_routine)(), and the others will block until that call</span></div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>&#160;<span class="comment"> finishes.*/</span></div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>&#160;<span class="keywordtype">void</span> <a class="code" href="sync_8h.html#ad5c88872723a129b09200b1892d2323f">gpr_once_init</a>(<a class="code" href="sync__posix_8h.html#a28731dc17a4158343f58f453a4d5e37f">gpr_once</a> *once, <span class="keywordtype">void</span> (*init_routine)(<span class="keywordtype">void</span>));</div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>&#160;</div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>&#160;<span class="comment">/* --- One-time event notification ---</span></div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>&#160;<span class="comment"> These operations act on a gpr_event, which should be initialized with</span></div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>&#160;<span class="comment"> gpr_ev_init(), or with GPR_EVENT_INIT if static, e.g.,</span></div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>&#160;<span class="comment"> static gpr_event event_var = GPR_EVENT_INIT;</span></div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>&#160;<span class="comment"> It requires no destruction. */</span></div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>&#160;</div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>&#160;<span class="comment">/* Initialize *ev. */</span></div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>&#160;<span class="keywordtype">void</span> <a class="code" href="sync_8h.html#a93f37cd27964fda51acd4cd8e6737922">gpr_event_init</a>(<a class="code" href="structgpr__event.html">gpr_event</a> *ev);</div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>&#160;</div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>&#160;<span class="comment">/* Set *ev so that gpr_event_get() and gpr_event_wait() will return value.</span></div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>&#160;<span class="comment"> Requires: *ev initialized; value != NULL; no prior or concurrent calls to</span></div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>&#160;<span class="comment"> gpr_event_set(ev, ...) since initialization. */</span></div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>&#160;<span class="keywordtype">void</span> <a class="code" href="sync_8h.html#a1b1d014640e00512f6789dacc4ff88bd">gpr_event_set</a>(<a class="code" href="structgpr__event.html">gpr_event</a> *ev, <span class="keywordtype">void</span> *value);</div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>&#160;</div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>&#160;<span class="comment">/* Return the value set by gpr_event_set(ev, ...), or NULL if no such call has</span></div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>&#160;<span class="comment"> completed. If the result is non-NULL, all operations that occurred prior to</span></div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>&#160;<span class="comment"> the gpr_event_set(ev, ...) set will be visible after this call returns.</span></div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>&#160;<span class="comment"> Requires: *ev initialized. This operation is faster than acquiring a mutex</span></div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>&#160;<span class="comment"> on most platforms. */</span></div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>&#160;<span class="keywordtype">void</span> *<a class="code" href="sync_8h.html#ac0a2305d9e6575cc5a3d92bc3f12c161">gpr_event_get</a>(<a class="code" href="structgpr__event.html">gpr_event</a> *ev);</div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>&#160;</div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>&#160;<span class="comment">/* Wait until *ev is set by gpr_event_set(ev, ...), or abs_deadline is</span></div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span>&#160;<span class="comment"> exceeded, then return gpr_event_get(ev). Requires: *ev initialized. Use</span></div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>&#160;<span class="comment"> abs_deadline==gpr_inf_future for no deadline. When the event has