ARM-software
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<title>CMSIS-RTOS: Inter-Thread Communication and Resource Sharing</title>
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   <div id="projectname">CMSIS-RTOS
   &#160;<span id="projectnumber">Version 1.03</span>
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   <div id="projectbrief">Real-Time Operating System: API and RTX Reference Implementation.</div>
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<div class="title">Inter-Thread Communication and Resource Sharing<div class="ingroups"><a class="el" href="group__CMSIS__RTOS.html">CMSIS-RTOS API</a></div></div>  </div>
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<p>Functions for inter-thread communication.  
<a href="#details">More...</a></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="groups"></a>
Content</h2></td></tr>
<tr class="memitem:group__CMSIS__RTOS__SignalMgmt"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__SignalMgmt.html">Signal Events</a></td></tr>
<tr class="memdesc:group__CMSIS__RTOS__SignalMgmt"><td class="mdescLeft">&#160;</td><td class="mdescRight">Synchronize threads using signals. <br/></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:group__CMSIS__RTOS__Message"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__Message.html">Message Queue</a></td></tr>
<tr class="memdesc:group__CMSIS__RTOS__Message"><td class="mdescLeft">&#160;</td><td class="mdescRight">Exchange messages between threads in a FIFO-like operation. <br/></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:group__CMSIS__RTOS__PoolMgmt"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__PoolMgmt.html">Memory Pool</a></td></tr>
<tr class="memdesc:group__CMSIS__RTOS__PoolMgmt"><td class="mdescLeft">&#160;</td><td class="mdescRight">Manage thread-safe fixed-size blocks of dynamic memory. <br/></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:group__CMSIS__RTOS__Mail"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__Mail.html">Mail Queue</a></td></tr>
<tr class="memdesc:group__CMSIS__RTOS__Mail"><td class="mdescLeft">&#160;</td><td class="mdescRight">Exchange data between threads using a queue of memory blocks. <br/></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:group__CMSIS__RTOS__MutexMgmt"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__MutexMgmt.html">Mutexes</a></td></tr>
<tr class="memdesc:group__CMSIS__RTOS__MutexMgmt"><td class="mdescLeft">&#160;</td><td class="mdescRight">Synchronize resource access using Mutual Exclusion (Mutex). <br/></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:group__CMSIS__RTOS__SemaphoreMgmt"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__SemaphoreMgmt.html">Semaphores</a></td></tr>
<tr class="memdesc:group__CMSIS__RTOS__SemaphoreMgmt"><td class="mdescLeft">&#160;</td><td class="mdescRight">Access shared resources simultaneously from different threads. <br/></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Description</h2>
<p>In most applications, threads need to <b>communicate</b> <b>with</b> <b>each</b> <b>other</b> or <b>access</b> <b>shared</b> <b>resources</b> together. There are many ways to exchange data between threads, for example using shared data, polling loops and message passing.</p>
<p>Many resources in a microcontroller can be considered as <b>serially-reusable</b>. This means that they can be used repeatedly by different threads, but only by <b>one</b> <b>thread</b> <b>at</b> <b>a</b> <b>time</b> (for example communication peripherals such as <b>UARTs</b>, <b>memory</b>, and <b>files</b> that need to be modified).</p>
<p>The CMSIS-RTOS API provides different means to pass messages between threads to make inter-thread communication more efficient. Also, resource sharing is inherently supported. The following methods are available to the user: </p>
<h2>Inter-Thread Communication </h2>
<ul>
<li><a class="el" href="group__CMSIS__RTOS__SignalMgmt.html">Signal Events</a></li>
<li><a class="el" href="group__CMSIS__RTOS__Message.html">Message Queue</a></li>
<li><a class="el" href="group__CMSIS__RTOS__PoolMgmt.html">Memory Pool</a></li>
<li><a class="el" href="group__CMSIS__RTOS__Mail.html">Mail Queue</a></li>
</ul>
<h2>Resource Sharing </h2>
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<li><a class="el" href="group__CMSIS__RTOS__MutexMgmt.html">Mutexes</a></li>
<li><a class="el" href="group__CMSIS__RTOS__SemaphoreMgmt.html">Semaphores</a> </li>
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