● cobegin ● process P1 ● begin inside[]:=true while inside do if turn=2 then begin inside[l]: =false while turn=2 do begin end inside[1]:=true end 临界区; turn inside[1]:=false end⚫ cobegin ⚫ process P1 ⚫ begin ⚫ inside[1]:=true; ⚫ while inside[2] do if turn=2 then ⚫ begin ⚫ inside[1]:=false; ⚫ while turn=2 do begin end; ⚫ inside[1]:=true; ⚫ end ⚫ 临界区; ⚫ turn = 2； ⚫ inside[1]:=false; ⚫ end;