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<h2>
<a name="1204424"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">2.1 Building for OS20</font>
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<p>
<a name="1207119"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Normally using OS20 can be almost transparent. All that is necessary is to specify to the linker that the OS20 runtime system is to be used using the <font size=2 face=Courier><strong>runtime</strong></font> option. For example:</font>
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<a name="1207123"> </a><font size=2 face=Courier><strong>st20cc -p STi5516MB382 -runtime os20 app.tco -o system.lku<br></strong></font>
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<a name="1207124"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">This ensures that by the time the user's <font size=2 face=Courier><strong>main</strong></font> function starts executing:</font>
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<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1204437"> </a>the OS20 scheduler has been initialized and started,</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1204438"> </a>the interrupt controller has been initialized,</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1204439"> </a>the system and internal partitions have been initialized,</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1204440"> </a>thread safe versions of <font size=2 face=Courier><strong>malloc</strong></font> and <font size=2 face=Courier><strong>free</strong></font> have been set up,</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1204441"> </a>protection has been installed to ensure that when multiple threads call debug functions, device-independent I/O functions or <font size=2 face=Courier><strong>stdio</strong></font> functions concurrently, all operations are handled correctly.</font></p>
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<a name="1204445"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><strong>st20cc</strong> is described in the <em>ST20 Embedded Toolset User Manual</em>, chapter⌨️ 快捷键说明
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