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<a href="atm_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_IMPL_CODEGEN_ATM_H</span></div><div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;<span class="preprocessor">#define GRPC_IMPL_CODEGEN_ATM_H</span></div><div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;</div><div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;<span class="comment">/* This interface provides atomic operations and barriers.</span></div><div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;<span class="comment">   It is internal to gpr support code and should not be used outside it.</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">   If an operation with acquire semantics precedes another memory access by the</span></div><div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;<span class="comment">   same thread, the operation will precede that other access as seen by other</span></div><div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;<span class="comment">   threads.</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">   If an operation with release semantics follows another memory access by the</span></div><div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;<span class="comment">   same thread, the operation will follow that other access as seen by other</span></div><div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;<span class="comment">   threads.</span></div><div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;<span class="comment"></span></div><div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;<span class="comment">   Routines with &quot;acq&quot; or &quot;full&quot; in the name have acquire semantics.  Routines</span></div><div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;<span class="comment">   with &quot;rel&quot; or &quot;full&quot; in the name have release semantics.  Routines with</span></div><div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;<span class="comment">   &quot;no_barrier&quot; in the name have neither acquire not release semantics.</span></div><div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;<span class="comment"></span></div><div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;<span class="comment">   The routines may be implemented as macros.</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;<span class="comment">   // Atomic operations act on an intergral_type gpr_atm that is guaranteed to</span></div><div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;<span class="comment">   // be the same size as a pointer.</span></div><div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;<span class="comment">   typedef intptr_t gpr_atm;</span></div><div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;<span class="comment"></span></div><div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;<span class="comment">   // A memory barrier, providing both acquire and release semantics, but not</span></div><div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;<span class="comment">   // otherwise acting on memory.</span></div><div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;<span class="comment">   void gpr_atm_full_barrier(void);</span></div><div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;<span class="comment"></span></div><div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;<span class="comment">   // Atomically return *p, with acquire semantics.</span></div><div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;<span class="comment">   gpr_atm gpr_atm_acq_load(gpr_atm *p);</span></div><div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;<span class="comment"></span></div><div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;<span class="comment">   // Atomically set *p = value, with release semantics.</span></div><div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;<span class="comment">   void gpr_atm_rel_store(gpr_atm *p, gpr_atm value);</span></div><div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;<span class="comment"></span></div><div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;<span class="comment">   // Atomically add delta to *p, and return the old value of *p, with</span></div><div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;<span class="comment">   // the barriers specified.</span></div><div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;<span class="comment">   gpr_atm gpr_atm_no_barrier_fetch_add(gpr_atm *p, gpr_atm delta);</span></div><div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;<span class="comment">   gpr_atm gpr_atm_full_fetch_add(gpr_atm *p, gpr_atm delta);</span></div><div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;<span class="comment"></span></div><div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;<span class="comment">   // Atomically, if *p==o, set *p=n and return non-zero otherwise return 0,</span></div><div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;<span class="comment">   // with the barriers specified if the operation succeeds.</span></div><div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;<span class="comment">   int gpr_atm_no_barrier_cas(gpr_atm *p, gpr_atm o, gpr_atm n);</span></div><div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;<span class="comment">   int gpr_atm_acq_cas(gpr_atm *p, gpr_atm o, gpr_atm n);</span></div><div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;<span class="comment">   int gpr_atm_rel_cas(gpr_atm *p, gpr_atm o, gpr_atm n);</span></div><div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;<span class="comment">*/</span></div><div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;</div><div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;<span class="preprocessor">#include &lt;<a class="code" href="port__platform_8h.html">grpc/impl/codegen/port_platform.h</a>&gt;</span></div><div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;</div><div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;<span class="preprocessor">#if defined(GPR_GCC_ATOMIC)</span></div><div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;<span class="preprocessor">#include &lt;<a class="code" href="atm__gcc__atomic_8h.html">grpc/impl/codegen/atm_gcc_atomic.h</a>&gt;</span></div><div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;<span class="preprocessor">#elif defined(GPR_GCC_SYNC)</span></div><div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;<span class="preprocessor">#include &lt;<a class="code" href="atm__gcc__sync_8h.html">grpc/impl/codegen/atm_gcc_sync.h</a>&gt;</span></div><div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;<span class="preprocessor">#elif defined(GPR_WINDOWS_ATOMIC)</span></div><div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;<span class="preprocessor">#include &lt;<a class="code" href="atm__windows_8h.html">grpc/impl/codegen/atm_windows.h</a>&gt;</span></div><div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;<span class="preprocessor">#else</span></div><div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;<span class="preprocessor">#error could not determine platform for atm</span></div><div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;<span class="preprocessor">#endif</span></div><div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;</div><div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;<span class="preprocessor">#endif </span><span class="comment">/* GRPC_IMPL_CODEGEN_ATM_H */</span><span class="preprocessor"></span></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="atm__gcc__atomic_8h_html"><div class="ttname"><a href="atm__gcc__atomic_8h.html">atm_gcc_atomic.h</a></div></div>
<div class="ttc" id="atm__windows_8h_html"><div class="ttname"><a href="atm__windows_8h.html">atm_windows.h</a></div></div>
<div class="ttc" id="atm__gcc__sync_8h_html"><div class="ttname"><a href="atm__gcc__sync_8h.html">atm_gcc_sync.h</a></div></div>
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