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<title>Technical Data</title>
<title>CMSIS-RTOS: Technical Data</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="textblock"><p>This section lists the technical data of CMSIS-RTOS RTX.</p>
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<th>Description </th><th><p class="starttd">Limitations </p>
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<td>Defined Tasks </td><td><p class="starttd">Unlimited </p>
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<td>Active Threads </td><td><p class="starttd">250 max </p>
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<td>Mailboxes </td><td><p class="starttd">Unlimited </p>
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<td>Semaphores </td><td><p class="starttd">Unlimited </p>
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<td>Mutexes </td><td><p class="starttd">Unlimited </p>
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<td>Signals </td><td><p class="starttd">16 per thread </p>
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<td>Timer Callbacks </td><td><p class="starttd">Unlimited </p>
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<td>Code Space </td><td><p class="starttd">&lt; 5.0 Kbytes </p>
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<td>RAM Space for Kernel </td><td><p class="starttd">300 bytes + 128 bytes Main Stack </p>
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<td>RAM Space for a Thread </td><td><p class="starttd">StackSize + 52 bytes </p>
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<td>RAM Space for a Mailbox </td><td><p class="starttd">MaxMessages * 4 + 16 bytes </p>
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<td>RAM Space for a Semaphore </td><td><p class="starttd">8 bytes </p>
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<td>RAM Space for a Mutex </td><td><p class="starttd">12 bytes </p>
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<td>RAM Space for a User Timer </td><td><p class="starttd">24 bytes </p>
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<td>Hardware Requirements </td><td><p class="starttd">SysTick timer or other hardware timer </p>
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<td>Thread context switch time </td><td><p class="starttd">&lt; 2.6 usec @ 72 MHz </p>
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<td>Interrupt lockout time </td><td>Not disabled </td></tr>
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<dl class="section note"><dt>Note</dt><dd><ul>
<li>Unlimited means that the RTX kernel does not impose any limitations on the number. However, the available system memory resources limit the number of items you can create.</li>
<li>RAM requirements depend on the number of concurrently running threads.</li>
<li>The code and RAM size is calculated for ARMCC Compiler when using the <b>MicroLib</b> runtime library.</li>
</ul>
</dd></dl>
<h1><a class="anchor" id="osWait"></a>
osWait</h1>
<p>The generic wait function <b>osWait</b> is currently not supported by CMSIS-RTOS RTX. </p>
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