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???
01/08/07 16:17
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 		 #130434 - ring buffer, atomicity and C
Responding to: ???'s previous message
C does allow a simple construct for ring buffers without any atomicity issues

char fetch;
char store;

in the ISR
buffer[store] = SBUF;
store++;
store &= (Bufffer_sixe - 1)

in the main
if (fetch != store)
{
.........

Erik

List of 32 messages in thread
TopicAuthorDate
atomicity, multibyte variables, C and my comfort            01/01/70 00:00      
   No way            01/01/70 00:00      
      Well, theoretically ...            01/01/70 00:00      
   Yes sdcc at least            01/01/70 00:00      
      Keil            01/01/70 00:00      
   Does it matter?            01/01/70 00:00      
      sort of...            01/01/70 00:00      
         Lack of this feature ...            01/01/70 00:00      
            really?            01/01/70 00:00      
   talking out of both sides of the mouth            01/01/70 00:00      
      :-)            01/01/70 00:00      
         the simple solution            01/01/70 00:00      
            The question was not how to fix it...            01/01/70 00:00      
   Don't disable            01/01/70 00:00      
      C extensions            01/01/70 00:00      
         ring buffer, atomicity and C            01/01/70 00:00      
            OK that was a stupid example...            01/01/70 00:00      
      Hardware solution called for            01/01/70 00:00      
         isn't HLL supposed to hide the low level details?            01/01/70 00:00      
            the skinny            01/01/70 00:00      
               Word length & Atomicity            01/01/70 00:00      
            Side effects            01/01/70 00:00      
               questions and answers            01/01/70 00:00      
                  Embedded Specific            01/01/70 00:00      
                     Neil, you GOT it            01/01/70 00:00      
                        waitaminute...            01/01/70 00:00      
                           from an old hand to a newbie            01/01/70 00:00      
                              what helps is good (?)            01/01/70 00:00      
                                 The warning you propose would be 'wrong' in some c            01/01/70 00:00      
                                    wrong warnings            01/01/70 00:00      
                                       Read-Modify-Write            01/01/70 00:00      
                                          OK then not simple            01/01/70 00:00      

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