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<td><big><big>ChibiOS/RT</big></big><br><br>Architecture - Reference Manual - Guides</td>
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<h1>chmtx.c</h1> </div>
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<div class="contents">
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<a href="chmtx_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
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<a name="l00002"></a>00002 <span class="comment"> ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 Giovanni Di Sirio.</span>
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<a name="l00003"></a>00003 <span class="comment"></span>
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<a name="l00004"></a>00004 <span class="comment"> This file is part of ChibiOS/RT.</span>
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<a name="l00005"></a>00005 <span class="comment"></span>
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<a name="l00006"></a>00006 <span class="comment"> ChibiOS/RT is free software; you can redistribute it and/or modify</span>
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<a name="l00007"></a>00007 <span class="comment"> it under the terms of the GNU General Public License as published by</span>
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<a name="l00008"></a>00008 <span class="comment"> the Free Software Foundation; either version 3 of the License, or</span>
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<a name="l00009"></a>00009 <span class="comment"> (at your option) any later version.</span>
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<a name="l00010"></a>00010 <span class="comment"></span>
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<a name="l00011"></a>00011 <span class="comment"> ChibiOS/RT is distributed in the hope that it will be useful,</span>
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<a name="l00012"></a>00012 <span class="comment"> but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
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<a name="l00013"></a>00013 <span class="comment"> MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span>
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<a name="l00014"></a>00014 <span class="comment"> GNU General Public License for more details.</span>
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<a name="l00015"></a>00015 <span class="comment"></span>
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<a name="l00016"></a>00016 <span class="comment"> You should have received a copy of the GNU General Public License</span>
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<a name="l00017"></a>00017 <span class="comment"> along with this program. If not, see <http://www.gnu.org/licenses/>.</span>
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<a name="l00018"></a>00018 <span class="comment"></span>
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<a name="l00019"></a>00019 <span class="comment"> ---</span>
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<a name="l00020"></a>00020 <span class="comment"></span>
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<a name="l00021"></a>00021 <span class="comment"> A special exception to the GPL can be applied should you wish to distribute</span>
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<a name="l00022"></a>00022 <span class="comment"> a combined work that includes ChibiOS/RT, without being obliged to provide</span>
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<a name="l00023"></a>00023 <span class="comment"> the source code for any proprietary components. See the file exception.txt</span>
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<a name="l00024"></a>00024 <span class="comment"> for full details of how and when the exception can be applied.</span>
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<a name="l00025"></a>00025 <span class="comment">*/</span>
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<a name="l00026"></a>00026 <span class="comment"></span>
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<a name="l00027"></a>00027 <span class="comment">/**</span>
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<a name="l00028"></a>00028 <span class="comment"> * @file chmtx.c</span>
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<a name="l00029"></a>00029 <span class="comment"> * @brief Mutexes code.</span>
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<a name="l00030"></a>00030 <span class="comment"> *</span>
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<a name="l00031"></a>00031 <span class="comment"> * @addtogroup mutexes</span>
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<a name="l00032"></a>00032 <span class="comment"> * @details Mutexes related APIs and services.</span>
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<a name="l00033"></a>00033 <span class="comment"> *</span>
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<a name="l00034"></a>00034 <span class="comment"> * <h2>Operation mode</h2></span>
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<a name="l00035"></a>00035 <span class="comment"> * A mutex is a threads synchronization object that can be in two</span>
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<a name="l00036"></a>00036 <span class="comment"> * distinct states:</span>
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<a name="l00037"></a>00037 <span class="comment"> * - Not owned.</span>
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<a name="l00038"></a>00038 <span class="comment"> * - Owned by a thread.</span>
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<a name="l00039"></a>00039 <span class="comment"> * .</span>
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<a name="l00040"></a>00040 <span class="comment"> * Operations defined for mutexes:</span>
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<a name="l00041"></a>00041 <span class="comment"> * - <b>Lock</b>: The mutex is checked, if the mutex is not owned by</span>
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<a name="l00042"></a>00042 <span class="comment"> * some other thread then it is associated to the locking thread</span>
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<a name="l00043"></a>00043 <span class="comment"> * else the thread is queued on the mutex in a list ordered by</span>
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<a name="l00044"></a>00044 <span class="comment"> * priority.</span>
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<a name="l00045"></a>00045 <span class="comment"> * - <b>Unlock</b>: The mutex is released by the owner and the highest</span>
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<a name="l00046"></a>00046 <span class="comment"> * priority thread waiting in the queue, if any, is resumed and made</span>
