Before we proceed with our examples

Before we proceed with our examples of thread creation, we introduce two general strategies for creating multiple threads: asynchronous threading and synchronous threading.
With asynchronous threading, once the parent creates a child thread, the parent resumes its execution, so that the parent and child execute concurrently.
Each thread runs independently of every other thread, and the parent thread need not know when its child terminates.
Because the threads are independent, there is typically little data sharing between threads. Asynchronous threading is the strategy used in the multithreaded server illustrated in Figure 4.2.