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When enumerating C++ coroutines, it can be useful to know that a particular
Lua coroutine is simply waiting for further events.
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This helps a Lua script log its own identity, or find associated files
relative to its location in the filesystem.
Add more comprehensive logging around the start and end of a given Lua script,
or its "p.s." fiber.run() call.
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If specified as true, "tweak" means to tweak the specified "listener" name for
uniqueness. This avoids LLEventPump::listen()'s DupListenerName exception,
which causes the "listen" operation to return "status" as false.
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Earlier we had blithely designated the 'pending' list (which stores
WaitForReqid objects for pending request() and generate() calls) as a weak
table. But the caller of request() or generate() does not hold a reference to
the WaitForReqid object. Make pending hold "strong" references.
Private collections (pending, waitfors) and private scalars that are never
reassigned (reply, command) need not be entries in the leap table.
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Run each script file with new LuaState
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Make LuaListener listen for "LLApp" viewer shutdown events. On receiving such,
it closes its queue. Then the C++ coroutine calling getNext() wakes up with an
LLThreadSafeQueue exception, and calls LLCoros::checkStop() to throw one of
the exceptions recognized by LLCoros::toplevel().
Add an llluamanager_test.cpp test to verify this behavior.
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Don't use "debug" as the name of a function to conditionally write debug
messages: "debug" is a Luau built-in library, and assigning that name locally
would shadow the builtin. Use "dbg" instead.
Recast fiber.print_all() as fiber.format_all() that returns a string; then
print_all() is simply print(format_all()). This refactoring allows us to use
dbg(format_all()) as well.
Add a couple new dbg() messages at fiber state changes.
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The problem with running a `require()` module on a Lua coroutine is that it
prohibits calling `leap.request()` at module load time. When a coroutine calls
`leap.request()`, it must yield back to Lua's main thread -- but a `require()`
module is forbidden from yielding.
Running on Lua's main thread means that (after potentially giving time slices
to other ready coroutines) `fiber.lua` will request the response event from
the viewer, and continue processing the loaded module without having to yield.
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Also streamline util.contains(), given table.find().
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fiber.lua's scheduler() is greedy, in the sense that it wants to run every
ready Lua fiber before retrieving the next incoming event from the viewer (and
possibly blocking for some real time before it becomes available). But check
for viewer shutdown before resuming any suspended-but-ready Lua fiber.
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This is a very common pattern, especially in test code, but elsewhere in the
viewer too.
Use it in llluamanager_test.cpp.
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Recast fiber.yield() as internal function scheduler().
Move fiber.run() after it so it can call scheduler() as a local function.
Add new fiber.yield() that also calls scheduler(); the added value of this new
fiber.yield() over plain scheduler() is that if scheduler() returns before the
caller is ready (because the configured set_idle() function returned non-nil),
it produces an explicit error rather than returning to its caller. So the
caller can assume that when fiber.yield() returns normally, the calling fiber
is ready.
This allows any fiber, including the main thread, to call fiber.yield() or
fiber.wait(). This supports using leap.request(), which posts a request and
then waits on a WaitForReqid, which calls ErrorQueue:Dequeue(), which calls
fiber.wait().
WaitQueue:_wake_waiters() must call fiber.status() instead of
coroutine.status() so it understands the special token 'main'.
Add a new llluamanager_test.cpp test to exercise calling leap.request() from
Lua's main thread.
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This fixes a hang if the Lua script explicitly calls fiber.run() before
LuaState::expr()'s implicit fiber.run() call.
Make fiber.run() remove the calling fiber from the ready list to avoid an
infinite loop when all other fibers have terminated: "You're ready!" "Okay,
yield()." "You're ready again!" ... But don't claim it's waiting, either,
because then when all other fibers have terminated, we'd call idle() in the
vain hope that something would make that one last fiber ready.
WaitQueue:_wake_waiters() needs to wake waiting fibers if the queue's not
empty OR it's been closed.
Introduce leap.WaitFor:close() to close the queue gracefully so that a looping
waiter can terminate, instead of using WaitFor:exception(), which stops the
whole script once it propagates. Make leap's cleanup() function call close().
Streamline fiber.get_name() by using 'or' instead of if ... then.
Streamline fiber.status() and fiber.set_waiting() by using table.find()
instead of a loop.
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fiber.lua goes beyond coro.lua in that it distinguishes ready suspended
coroutines from waiting suspended coroutines, and presents a rudimentary
scheduler in fiber.yield(). yield() can determine that when all coroutines are
waiting, it's time to retrieve the next incoming event from the viewer.
Moreover, it can detect when all coroutines have completed and exit without
being explicitly told.
fiber.launch() associates a name with each fiber for debugging purposes.
fiber.get_name() retrieves the name of the specified fiber, or the running fiber.
fiber.status() is like coroutine.status(), but can return 'ready' or 'waiting'
instead of 'suspended'.
fiber.yield() leaves the calling fiber ready, but lets other ready fibers run.
fiber.wait() suspends the calling fiber and lets other ready fibers run.
fiber.wake(), called from some other coroutine, returns the passed fiber to
ready status for a future call to fiber.yield().
fiber.run() drives the scheduler to run all fibers to completion.
If, on completion of the subject Lua script, LuaState::expr() detects that the
script loaded fiber.lua, it calls fiber.run() to finish running any dangling
fibers. This lets a script make calls to fiber.launch() and then just fall off
the end, leaving the implicit fiber.run() call to run them all.
fiber.lua is designed to allow the main thread, as well as explicitly launched
coroutines, to make leap.request() calls. This part still needs debugging.
The leap.lua module now configures a fiber.set_idle() function that honors
leap.done(), but calls get_event_next() and dispatches the next incoming event.
leap.request() and generate() now leave the reqid stamp in the response. This
lets a caller handle subsequent events with the same reqid, e.g. for
LLLuaFloater.
Remove leap.process(): it has been superseded by fiber.run().
Remove leap.WaitFor:iterate(): unfortunately that would run afoul of the Luau
bug that prevents suspending the calling coroutine within a generic 'for'
iterator function.
Make leap.lua use weak tables to track WaitFor objects.
Make WaitQueue:Dequeue() call fiber.wait() to suspend its caller when the queue
is empty, and Enqueue() call fiber.wake() to set it ready again when a new
item is pushed.
Make llluamanager_test.cpp's leap test script use the fiber module to launch
coroutines, instead of the coro module. Fix a bug in which its drain()
function was inadvertently setting and testing the global 'item' variable
instead of one local to the function. Since some other modules had the same
bug, it was getting confused.
Also add printf.lua, providing a printf() function. printf() is short for
print(string.format()), but it can also print tables: anything not a number or
string is formatted using the inspect() function.
Clean up some LL_DEBUGS() output left over from debugging lua_tollsd().
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We weren't passing the WaitForReqid instance to WaitForReqid:wait().
Also remove 'reqid' from responses returned by leap.request() and generate().
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request() test ensures that the response for a given reqid is routed to the
correct coroutine even when responses arrive out of order.
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