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<title>CMSIS-RTOS: Inter-Thread Communication and Resource Sharing</title>
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<div id="projectname">CMSIS-RTOS
 <span id="projectnumber">Version 1.02</span>
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<div id="projectbrief">CMSIS-RTOS API: Generic RTOS interface for Cortex-M processor-based devices.</div>
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<div class="title">Inter-Thread Communication and Resource Sharing</div> </div>
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<p>Functions for inter-thread communication.
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<tr class="memitem:group___c_m_s_i_s___r_t_o_s___signal_mgmt"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___c_m_s_i_s___r_t_o_s___signal_mgmt.html">Signal Events</a></td></tr>
<tr class="memdesc:group___c_m_s_i_s___r_t_o_s___signal_mgmt"><td class="mdescLeft"> </td><td class="mdescRight">Synchronize threads using signals. <br/></td></tr>
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<tr class="memitem:group___c_m_s_i_s___r_t_o_s___message"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___c_m_s_i_s___r_t_o_s___message.html">Message Queue</a></td></tr>
<tr class="memdesc:group___c_m_s_i_s___r_t_o_s___message"><td class="mdescLeft"> </td><td class="mdescRight">Exchange messages between threads in a FIFO-like operation. <br/></td></tr>
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<tr class="memitem:group___c_m_s_i_s___r_t_o_s___pool_mgmt"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___c_m_s_i_s___r_t_o_s___pool_mgmt.html">Memory Pool</a></td></tr>
<tr class="memdesc:group___c_m_s_i_s___r_t_o_s___pool_mgmt"><td class="mdescLeft"> </td><td class="mdescRight">Manage thread-safe fixed-size blocks of dynamic memory. <br/></td></tr>
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<tr class="memdesc:group___c_m_s_i_s___r_t_o_s___mail"><td class="mdescLeft"> </td><td class="mdescRight">Exchange data between threads using a queue of memory blocks. <br/></td></tr>
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<tr class="memitem:group___c_m_s_i_s___r_t_o_s___mutex_mgmt"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___c_m_s_i_s___r_t_o_s___mutex_mgmt.html">Mutexes</a></td></tr>
<tr class="memdesc:group___c_m_s_i_s___r_t_o_s___mutex_mgmt"><td class="mdescLeft"> </td><td class="mdescRight">Synchronize resource access using Mutual Exclusion (Mutex). <br/></td></tr>
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<tr class="memdesc:group___c_m_s_i_s___r_t_o_s___semaphore_mgmt"><td class="mdescLeft"> </td><td class="mdescRight">Access shared resources simultaneously from different threads. <br/></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>
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<h2>Resource Sharing</h2>
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<li><a class="el" href="group___c_m_s_i_s___r_t_o_s___mutex_mgmt.html">Mutexes</a></li>
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