Daemon vs Detached Threads — What Are They For?
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A daemon thread (Java/Python) is a background helper that won’t keep the program alive—when only daemon threads remain, the process can exit and those threads are stopped abruptly. A detached thread (POSIX/C++ std::thread::detach) is a thread you cannot join; it runs to completion and cleans up its own resources, but you can’t wait for its result. Short version: daemon = shutdown behavior (doesn’t block process exit), detached = ownership/synchronization (no joining). Use daemon threads for best-effort background tasks (timers, heartbeats); use detached threads when you truly don’t need results or coordination later.
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