Mutual Exclusion Problem     Last updated on 2014/2558 10 8, a full moon day;

For 2 channels, 2 conditional statements exist TRUE; For 4 channels, 4 conditional statements exist TRUE; For 8 channels, 8 conditional statements exist TRUE; And, notice that those invariance properties must be developed in ACT2 and ACT3 stages.

For 2 channels For 4 channels, also see: Time interleaved 4 channels; For 8 channels ...
{ ... if TRUE then do enter into critical region; Exit;

OR

if TRUE then do enter into critical region; Exit;

... }

 

 {{ ... if TRUE then do enter into critical region; Exit;

OR

if TRUE then do enter into critical region; Exit;

... }

OR

{ ... if TRUE then do enter into critical region; Exit;

OR

if TRUE then do enter into critical region; Exit;

... }}

 {{{ ... if TRUE then do enter into critical region; Exit;

OR

if TRUE then do enter into critical region; Exit;

... }

OR

{ ... if TRUE then do enter into critical region; Exit;

OR

if TRUE then do enter into critical region; Exit;

... }}

OR

{{ ... if TRUE then do enter into critical region; Exit;

OR

if TRUE then do enter into critical region; Exit;

... }

OR

{ ... if TRUE then do enter into critical region; Exit;

OR

if TRUE then do enter into critical region; Exit;

... }}}

  

Example 1

Commonly known invariance properties in C++ problem is

if ( variable = 0 ); // proper code should be     if ( variable == 0 )

Because invariance value 0 zero is bool data type false, non-zero value is bool data type true. However, in Java, the whole expression variable = 0 as integer expression which cannot be converted as Boolean data type, therefore Java programmers do not have the problem.

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