been</span></div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>&#160;<span class="comment"> signalled before the call, this operation is faster than acquiring a mutex</span></div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>&#160;<span class="comment"> on most platforms. */</span></div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>&#160;<span class="keywordtype">void</span> *<a class="code" href="sync_8h.html#a01d442a76ff77f64d9f898b22ea33db7">gpr_event_wait</a>(<a class="code" href="structgpr__event.html">gpr_event</a> *ev, <a class="code" href="structgpr__timespec.html">gpr_timespec</a> abs_deadline);</div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>&#160;</div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>&#160;<span class="comment">/* Behave like gpr_event_wait(ev, abs_deadline), except behave as though</span></div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>&#160;<span class="comment"> the deadline has expired if *c is cancelled. */</span></div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>&#160;<span class="keywordtype">void</span> *<a class="code" href="sync_8h.html#ae048c7e762b723821e35a07fd0d85e22">gpr_event_cancellable_wait</a>(<a class="code" href="structgpr__event.html">gpr_event</a> *ev, <a class="code" href="structgpr__timespec.html">gpr_timespec</a> abs_deadline,</div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>&#160; <a class="code" href="structgpr__cancellable.html">gpr_cancellable</a> *c);</div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>&#160;</div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>&#160;<span class="comment">/* --- Reference counting ---</span></div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>&#160;<span class="comment"> These calls act on the type gpr_refcount. It requires no destruction. */</span></div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>&#160;</div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>&#160;<span class="comment">/* Initialize *r to value n. */</span></div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>&#160;<span class="keywordtype">void</span> <a class="code" href="sync_8h.html#a235584f36572b5410b042ee63cb0740b">gpr_ref_init</a>(<a class="code" href="structgpr__refcount.html">gpr_refcount</a> *r, <span class="keywordtype">int</span> n);</div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>&#160;</div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>&#160;<span class="comment">/* Increment the reference count *r. Requires *r initialized. */</span></div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span>&#160;<span class="keywordtype">void</span> <a class="code" href="sync_8h.html#ac0e52c6bfc7a04ba8a269f3227104571">gpr_ref</a>(<a class="code" href="structgpr__refcount.html">gpr_refcount</a> *r);</div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span>&#160;</div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span>&#160;<span class="comment">/* Increment the reference count *r by n. Requires *r initialized, n &gt; 0. */</span></div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span>&#160;<span class="keywordtype">void</span> <a class="code" href="sync_8h.html#a516e26b66b1aa53fba8f5f52b249cb25">gpr_refn</a>(<a class="code" href="structgpr__refcount.html">gpr_refcount</a> *r, <span class="keywordtype">int</span> n);</div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>&#160;</div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span>&#160;<span class="comment">/* Decrement the reference count *r and return non-zero iff it has reached</span></div>
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span>&#160;<span class="comment"> zero. . Requires *r initialized. */</span></div>
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span>&#160;<span class="keywordtype">int</span> <a class="code" href="sync_8h.html#a76b570c831b14070c37e708dde91b795">gpr_unref</a>(<a class="code" href="structgpr__refcount.html">gpr_refcount</a> *r);</div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span>&#160;</div>
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span>&#160;<span class="comment">/* --- Stats counters ---</span></div>
