Question

What are the two major issues of many-to-one threading mode, and how to avoid/address them.

Explain what is thread pool, and describe the problem it tries to solve

Answer 1

Answer)
In the many-to-one model of threading mode, the many user-level threads are all mapped onto a single kernel thread. The major issues regarding this mode are that the kernel mode becomes a resource whose unavailability can cause the group of threads to block a group of threads.
It is also more complicated to be implemented as we have to change kernel mode threads as resources.
The thread pool is the design pattern of software which is used for achieving concurrency of execution. A thread pool maintains many threads which are waiting for tasks which can be allocated for the concurrent execution and this all is done by the program which is supervising it. This can be done to increase the performance and also reducing and avoiding the latency during the execution.