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Coroutines

• A coroutine is a subprogram that has multiple entries and controls them itself

• Also called symmetric control

• A coroutine call is named a resume

• The first resume of a coroutine is to its beginning, but subsequent calls enter at the point just after the last executed statement in the coroutine

• Typically, coroutines repeatedly resume each other, possibly forever

• Coroutines provide quasiconcurrent execution of program units (the coroutines)

• Their execution is interleaved, but not overlapped