couroutine - coroutine manipulation (standard library)
The operations related to coroutines comprise a sub-library of the
basic library and come inside the table coroutine
. See sect 2.11
for a general description of coroutines.
coroutine.create
coroutine.create (f)
Creates a new coroutine, with body f
. f
must be a Lua function.
Returns this new coroutine, an object with type "thread"
.
coroutine.resume
coroutine.resume (co [, val1, ...])
Starts or continues the execution of coroutine co
. The first time
you resume a coroutine, it starts running its body. The values
val1
, ··· are passed as the arguments to the
body function. If the coroutine has yielded, resume
restarts it;
the values val1
, ··· are passed as the results
from the yield.
If the coroutine runs without any errors, resume
returns true
plus any values passed to yield
(if the coroutine yields) or any
values returned by the body function (if the coroutine terminates).
If there is any error, resume
returns false
plus the error
message.
coroutine.running
coroutine.running ()
Returns the running coroutine, or nil
when called by the main
thread.
coroutine.status
coroutine.status (co)
Returns the status of coroutine co
, as a string: "running"
, if
the coroutine is running (that is, it called status
);
"suspended"
, if the coroutine is suspended in a call to yield
,
or if it has not started running yet; "normal"
if the coroutine is
active but not running (that is, it has resumed another coroutine);
and "dead"
if the coroutine has finished its body function, or if
it has stopped with an error.
coroutine.wrap
coroutine.wrap (f)
Creates a new coroutine, with body f
. f
must be a Lua function.
Returns a function that resumes the coroutine each time it is called.
Any arguments passed to the function behave as the extra arguments to
resume
. Returns the same values returned by resume
, except the
first boolean. In case of error, propagates the error.
coroutine.yield
coroutine.yield (...)
Suspends the execution of the calling coroutine. The coroutine cannot
be running a C function, a metamethod, or an iterator. Any arguments
to yield
are passed as extra results to resume
.
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~~~~~
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