The API is generally categorized into three major functional areas: 1. Thread Management This is how you "spawn" and "clean up" your threads.
Unlike "forking" a new process, which requires a separate memory space, threads share the same address space. This makes communication as simple as passing a pointer, avoiding expensive memory copies.
Because it follows a strict POSIX standard, code written with PThreads is highly portable across nearly all Unix-based operating systems.
PThreads provides "zero magic." It gives developers explicit control over thread creation, attributes (like stack size), and scheduling. The Core Pillars of PThreads
pthread_create : Starts a new thread to execute a specific function.