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<a href="XrdSysSemWait_8hh.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="preprocessor">#ifndef __SYS_SEMWAIT__</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="preprocessor"></span><span class="preprocessor">#define __SYS_SEMWAIT__</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">/******************************************************************************/</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">/* X r d S y s S e m W a i t */</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment">/* */</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">/* Author: Fabrizio Furano (INFN, 2005) */</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">/* */</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">/* This file is part of the XRootD software suite. */</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment">/* */</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment">/* XRootD is free software: you can redistribute it and/or modify it under */</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment">/* the terms of the GNU Lesser General Public License as published by the */</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment">/* Free Software Foundation, either version 3 of the License, or (at your */</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment">/* option) any later version. */</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment">/* */</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment">/* XRootD is distributed in the hope that it will be useful, but WITHOUT */</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment">/* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or */</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment">/* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public */</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment">/* License for more details. */</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment">/* */</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment">/* You should have received a copy of the GNU Lesser General Public License */</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment">/* along with XRootD in a file called COPYING.LESSER (LGPL license) and file */</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment">/* COPYING (GPL license). If not, see <http://www.gnu.org/licenses/>. */</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment">/* */</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment">/* The copyright holder's institutional names and contributor's names may not */</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment">/* be used to endorse or promote products derived from this software without */</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment">/* specific prior written permission of the institution or contributor. */</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment">/* */</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment">/* A counting semaphore with timed out wait primitive */</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment">/******************************************************************************/</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> </div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="preprocessor">#include "<a class="code" href="XrdSysPthread_8hh.html">XrdSys/XrdSysPthread.hh</a>"</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> </div>
<div class="line"><a name="l00034"></a><span class="lineno"><a class="code" href="classXrdSysSemWait.html"> 34</a></span> <span class="keyword">class </span><a class="code" href="classXrdSysSemWait.html">XrdSysSemWait</a> {</div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <span class="keyword">public</span>:</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> </div>
<div class="line"><a name="l00037"></a><span class="lineno"><a class="code" href="classXrdSysSemWait.html#a3c87c1ba48bb2ce74b9acd0246dfe839"> 37</a></span>  <span class="keywordtype">int</span> <a class="code" href="classXrdSysSemWait.html#a3c87c1ba48bb2ce74b9acd0246dfe839">CondWait</a>() {</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> </div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="keywordtype">int</span> rc = 0;</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="comment">// Wait until the sempahore value is positive. This will not be starvation</span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="comment">// free is the OS implements an unfair mutex;</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <span class="comment">// Returns 0 if signalled, non-0 if would block</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <span class="comment">//</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> </div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <a class="code" href="classXrdSysSemWait.html#ada5c662da4bc7c0e7e0fd09b27c36cef">semVar</a>.