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span>&#160;<span class="comment"> These calls act on the integral type gpr_stats_counter. It requires no</span></div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span>&#160;<span class="comment"> destruction. Static instances may be initialized with</span></div>
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span>&#160;<span class="comment"> gpr_stats_counter c = GPR_STATS_INIT;</span></div>
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span>&#160;<span class="comment"> Beware: These operations do not imply memory barriers. Do not use them to</span></div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span>&#160;<span class="comment"> synchronize other events. */</span></div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>&#160;</div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>&#160;<span class="comment">/* Initialize *c to the value n. */</span></div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span>&#160;<span class="keywordtype">void</span> <a class="code" href="sync_8h.html#a76b8e5de6e1baa4fd66c014417dc0a30">gpr_stats_init</a>(<a class="code" href="structgpr__stats__counter.html">gpr_stats_counter</a> *c, <a class="code" href="port__platform_8h.html#a72d9d0d00bd576cfc8eab61aaea76db2">gpr_intptr</a> n);</div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span>&#160;</div>
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span>&#160;<span class="comment">/* *c += inc. Requires: *c initialized. */</span></div>
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span>&#160;<span class="keywordtype">void</span> <a class="code" href="sync_8h.html#a8e51ec3b46c7c03602e2279a802daa1c">gpr_stats_inc</a>(<a class="code" href="structgpr__stats__counter.html">gpr_stats_counter</a> *c, <a class="code" href="port__platform_8h.html#a72d9d0d00bd576cfc8eab61aaea76db2">gpr_intptr</a> inc);</div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>&#160;</div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span>&#160;<span class="comment">/* Return *c. Requires: *c initialized. */</span></div>
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span>&#160;<a class="code" href="port__platform_8h.html#a72d9d0d00bd576cfc8eab61aaea76db2">gpr_intptr</a> <a class="code" href="sync_8h.html#abb2c58da7d0b785887266b3b1890764d">gpr_stats_read</a>(<span class="keyword">const</span> <a class="code" href="structgpr__stats__counter.html">gpr_stats_counter</a> *c);</div>
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span>&#160;</div>
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span>&#160;<span class="comment">/* ==================Example use of interface===================</span></div>
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span>&#160;<span class="comment"> A producer-consumer queue of up to N integers,</span></div>
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span>&#160;<span class="comment"> illustrating the use of the calls in this interface. */</span></div>
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span>&#160;<span class="preprocessor">#if 0</span></div>
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span>&#160;<span class="preprocessor">#define N 4</span></div>
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span>&#160; <span class="keyword">typedef</span> <span class="keyword">struct </span>queue {</div>
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span>&#160; <a class="code" href="sync__posix_8h.html#a1ad613e07180c0459cda9f3f6d881885">gpr_cv</a> non_empty; <span class="comment">/* Signalled when length becomes non-zero. */</span></div>
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span>&#160; <a class="code" href="sync__posix_8h.html#a1ad613e07180c0459cda9f3f6d881885">gpr_cv</a> non_full; <span class="comment">/* Signalled when length becomes non-N. */</span></div>
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span>&#160; <a class="code" href="structgpr__mu.html">gpr_mu</a> mu; <span class="comment">/* Protects all fields below.</span></div>
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span>&#160;<span class="comment"> (That is, except during initialization or</span></div>
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span>&#160;<span class="comment"> destruction, the fields below should be accessed</span></div>
