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I save a sample Struct 
 
struct Packet 
{ 
&nbsp; unsigned int &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;l_Priority &nbsp;: 5; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
&nbsp; unsigned int &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CRC &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; : 8; 
&nbsp; 
&nbsp; bool operator &lt;&nbsp;(Packet* msg) const &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
&nbsp; { 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;return l_Priority &lt;&nbsp;msg-&gt;l_Priority ; 
&nbsp; } 
&nbsp; bool operator &gt;&nbsp;(Packet* msg) const &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
&nbsp; { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;return l_Priority &gt;&nbsp;msg-&gt;l_Priority ; 
&nbsp; } 
}; 
in a priority_queue 
&nbsp;typedef std::priority_queue &lt;const Packet*&gt; Msg_Queue; 
but it not works!! 
I try to excute following test code 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Packet* p1; 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Packet* p2; 
 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;p1 = new Packet(); 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;p2 = new Packet(); 
 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;p1-&gt;l_Priority = 1; 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;p2-&gt;l_Priority = 3; 
 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if (p1 &gt;&nbsp;p2) 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;printf(&quot;p1 &gt;&nbsp;p2\n&quot;); 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;else 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;printf(&quot;p1 &lt;&nbsp;p2\n&quot;); 
the result seems always p1 &gt;&nbsp;p2, even though p1-&gt;l_Priority &lt;&nbsp;p1-&gt;l_Priority 
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I save a sample Struct 

struct Packet
{
 unsigned int	l_Priority : 5;	 
 unsigned int	CRC	 : 8;
 
 bool operator < (Packet* msg) const	
 { 
	 return l_Priority < msg->l_Priority ;
 }
 bool operator > (Packet* msg) const	
 { 			
	 return l_Priority > msg->l_Priority ;
 }
};
in a priority_queue
 typedef std::priority_queue <const Packet*> Msg_Queue;
but it not works!!
I try to excute following test code
	Packet* p1;
	Packet* p2;

	p1 = new Packet();
	p2 = new Packet();

	p1->l_Priority = 1;
	p2->l_Priority = 3;

	if (p1 > p2)
		printf("p1 > p2\n");
	else
		printf("p1 < p2\n");
the result seems always p1 > p2, even though p1->l_Priority < p1->l_Priority

Why does't this work. faint.........about priority_queue

Kernel and system programming is the process of creating the software necessary for a computer or device to function and operate other programs. Some operating systems (such as Microsoft Windows) are proprietary, but others, such as the various Linux distributions, are open source.