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<a name="l00047"></a>00047 <span class="comment"> * owner of the mutex.</span>
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<a name="l00048"></a>00048 <span class="comment"> * .</span>
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<a name="l00049"></a>00049 <span class="comment"> * In order to use the Mutexes APIs the @p CH_USE_MUTEXES option must</span>
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<a name="l00050"></a>00050 <span class="comment"> * be enabled in @p chconf.h.</span>
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<a name="l00051"></a>00051 <span class="comment"> * <h2>Constraints</h2></span>
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<a name="l00052"></a>00052 <span class="comment"> * In ChibiOS/RT the Unlock operations are always performed in</span>
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<a name="l00053"></a>00053 <span class="comment"> * lock-reverse order. The unlock API does not even have a parameter,</span>
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<a name="l00054"></a>00054 <span class="comment"> * the mutex to unlock is selected from an internal, per-thread, stack</span>
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<a name="l00055"></a>00055 <span class="comment"> * of owned mutexes. This both improves the performance and is</span>
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<a name="l00056"></a>00056 <span class="comment"> * required for an efficient implementation of the priority</span>
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<a name="l00057"></a>00057 <span class="comment"> * inheritance mechanism.</span>
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<a name="l00058"></a>00058 <span class="comment"> *</span>
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<a name="l00059"></a>00059 <span class="comment"> * <h2>The priority inversion problem</h2></span>
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<a name="l00060"></a>00060 <span class="comment"> * The mutexes in ChibiOS/RT implements the <b>full</b> priority</span>
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<a name="l00061"></a>00061 <span class="comment"> * inheritance mechanism in order handle the priority inversion</span>
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<a name="l00062"></a>00062 <span class="comment"> * problem.<br></span>
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<a name="l00063"></a>00063 <span class="comment"> * When a thread is queued on a mutex, any thread, directly or</span>
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<a name="l00064"></a>00064 <span class="comment"> * indirectly, holding the mutex gains the same priority of the</span>
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<a name="l00065"></a>00065 <span class="comment"> * waiting thread (if their priority was not already equal or higher).</span>
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<a name="l00066"></a>00066 <span class="comment"> * The mechanism works with any number of nested mutexes and any</span>
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<a name="l00067"></a>00067 <span class="comment"> * number of involved threads. The algorithm complexity (worst case)</span>
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<a name="l00068"></a>00068 <span class="comment"> * is N with N equal to the number of nested mutexes.</span>
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<a name="l00069"></a>00069 <span class="comment"> * @{</span>
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<a name="l00070"></a>00070 <span class="comment"> */</span>
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<a name="l00071"></a>00071
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<a name="l00072"></a>00072 <span class="preprocessor">#include "<a class="code" href="ch_8h.html" title="ChibiOS/RT main include file.">ch.h</a>"</span>
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<a name="l00073"></a>00073
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<a name="l00074"></a>00074 <span class="preprocessor">#if CH_USE_MUTEXES</span>
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<a name="l00075"></a>00075 <span class="preprocessor"></span><span class="comment"></span>
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<a name="l00076"></a>00076 <span class="comment">/**</span>
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<a name="l00077"></a>00077 <span class="comment"> * @brief Initializes s @p Mutex structure.</span>
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<a name="l00078"></a>00078 <span class="comment"> *</span>
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<a name="l00079"></a>00079 <span class="comment"> * @param[out] mp pointer to a @p Mutex structure</span>
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<a name="l00080"></a>00080 <span class="comment"> */</span>
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<a name="l00081"></a><a class="code" href="group__mutexes.html#gac55fe4d05aa6bbeb31594193d2e4d2b6">00081</a> <span class="keywordtype">void</span> <a class="code" href="group__mutexes.html#gac55fe4d05aa6bbeb31594193d2e4d2b6" title="Initializes s Mutex structure.">chMtxInit</a>(<a class="code" href="struct_mutex.html" title="Mutex structure.">Mutex</a> *mp) {
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<a name="l00082"></a>00082
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<a name="l00083"></a>00083 <a class="code" href="group__debug.html#ga6bb6c0f97caab3a66332c8bfbf7a3844" title="Function parameter check.">chDbgCheck</a>(mp != NULL, <span class="stringliteral">"chMtxInit"</span>);
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<a name="l00084"></a>00084
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<a name="l00085"></a>00085 <a class="code" href="group__internals.html#ga6d19d0f3ff1fa599b6d9783dec180451" title="Threads queue initialization.">queue_init</a>(&mp-><a class="code" href="struct_mutex.html#ad3efd6941b40b1415b5fe40e804d4b6f" title="Queue of the threads sleeping on this Mutex.">m_queue</a>);
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<a name="l00086"></a>00086 mp-><a class="code" href="struct_mutex.html#ad83ff6b7d8b483f91a080ae8c53a4941" title="Owner Thread pointer or NULL.">m_owner</a> = NULL;
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<a name="l00087"></a>00087 }
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<a name="l00088"></a>00088 <span class="comment"></span>
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<a name="l00089"></a>00089 <span class="comment">/**</span>
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<a name="l00090"></a>00090 <span class="comment"> * @brief Locks the specified mutex.</span>
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<a name="l00091"></a>00091 <span class="comment"> *</span>
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<a name="l00092"></a>00092 <span class="comment"> * @param[in] mp pointer to the @p Mutex structure</span>