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span>&#160;<span class="comment"> only by a thread that holds mu.) */</span></div>
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span>&#160; <span class="keywordtype">int</span> head; <span class="comment">/* Index of head of queue 0..N-1. */</span></div>
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span>&#160; <span class="keywordtype">int</span> length; <span class="comment">/* Number of valid elements in queue 0..N. */</span></div>
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span>&#160; <span class="keywordtype">int</span> elem[N]; <span class="comment">/* elem[head .. head+length-1] are queue elements. */</span></div>
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span>&#160; } queue;</div>
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span>&#160;</div>
<div class="line"><a name="l00260"></a><span class="lineno"> 260</span>&#160; <span class="comment">/* Initialize *q. */</span></div>
<div class="line"><a name="l00261"></a><span class="lineno"> 261</span>&#160; <span class="keywordtype">void</span> queue_init(queue *q) {</div>
<div class="line"><a name="l00262"></a><span class="lineno"> 262</span>&#160; <a class="code" href="sync_8h.html#a16694f755266c254390b041a0f069094">gpr_mu_init</a>(&amp;q-&gt;mu);</div>
<div class="line"><a name="l00263"></a><span class="lineno"> 263</span>&#160; <a class="code" href="sync_8h.html#ad24aac3d86113f0fcffc6c4595da9cb2">gpr_cv_init</a>(&amp;q-&gt;non_empty);</div>
<div class="line"><a name="l00264"></a><span class="lineno"> 264</span>&#160; <a class="code" href="sync_8h.html#ad24aac3d86113f0fcffc6c4595da9cb2">gpr_cv_init</a>(&amp;q-&gt;non_full);</div>
<div class="line"><a name="l00265"></a><span class="lineno"> 265</span>&#160; q-&gt;head = 0;</div>
<div class="line"><a name="l00266"></a><span class="lineno"> 266</span>&#160; q-&gt;length = 0;</div>
<div class="line"><a name="l00267"></a><span class="lineno"> 267</span>&#160; }</div>
<div class="line"><a name="l00268"></a><span class="lineno"> 268</span>&#160;</div>
<div class="line"><a name="l00269"></a><span class="lineno"> 269</span>&#160; <span class="comment">/* Free storage associated with *q. */</span></div>
<div class="line"><a name="l00270"></a><span class="lineno"> 270</span>&#160; <span class="keywordtype">void</span> queue_destroy(queue *q) {</div>
<div class="line"><a name="l00271"></a><span class="lineno"> 271</span>&#160; <a class="code" href="sync_8h.html#a52ae2524c7dade8cecb9f01ff4792c9e">gpr_mu_destroy</a>(&amp;q-&gt;mu);</div>
<div class="line"><a name="l00272"></a><span class="lineno"> 272</span>&#160; <a class="code" href="sync_8h.html#a652900a910676d5cae9ccba052adb6b0">gpr_cv_destroy</a>(&amp;q-&gt;non_empty);</div>
<div class="line"><a name="l00273"></a><span class="lineno"> 273</span>&#160; <a class="code" href="sync_8h.html#a652900a910676d5cae9ccba052adb6b0">gpr_cv_destroy</a>(&amp;q-&gt;non_full);</div>
<div class="line"><a name="l00274"></a><span class="lineno"> 274</span>&#160; }</div>
<div class="line"><a name="l00275"></a><span class="lineno"> 275</span>&#160;</div>
<div class="line"><a name="l00276"></a><span class="lineno"> 276</span>&#160; <span class="comment">/* Wait until there is room in *q, then append x to *q. */</span></div>
<div class="line"><a name="l00277"></a><span class="lineno"> 277</span>&#160; <span class="keywordtype">void</span> queue_append(queue *q, <span class="keywordtype">int</span> x) {</div>
<div class="line"><a name="l00278"></a><span class="lineno"> 278</span>&#160; <a class="code" href="sync_8h.html#a44b385455d169e6c84659adb222c1d42">gpr_mu_lock</a>(&amp;q-&gt;mu);</div>
<div class="line"><a name="l00279"></a><span class="lineno"> 279</span>&#160; <span class="comment">/* To wait for a predicate without a deadline, loop on the negation of the</span></div>
<div class="line"><a name="l00280"></a><span class="lineno"> 280</span>&#160;<span class="comment"> predicate, and use gpr_cv_wait(..., gpr_inf_future) inside the loop</span></div>
<div class="line"><a name="l00281"></a><span class="lineno"> 281</span>&#160;<span class="comment"> to release the lock, wait, and reacquire on each iteration. Code that</span></div>
