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<h2>
<a name="1204546"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">15.3 Compilation option file: conf.h</font>
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<p>
<a name="1204550"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">The <font size=2 face=Courier><strong>conf.h</strong></font> header file is included by every source file in OS20 and is used to set the compile time options. It is located in <font size=2 face=Courier><strong>$ST20ROOT/src/os20/include/conf.h</strong></font>. Every compile time option is listed in this file together with a brief description. Most options (such as silicon workarounds) are fully described in <font size=2 face=Courier><strong>conf.h</strong></font> and are not mentioned in this document. There are some options that require additional explanation; these are listed in the following section.</font>
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<h3>
<a name="1204553"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">15.3.1 Callback Support</font>
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<a name="1204554"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Callback support is enabled using the option <font size=2 face=Courier><strong>CONF_CALLBACK_SUPPORT</strong></font>. This causes OS20 to call a user-supplied callback function whenever certain scheduler or interrupt events take place.</font>
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<a name="1204558"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">The following events can have a callback function attached to them:</font>
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<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1204559"> </a>a task switch,</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1204560"> </a>when a task is initialized with <font size=2 face=Courier><strong>task_init</strong></font>,</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1204561"> </a>when a task exits,</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1204562"> </a>when a task is deleted with <font size=2 face=Courier><strong>task_delete</strong></font>,</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1204563"> </a>whenever a high priority process is removed from the scheduler queue (deschedules waiting for some event),</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1204564"> </a>whenever a high priority process is added to the scheduler queue (rescheduled after an event occurred),</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1204565"> </a>when an interrupt handler is installed with <font size=2 face=Courier><strong>interrupt_install</strong></font>,</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1204566"> </a>when an interrupt handler is removed with <font size=2 face=Courier><strong>interrupt_delete</strong></font>,</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1204567"> </a>when an interrupt handler is entered,</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1204568"> </a>when an interrupt handler exits.</font></p>
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<p>
<a name="1204572"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">The callback setup functions are described in <a href="libs.htm#1214476"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>Chapter⌨️ 快捷键说明
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