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<td style="width: 80px;"><img alt="ChibiOS/RT Logo" src="logo_small.png"></td>
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<td><big><big>ChibiOS/RT</big></big><br><br>Architecture - Reference Manual - Guides</td>
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<h1>chsem.h</h1> </div>
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<a href="chsem_8h.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 chsem.h</span>
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<a name="l00029"></a>00029 <span class="comment"> * @brief Semaphores macros and structures.</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 semaphores</span>
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<a name="l00032"></a>00032 <span class="comment"> * @{</span>
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<a name="l00033"></a>00033 <span class="comment"> */</span>
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<a name="l00034"></a>00034
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<a name="l00035"></a>00035 <span class="preprocessor">#ifndef _CHSEM_H_</span>
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<a name="l00036"></a>00036 <span class="preprocessor"></span><span class="preprocessor">#define _CHSEM_H_</span>
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<a name="l00037"></a>00037 <span class="preprocessor"></span>
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<a name="l00038"></a>00038 <span class="preprocessor">#if CH_USE_SEMAPHORES</span>
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<a name="l00039"></a>00039 <span class="preprocessor"></span><span class="comment"></span>
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<a name="l00040"></a>00040 <span class="comment">/**</span>
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<a name="l00041"></a>00041 <span class="comment"> * @brief Semaphore structure.</span>
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<a name="l00042"></a>00042 <span class="comment"> */</span>
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<a name="l00043"></a><a class="code" href="struct_semaphore.html">00043</a> <span class="keyword">typedef</span> <span class="keyword">struct </span><a class="code" href="struct_semaphore.html" title="Semaphore structure.">Semaphore</a> {
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<a name="l00044"></a><a class="code" href="struct_semaphore.html#a26051a38c22dc11a7a2bf37496d8e906">00044</a> <a class="code" href="struct_threads_queue.html" title="Generic threads bidirectional linked list header and element.">ThreadsQueue</a> <a class="code" href="struct_semaphore.html#a26051a38c22dc11a7a2bf37496d8e906" title="Queue of the threads sleeping on this semaphore.">s_queue</a>; <span class="comment">/**< @brief Queue of the threads sleeping</span>
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<a name="l00045"></a>00045 <span class="comment"> on this semaphore. */</span>
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<a name="l00046"></a><a class="code" href="struct_semaphore.html#ae42955cd2346167681e0fd6a136369cd">00046</a> <a class="code" href="group__types.html#ga090b3bab5602157ebf706a44041dc05e" title="Counter, recommended fastest signed.">cnt_t</a> <a class="code" href="struct_semaphore.html#ae42955cd2346167681e0fd6a136369cd" title="The semaphore counter.">s_cnt</a>; <span class="comment">/**< @brief The semaphore counter. */</span>
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<a name="l00047"></a>00047 } <a class="code" href="struct_semaphore.html" title="Semaphore structure.">Semaphore</a>;
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<a name="l00048"></a>00048
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<a name="l00049"></a>00049 <span class="preprocessor">#ifdef __cplusplus</span>
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<a name="l00050"></a>00050 <span class="preprocessor"></span><span class="keyword">extern</span> <span class="stringliteral">"C"</span> {
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<a name="l00051"></a>00051 <span class="preprocessor">#endif</span>
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<a name="l00052"></a>00052 <span class="preprocessor"></span> <span class="keywordtype">void</span> <a class="code" href="group__semaphores.html#gafe8fc6155a871074e8017efd908b2c58" title="Initializes a semaphore with the specified counter value.">chSemInit</a>(<a class="code" href="struct_semaphore.html" title="Semaphore structure.">Semaphore</a> *sp, <a class="code" href="group__types.html#ga090b3bab5602157ebf706a44041dc05e" title="Counter, recommended fastest signed.">cnt_t</a> n);
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<a name="l00053"></a>00053 <span class="keywordtype">void</span> <a class="code" href="group__semaphores.html#ga58e266e609cfd3dbc67f299b3ae9debb" title="Performs a reset operation on the semaphore.">chSemReset</a>(<a class="code" href="struct_semaphore.html" title="Semaphore structure.">Semaphore</a> *sp, <a class="code" href="group__types.html#ga090b3bab5602157ebf706a44041dc05e" title="Counter, recommended fastest signed.">cnt_t</a> n);
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<a name="l00054"></a>00054 <span class="keywordtype">void</span> <a class="code" href="group__semaphores.html#gae7972b6b22b80ac09bac5a186277ab81" title="Performs a reset operation on the semaphore.">chSemResetI</a>(<a class="code" href="struct_semaphore.html" title="Semaphore structure.">Semaphore</a> *sp, <a class="code" href="group__types.html#ga090b3bab5602157ebf706a44041dc05e" title="Counter, recommended fastest signed.">cnt_t</a> n);