<div class="line"><a name="l00282"></a><span class="lineno"> 282</span>&#160;<span class="comment"> makes the condition true should use gpr_cv_broadcast() on the</span></div>
<div class="line"><a name="l00283"></a><span class="lineno"> 283</span>&#160;<span class="comment"> corresponding condition variable. The predicate must be on state</span></div>
<div class="line"><a name="l00284"></a><span class="lineno"> 284</span>&#160;<span class="comment"> protected by the lock. */</span></div>
<div class="line"><a name="l00285"></a><span class="lineno"> 285</span>&#160; <span class="keywordflow">while</span> (q-&gt;length == N) {</div>
<div class="line"><a name="l00286"></a><span class="lineno"> 286</span>&#160; <a class="code" href="sync_8h.html#ad5d8d01509b75addc44e5a43783a826e">gpr_cv_wait</a>(&amp;q-&gt;non_full, &amp;q-&gt;mu, <a class="code" href="time_8h.html#a9324a2b33d5d7686fb14714c59ff026d">gpr_inf_future</a>);</div>
<div class="line"><a name="l00287"></a><span class="lineno"> 287</span>&#160; }</div>
<div class="line"><a name="l00288"></a><span class="lineno"> 288</span>&#160; <span class="keywordflow">if</span> (q-&gt;length == 0) { <span class="comment">/* Wake threads blocked in queue_remove(). */</span></div>
<div class="line"><a name="l00289"></a><span class="lineno"> 289</span>&#160; <span class="comment">/* It&#39;s normal to use gpr_cv_broadcast() or gpr_signal() while</span></div>
<div class="line"><a name="l00290"></a><span class="lineno"> 290</span>&#160;<span class="comment"> holding the lock. */</span></div>
<div class="line"><a name="l00291"></a><span class="lineno"> 291</span>&#160; <a class="code" href="sync_8h.html#ad5a4b4a5844668d188db89dda6ad205b">gpr_cv_broadcast</a>(&amp;q-&gt;non_empty);</div>
<div class="line"><a name="l00292"></a><span class="lineno"> 292</span>&#160; }</div>
<div class="line"><a name="l00293"></a><span class="lineno"> 293</span>&#160; q-&gt;elem[(q-&gt;head + q-&gt;length) % N] = x;</div>
<div class="line"><a name="l00294"></a><span class="lineno"> 294</span>&#160; q-&gt;length++;</div>
<div class="line"><a name="l00295"></a><span class="lineno"> 295</span>&#160; <a class="code" href="sync_8h.html#a91370fd0eb76bc1323c80815ad6e9cff">gpr_mu_unlock</a>(&amp;q-&gt;mu);</div>
<div class="line"><a name="l00296"></a><span class="lineno"> 296</span>&#160; }</div>
<div class="line"><a name="l00297"></a><span class="lineno"> 297</span>&#160;</div>
<div class="line"><a name="l00298"></a><span class="lineno"> 298</span>&#160; <span class="comment">/* If it can be done without blocking, append x to *q and return non-zero.</span></div>
<div class="line"><a name="l00299"></a><span class="lineno"> 299</span>&#160;<span class="comment"> Otherwise return 0. */</span></div>
<div class="line"><a name="l00300"></a><span class="lineno"> 300</span>&#160; <span class="keywordtype">int</span> queue_try_append(queue *q, <span class="keywordtype">int</span> x) {</div>
<div class="line"><a name="l00301"></a><span class="lineno"> 301</span>&#160; <span class="keywordtype">int</span> result = 0;</div>
<div class="line"><a name="l00302"></a><span class="lineno"> 302</span>&#160; <span class="keywordflow">if</span> (<a class="code" href="sync_8h.html#a65a42bb7ca9072b0e7b581d715a8e777">gpr_mu_trylock</a>(&amp;q-&gt;mu)) {</div>
<div class="line"><a name="l00303"></a><span class="lineno"> 303</span>&#160; <span class="keywordflow">if</span> (q-&gt;length != N) {</div>
<div class="line"><a name="l00304"></a><span class="lineno"> 304</span>&#160; <span class="keywordflow">if</span> (q-&gt;length == 0) { <span class="comment">/* Wake threads blocked in queue_remove(). */</span></div>
<div class="line"><a name="l00305"></a><span class="lineno"> 305</span>&#160; <a class="code" href="sync_8h.html#ad5a4b4a5844668d188db89dda6ad205b">gpr_cv_broadcast</a>(&amp;q-&gt;non_empty);</div>
<div class="line"><a name="l00306"></a><span class="lineno"> 306</span>&#160; }</div>
<div class="line"><a name="l00307"></a><span class="lineno"> 307</span>&#160; q-&gt;elem[(q-&gt;head + q-&gt;length) % N] = x;</div>
<div class="line"><a name="l00308"></a><span class="lineno"> 308</span>&#160; q-&gt;length++;</div>
<div class="line"><a name="l00309"></a><span class="lineno"> 309</span>&#160; result = 1;</div>