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<a name="l00093"></a>00093 <span class="comment"> */</span>
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<a name="l00094"></a><a class="code" href="group__mutexes.html#gafa06b82e3496c44eb7bf31d9f1b655ba">00094</a> <span class="keywordtype">void</span> <a class="code" href="group__mutexes.html#gafa06b82e3496c44eb7bf31d9f1b655ba" title="Locks the specified mutex.">chMtxLock</a>(<a class="code" href="struct_mutex.html" title="Mutex structure.">Mutex</a> *mp) {
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<a name="l00095"></a>00095
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<a name="l00096"></a>00096 <a class="code" href="group__system.html#ga9f6573c0763d1e4e97c63c62edad6e42" title="Enters the kernel lock mode.">chSysLock</a>();
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<a name="l00097"></a>00097
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<a name="l00098"></a>00098 <a class="code" href="group__mutexes.html#ga2d6350c2d147d1165c359f30798205f5" title="Locks the specified mutex.">chMtxLockS</a>(mp);
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<a name="l00099"></a>00099
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<a name="l00100"></a>00100 <a class="code" href="group__system.html#ga5a257fa58a09815eb64a45e2dfbdc22e" title="Leaves the kernel lock mode.">chSysUnlock</a>();
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<a name="l00101"></a>00101 }
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<a name="l00102"></a>00102 <span class="comment"></span>
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<a name="l00103"></a>00103 <span class="comment">/**</span>
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<a name="l00104"></a>00104 <span class="comment"> * @brief Locks the specified mutex.</span>
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<a name="l00105"></a>00105 <span class="comment"> *</span>
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<a name="l00106"></a>00106 <span class="comment"> * @param[in] mp pointer to the @p Mutex structure</span>
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<a name="l00107"></a>00107 <span class="comment"> */</span>
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<a name="l00108"></a><a class="code" href="group__mutexes.html#ga2d6350c2d147d1165c359f30798205f5">00108</a> <span class="keywordtype">void</span> <a class="code" href="group__mutexes.html#ga2d6350c2d147d1165c359f30798205f5" title="Locks the specified mutex.">chMtxLockS</a>(<a class="code" href="struct_mutex.html" title="Mutex structure.">Mutex</a> *mp) {
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<a name="l00109"></a>00109 <a class="code" href="struct_thread.html" title="Structure representing a thread.">Thread</a> *ctp = currp;
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<a name="l00110"></a>00110
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<a name="l00111"></a>00111 <a class="code" href="group__debug.html#ga6bb6c0f97caab3a66332c8bfbf7a3844" title="Function parameter check.">chDbgCheck</a>(mp != NULL, <span class="stringliteral">"chMtxLockS"</span>);
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<a name="l00112"></a>00112
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<a name="l00113"></a>00113 <span class="comment">/* Ia the mutex already locked? */</span>
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<a name="l00114"></a>00114 <span class="keywordflow">if</span> (mp-><a class="code" href="struct_mutex.html#ad83ff6b7d8b483f91a080ae8c53a4941" title="Owner Thread pointer or NULL.">m_owner</a> != NULL) {
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<a name="l00115"></a>00115 <span class="comment">/* Priority inheritance protocol; explores the thread-mutex dependencies</span>
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<a name="l00116"></a>00116 <span class="comment"> boosting the priority of all the affected threads to equal the priority</span>
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<a name="l00117"></a>00117 <span class="comment"> of the running thread requesting the mutex.*/</span>
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<a name="l00118"></a>00118 <a class="code" href="struct_thread.html" title="Structure representing a thread.">Thread</a> *tp = mp-><a class="code" href="struct_mutex.html#ad83ff6b7d8b483f91a080ae8c53a4941" title="Owner Thread pointer or NULL.">m_owner</a>;
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<a name="l00119"></a>00119 <span class="comment">/* Does the running thread have higher priority than the mutex</span>
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<a name="l00120"></a>00120 <span class="comment"> ownning thread? */</span>
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<a name="l00121"></a>00121 <span class="keywordflow">while</span> (tp-><a class="code" href="struct_thread.html#ae60cc22956f4c19965cb94045333aa9c" title="Thread priority.">p_prio</a> < ctp-><a class="code" href="struct_thread.html#ae60cc22956f4c19965cb94045333aa9c" title="Thread priority.">p_prio</a>) {
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<a name="l00122"></a>00122 <span class="comment">/* Make priority of thread tp match the running thread's priority.*/</span>
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<a name="l00123"></a>00123 tp-><a class="code" href="struct_thread.html#ae60cc22956f4c19965cb94045333aa9c" title="Thread priority.">p_prio</a> = ctp-><a class="code" href="struct_thread.html#ae60cc22956f4c19965cb94045333aa9c" title="Thread priority.">p_prio</a>;
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<a name="l00124"></a>00124 <span class="comment">/* The following states need priority queues reordering.*/</span>
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<a name="l00125"></a>00125 <span class="keywordflow">switch</span> (tp-><a class="code" href="struct_thread.html#a3c3e9d6abccb62c3a5fab6ef043a391f" title="Current thread state.">p_state</a>) {
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<a name="l00126"></a>00126 <span class="keywordflow">case</span> <a class="code" href="group__threads.html#gac18de5096ff3c841e69672cab0868cdf" title="Thread state: Waiting on a mutex.">THD_STATE_WTMTX</a>:
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<a name="l00127"></a>00127 <span class="comment">/* Re-enqueues the mutex owner with its new priority.*/</span>
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<a name="l00128"></a>00128 <a class="code" href="group__internals.html#ga02226b866ae704435baf2ffe259ba0b2" title="Inserts a thread into a priority ordered queue.">prio_insert</a>(<a class="code" href="group__internals.html#gafff11bcd31d7dc3d1a0a6c66f3fc6ec9" title="Removes a Thread from a queue and returns it.">dequeue</a>(tp), (<a class="code" href="struct_threads_queue.html" title="Generic threads bidirectional linked list header and element.">ThreadsQueue</a> *)tp-><a class="code" href="struct_thread.html#a72cd0424b6098ca241fac1f74d21b56a" title="State-specific fields.">p_u</a>.<a class="code" href="struct_thread.html#a4f016b01444741e6f9b420436b748862" title="Pointer to a generic &quot;wait&quot; object.">wtobjp</a>);
