如何使用POSIX线程使用线程标识符调用线程函数？

I'm new to posix threads. I'm working on a project in which one component upon initialization creates all posix threads. The other component has to request pool manager if there is any thread free. If free, pool manager returns thread handler and the other component handover its data to that thread handler. I've two questions:I'm new to posix threads. I'm working on a proj