Email: Password: Remember Me | Create Account (Free)

Back to Subject List

Old thread has been locked -- no new posts accepted in this thread
???
01/08/07 18:50
Read: times


 		 #130450 - Side effects
Responding to: ???'s previous message
The cure could be worse than the disease.

Let use say the compiler disables interupts to make an operation atomic "automaticlly". Now it must keep track of other disables as not to screw up the state. Now you can debug lost pulses to to the compiler. But you know the code / hardware will never let it interfere. Now what to disable all interupts, one or two of them?
Maybe a bit flag as a semiphore is better. which to use? how to tell the compiler leave it alone I have this one? Plus the compiler only sees one module at a time. Will this mess up other modules. The devil is in the details.

Plus it can never be ANSI. It is too hardware specific. ANSI does not even support interupts. It would be a compiler by compiler deal.

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      

Back to Subject List