<div class="line"><a name="l00310"></a><span class="lineno"> 310</span>&#160; }</div>
<div class="line"><a name="l00311"></a><span class="lineno"> 311</span>&#160; <a class="code" href="sync_8h.html#a91370fd0eb76bc1323c80815ad6e9cff">gpr_mu_unlock</a>(&amp;q-&gt;mu);</div>
<div class="line"><a name="l00312"></a><span class="lineno"> 312</span>&#160; }</div>
<div class="line"><a name="l00313"></a><span class="lineno"> 313</span>&#160; <span class="keywordflow">return</span> result;</div>
<div class="line"><a name="l00314"></a><span class="lineno"> 314</span>&#160; }</div>
<div class="line"><a name="l00315"></a><span class="lineno"> 315</span>&#160;</div>
<div class="line"><a name="l00316"></a><span class="lineno"> 316</span>&#160; <span class="comment">/* Wait until the *q is non-empty or deadline abs_deadline passes. If the</span></div>
<div class="line"><a name="l00317"></a><span class="lineno"> 317</span>&#160;<span class="comment"> queue is non-empty, remove its head entry, place it in *head, and return</span></div>
<div class="line"><a name="l00318"></a><span class="lineno"> 318</span>&#160;<span class="comment"> non-zero. Otherwise return 0. */</span></div>
<div class="line"><a name="l00319"></a><span class="lineno"> 319</span>&#160; <span class="keywordtype">int</span> queue_remove(queue *q, <span class="keywordtype">int</span> *head, <a class="code" href="structgpr__timespec.html">gpr_timespec</a> abs_deadline) {</div>
<div class="line"><a name="l00320"></a><span class="lineno"> 320</span>&#160; <span class="keywordtype">int</span> result = 0;</div>
<div class="line"><a name="l00321"></a><span class="lineno"> 321</span>&#160; <a class="code" href="sync_8h.html#a44b385455d169e6c84659adb222c1d42">gpr_mu_lock</a>(&amp;q-&gt;mu);</div>
<div class="line"><a name="l00322"></a><span class="lineno"> 322</span>&#160; <span class="comment">/* To wait for a predicate with a deadline, loop on the negation of the</span></div>
<div class="line"><a name="l00323"></a><span class="lineno"> 323</span>&#160;<span class="comment"> predicate or until gpr_cv_wait() returns true. Code that makes</span></div>
<div class="line"><a name="l00324"></a><span class="lineno"> 324</span>&#160;<span class="comment"> the condition true should use gpr_cv_broadcast() on the corresponding</span></div>
<div class="line"><a name="l00325"></a><span class="lineno"> 325</span>&#160;<span class="comment"> condition variable. The predicate must be on state protected by the</span></div>
<div class="line"><a name="l00326"></a><span class="lineno"> 326</span>&#160;<span class="comment"> lock. */</span></div>
<div class="line"><a name="l00327"></a><span class="lineno"> 327</span>&#160; <span class="keywordflow">while</span> (q-&gt;length == 0 &amp;&amp;</div>
<div class="line"><a name="l00328"></a><span class="lineno"> 328</span>&#160; !<a class="code" href="sync_8h.html#ad5d8d01509b75addc44e5a43783a826e">gpr_cv_wait</a>(&amp;q-&gt;non_empty, &amp;q-&gt;mu, abs_deadline)) {</div>
<div class="line"><a name="l00329"></a><span class="lineno"> 329</span>&#160; }</div>
<div class="line"><a name="l00330"></a><span class="lineno"> 330</span>&#160; <span class="keywordflow">if</span> (q-&gt;length != 0) { <span class="comment">/* Queue is non-empty. */</span></div>
<div class="line"><a name="l00331"></a><span class="lineno"> 331</span>&#160; result = 1;</div>
<div class="line"><a name="l00332"></a><span class="lineno"> 332</span>&#160; <span class="keywordflow">if</span> (q-&gt;length == N) { <span class="comment">/* Wake threads blocked in queue_append(). */</span></div>
<div class="line"><a name="l00333"></a><span class="lineno"> 333</span>&#160; <a class="code" href="sync_8h.html#ad5a4b4a5844668d188db89dda6ad205b">gpr_cv_broadcast</a>(&amp;q-&gt;non_full);</div>
<div class="line"><a name="l00334"></a><span class="lineno"> 334</span>&#160; }</div>
<div class="line"><a name="l00335"></a><span class="lineno"> 335</span>&#160; *head = q-&gt;elem[q-&gt;head];</div>
<div class="line"><a name="l00336"></a><span class="lineno"> 336</span>&#160; q-&gt;head = (q-&gt;head + 1) % N;</div>
<div class="line"><a name="l00337"></a><span class="lineno"> 337</span>&#160; q-&gt;length--;</div>
<div class="line"><a name="l00338"></a><span class="lineno"> 338</span>&#160; } <span class="comment">/* else deadline exceeded */</span></div>
