fix: Resolve race condition between visited flag and result of ready postcondition #2886
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Signed-off-by: Adrian Kłoskowski <adrian.kloskowski@ds.pl>
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Fix for a problem described in #2885.
The changed code causes that when
visitedflag is changed to true, we are sure that readyPostconditionResult was checked before. In previous version,visitedflag set to true and readyPostconditionResult equals null could describe two situations:The changed code doesn't let the second situation to happen.