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Question

I am implementing a simple thread pool mechanism for my ubuntu server (for my multi-client anonymous chat program), and I need to make my worker threads sleep until a job (i

Answer 1

Since a network chat program is presumably I/O-bound rather than CPU-bound, you don't really need threads. You can handle all your I/O in a single thread using a facility such as Boost.Asio or the GLib main loop. These are portable abstractions over platform-specific functions that allow a program to block waiting for activity on any of a (potentially large) set of open files or sockets, and then wake up and respond promptly when activity occurs.