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<a name="l00129"></a>00129 tp = ((<a class="code" href="struct_mutex.html" title="Mutex structure.">Mutex</a> *)tp-><a class="code" href="struct_thread.html#a72cd0424b6098ca241fac1f74d21b56a" title="State-specific fields.">p_u</a>.<a class="code" href="struct_thread.html#a4f016b01444741e6f9b420436b748862" title="Pointer to a generic &quot;wait&quot; object.">wtobjp</a>)->m_owner;
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<a name="l00130"></a>00130 <span class="keywordflow">continue</span>;
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<a name="l00131"></a>00131 <span class="preprocessor">#if CH_USE_CONDVARS | CH_USE_SEMAPHORES_PRIORITY | CH_USE_MESSAGES_PRIORITY</span>
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<a name="l00132"></a>00132 <span class="preprocessor"></span><span class="preprocessor">#if CH_USE_CONDVARS</span>
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<a name="l00133"></a>00133 <span class="preprocessor"></span> <span class="keywordflow">case</span> <a class="code" href="group__threads.html#ga286c5b1a6459d654d5794fc17e93c939" title="Thread state: Waiting in chCondWait().">THD_STATE_WTCOND</a>:
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<a name="l00134"></a>00134 <span class="preprocessor">#endif</span>
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<a name="l00135"></a>00135 <span class="preprocessor"></span><span class="preprocessor">#if CH_USE_SEMAPHORES_PRIORITY</span>
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<a name="l00136"></a>00136 <span class="preprocessor"></span> <span class="keywordflow">case</span> <a class="code" href="group__threads.html#gad0b81cae859c0a6bc6a0d2036aa8e272" title="Thread state: Waiting on a semaphore.">THD_STATE_WTSEM</a>:
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<a name="l00137"></a>00137 <span class="preprocessor">#endif</span>
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<a name="l00138"></a>00138 <span class="preprocessor"></span><span class="preprocessor">#if CH_USE_MESSAGES_PRIORITY</span>
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<a name="l00139"></a>00139 <span class="preprocessor"></span> <span class="keywordflow">case</span> <a class="code" href="group__threads.html#gaff813590802bfd53cbf0560b680b89f5" title="Thread state: Waiting in chMsgSend().">THD_STATE_SNDMSG</a>:
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<a name="l00140"></a>00140 <span class="preprocessor">#endif</span>
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<a name="l00141"></a>00141 <span class="preprocessor"></span> <span class="comment">/* Re-enqueues tp with its new priority on the queue.*/</span>
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<a name="l00142"></a>00142 <a class="code" href="group__internals.html#ga02226b866ae704435baf2ffe259ba0b2" title="Inserts a thread into a priority ordered queue.">prio_insert</a>(<a class="code" href="group__internals.html#gafff11bcd31d7dc3d1a0a6c66f3fc6ec9" title="Removes a Thread from a queue and returns it.">dequeue</a>(tp), (<a class="code" href="struct_threads_queue.html" title="Generic threads bidirectional linked list header and element.">ThreadsQueue</a> *)tp-><a class="code" href="struct_thread.html#a72cd0424b6098ca241fac1f74d21b56a" title="State-specific fields.">p_u</a>.<a class="code" href="struct_thread.html#a4f016b01444741e6f9b420436b748862" title="Pointer to a generic &quot;wait&quot; object.">wtobjp</a>);
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<a name="l00143"></a>00143 <span class="keywordflow">break</span>;
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<a name="l00144"></a>00144 <span class="preprocessor">#endif</span>
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<a name="l00145"></a>00145 <span class="preprocessor"></span> <span class="keywordflow">case</span> <a class="code" href="group__threads.html#ga1f7b83c73a5b850a3f33bddbdb024fb3" title="Thread state: Ready to run, waiting on the ready list.">THD_STATE_READY</a>:
|
|
<a name="l00146"></a>00146 <span class="comment">/* Re-enqueues tp with its new priority on the ready list.*/</span>
|
|
<a name="l00147"></a>00147 <a class="code" href="group__scheduler.html#ga535d58cfb3436c8d4e4586c31c062298" title="Inserts a thread in the Ready List.">chSchReadyI</a>(<a class="code" href="group__internals.html#gafff11bcd31d7dc3d1a0a6c66f3fc6ec9" title="Removes a Thread from a queue and returns it.">dequeue</a>(tp));
|
|
<a name="l00148"></a>00148 }
|
|
<a name="l00149"></a>00149 <span class="keywordflow">break</span>;
|
|
<a name="l00150"></a>00150 }
|
|
<a name="l00151"></a>00151 <span class="comment">/* Sleep on the mutex.*/</span>
|
|
<a name="l00152"></a>00152 <a class="code" href="group__internals.html#ga02226b866ae704435baf2ffe259ba0b2" title="Inserts a thread into a priority ordered queue.">prio_insert</a>(ctp, &mp-><a class="code" href="struct_mutex.html#ad3efd6941b40b1415b5fe40e804d4b6f" title="Queue of the threads sleeping on this Mutex.">m_queue</a>);
|
|
<a name="l00153"></a>00153 ctp-><a class="code" href="struct_thread.html#a72cd0424b6098ca241fac1f74d21b56a" title="State-specific fields.">p_u</a>.<a class="code" href="struct_thread.html#a4f016b01444741e6f9b420436b748862" title="Pointer to a generic &quot;wait&quot; object.">wtobjp</a> = mp;
|
|
<a name="l00154"></a>00154 <a class="code" href="group__scheduler.html#ga97c1c514b755a1e71caf2f19c1ccf986" title="Puts the current thread to sleep into the specified state.">chSchGoSleepS</a>(<a class="code" href="group__threads.html#gac18de5096ff3c841e69672cab0868cdf" title="Thread state: Waiting on a mutex.">THD_STATE_WTMTX</a>);
|
|
<a name="l00155"></a>00155 <span class="comment">/* It is assumed that the thread performing the unlock operation assigns</span>
|
|
<a name="l00156"></a>00156 <span class="comment"> the mutex to this thread.*/</span>
|
|
<a name="l00157"></a>00157 <a class="code" href="group__debug.html#ga43d50c69eb730d0f024eb832d61f30c9" title="Condition assertion.">chDbgAssert</a>(mp-><a class="code" href="struct_mutex.html#ad83ff6b7d8b483f91a080ae8c53a4941" title="Owner Thread pointer or NULL.">m_owner</a> == ctp, <span class="stringliteral">"chMtxLockS(), #1"</span>, <span class="stringliteral">"not owner"</span>);
|
|
<a name="l00158"></a>00158 <a class="code" href="group__debug.html#ga43d50c69eb730d0f024eb832d61f30c9" title="Condition assertion.">chDbgAssert</a>(ctp-><a class="code" href="struct_thread.html#a3ae80b4b3de4c7a23c542ca251e1f017" title="List of the mutexes owned by this thread.">p_mtxlist</a> == mp, <span class="stringliteral">"chMtxLockS(), #2"</span>, <span class="stringliteral">"not owned"</span>);
