In recent decades, CPU vendors have stopped focusing only on clock speed. Instead, modern CPUs are designed with multiple cores and hyperthreading (multiple logical cores on the same physical core). Therefore, to leverage these architectures, concurrency has become critical for software developers. Even though Go provides simple primitives, this doesn’t necessarily mean that writing concurrent code has become easy. This chapter discusses fundamental concepts related to concurrency; chapter 9 will then focus on practice.
Even after years of concurrent programming, developers may not clearly understand the differences between concurrency and parallelism. Before delving into Go-specific topics, it’s first essential to understand these concepts so we share a common vocabulary. This section illustrates with a real-life example: a coffee shop.
