libthread-pool-dev binary package in Ubuntu Focal riscv64

 A thread pool is a software design pattern for achieving concurrency of
 execution in a computer program. Often also called a replicated workers
 or worker-crew model,[1] a thread pool maintains multiple threads
 waiting for tasks to be allocated for concurrent execution by the
 supervising program.
 .
 This package contains the static library and the header files.

Source package