<div>Are you also considering multiple levels of priority? In the reader / processor / writer case, I can think of several priorities the processor might want:</div>
<div> </div>
<div>1. Normal -- here is another buffer to write.</div>
<div>2. Medium -- the file read failed, stop with this file.</div>
<div>3. Medium#2 -- too much information too fast, please stop sending until further notice.</div>
<div>4. High -- The system is going down, pack up and get out of dodge</div>
<div> </div>
<div>I'm not sure if #2 and #3 need to be at different levels, but it seems like 1, (2 or 3), and 4 should be distinct. E.g. you don't care about either Medium if there is a High in the pipe and you want to process Normals after any High or Medium is handled.</div>
<div> </div>
<div>This argues for a many-level approach, which might as well be an integer or short.</div>
<div> </div>
<div>Kevin</div>
<div> </div>
<div class="gmail_quote">On Mon, Jan 25, 2010 at 11:29 AM, Andrei Alexandrescu <span dir="ltr"><<a href="mailto:andrei@erdani.com">andrei@erdani.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div class="im">Michel Fortin wrote:<br>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">Personally I'd tend to just not define any priority and deal with<br>things in a FIFO manner to keep things simple. If you want to add<br>
complexity (priority), it should be justified by use cases. So which<br>use case do you have in mind for priority?<br></blockquote><br></div>Upon further thinking, I realized there's need for two orthogonal things:<br>
<br>1. Priority messages of any type. They'll be put to the front of the queue.<br><br>2. "Must handle" messages that unblock any call to receive(). They may or may not have priority. These may be derived from Exception.<br>
<br>It's never simple is it :o/.<br><font color="#888888"><br><br>Andrei</font>
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