Assume a preemptive priority system with two tasks, 1 and 2 (with 1 >

Assume a preemptive priority system with two tasks, τ₁ and τ₂ (with τ₁ > τ₂), which share a single critical resource. Show with an appropriate execution scenario that a simple software flag (a global variable) at the level of application tasks is not adequate for providing safe sharing of the critical resource.