|
|
<a name="l00159"></a>00159 }
|
|
<a name="l00160"></a>00160 <span class="keywordflow">else</span> {
|
|
<a name="l00161"></a>00161 <span class="comment">/* It was not owned, inserted in the owned mutexes list.*/</span>
|
|
<a name="l00162"></a>00162 mp-><a class="code" href="struct_mutex.html#ad83ff6b7d8b483f91a080ae8c53a4941" title="Owner Thread pointer or NULL.">m_owner</a> = ctp;
|
|
<a name="l00163"></a>00163 mp-><a class="code" href="struct_mutex.html#aa2113b554e5f0deefbc20dbadfd3d1dd" title="Next Mutex into an owner-list or NULL.">m_next</a> = ctp-><a class="code" href="struct_thread.html#a3ae80b4b3de4c7a23c542ca251e1f017" title="List of the mutexes owned by this thread.">p_mtxlist</a>;
|
|
<a name="l00164"></a>00164 ctp-><a class="code" href="struct_thread.html#a3ae80b4b3de4c7a23c542ca251e1f017" title="List of the mutexes owned by this thread.">p_mtxlist</a> = mp;
|
|
<a name="l00165"></a>00165 }
|
|
<a name="l00166"></a>00166 }
|
|
<a name="l00167"></a>00167 <span class="comment"></span>
|
|
<a name="l00168"></a>00168 <span class="comment">/**</span>
|
|
<a name="l00169"></a>00169 <span class="comment"> * @brief Tries to lock a mutex.</span>
|
|
<a name="l00170"></a>00170 <span class="comment"> * @details This function does not have any overhead related to</span>
|
|
<a name="l00171"></a>00171 <span class="comment"> * the priority inheritance mechanism because it does not try to</span>
|
|
<a name="l00172"></a>00172 <span class="comment"> * enter a sleep state on the mutex.</span>
|
|
<a name="l00173"></a>00173 <span class="comment"> *</span>
|
|
<a name="l00174"></a>00174 <span class="comment"> * @param[in] mp pointer to the @p Mutex structure</span>
|
|
<a name="l00175"></a>00175 <span class="comment"> * @retval TRUE if the mutex was successfully acquired</span>
|
|
<a name="l00176"></a>00176 <span class="comment"> * @retval FALSE if the lock attempt failed.</span>
|
|
<a name="l00177"></a>00177 <span class="comment"> */</span>
|
|
<a name="l00178"></a><a class="code" href="group__mutexes.html#gaada14e216460dc55e1816234168cf95c">00178</a> <a class="code" href="group__types.html#ga7556af1cb61728b53228fa3af1c851de" title="Boolean, recommended the fastest signed.">bool_t</a> <a class="code" href="group__mutexes.html#gaada14e216460dc55e1816234168cf95c" title="Tries to lock a mutex.">chMtxTryLock</a>(<a class="code" href="struct_mutex.html" title="Mutex structure.">Mutex</a> *mp) {
|
|
<a name="l00179"></a>00179 <a class="code" href="group__types.html#ga7556af1cb61728b53228fa3af1c851de" title="Boolean, recommended the fastest signed.">bool_t</a> b;
|
|
<a name="l00180"></a>00180
|
|
<a name="l00181"></a>00181 <a class="code" href="group__system.html#ga9f6573c0763d1e4e97c63c62edad6e42" title="Enters the kernel lock mode.">chSysLock</a>();
|
|
<a name="l00182"></a>00182
|
|
<a name="l00183"></a>00183 b = <a class="code" href="group__mutexes.html#gadbf0bd4a36b1f7e33ee41939df32ab78" title="Tries to lock a mutex.">chMtxTryLockS</a>(mp);
|
|
<a name="l00184"></a>00184
|
|
<a name="l00185"></a>00185 <a class="code" href="group__system.html#ga5a257fa58a09815eb64a45e2dfbdc22e" title="Leaves the kernel lock mode.">chSysUnlock</a>();
|
|
<a name="l00186"></a>00186 <span class="keywordflow">return</span> b;
|
|
<a name="l00187"></a>00187 }
|
|
<a name="l00188"></a>00188 <span class="comment"></span>
|
|
<a name="l00189"></a>00189 <span class="comment">/**</span>
|
|
<a name="l00190"></a>00190 <span class="comment"> * @brief Tries to lock a mutex.</span>
|
|
<a name="l00191"></a>00191 <span class="comment"> * @details This function does not have any overhead related to</span>
|
|
<a name="l00192"></a>00192 <span class="comment"> * the priority inheritance mechanism because it does not try to</span>
|
|
<a name="l00193"></a>00193 <span class="comment"> * enter a sleep state on the mutex.</span>
|
|
<a name="l00194"></a>00194 <span class="comment"> *</span>
|
|
<a name="l00195"></a>00195 <span class="comment"> * @param[in] mp pointer to the @p Mutex structure</span>
|
|
<a name="l00196"></a>00196 <span class="comment"> * @retval TRUE if the mutex was successfully acquired</span>
|
|
<a name="l00197"></a>00197 <span class="comment"> * @retval FALSE if the lock attempt failed.</span>
|
|
<a name="l00198"></a>00198 <span class="comment"> */</span>
|
|
<a name="l00199"></a><a class="code" href="group__mutexes.html#gadbf0bd4a36b1f7e33ee41939df32ab78">00199</a> <a class="code" href="group__types.html#ga7556af1cb61728b53228fa3af1c851de" title="Boolean, recommended the fastest signed.">bool_t</a> <a class="code" href="group__mutexes.html#gadbf0bd4a36b1f7e33ee41939df32ab78" title="Tries to lock a mutex.">chMtxTryLockS</a>(<a class="code" href="struct_mutex.html" title="Mutex structure.">Mutex</a> *mp) {
|
|
<a name="l00200"></a>00200
|
|
<a name="l00201"></a>00201 <a class="code" href="group__debug.html#ga6bb6c0f97caab3a66332c8bfbf7a3844" title="Function parameter check.">chDbgCheck</a>(mp != NULL, <span class="stringliteral">"chMtxTryLockS"</span>);
|
|
<a name="l00202"></a>00202
|
|
<a name="l00203"></a>00203 <span class="keywordflow">if</span> (mp-><a class="code" href="struct_mutex.html#ad83ff6b7d8b483f91a080ae8c53a4941" title="Owner Thread pointer or NULL.">m_owner</a> != NULL)
|
|
<a name="l00204"></a>00204 <span class="keywordflow">return</span> FALSE;
|
|
<a name="l00205"></a>00205 mp-><a class="code" href="struct_mutex.html#ad83ff6b7d8b483f91a080ae8c53a4941" title="Owner Thread pointer or NULL.">m_owner</a> = currp;
|
|
<a name="l00206"></a>00206 mp-><a class="code" href="struct_mutex.html#aa2113b554e5f0deefbc20dbadfd3d1dd" title="Next Mutex into an owner-list or NULL.">m_next</a> = <a class="code" href="group__scheduler.html#ga1a5fddde56420e8accd0c09c1abb32a7" title="Current thread pointer access macro.">currp</a>->p_mtxlist;
|
|
<a name="l00207"></a>00207 <a class="code" href="group__scheduler.html#ga1a5fddde56420e8accd0c09c1abb32a7" title="Current thread pointer access macro.">currp</a>->p_mtxlist = mp;
|
|
<a name="l00208"></a>00208 <span class="keywordflow">return</span> TRUE;
|
|
<a name="l00209"></a>00209 }
|
|
<a name="l00210"></a>00210 <span class="comment"></span>
|
|
<a name="l00211"></a>00211 <span class="comment">/**</span>
|
|
<a name="l00212"></a>00212 <span class="comment"> * @brief Unlocks the next owned mutex in reverse lock order.</span>
|
|
<a name="l00213"></a>00213 <span class="comment"> *</span>
|
|
<a name="l00214"></a>00214 <span class="comment"> * @return The pointer to the unlocked mutex.</span>
|
|
<a name="l00215"></a>00215 <span class="comment"> */</span>
|
|
<a name="l00216"></a><a class="code" href="group__mutexes.html#gae9ae07165126c9f6c0ce0b17bdb53669">00216</a> <a class="code" href="struct_mutex.html" title="Mutex structure.">Mutex</a> *<a class="code" href="group__mutexes.html#gae9ae07165126c9f6c0ce0b17bdb53669" title="Unlocks the next owned mutex in reverse lock order.">chMtxUnlock</a>(<span class="keywordtype">void</span>) {
|
|
