…ealliance#11662)

* return `TaskExit` future from `[Typed]Func::call_concurrent`

In addition to returning the value produced by the callee, these functions now
also return a `TaskExit` future which resolves once the subtask (and any
transitively-created subtasks) have exited.  This partially addresses bytecodealliance#11600;
the next step will be to add a `wasmtime-wit-bindgen` option to expose the
`TaskExit` value in generated bindings.

Signed-off-by: Joel Dice <joel.dice@fermyon.com>

* address review feedback

`TaskExit` now has an `async fn block` instead of closing over an `impl
AsAccessor` and implementing `Future`.

Signed-off-by: Joel Dice <joel.dice@fermyon.com>

---------

Signed-off-by: Joel Dice <joel.dice@fermyon.com>

Changes include:

* `async` option on some CM intrinsics renamed to `cancellable`
* New `backpressure.{inc,dec}` intrinsics
* New component-model-threading-related intrinsics

New features aren't yet implemented, they're left for future PRs.

)

This builds on bytecodealliance#11662 by optionally exposing the `TaskExit` return value from
`[Typed]Func::call_concurrent` in the bindings generated for exported functions.

Note that the first two commits are shared with bytecodealliance#11662.

Fixes bytecodealliance#11600

Signed-off-by: Joel Dice <joel.dice@fermyon.com>

bytecodealliance#11671)

This fixes a divergence between the spec and the implementation.  Thanks (again)
to Luke for providing a test case, which I've added here.

This addresses half of bytecodealliance#11582

Signed-off-by: Joel Dice <joel.dice@fermyon.com>

…ed (bytecodealliance#11669)

* fix panic in `Instance::set_consumer` when write end is already dropped

In this case, we can drop the whole stream or future immediately since there's
nothing left to do with it.

Fixes bytecodealliance#11621

Signed-off-by: Joel Dice <joel.dice@fermyon.com>

* add test for piping from a stream whose write end is already dropped

Signed-off-by: Joel Dice <joel.dice@fermyon.com>

---------

Signed-off-by: Joel Dice <joel.dice@fermyon.com>

* wasip3: Add support to `wasmtime serve`

This commit adds support for WASIp3 to `wasmtime serve` by detecting
whether the input component is using a WASIp3 exported interface instead
of a WASIp2 exported interface (similar to how `wasmtime run` detects
which is supported).

* Fix tests

* Log guest result

…lliance#11678)

Now we wrap the "ready" set of work items in a struct which will gracefully
dispose of the remainder if we trap or panic while handling one of them.

Fixes bytecodealliance#11668

Signed-off-by: Joel Dice <joel.dice@fermyon.com>

Added to the async specification in WebAssembly/component-model#560
these are minor adaptations to the preexisting `backpressure.set`
intrinsic and are intended to replace it. The `backpressure.set`
intrinsic will remain until tooling propagates to understand
`backpressure.{inc,dec}`.