Fix potential BSD locking race. #98
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In practise, this shouldn't be a big change.
osWriteLockshould only fail when going fromSHAREDtoRESERVED(or directly toEXCLUSIVEwhen recovering a hot journal).Neither transition invokes the busy handler:
https://github.com/sqlite/sqlite/blob/version-3.46.0/src/pager.c#L3688-L3693
And both transitions should immediately abort any transactions, and invalidate reads made under
SHARED.This change is only motivated by an overabundance of caution.