<a name="l00217"></a>00217 <a class="code" href="struct_thread.html" title="Structure representing a thread.">Thread</a> *ctp = currp;
|
|
<a name="l00218"></a>00218 <a class="code" href="struct_mutex.html" title="Mutex structure.">Mutex</a> *ump, *mp;
|
|
<a name="l00219"></a>00219
|
|
<a name="l00220"></a>00220 <a class="code" href="group__system.html#ga9f6573c0763d1e4e97c63c62edad6e42" title="Enters the kernel lock mode.">chSysLock</a>();
|
|
<a name="l00221"></a>00221 <a class="code" href="group__debug.html#ga43d50c69eb730d0f024eb832d61f30c9" title="Condition assertion.">chDbgAssert</a>(ctp-><a class="code" href="struct_thread.html#a3ae80b4b3de4c7a23c542ca251e1f017" title="List of the mutexes owned by this thread.">p_mtxlist</a> != NULL,
|
|
<a name="l00222"></a>00222 <span class="stringliteral">"chMtxUnlock(), #1"</span>,
|
|
<a name="l00223"></a>00223 <span class="stringliteral">"owned mutexes list empty"</span>);
|
|
<a name="l00224"></a>00224 <a class="code" href="group__debug.html#ga43d50c69eb730d0f024eb832d61f30c9" title="Condition assertion.">chDbgAssert</a>(ctp-><a class="code" href="struct_thread.html#a3ae80b4b3de4c7a23c542ca251e1f017" title="List of the mutexes owned by this thread.">p_mtxlist</a>-><a class="code" href="struct_mutex.html#ad83ff6b7d8b483f91a080ae8c53a4941" title="Owner Thread pointer or NULL.">m_owner</a> == ctp,
|
|
<a name="l00225"></a>00225 <span class="stringliteral">"chMtxUnlock(), #2"</span>,
|
|
<a name="l00226"></a>00226 <span class="stringliteral">"ownership failure"</span>);
|
|
<a name="l00227"></a>00227 <span class="comment">/* Removes the top Mutex from the Threads's owned mutexes list and matk it</span>
|
|
<a name="l00228"></a>00228 <span class="comment"> as not owned.*/</span>
|
|
<a name="l00229"></a>00229 ump = ctp-><a class="code" href="struct_thread.html#a3ae80b4b3de4c7a23c542ca251e1f017" title="List of the mutexes owned by this thread.">p_mtxlist</a>;
|
|
<a name="l00230"></a>00230 ctp-><a class="code" href="struct_thread.html#a3ae80b4b3de4c7a23c542ca251e1f017" title="List of the mutexes owned by this thread.">p_mtxlist</a> = ump-><a class="code" href="struct_mutex.html#aa2113b554e5f0deefbc20dbadfd3d1dd" title="Next Mutex into an owner-list or NULL.">m_next</a>;
|
|
<a name="l00231"></a>00231 <span class="comment">/* If a thread is waiting on the mutex then the fun part begins.*/</span>
|
|
<a name="l00232"></a>00232 <span class="keywordflow">if</span> (<a class="code" href="group__mutexes.html#ga322ebcfba68cf5b66b9c315638e3ae63" title="Returns TRUE if the mutex queue contains at least a waiting thread.">chMtxQueueNotEmptyS</a>(ump)) {
|
|
<a name="l00233"></a>00233 <a class="code" href="struct_thread.html" title="Structure representing a thread.">Thread</a> *tp;
|
|
<a name="l00234"></a>00234
|
|
<a name="l00235"></a>00235 <span class="comment">/* Recalculates the optimal thread priority by scanning the owned</span>
|
|
<a name="l00236"></a>00236 <span class="comment"> mutexes list.*/</span>
|
|
<a name="l00237"></a>00237 <a class="code" href="group__types.html#ga5f2488ba73e5969cbc0f7033735374ee" title="Priority, use the fastest unsigned type.">tprio_t</a> newprio = ctp-><a class="code" href="struct_thread.html#a38de11dd7f8cdcfbc45b2c467f400fe8" title="Thread&#39;s own, non-inherited, priority.">p_realprio</a>;
|
|
<a name="l00238"></a>00238 mp = ctp-><a class="code" href="struct_thread.html#a3ae80b4b3de4c7a23c542ca251e1f017" title="List of the mutexes owned by this thread.">p_mtxlist</a>;
|
|
<a name="l00239"></a>00239 <span class="keywordflow">while</span> (mp != NULL) {
|
|
<a name="l00240"></a>00240 <span class="comment">/* If the highest priority thread waiting in the mutexes list has a</span>
|
|
<a name="l00241"></a>00241 <span class="comment"> greater priority than the current thread base priority then the final</span>
|
|
<a name="l00242"></a>00242 <span class="comment"> priority will have at least that priority.*/</span>
|
|
<a name="l00243"></a>00243 <span class="keywordflow">if</span> (<a class="code" href="group__mutexes.html#ga322ebcfba68cf5b66b9c315638e3ae63" title="Returns TRUE if the mutex queue contains at least a waiting thread.">chMtxQueueNotEmptyS</a>(mp) && (mp-><a class="code" href="struct_mutex.html#ad3efd6941b40b1415b5fe40e804d4b6f" title="Queue of the threads sleeping on this Mutex.">m_queue</a>.<a class="code" href="struct_threads_queue.html#af4a099c245d7ceecdf2f9755d05d0ed0">p_next</a>-><a class="code" href="struct_thread.html#ae60cc22956f4c19965cb94045333aa9c" title="Thread priority.">p_prio</a> > newprio))
|
|
<a name="l00244"></a>00244 newprio = mp-><a class="code" href="struct_mutex.html#ad3efd6941b40b1415b5fe40e804d4b6f" title="Queue of the threads sleeping on this Mutex.">m_queue</a>.<a class="code" href="struct_threads_queue.html#af4a099c245d7ceecdf2f9755d05d0ed0">p_next</a>-><a class="code" href="struct_thread.html#ae60cc22956f4c19965cb94045333aa9c" title="Thread priority.">p_prio</a>;
|
|
<a name="l00245"></a>00245 mp = mp-><a class="code" href="struct_mutex.html#aa2113b554e5f0deefbc20dbadfd3d1dd" title="Next Mutex into an owner-list or NULL.">m_next</a>;
|
|
<a name="l00246"></a>00246 }
|
|
<a name="l00247"></a>00247 <span class="comment">/* Assigns to the current thread the highest priority among all the</span>
|
|
<a name="l00248"></a>00248 <span class="comment"> waiting threads.*/</span>
|
|
<a name="l00249"></a>00249 ctp-><a class="code" href="struct_thread.html#ae60cc22956f4c19965cb94045333aa9c" title="Thread priority.">p_prio</a> = newprio;
|
|
<a name="l00250"></a>00250 <span class="comment">/* Awakens the highest priority thread waiting for the unlocked mutex and</span>
|
|
<a name="l00251"></a>00251 <span class="comment"> assigns the mutex to it.*/</span>
|
|
<a name="l00252"></a>00252 tp = <a class="code" href="group__internals.html#ga042479f09357fc59befebf4dfe0e9f4a" title="Removes the first-out Thread from a queue and returns it.">fifo_remove</a>(&ump-><a class="code" href="struct_mutex.html#ad3efd6941b40b1415b5fe40e804d4b6f" title="Queue of the threads sleeping on this Mutex.">m_queue</a>);
|
|
<a name="l00253"></a>00253 ump-><a class="code" href="struct_mutex.html#ad83ff6b7d8b483f91a080ae8c53a4941" title="Owner Thread pointer or NULL.">m_owner</a> = tp;
|
|
<a name="l00254"></a>00254 ump-><a class="code" href="struct_mutex.html#aa2113b554e5f0deefbc20dbadfd3d1dd" title="Next Mutex into an owner-list or NULL.">m_next</a> = tp-><a class="code" href="struct_thread.html#a3ae80b4b3de4c7a23c542ca251e1f017" title="List of the mutexes owned by this thread.">p_mtxlist</a>;
|
|
<a name="l00255"></a>00255 tp-><a class="code" href="struct_thread.html#a3ae80b4b3de4c7a23c542ca251e1f017" title="List of the mutexes owned by this thread.">p_mtxlist</a> = ump;
|
|
<a name="l00256"></a>00256 <a class="code" href="group__scheduler.html#gae47a8819a21ef2d521124e76bfb37c95" title="Wakes up a thread.">chSchWakeupS</a>(tp, <a class="code" href="group__scheduler.html#gae1c86078318e11c2fa57ee3c2ec69f61" title="Default thread wakeup low level message.">RDY_OK</a>);