<a class="code" href="classXrdSysCondVar.html#a9ec27923fad5c3106f58c339ac52a19c">Lock</a>();</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="keywordflow">if</span> (<a class="code" href="classXrdSysSemWait.html#ad375babfc5eb21816d75d69ead4d143e">semVal</a> > 0) <a class="code" href="classXrdSysSemWait.html#ad375babfc5eb21816d75d69ead4d143e">semVal</a>--;</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  rc = 1;</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  }</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> </div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <a class="code" href="classXrdSysSemWait.html#ada5c662da4bc7c0e7e0fd09b27c36cef">semVar</a>.<a class="code" href="classXrdSysCondVar.html#a5532e7f41a5ec4e3405a072ccb40fd77">UnLock</a>();</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> </div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keywordflow">return</span> rc;</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> </div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  };</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  </div>
<div class="line"><a name="l00057"></a><span class="lineno"><a class="code" href="classXrdSysSemWait.html#aac0952d497b8ca3f5723a5c8d572a630"> 57</a></span>  <span class="keywordtype">void</span> <a class="code" href="classXrdSysSemWait.html#aac0952d497b8ca3f5723a5c8d572a630">Post</a>() {</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="comment">// Add one to the semaphore counter. If we the value is > 0 and there is a</span></div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="comment">// thread waiting for the sempagore, signal it to get the semaphore.</span></div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="comment">//</span></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <a class="code" href="classXrdSysSemWait.html#ada5c662da4bc7c0e7e0fd09b27c36cef">semVar</a>.<a class="code" href="classXrdSysCondVar.html#a9ec27923fad5c3106f58c339ac52a19c">Lock</a>();</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> </div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keywordflow">if</span> (<a class="code" href="classXrdSysSemWait.html#aab9eab93a22f90c774468c1c9a83ace2">semWait</a> > 0) {</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <a class="code" href="classXrdSysSemWait.html#ada5c662da4bc7c0e7e0fd09b27c36cef">semVar</a>.<a class="code" href="classXrdSysCondVar.html#aa7a28f2d20ff69380deb4ff3393e8545">Signal</a>();</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <a class="code" href="classXrdSysSemWait.html#aab9eab93a22f90c774468c1c9a83ace2">semWait</a>--;</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  }</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <a class="code" href="classXrdSysSemWait.html#ad375babfc5eb21816d75d69ead4d143e">semVal</a>++;</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  </div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <a class="code" href="classXrdSysSemWait.html#ada5c662da4bc7c0e7e0fd09b27c36cef">semVar</a>.<a class="code" href="classXrdSysCondVar.html#a5532e7f41a5ec4e3405a072ccb40fd77">UnLock</a>();</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  };</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  </div>
<div class="line"><a name="l00073"></a><span class="lineno"><a class="code" href="classXrdSysSemWait.html#aebb043fde933762a456e1ac2f4f443a2"> 73</a></span>  <span class="keywordtype">void</span> <a class="code" href="classXrdSysSemWait.html#aebb043fde933762a456e1ac2f4f443a2">Wait</a>() {</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="comment">// Wait until the sempahore value is positive. This will not be starvation</span></div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="comment">// free is the OS implements an unfair mutex;</span></div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="comment">//</span></div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> </div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <a class="code" href="classXrdSysSemWait.html#ada5c662da4bc7c0e7e0fd09b27c36cef">semVar</a>.<a class="code" href="classXrdSysCondVar.html#a9ec27923fad5c3106f58c339ac52a19c">Lock</a>();</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <span class="keywordflow">if</span> (<a class="code" href="classXrdSysSemWait.html#ad375babfc5eb21816d75d69ead4d143e">semVal</a> > 0) <a class="code" href="classXrdSysSemWait.html#ad375babfc5eb21816d75d69ead4d143e">semVal</a>--;</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <a class="code" href="classXrdSysSemWait.html#aab9eab93a22f90c774468c1c9a83ace2">semWait</a>++;</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <a class="code" href="classXrdSysSemWait.html#ada5c662da4bc7c0e7e0fd09b27c36cef">semVar</a>.<a class="code" href="classXrdSysCondVar.html#a34a2e6457ee77ec943a888984f354dea">Wait</a>();</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  }</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> </div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <a class="code" href="classXrdSysSemWait.html#ada5c662da4bc7c0e7e0fd09b27c36cef">semVar</a>.<a class="code" href="classXrdSysCondVar.html#a5532e7f41a5ec4e3405a072ccb40fd77">UnLock</a>();</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span> </div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  };</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span> </div>
