What are the main objects or structures used in the scheduler to manage goroutines?

In the Go (Golang) scheduler, the main objects for managing goroutines are:

• G (goroutine) — a structure representing an individual goroutine, containing its state and execution context.
• M (machine) — represents a system thread of the operating system on which goroutines are executed.
• P (processor) — an abstraction of a processor that links goroutines (G) and system threads (M). P manages the queue of goroutines ready to run.

The Go scheduler distributes goroutines (G) to available processors (P), which in turn are run on OS threads (M). This model allows efficient utilization of multithreading and scheduling the execution of a large number of lightweight goroutines.