|
|
<a name="l00257"></a>00257 }
|
|
<a name="l00258"></a>00258 <span class="keywordflow">else</span>
|
|
<a name="l00259"></a>00259 ump-><a class="code" href="struct_mutex.html#ad83ff6b7d8b483f91a080ae8c53a4941" title="Owner Thread pointer or NULL.">m_owner</a> = NULL;
|
|
<a name="l00260"></a>00260 <a class="code" href="group__system.html#ga5a257fa58a09815eb64a45e2dfbdc22e" title="Leaves the kernel lock mode.">chSysUnlock</a>();
|
|
<a name="l00261"></a>00261 <span class="keywordflow">return</span> ump;
|
|
<a name="l00262"></a>00262 }
|
|
<a name="l00263"></a>00263 <span class="comment"></span>
|
|
<a name="l00264"></a>00264 <span class="comment">/**</span>
|
|
<a name="l00265"></a>00265 <span class="comment"> * @brief Unlocks the next owned mutex in reverse lock order.</span>
|
|
<a name="l00266"></a>00266 <span class="comment"> * @note This function does not reschedule internally.</span>
|
|
<a name="l00267"></a>00267 <span class="comment"> *</span>
|
|
<a name="l00268"></a>00268 <span class="comment"> * @return The pointer to the unlocked mutex.</span>
|
|
<a name="l00269"></a>00269 <span class="comment"> */</span>
|
|
<a name="l00270"></a><a class="code" href="group__mutexes.html#ga705fa60fb8aa28a6632f693e83f78c96">00270</a> <a class="code" href="struct_mutex.html" title="Mutex structure.">Mutex</a> *<a class="code" href="group__mutexes.html#ga705fa60fb8aa28a6632f693e83f78c96" title="Unlocks the next owned mutex in reverse lock order.">chMtxUnlockS</a>(<span class="keywordtype">void</span>) {
|
|
<a name="l00271"></a>00271 <a class="code" href="struct_thread.html" title="Structure representing a thread.">Thread</a> *ctp = currp;
|
|
<a name="l00272"></a>00272 <a class="code" href="struct_mutex.html" title="Mutex structure.">Mutex</a> *ump, *mp;
|
|
<a name="l00273"></a>00273
|
|
<a name="l00274"></a>00274 <a class="code" href="group__debug.html#ga43d50c69eb730d0f024eb832d61f30c9" title="Condition assertion.">chDbgAssert</a>(ctp-><a class="code" href="struct_thread.html#a3ae80b4b3de4c7a23c542ca251e1f017" title="List of the mutexes owned by this thread.">p_mtxlist</a> != NULL,
|
|
<a name="l00275"></a>00275 <span class="stringliteral">"chMtxUnlockS(), #1"</span>,
|
|
<a name="l00276"></a>00276 <span class="stringliteral">"owned mutexes list empty"</span>);
|
|
<a name="l00277"></a>00277 <a class="code" href="group__debug.html#ga43d50c69eb730d0f024eb832d61f30c9" title="Condition assertion.">chDbgAssert</a>(ctp-><a class="code" href="struct_thread.html#a3ae80b4b3de4c7a23c542ca251e1f017" title="List of the mutexes owned by this thread.">p_mtxlist</a>-><a class="code" href="struct_mutex.html#ad83ff6b7d8b483f91a080ae8c53a4941" title="Owner Thread pointer or NULL.">m_owner</a> == ctp,
|
|
<a name="l00278"></a>00278 <span class="stringliteral">"chMtxUnlockS(), #2"</span>,
|
|
<a name="l00279"></a>00279 <span class="stringliteral">"ownership failure"</span>);
|
|
<a name="l00280"></a>00280
|
|
<a name="l00281"></a>00281 <span class="comment">/* Removes the top Mutex from the owned mutexes list and marks it as not</span>
|
|
<a name="l00282"></a>00282 <span class="comment"> owned.*/</span>
|
|
<a name="l00283"></a>00283 ump = ctp-><a class="code" href="struct_thread.html#a3ae80b4b3de4c7a23c542ca251e1f017" title="List of the mutexes owned by this thread.">p_mtxlist</a>;
|
|
<a name="l00284"></a>00284 ctp-><a class="code" href="struct_thread.html#a3ae80b4b3de4c7a23c542ca251e1f017" title="List of the mutexes owned by this thread.">p_mtxlist</a> = ump-><a class="code" href="struct_mutex.html#aa2113b554e5f0deefbc20dbadfd3d1dd" title="Next Mutex into an owner-list or NULL.">m_next</a>;
|
|
<a name="l00285"></a>00285 <span class="comment">/* If a thread is waiting on the mutex then the fun part begins.*/</span>
|
|
<a name="l00286"></a>00286 <span class="keywordflow">if</span> (<a class="code" href="group__mutexes.html#ga322ebcfba68cf5b66b9c315638e3ae63" title="Returns TRUE if the mutex queue contains at least a waiting thread.">chMtxQueueNotEmptyS</a>(ump)) {
|
|
<a name="l00287"></a>00287 <a class="code" href="struct_thread.html" title="Structure representing a thread.">Thread</a> *tp;
|
|
<a name="l00288"></a>00288
|
|
<a name="l00289"></a>00289 <span class="comment">/* Recalculates the optimal thread priority by scanning the owned</span>
|
|
<a name="l00290"></a>00290 <span class="comment"> mutexes list.*/</span>
|
|
<a name="l00291"></a>00291 <a class="code" href="group__types.html#ga5f2488ba73e5969cbc0f7033735374ee" title="Priority, use the fastest unsigned type.">tprio_t</a> newprio = ctp-><a class="code" href="struct_thread.html#a38de11dd7f8cdcfbc45b2c467f400fe8" title="Thread&#39;s own, non-inherited, priority.">p_realprio</a>;
|
|
<a name="l00292"></a>00292 mp = ctp-><a class="code" href="struct_thread.html#a3ae80b4b3de4c7a23c542ca251e1f017" title="List of the mutexes owned by this thread.">p_mtxlist</a>;
|
|
<a name="l00293"></a>00293 <span class="keywordflow">while</span> (mp != NULL) {
|
|
<a name="l00294"></a>00294 <span class="comment">/* If the highest priority thread waiting in the mutexes list has a</span>
|
|
<a name="l00295"></a>00295 <span class="comment"> greater priority than the current thread base priority then the final</span>
|
|
<a name="l00296"></a>00296 <span class="comment"> priority will have at least that priority.*/</span>
|
|
<a name="l00297"></a>00297 <span class="keywordflow">if</span> (<a class="code" href="group__mutexes.html#ga322ebcfba68cf5b66b9c315638e3ae63" title="Returns TRUE if the mutex queue contains at least a waiting thread.">chMtxQueueNotEmptyS</a>(mp) && (mp-><a class="code" href="struct_mutex.html#ad3efd6941b40b1415b5fe40e804d4b6f" title="Queue of the threads sleeping on this Mutex.">m_queue</a>.<a class="code" href="struct_threads_queue.html#af4a099c245d7ceecdf2f9755d05d0ed0">p_next</a>-><a class="code" href="struct_thread.html#ae60cc22956f4c19965cb94045333aa9c" title="Thread priority.">p_prio</a> > newprio))
|
|
<a name="l00298"></a>00298 newprio = mp-><a class="code" href="struct_mutex.html#ad3efd6941b40b1415b5fe40e804d4b6f" title="Queue of the threads sleeping on this Mutex.">m_queue</a>.<a class="code" href="struct_threads_queue.html#af4a099c245d7ceecdf2f9755d05d0ed0">p_next</a>-><a class="code" href="struct_thread.html#ae60cc22956f4c19965cb94045333aa9c" title="Thread priority.">p_prio</a>;
|
|
<a name="l00299"></a>00299 mp = mp-><a class="code" href="struct_mutex.html#aa2113b554e5f0deefbc20dbadfd3d1dd" title="Next Mutex into an owner-list or NULL.">m_next</a>;
|
|
<a name="l00300"></a>00300 }
|
|
<a name="l00301"></a>00301 ctp-><a class="code" href="struct_thread.html#ae60cc22956f4c19965cb94045333aa9c" title="Thread priority.">p_prio</a> = newprio;
|
|
<a name="l00302"></a>00302 <span class="comment">/* Awakens the highest priority thread waiting for the unlocked mutex and</span>
|
|
<a name="l00303"></a>00303 <span class="comment"> assigns the mutex to it.*/</span>
|
|
