local coro = require'coro'
Symmetric coroutines are coroutines that allow you to transfer control to a specific coroutine, unlike Lua's standard coroutines which only allow you to suspend execution to the calling coroutine.
This is the implementation from the paper Coroutines in Lua.
Changes from the paper:
- threads created with
coro.create() finish into the creator thread not main thread, unless otherwise specified.
coro.wrap() similar to
coro.create(f[, return_thread]) -> coro_thread
Create a symmetric coroutine, optionally specifying the thread which the coroutine should transfer control to when it finishes execution (defaults to
coro.transfer(coro_thread[, send_val]) -> recv_val
Transfer control to a symmetric coroutine, suspending execution. The target coroutine either hasn't started yet, or it is itself suspended in a call to
coro.transfer(), in which case it resumes and receives
send_val as the return value of the call. Likewise, the coroutine which transfers execution will stay suspended until
coro.transfer() is called again with it as target.
coro.current -> coro_thread
Currently running symmetric coroutine. Defaults to
coro.main -> coro_thread
The coroutine representing the main thread (the thread that calls
coro.transfer for the first time).
coro.wrap(f) -> f
coroutine.wrap for symmetric coroutines. Useful for creating iterators in an environment of symmetric coroutines in which simply calling
coroutine.yield is not an option:
local parent = coro.current
local iter = coro.wrap(function()
local function yield(val)
23 months ago
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