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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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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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For WaitQueue, nail down the mechanism for declaring a subclass and for
calling a base-class method from a subclass override. Break out new
_wake_waiters() method from Enqueue(): we need to do the same from close(), in
case there are waiting consumers. Also, in Lua, 0 is not false.
Instead of bundling a normal/error flag with every queued value, make
ErrorQueue overload its _closed attribute. Once you call ErrorQueue:Error(),
every subsequent Dequeue() call by any consumer will re-raise the same error.
util.count() literally counts entries in a table, since #t is documented to be
unreliable. (If you create a list with 5 entries and delete the middle one, #t
might return 2 or it might return 5, but it won't return 4.)
util.join() fixes a curious omission from Luau's string library: like Python's
str.join(), it concatenates all the strings from a list with an optional
separator. We assume that incrementally building a list of strings and then
doing a single allocation for the desired result string is cheaper than
reallocating each of a sequence of partial concatenated results.
Add qtest test that posts individual items to a WaitQueue, waking waiting
consumers to retrieve the next available result. Add test proving that calling
ErrorQueue:Error() propagates the error to all consumers.
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Also qtest.lua to exercise the queue classes and inspect.lua (from
https://github.com/kikito/inspect.lua) for debugging.
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