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Currently, the print information of this test case fails to demonstrate that
the high-priority thread has preempted the low-priority thread. This is because
when the high-priority thread prints the thread list, there is no information
about the low-priority thread (tlow), as tlow has already completed execution
and been destroyed. Therefore, the current execution logic cannot confirm the
successful completion of the preemption operation.
Solution: After the low-priority thread (tlow) releases the lock, add a busy-wait
loop while(!finish_flag);. At this point, when the high-priority thread (thigh)
prints the thread list information, tlow can be observed in the ready state, indicating
that it has been preempted by thigh.
Signed-off-by: Mengchen Teng <[email protected]>
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