<div class="line"><a name="l00089"></a><span class="lineno"><a class="code" href="classXrdSysSemWait.html#ac55fe92e61c555c3dfeabac9119c2bc0"> 89</a></span>  <span class="keywordtype">int</span> <a class="code" href="classXrdSysSemWait.html#ac55fe92e61c555c3dfeabac9119c2bc0">Wait</a>(<span class="keywordtype">int</span> secs) {</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keywordtype">int</span> rc = 0;</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  <span class="comment">// Wait until the sempahore value is positive. This will not be starvation</span></div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="comment">// free is the OS implements an unfair mutex;</span></div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="comment">// Returns 0 if signalled, non-0 if timeout</span></div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="comment">//</span></div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span> </div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <a class="code" href="classXrdSysSemWait.html#ada5c662da4bc7c0e7e0fd09b27c36cef">semVar</a>.<a class="code" href="classXrdSysCondVar.html#a9ec27923fad5c3106f58c339ac52a19c">Lock</a>();</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <span class="keywordflow">if</span> (<a class="code" href="classXrdSysSemWait.html#ad375babfc5eb21816d75d69ead4d143e">semVal</a> > 0) <a class="code" href="classXrdSysSemWait.html#ad375babfc5eb21816d75d69ead4d143e">semVal</a>--;</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <a class="code" href="classXrdSysSemWait.html#aab9eab93a22f90c774468c1c9a83ace2">semWait</a>++;</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  rc = <a class="code" href="classXrdSysSemWait.html#ada5c662da4bc7c0e7e0fd09b27c36cef">semVar</a>.<a class="code" href="classXrdSysCondVar.html#a34a2e6457ee77ec943a888984f354dea">Wait</a>(secs);</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="keywordflow">if</span> (rc) <a class="code" href="classXrdSysSemWait.html#aab9eab93a22f90c774468c1c9a83ace2">semWait</a>--;</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  }</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> </div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <a class="code" href="classXrdSysSemWait.html#ada5c662da4bc7c0e7e0fd09b27c36cef">semVar</a>.<a class="code" href="classXrdSysCondVar.html#a5532e7f41a5ec4e3405a072ccb40fd77">UnLock</a>();</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span> </div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="keywordflow">return</span> rc;</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  };</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span> </div>
<div class="line"><a name="l00109"></a><span class="lineno"><a class="code" href="classXrdSysSemWait.html#a3a96e453e924c88745f54ff163b68a3f"> 109</a></span>  <a class="code" href="classXrdSysSemWait.html#a3a96e453e924c88745f54ff163b68a3f">XrdSysSemWait</a>(<span class="keywordtype">int</span> semval=1,<span class="keyword">const</span> <span class="keywordtype">char</span> *cid=0) : <a class="code" href="classXrdSysSemWait.html#ada5c662da4bc7c0e7e0fd09b27c36cef">semVar</a>(0, cid) {</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <a class="code" href="classXrdSysSemWait.html#ad375babfc5eb21816d75d69ead4d143e">semVal</a> = semval; <a class="code" href="classXrdSysSemWait.html#aab9eab93a22f90c774468c1c9a83ace2">semWait</a> = 0;</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  }</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span> </div>
<div class="line"><a name="l00113"></a><span class="lineno"><a class="code" href="classXrdSysSemWait.html#a09c478ef7d28ddc1900dd2b1d7d238bd"> 113</a></span>  <a class="code" href="classXrdSysSemWait.html#a09c478ef7d28ddc1900dd2b1d7d238bd">~XrdSysSemWait</a>() {}</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span> </div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span> <span class="keyword">private</span>:</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span> </div>
<div class="line"><a name="l00117"></a><span class="lineno"><a class="code" href="classXrdSysSemWait.html#ada5c662da4bc7c0e7e0fd09b27c36cef"> 117</a></span> <a class="code" href="classXrdSysCondVar.html">XrdSysCondVar</a> <a class="code" href="classXrdSysSemWait.html#ada5c662da4bc7c0e7e0fd09b27c36cef">semVar</a>;</div>
<div class="line"><a name="l00118"></a><span class="lineno"><a class="code" href="classXrdSysSemWait.html#ad375babfc5eb21816d75d69ead4d143e"> 118</a></span> <span class="keywordtype">int</span> <a class="code" href="classXrdSysSemWait.html#ad375babfc5eb21816d75d69ead4d143e">semVal</a>;</div>
<div class="line"><a name="l00119"></a><span class="lineno"><a class="code" href="classXrdSysSemWait.html#aab9eab93a22f90c774468c1c9a83ace2"> 119</a></span> <span class="keywordtype">int</span> <a class="code" href="classXrdSysSemWait.html#aab9eab93a22f90c774468c1c9a83ace2">semWait</a>;</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span> };</div>
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