ch05.5.htm

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML EXPERIMENTAL 970324//EN"><HTML><HEAD><META NAME="GENERATOR" CONTENT="Adobe FrameMaker 5.5/HTML Export Filter"><LINK REL="STYLESHEET" HREF="ch05.css"><TITLE> 5.5	Race conditions</TITLE></HEAD><BODY BGCOLOR="#ffffff"><DIV><HR><P><A HREF="ch05.htm">Chapter&nbsp;&nbsp;start</A>&nbsp;&nbsp;&nbsp;<A HREF="ch05.4.htm">Previous&nbsp;&nbsp;page</A>&nbsp;&nbsp;<A HREF="ch05.6.htm">Next&nbsp;&nbsp;page</A></P></DIV><H1 CLASS="Section"><A NAME="pgfId=139"> </A>5.5	Race conditions</H1><P CLASS="Body"><A NAME="pgfId=140"> </A>Because the execution of expression evaluation and net update events may be intermingled, race conditions are possible:</P><PRE CLASS="CodeIndent"><A NAME="pgfId=141"> </A><B CLASS="Keyword">assign</B> p = q; <B CLASS="Keyword">initial</B> <B CLASS="Keyword">begin</B>	q = 1;	#1 q = 0; 	<B CLASS="Keyword">$display</B>(p); <B CLASS="Keyword">end</B></PRE><P CLASS="Body"><A NAME="pgfId=142"> </A>The simulator is correct in displaying either a <CODE CLASS="code">1</CODE> or a <CODE CLASS="code">0</CODE> here. The assignment of <CODE CLASS="code">0</CODE> to <CODE CLASS="code">q</CODE> enables an update event for <CODE CLASS="code">p</CODE>. The simulator may either continue and execute the $display task, or execute the update for <CODE CLASS="code">p</CODE>, followed by the $display task.</P><HR><P><A HREF="ch05.htm">Chapter&nbsp;&nbsp;start</A>&nbsp;&nbsp;&nbsp;<A HREF="ch05.4.htm">Previous&nbsp;&nbsp;page</A>&nbsp;&nbsp;<A HREF="ch05.6.htm">Next&nbsp;&nbsp;page</A></P></BODY></HTML>

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