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<a name="l00055"></a>00055 <a class="code" href="group__types.html#ga35bcb0c321cd7bc45bf1a11fa17ebdd3" title="Message, use signed pointer equivalent.">msg_t</a> <a class="code" href="group__semaphores.html#gabc8f7e509870e9b0527a6a68fad71425" title="Performs a wait operation on a semaphore.">chSemWait</a>(<a class="code" href="struct_semaphore.html" title="Semaphore structure.">Semaphore</a> *sp);
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<a name="l00056"></a>00056 <a class="code" href="group__types.html#ga35bcb0c321cd7bc45bf1a11fa17ebdd3" title="Message, use signed pointer equivalent.">msg_t</a> <a class="code" href="group__semaphores.html#gaa2c0367078533e291d2e889e251d8b67" title="Performs a wait operation on a semaphore.">chSemWaitS</a>(<a class="code" href="struct_semaphore.html" title="Semaphore structure.">Semaphore</a> *sp);
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<a name="l00057"></a>00057 <a class="code" href="group__types.html#ga35bcb0c321cd7bc45bf1a11fa17ebdd3" title="Message, use signed pointer equivalent.">msg_t</a> <a class="code" href="group__semaphores.html#ga0bc227311e5be3e3b6e3aee6a68169da" title="Performs a wait operation on a semaphore with timeout specification.">chSemWaitTimeout</a>(<a class="code" href="struct_semaphore.html" title="Semaphore structure.">Semaphore</a> *sp, <a class="code" href="group__types.html#gae3e32a98d431a02106616da3071832dd" title="System Time, recommended fastest unsigned.">systime_t</a> time);
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<a name="l00058"></a>00058 <a class="code" href="group__types.html#ga35bcb0c321cd7bc45bf1a11fa17ebdd3" title="Message, use signed pointer equivalent.">msg_t</a> <a class="code" href="group__semaphores.html#ga924ec5d191bb8debe8727ae4dd5d6d03" title="Performs a wait operation on a semaphore with timeout specification.">chSemWaitTimeoutS</a>(<a class="code" href="struct_semaphore.html" title="Semaphore structure.">Semaphore</a> *sp, <a class="code" href="group__types.html#gae3e32a98d431a02106616da3071832dd" title="System Time, recommended fastest unsigned.">systime_t</a> time);
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<a name="l00059"></a>00059 <span class="keywordtype">void</span> <a class="code" href="group__semaphores.html#ga7ec0cbda23e49e2370e0b91f20baf05e" title="Performs a signal operation on a semaphore.">chSemSignal</a>(<a class="code" href="struct_semaphore.html" title="Semaphore structure.">Semaphore</a> *sp);
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<a name="l00060"></a>00060 <span class="keywordtype">void</span> <a class="code" href="group__semaphores.html#gaca0b70cf495a9cb7569e1cf5b07e2b3d" title="Performs a signal operation on a semaphore.">chSemSignalI</a>(<a class="code" href="struct_semaphore.html" title="Semaphore structure.">Semaphore</a> *sp);
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<a name="l00061"></a>00061 <span class="preprocessor">#if CH_USE_SEMSW</span>
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<a name="l00062"></a>00062 <span class="preprocessor"></span> <a class="code" href="group__types.html#ga35bcb0c321cd7bc45bf1a11fa17ebdd3" title="Message, use signed pointer equivalent.">msg_t</a> <a class="code" href="group__semaphores.html#ga0dc7b4339506de346d67b4560b271e44" title="Performs atomic signal and wait operations on two semaphores.">chSemSignalWait</a>(<a class="code" href="struct_semaphore.html" title="Semaphore structure.">Semaphore</a> *sps, <a class="code" href="struct_semaphore.html" title="Semaphore structure.">Semaphore</a> *spw);
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<a name="l00063"></a>00063 <span class="preprocessor">#endif</span>
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<a name="l00064"></a>00064 <span class="preprocessor"></span><span class="preprocessor">#ifdef __cplusplus</span>
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<a name="l00065"></a>00065 <span class="preprocessor"></span>}
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<a name="l00066"></a>00066 <span class="preprocessor">#endif</span>
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<a name="l00067"></a>00067 <span class="preprocessor"></span><span class="comment"></span>
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<a name="l00068"></a>00068 <span class="comment">/**</span>
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<a name="l00069"></a>00069 <span class="comment"> * @brief Data part of a static semaphore initializer.</span>
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<a name="l00070"></a>00070 <span class="comment"> * @details This macro should be used when statically initializing a semaphore</span>
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<a name="l00071"></a>00071 <span class="comment"> * that is part of a bigger structure.</span>
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<a name="l00072"></a>00072 <span class="comment"> *</span>
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<a name="l00073"></a>00073 <span class="comment"> * @param[in] name the name of the semaphore variable</span>
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<a name="l00074"></a>00074 <span class="comment"> * @param[in] n the counter initial value, this value must be</span>
