?? int16u ossemaccept.htm
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<div class=Section1><b><span lang=EN-US style='font-size:14.0pt;mso-bidi-font-size:
9.0pt;font-family:"Times New Roman";mso-fareast-font-family:宋體;mso-font-kerning:
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</span></b>
<h1><span lang=EN-US style='font-size:14.0pt;mso-bidi-font-size:9.0pt'>INT16U
OSSemAccept(OS_EVENT *pevent);<o:p></o:p></span></h1>
<p class=Descript><span class=CodeInText><span lang=EN-US style='font-size:
12.0pt;font-family:"Courier New"'>OSSemAccept()</span></span><span lang=EN-US>
allows you to check to see if a resource is available or an event
occurred.<span style="mso-spacerun: yes"> </span>Unlike </span><span
class=CodeInText><span lang=EN-US style='font-size:12.0pt;font-family:"Courier New"'>OSSemPend()</span></span><span
lang=EN-US>, </span><span class=CodeInText><span lang=EN-US style='font-size:
12.0pt;font-family:"Courier New"'>OSSemAccept()</span></span><span lang=EN-US>
does not suspend the calling task if the resource is not available.<span
style="mso-spacerun: yes"> </span>You would use </span><span
class=CodeInText><span lang=EN-US style='font-size:12.0pt;font-family:"Courier New"'>OSSemAccept()</span></span><span
lang=EN-US> from an ISR to obtain the semaphore.</span></p>
<p class=NewSectionPara><span lang=EN-US><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></p>
<p class=NewSectionPara><b><span lang=EN-US>Arguments<o:p></o:p></span></b></p>
<p class=Descript><b><span lang=EN-US style='font-family:"Courier New"'>pevent</span></b><span
lang=EN-US> is a pointer to the semaphore that guards the resource.<span
style="mso-spacerun: yes"> </span>This pointer is returned to your
application when the semaphore is created (see </span><b><span lang=EN-US
style='font-family:"Courier New"'>OSSemCreate()</span></b><span lang=EN-US>).</span></p>
<p class=NewSectionPara><span lang=EN-US><span style='mso-tab-count:1'> </span></span></p>
<p class=NewSectionPara><b><span lang=EN-US>Returned Value<o:p></o:p></span></b></p>
<p class=Descript><span lang=EN-US>When the semaphore value is greater than 0
when OSSemAccept() is called then, the semaphore value is decremented and the
value of the semaphore before the decrement is returned to your
application.<span style="mso-spacerun: yes"> </span>If, however, the
semaphore value is 0 then, the resource is not available and 0 is returned to
your application.</span></p>
<p class=NewSectionPara><span lang=EN-US><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></p>
<p class=NewSectionPara><b><span lang=EN-US>Notes/Warnings<o:p></o:p></span></b></p>
<p class=Descript><span lang=EN-US>Semaphores must be created before they are
used.</span></p>
<p class=NewSectionPara><span lang=EN-US><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></p>
<p class=NewSectionPara><b><span lang=EN-US>Example<o:p></o:p></span></b></p>
<div style='border:solid #999999 1.5pt;padding:1.0pt 1.0pt 15.0pt 1.0pt;
background:#F2F2F2;mso-shading:windowtext;mso-pattern:gray-5 auto'>
<p class=CodeSeg style='border:none;mso-border-alt:solid #999999 1.5pt;
padding:0cm;mso-padding-alt:1.0pt 1.0pt 15.0pt 1.0pt'><span lang=EN-US><span
style='mso-tab-count:1'> </span>OS_EVENT *DispSem;</span></p>
<p class=CodeSeg style='border:none;mso-border-alt:solid #999999 1.5pt;
padding:0cm;mso-padding-alt:1.0pt 1.0pt 15.0pt 1.0pt'><span lang=EN-US><span
style='mso-tab-count:1'> </span>void Task (void *pdata)</span></p>
<p class=CodeSeg style='border:none;mso-border-alt:solid #999999 1.5pt;
padding:0cm;mso-padding-alt:1.0pt 1.0pt 15.0pt 1.0pt'><span lang=EN-US><span