<div class="line"><a name="l00339"></a><span class="lineno"> 339</span>&#160; <a class="code" href="sync_8h.html#a91370fd0eb76bc1323c80815ad6e9cff">gpr_mu_unlock</a>(&amp;q-&gt;mu);</div>
<div class="line"><a name="l00340"></a><span class="lineno"> 340</span>&#160; <span class="keywordflow">return</span> result;</div>
<div class="line"><a name="l00341"></a><span class="lineno"> 341</span>&#160; }</div>
<div class="line"><a name="l00342"></a><span class="lineno"> 342</span>&#160;<span class="preprocessor">#endif </span><span class="comment">/* 0 */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00343"></a><span class="lineno"> 343</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00344"></a><span class="lineno"> 344</span>&#160;<span class="preprocessor">#ifdef __cplusplus</span></div>
<div class="line"><a name="l00345"></a><span class="lineno"> 345</span>&#160;<span class="preprocessor"></span>}</div>
<div class="line"><a name="l00346"></a><span class="lineno"> 346</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00347"></a><span class="lineno"> 347</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00348"></a><span class="lineno"> 348</span>&#160;<span class="preprocessor">#endif </span><span class="comment">/* GRPC_SUPPORT_SYNC_H */</span><span class="preprocessor"></span></div>
<div class="ttc" id="sync__posix_8h_html"><div class="ttname"><a href="sync__posix_8h.html">sync_posix.h</a></div></div>
<div class="ttc" id="sync_8h_html_a44b385455d169e6c84659adb222c1d42"><div class="ttname"><a href="sync_8h.html#a44b385455d169e6c84659adb222c1d42">gpr_mu_lock</a></div><div class="ttdeci">void gpr_mu_lock(gpr_mu *mu)</div></div>
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<div class="ttc" id="port__platform_8h_html"><div class="ttname"><a href="port__platform_8h.html">port_platform.h</a></div></div>
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<div class="ttc" id="sync_8h_html_a516e26b66b1aa53fba8f5f52b249cb25"><div class="ttname"><a href="sync_8h.html#a516e26b66b1aa53fba8f5f52b249cb25">gpr_refn</a></div><div class="ttdeci">void gpr_refn(gpr_refcount *r, int n)</div></div>
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<div class="ttc" id="time_8h_html"><div class="ttname"><a href="time_8h.html">time.h</a></div></div>
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<div class="ttc" id="sync__win32_8h_html"><div class="ttname"><a href="sync__win32_8h.html">sync_win32.h</a></div></div>
<div class="ttc" id="sync_8h_html_a65a42bb7ca9072b0e7b581d715a8e777"><div class="ttname"><a href="sync_8h.html#a65a42bb7ca9072b0e7b581d715a8e777">gpr_mu_trylock</a></div><div class="ttdeci">int gpr_mu_trylock(gpr_mu *mu)</div></div>
<div class="ttc" id="sync_8h_html_ad5d8d01509b75addc44e5a43783a826e"><div class="ttname"><a href="sync_8h.html#ad5d8d01509b75addc44e5a43783a826e">gpr_cv_wait</a></div><div class="ttdeci">int gpr_cv_wait(gpr_cv *cv, gpr_mu *mu, gpr_timespec abs_deadline)</div></div>
<div class="ttc" id="sync_8h_html_a01d442a76ff77f64d9f898b22ea33db7"><div class="ttname"><a href="sync_8h.html#a01d442a76ff77f64d9f898b22ea33db7">gpr_event_wait</a></div><div class="ttdeci">void * gpr_event_wait(gpr_event *ev, gpr_timespec abs_deadline)</div></div>
<div class="ttc" id="time_8h_html_a9324a2b33d5d7686fb14714c59ff026d"><div class="ttname"><a href="time_8h.html#a9324a2b33d5d7686fb14714c59ff026d">gpr_inf_future</a></div><div class="ttdeci">gpr_timespec gpr_inf_future(gpr_clock_type type)</div></div>
<div class="ttc" id="sync_8h_html_a1b1d014640e00512f6789dacc4ff88bd"><div class="ttname"><a href="sync_8h.html#a1b1d014640e00512f6789dacc4ff88bd">gpr_event_set</a></div><div class="ttdeci">void gpr_event_set(gpr_event *ev, void *value)</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="structgpr__stats__counter_html"><div class="ttname"><a href="structgpr__stats__counter.html">gpr_stats_counter</a></div><div class="ttdef"><b>Definition:</b> sync_generic.h:54</div></div>
<div class="ttc" id="sync__posix_8h_html_a1ad613e07180c0459cda9f3f6d881885"><div class="ttname"><a href="sync__posix_8h.html#a1ad613e07180c0459cda9f3f6d881885">gpr_cv</a></div><div class="ttdeci">pthread_cond_t gpr_cv</div><div class="ttdef"><b>Definition:</b> sync_posix.h:42</div></div>
