Priority inversion is a situation where in lower priority

tasks will run blocking higher priority tasks waiting for

resource (mutex). For ex: consider 3 tasks. A, B and C, A

being highest priority task and C is lowest. Look at

sequence of context swaps

A goes for I/O . unlocks mutex.

C was ready to run. So C starts running. locks mutex

B is ready to run. Swaps out C and takes mutex.

A is ready to run. but A is blocked as mutex is locked by B.

but B will never relinqishes the mutex as its higher

priority than C.

The solution to priority inversion is Priority inheritance.