| Path | Synopsis | 
|---|---|
| runtime | Package runtime contains operations that interact with Go's runtime system, such as functions to control goroutines. | 
| sync | Package sync provides basic synchronization primitives such as mutual exclusion locks. | 
| syscall | Package syscall contains an interface to the low-level operating system primitives. | 
| unsafe | Package unsafe contains operations that step around the type safety of Go programs. |