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<a name="l00075"></a>00075 <span class="comment"> * non-negative</span>
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<a name="l00076"></a>00076 <span class="comment"> */</span>
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<a name="l00077"></a><a class="code" href="group__semaphores.html#ga1100c867cc8bd8328f7a7db5e7c74f6d">00077</a> <span class="preprocessor">#define _SEMAPHORE_DATA(name, n) {_THREADSQUEUE_DATA(name.s_queue), n}</span>
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<a name="l00078"></a>00078 <span class="preprocessor"></span><span class="comment"></span>
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<a name="l00079"></a>00079 <span class="comment">/**</span>
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<a name="l00080"></a>00080 <span class="comment"> * @brief Static semaphore initializer.</span>
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<a name="l00081"></a>00081 <span class="comment"> * @details Statically initialized semaphores require no explicit</span>
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<a name="l00082"></a>00082 <span class="comment"> * initialization using @p chSemInit().</span>
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<a name="l00083"></a>00083 <span class="comment"> *</span>
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<a name="l00084"></a>00084 <span class="comment"> * @param[in] name the name of the semaphore variable</span>
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<a name="l00085"></a>00085 <span class="comment"> * @param[in] n the counter initial value, this value must be</span>
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<a name="l00086"></a>00086 <span class="comment"> * non-negative</span>
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<a name="l00087"></a>00087 <span class="comment"> */</span>
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<a name="l00088"></a><a class="code" href="group__semaphores.html#gac09ac6a24cd3dbe91ac13d72bebf67c1">00088</a> <span class="preprocessor">#define SEMAPHORE_DECL(name, n) Semaphore name = _SEMAPHORE_DATA(name, n)</span>
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<a name="l00089"></a>00089 <span class="preprocessor"></span><span class="comment"></span>
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<a name="l00090"></a>00090 <span class="comment">/**</span>
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<a name="l00091"></a>00091 <span class="comment"> * @brief Decreases the semaphore counter.</span>
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<a name="l00092"></a>00092 <span class="comment"> * @details This macro can be used when the counter is known to be positive.</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__semaphores.html#ga748b56bc2be187e316496d7b6e748f89">00094</a> <span class="preprocessor">#define chSemFastWaitI(sp) ((sp)->s_cnt--)</span>
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<a name="l00095"></a>00095 <span class="preprocessor"></span><span class="comment"></span>
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<a name="l00096"></a>00096 <span class="comment">/**</span>
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<a name="l00097"></a>00097 <span class="comment"> * @brief Increases the semaphore counter.</span>
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<a name="l00098"></a>00098 <span class="comment"> * @details This macro can be used when the counter is known to be not negative.</span>
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<a name="l00099"></a>00099 <span class="comment"> */</span>
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<a name="l00100"></a><a class="code" href="group__semaphores.html#gacb89a28bd1fff2704207423f350215ba">00100</a> <span class="preprocessor">#define chSemFastSignalI(sp) ((sp)->s_cnt++)</span>
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<a name="l00101"></a>00101 <span class="preprocessor"></span><span class="comment"></span>
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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"> * @brief Returns the semaphore counter current value.</span>
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<a name="l00104"></a>00104 <span class="comment"> */</span>
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<a name="l00105"></a><a class="code" href="group__semaphores.html#gadab3ccf8a34988ef6d410354b2648327">00105</a> <span class="preprocessor">#define chSemGetCounterI(sp) ((sp)->s_cnt)</span>
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<a name="l00106"></a>00106 <span class="preprocessor"></span>
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<a name="l00107"></a>00107 <span class="preprocessor">#endif </span><span class="comment">/* CH_USE_SEMAPHORES */</span>
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<a name="l00108"></a>00108
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<a name="l00109"></a>00109 <span class="preprocessor">#endif </span><span class="comment">/* _CHSEM_H_ */</span>
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<a name="l00110"></a>00110 <span class="comment"></span>
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<a name="l00111"></a>00111 <span class="comment">/** @} */</span>
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</pre></div></div>
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