The win32-event library provides an interface to Windows event objects. An event object is a synchronization object whose state can be explicitly set to a signaled state. Event objects are useful in sending a signal to a thread indicating that a particular event has occurred.

The win32-mutex library provides an interface for creating mutex objects on MS Windows. A mutex object is a synchronization object whose state is set to signaled when it is not owned by any thread, and non-signaled when it is owned.

The win32-semaphore library provides an interface to semaphore objects on MS Windows. A semaphore is a kernel object used for resource counting. This allows threads to query the number of resources available, and wait if there aren't any available.