The kind of thread that will give the most efficient execution in this scenario is the tapered thread.
It should be noted that a tapered thread simply means a thread that simply tapers along the thread profile.
In this case, since a thread spends most of its time in a busy waiting loop while the other two threads are tightly coupled, then the tapered thread is appropriate.
Learn more about threads on:
https://brainly.com/question/25004623