<a name="l00304"></a>00304 tp = <a class="code" href="group__internals.html#ga042479f09357fc59befebf4dfe0e9f4a" title="Removes the first-out Thread from a queue and returns it.">fifo_remove</a>(&ump-><a class="code" href="struct_mutex.html#ad3efd6941b40b1415b5fe40e804d4b6f" title="Queue of the threads sleeping on this Mutex.">m_queue</a>);
|
|
<a name="l00305"></a>00305 ump-><a class="code" href="struct_mutex.html#ad83ff6b7d8b483f91a080ae8c53a4941" title="Owner Thread pointer or NULL.">m_owner</a> = tp;
|
|
<a name="l00306"></a>00306 ump-><a class="code" href="struct_mutex.html#aa2113b554e5f0deefbc20dbadfd3d1dd" title="Next Mutex into an owner-list or NULL.">m_next</a> = tp-><a class="code" href="struct_thread.html#a3ae80b4b3de4c7a23c542ca251e1f017" title="List of the mutexes owned by this thread.">p_mtxlist</a>;
|
|
<a name="l00307"></a>00307 tp-><a class="code" href="struct_thread.html#a3ae80b4b3de4c7a23c542ca251e1f017" title="List of the mutexes owned by this thread.">p_mtxlist</a> = ump;
|
|
<a name="l00308"></a>00308 <a class="code" href="group__scheduler.html#ga535d58cfb3436c8d4e4586c31c062298" title="Inserts a thread in the Ready List.">chSchReadyI</a>(tp);
|
|
<a name="l00309"></a>00309 }
|
|
<a name="l00310"></a>00310 <span class="keywordflow">else</span>
|
|
<a name="l00311"></a>00311 ump-><a class="code" href="struct_mutex.html#ad83ff6b7d8b483f91a080ae8c53a4941" title="Owner Thread pointer or NULL.">m_owner</a> = NULL;
|
|
<a name="l00312"></a>00312 <span class="keywordflow">return</span> ump;
|
|
<a name="l00313"></a>00313 }
|
|
<a name="l00314"></a>00314 <span class="comment"></span>
|
|
<a name="l00315"></a>00315 <span class="comment">/**</span>
|
|
<a name="l00316"></a>00316 <span class="comment"> * @brief Unlocks all the mutexes owned by the invoking thread.</span>
|
|
<a name="l00317"></a>00317 <span class="comment"> * @details This function is <b>MUCH MORE</b> efficient than releasing the</span>
|
|
<a name="l00318"></a>00318 <span class="comment"> * mutexes one by one and not just because the call overhead,</span>
|
|
<a name="l00319"></a>00319 <span class="comment"> * this function does not have any overhead related to the priority</span>
|
|
<a name="l00320"></a>00320 <span class="comment"> * inheritance mechanism.</span>
|
|
<a name="l00321"></a>00321 <span class="comment"> */</span>
|
|
<a name="l00322"></a><a class="code" href="group__mutexes.html#ga853b4ced43d22fb5d82678dd2f0aba75">00322</a> <span class="keywordtype">void</span> <a class="code" href="group__mutexes.html#ga853b4ced43d22fb5d82678dd2f0aba75" title="Unlocks all the mutexes owned by the invoking thread.">chMtxUnlockAll</a>(<span class="keywordtype">void</span>) {
|
|
<a name="l00323"></a>00323 <a class="code" href="struct_thread.html" title="Structure representing a thread.">Thread</a> *ctp = currp;
|
|
<a name="l00324"></a>00324
|
|
<a name="l00325"></a>00325 <a class="code" href="group__system.html#ga9f6573c0763d1e4e97c63c62edad6e42" title="Enters the kernel lock mode.">chSysLock</a>();
|
|
<a name="l00326"></a>00326 <span class="keywordflow">if</span> (ctp-><a class="code" href="struct_thread.html#a3ae80b4b3de4c7a23c542ca251e1f017" title="List of the mutexes owned by this thread.">p_mtxlist</a> != NULL) {
|
|
<a name="l00327"></a>00327 <span class="keywordflow">do</span> {
|
|
<a name="l00328"></a>00328 <a class="code" href="struct_mutex.html" title="Mutex structure.">Mutex</a> *ump = ctp-><a class="code" href="struct_thread.html#a3ae80b4b3de4c7a23c542ca251e1f017" title="List of the mutexes owned by this thread.">p_mtxlist</a>;
|
|
<a name="l00329"></a>00329 ctp-><a class="code" href="struct_thread.html#a3ae80b4b3de4c7a23c542ca251e1f017" title="List of the mutexes owned by this thread.">p_mtxlist</a> = ump-><a class="code" href="struct_mutex.html#aa2113b554e5f0deefbc20dbadfd3d1dd" title="Next Mutex into an owner-list or NULL.">m_next</a>;
|
|
<a name="l00330"></a>00330 <span class="keywordflow">if</span> (<a class="code" href="group__mutexes.html#ga322ebcfba68cf5b66b9c315638e3ae63" title="Returns TRUE if the mutex queue contains at least a waiting thread.">chMtxQueueNotEmptyS</a>(ump)) {
|
|
<a name="l00331"></a>00331 <a class="code" href="struct_thread.html" title="Structure representing a thread.">Thread</a> *tp = <a class="code" href="group__internals.html#ga042479f09357fc59befebf4dfe0e9f4a" title="Removes the first-out Thread from a queue and returns it.">fifo_remove</a>(&ump-><a class="code" href="struct_mutex.html#ad3efd6941b40b1415b5fe40e804d4b6f" title="Queue of the threads sleeping on this Mutex.">m_queue</a>);
|
|
<a name="l00332"></a>00332 ump-><a class="code" href="struct_mutex.html#ad83ff6b7d8b483f91a080ae8c53a4941" title="Owner Thread pointer or NULL.">m_owner</a> = tp;
|
|
<a name="l00333"></a>00333 ump-><a class="code" href="struct_mutex.html#aa2113b554e5f0deefbc20dbadfd3d1dd" title="Next Mutex into an owner-list or NULL.">m_next</a> = tp-><a class="code" href="struct_thread.html#a3ae80b4b3de4c7a23c542ca251e1f017" title="List of the mutexes owned by this thread.">p_mtxlist</a>;
|
|
<a name="l00334"></a>00334 tp-><a class="code" href="struct_thread.html#a3ae80b4b3de4c7a23c542ca251e1f017" title="List of the mutexes owned by this thread.">p_mtxlist</a> = ump;
|
|
<a name="l00335"></a>00335 <a class="code" href="group__scheduler.html#ga535d58cfb3436c8d4e4586c31c062298" title="Inserts a thread in the Ready List.">chSchReadyI</a>(tp);
|
|
<a name="l00336"></a>00336 }
|
|
<a name="l00337"></a>00337 <span class="keywordflow">else</span>
|
|
<a name="l00338"></a>00338 ump-><a class="code" href="struct_mutex.html#ad83ff6b7d8b483f91a080ae8c53a4941" title="Owner Thread pointer or NULL.">m_owner</a> = NULL;
|
|
<a name="l00339"></a>00339 } <span class="keywordflow">while</span> (ctp-><a class="code" href="struct_thread.html#a3ae80b4b3de4c7a23c542ca251e1f017" title="List of the mutexes owned by this thread.">p_mtxlist</a> != NULL);
|
|
<a name="l00340"></a>00340 ctp-><a class="code" href="struct_thread.html#ae60cc22956f4c19965cb94045333aa9c" title="Thread priority.">p_prio</a> = ctp-><a class="code" href="struct_thread.html#a38de11dd7f8cdcfbc45b2c467f400fe8" title="Thread&#39;s own, non-inherited, priority.">p_realprio</a>;
|
|
<a name="l00341"></a>00341 <a class="code" href="group__scheduler.html#ga4e38b4bee3d2330f6a0f1cdb7660af20" title="Performs a reschedule if a higher priority thread is runnable.">chSchRescheduleS</a>();
|
|
<a name="l00342"></a>00342 }
|
|
<a name="l00343"></a>00343 <a class="code" href="group__system.html#ga5a257fa58a09815eb64a45e2dfbdc22e" title="Leaves the kernel lock mode.">chSysUnlock</a>();
|
|
<a name="l00344"></a>00344 }
|
|
<a name="l00345"></a>00345
|
|
<a name="l00346"></a>00346 <span class="preprocessor">#endif </span><span class="comment">/* CH_USE_MUTEXES */</span>
|
|
<a name="l00347"></a>00347 <span class="comment"></span>
|
|
<a name="l00348"></a>00348 <span class="comment">/** @} */</span>
|
|
</pre></div></div>
|
|
</div>
|
|
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|
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