style='mso-tab-count:1'> </span>{</span></p>
<p class=CodeSeg style='border:none;mso-border-alt:solid #999999 1.5pt;
padding:0cm;mso-padding-alt:1.0pt 1.0pt 15.0pt 1.0pt'><span lang=EN-US><span
style="mso-spacerun: yes"> </span>INT16U value;</span></p>
<p class=CodeSeg style='border:none;mso-border-alt:solid #999999 1.5pt;
padding:0cm;mso-padding-alt:1.0pt 1.0pt 15.0pt 1.0pt'><span lang=EN-US><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></p>
<p class=CodeSeg style='border:none;mso-border-alt:solid #999999 1.5pt;
padding:0cm;mso-padding-alt:1.0pt 1.0pt 15.0pt 1.0pt'><span lang=EN-US><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></p>
<p class=CodeSeg style='border:none;mso-border-alt:solid #999999 1.5pt;
padding:0cm;mso-padding-alt:1.0pt 1.0pt 15.0pt 1.0pt'><span lang=EN-US><span
style="mso-spacerun: yes"> </span>pdata = pdata;</span></p>
<p class=CodeSeg style='border:none;mso-border-alt:solid #999999 1.5pt;
padding:0cm;mso-padding-alt:1.0pt 1.0pt 15.0pt 1.0pt'><span lang=EN-US><span
style="mso-spacerun: yes"> </span>for (;;) {</span></p>
<p class=CodeSeg style='border:none;mso-border-alt:solid #999999 1.5pt;
padding:0cm;mso-padding-alt:1.0pt 1.0pt 15.0pt 1.0pt'><span lang=EN-US><span
style="mso-spacerun: yes">
</span>value = OSSemAccept(DispSem); /* Check resource availability */</span></p>
<p class=CodeSeg style='border:none;mso-border-alt:solid #999999 1.5pt;
padding:0cm;mso-padding-alt:1.0pt 1.0pt 15.0pt 1.0pt'><span lang=EN-US><span
style="mso-spacerun: yes">
</span>if (value > 0) {</span></p>
<p class=CodeSeg style='border:none;mso-border-alt:solid #999999 1.5pt;
padding:0cm;mso-padding-alt:1.0pt 1.0pt 15.0pt 1.0pt'><span lang=EN-US><span
style="mso-spacerun:
yes">
</span>.<span style="mso-spacerun:
yes">
</span>/* Resource available, process */</span></p>
<p class=CodeSeg style='border:none;mso-border-alt:solid #999999 1.5pt;
padding:0cm;mso-padding-alt:1.0pt 1.0pt 15.0pt 1.0pt'><span lang=EN-US><span
style="mso-spacerun:
yes">
</span>.</span></p>
<p class=CodeSeg style='border:none;mso-border-alt:solid #999999 1.5pt;
padding:0cm;mso-padding-alt:1.0pt 1.0pt 15.0pt 1.0pt'><span lang=EN-US><span
style="mso-spacerun: yes">
</span>} </span></p>
<p class=CodeSeg style='border:none;mso-border-alt:solid #999999 1.5pt;
padding:0cm;mso-padding-alt:1.0pt 1.0pt 15.0pt 1.0pt'><span lang=EN-US><span
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</span>.</span></p>
<p class=CodeSeg style='border:none;mso-border-alt:solid #999999 1.5pt;
padding:0cm;mso-padding-alt:1.0pt 1.0pt 15.0pt 1.0pt'><span lang=EN-US><span
style="mso-spacerun: yes">
</span>.</span></p>
<p class=CodeSeg style='border:none;mso-border-alt:solid #999999 1.5pt;
padding:0cm;mso-padding-alt:1.0pt 1.0pt 15.0pt 1.0pt'><span lang=EN-US><span
style="mso-spacerun: yes"> </span>}</span></p>
<p class=CodeSeg style='border:none;mso-border-alt:solid #999999 1.5pt;
padding:0cm;mso-padding-alt:1.0pt 1.0pt 15.0pt 1.0pt'><span lang=EN-US><span
style='mso-tab-count:1'> </span>}</span></p>
</div>
<p class=Code><span lang=EN-US style='font-size:9.0pt'><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></p>
<p class=Code><span lang=EN-US style='font-size:9.0pt'><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></p>
</div>
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style='page-break-before:always;mso-break-type:section-break'>
</span>
<div class=Section2 style='layout-grid:15.6pt'>
<p class=MsoNormal><span lang=EN-US><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></p>
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