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<title>C.4 Incompatible changes</title>
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<a name="1142989"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">C.4 Incompatible changes</font>
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<a name="1142990"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">A few changes have been made to some library functions, which may break existing code, and require source code to be compiled again or modified:</font>
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<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1142991"> </a>If your code explicitly uses the file descriptors <font size=2 face=Courier><strong>stdout</strong></font> or <font size=2 face=Courier><strong>stderr</strong></font>, then the code will have to be compiled again.</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1142992"> </a>The interface to the callback function used to protect <strong>debug*()</strong> functions from re-entrancy by multiple threads has changed. In previous versions the interface was:</font></p>
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<dt> <a name="1142993"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><font size=2 face=Courier><strong>long int debugmutexfn(debugmutexop);</strong></font></font>
<dt> <a name="1142994"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">However from release R1.7 this was changed to:</font>
<dt> <a name="1142995"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><font size=2 face=Courier><strong>long int debugmutexfn(debugmutexop, void*);<br>#pragma ST_nolink(debugmutexfn)</strong></font></font>
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<a name="1142996"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">The new second parameter to the callback function is set by the user using an extra parameter which has been added to <font size=2 face=Courier><strong>debugsetmutexfn()</strong></font>.</font>
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<a name="1142997"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">This <font size=2 face=Courier><strong>debugmutexfn</strong></font> has no access to global data, so if access to static data is required within <font size=2 face=Courier><strong>debugmutexfn</strong></font> then the static link (also known as GSB) must be supplied via the user data parameter. For an example of this see the OS20 source file <font size=2 face=Courier><strong>$ST20ROOT/src/os20/clib/debprot.c</strong></font>.</font>
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