<div class="ttc" id="sync_8h_html_a16694f755266c254390b041a0f069094"><div class="ttname"><a href="sync_8h.html#a16694f755266c254390b041a0f069094">gpr_mu_init</a></div><div class="ttdeci">void gpr_mu_init(gpr_mu *mu)</div></div>
<div class="ttc" id="structgpr__cancellable_html"><div class="ttname"><a href="structgpr__cancellable.html">gpr_cancellable</a></div><div class="ttdef"><b>Definition:</b> cancellable_platform.h:50</div></div>
<div class="ttc" id="sync_8h_html_a76b570c831b14070c37e708dde91b795"><div class="ttname"><a href="sync_8h.html#a76b570c831b14070c37e708dde91b795">gpr_unref</a></div><div class="ttdeci">int gpr_unref(gpr_refcount *r)</div></div>
<div class="ttc" id="structgpr__mu_html"><div class="ttname"><a href="structgpr__mu.html">gpr_mu</a></div><div class="ttdef"><b>Definition:</b> sync_win32.h:39</div></div>
<div class="ttc" id="sync_8h_html_aa82b7172b992bd33bd6fd4b4dc89e338"><div class="ttname"><a href="sync_8h.html#aa82b7172b992bd33bd6fd4b4dc89e338">gpr_cancellable_destroy</a></div><div class="ttdeci">void gpr_cancellable_destroy(gpr_cancellable *c)</div></div>
<div class="ttc" id="sync_8h_html_a91370fd0eb76bc1323c80815ad6e9cff"><div class="ttname"><a href="sync_8h.html#a91370fd0eb76bc1323c80815ad6e9cff">gpr_mu_unlock</a></div><div class="ttdeci">void gpr_mu_unlock(gpr_mu *mu)</div></div>
<div class="ttc" id="sync_8h_html_aba119d0b92b0bd50e6efa9e2abe07a5f"><div class="ttname"><a href="sync_8h.html#aba119d0b92b0bd50e6efa9e2abe07a5f">gpr_cv_signal</a></div><div class="ttdeci">void gpr_cv_signal(gpr_cv *cv)</div></div>
<div class="ttc" id="sync_8h_html_aec0b0e9b9f084550cdec300da1f31add"><div class="ttname"><a href="sync_8h.html#aec0b0e9b9f084550cdec300da1f31add">gpr_cancellable_init</a></div><div class="ttdeci">void gpr_cancellable_init(gpr_cancellable *c)</div></div>
<div class="ttc" id="sync_8h_html_a895fb73161d2dd1fa19be10d5395001c"><div class="ttname"><a href="sync_8h.html#a895fb73161d2dd1fa19be10d5395001c">gpr_cancellable_cancel</a></div><div class="ttdeci">void gpr_cancellable_cancel(gpr_cancellable *c)</div></div>
<div class="ttc" id="cancellable__platform_8h_html"><div class="ttname"><a href="cancellable__platform_8h.html">cancellable_platform.h</a></div></div>
<div class="ttc" id="sync_8h_html_ad24aac3d86113f0fcffc6c4595da9cb2"><div class="ttname"><a href="sync_8h.html#ad24aac3d86113f0fcffc6c4595da9cb2">gpr_cv_init</a></div><div class="ttdeci">void gpr_cv_init(gpr_cv *cv)</div></div>
<div class="ttc" id="sync_8h_html_a76b8e5de6e1baa4fd66c014417dc0a30"><div class="ttname"><a href="sync_8h.html#a76b8e5de6e1baa4fd66c014417dc0a30">gpr_stats_init</a></div><div class="ttdeci">void gpr_stats_init(gpr_stats_counter *c, gpr_intptr n)</div></div>
<div class="ttc" id="sync_8h_html_ae048c7e762b723821e35a07fd0d85e22"><div class="ttname"><a href="sync_8h.html#ae048c7e762b723821e35a07fd0d85e22">gpr_event_cancellable_wait</a></div><div class="ttdeci">void * gpr_event_cancellable_wait(gpr_event *ev, gpr_timespec abs_deadline, gpr_cancellable *c)</div></div>
<div class="ttc" id="sync_8h_html_a93f37cd27964fda51acd4cd8e6737922"><div class="ttname"><a href="sync_8h.html#a93f37cd27964fda51acd4cd8e6737922">gpr_event_init</a></div><div class="ttdeci">void gpr_event_init(gpr_event *ev)</div></div>
<div class="ttc" id="sync_8h_html_a52ae2524c7dade8cecb9f01ff4792c9e"><div class="ttname"><a href="sync_8h.html#a52ae2524c7dade8cecb9f01ff4792c9e">gpr_mu_destroy</a></div><div class="ttdeci">void gpr_mu_destroy(gpr_mu *mu)</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="structgpr__event_html"><div class="ttname"><a href="structgpr__event.html">gpr_event</a></div><div class="ttdef"><b>Definition:</b> sync_generic.h:41</div></div>
<div class="ttc" id="sync_8h_html_ad5a4b4a5844668d188db89dda6ad205b"><div class="ttname"><a href="sync_8h.html#ad5a4b4a5844668d188db89dda6ad205b">gpr_cv_broadcast</a></div><div class="ttdeci">void gpr_cv_broadcast(gpr_cv *cv)</div></div>
<div class="ttc" id="sync_8h_html_a235584f36572b5410b042ee63cb0740b"><div class="ttname"><a href="sync_8h.html#a235584f36572b5410b042ee63cb0740b">gpr_ref_init</a></div><div class="ttdeci">void gpr_ref_init(gpr_refcount *r, int n)</div></div>
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