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In the book Linux System Programming, 2nd Edition, the difference between coroutines and fiber is explained as follows:
Coroutines and fibers provide a unit of execution even lighter in weight than the thread (with the former being their name when they are a programming language construct, and the latter when they are a system construct).
I have some example of Coroutines (language constructs) but unable to find the example of Fibers.
Can anyone provide me some example of Fiber (a system construct)?
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Fibers (sometimes called stackful coroutines or user mode cooperatively scheduled threads) and stackless coroutines (compiler synthesized state machines) represent two distinct programming facilities with vast performance and functionality differences.
Coroutines: Exactly fibers, except not OS-managed. Goroutines: They claim to be unlike anything else, but they seem to be exactly green threads, as in, process-managed in a single address space and multiplexed onto system threads.
Lightweight: You can run many coroutines on a single thread due to support for suspension, which doesn't block the thread where the coroutine is running. Suspending saves memory over blocking while supporting many concurrent operations. Fewer memory leaks: Use structured concurrency to run operations within a scope.
A coroutine is an instance of suspendable computation. It is conceptually similar to a thread, in the sense that it takes a block of code to run that works concurrently with the rest of the code. However, a coroutine is not bound to any particular thread.
You could take a look at boost.coroutine2 and boost.fiber (C++ libraries) - both use the same context switching mechanism (callcc()/continuation) from boost.context.
In short - the difference between coroutines and fibers is, that the context switch between fibers is managed by a scheduler (selects the next fiber ...). Coroutines don't have a concept of a scheduler.
A more detailed explanation of the difference between coroutines and fibers can be read in N4024: Distinguishing coroutines and fibers.
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