EventableExecutor is being removed, for now, but hopefully will
return in some form in the future.
The `asSchedulable` implementation needs to change for reasons of
ABI stability.
rdar://141348916
Remove `supportsScheduling` in favour of a type-based approach.
Update the storage for `ClockTraits` to `UInt32`.
Adjust ordering of executors for `currentExecutor`.
rdar://141348916
Reorganise the Concurrency code so that it's possible to completely
implement executors (both main and global) in Swift.
Provide API to choose the desired executors for your application.
Also make `Task.Sleep` wait using the current executor, not the global
executor, and expose APIs on `Clock` to allow for conversion between
time bases.
rdar://141348916
* [Concurrency] Initial steps for startSynchronously for Task
* [Concurrency] Rename to _startSynchronously while in development
* [Concurrency] StartSynchronously special executor to avoid switching
* startSynchronously bring back more info output
* [Concurrency] startSynchronously with more custom executor tests
* add missing ABI additions to test for x86
* [Concurrency] gyb generate _startSynchronously
* [Concurrency] %import dispatch for Linux startSynchronously test
* [Concurrency] Add TaskGroup.startTaskSynchronously funcs
* [Concurrency] DispatchSerialQueue does not exist on linux still
We have been only including a subset of files and functionality on Embedded Concurrency, let's instead include all the
source files, and have a fine grained opt out on things that don't yet work. Namely, this is still avoiding clocks, task
sleeping and custom executors.
Add a test for AsyncStream and continuations on Embedded Concurrency.
The `_SwiftConcurrencyShims` module was imported `@_implementationOnly` which
was causing warnings to be emitted during the stdlib build. The module
currently serves no purpose; the only declaration it contains is a defunct
`_SwiftContext` struct which is not referenced by anything. The module needs to
continue to exist for source compatibility, though, since it is part of the
toolchain and imported publicly from other modules.
When building the Swift standard library, the compiler warns:
```
warning: capture of 'wordPtr' with non-sendable type 'UnsafeMutablePointer<Builtin.Word>' in a `@Sendable` closure
```
This diagnostic will become an error in the Swift 6 language mode, so it needs
to be addressed. This PR factors the atomic operations used by the
implementation of `Task.sleep()` into an `@unchecked Sendable` wrapper in order
to convince the compiler that these operations are thread-safe. As an added
benefit, the code is more readable when the atomic operatios are abstracted
away. This refactor intentionally translates the existing implementation into a
wrapper as faithfully as possible and does not attempt to improve on any other
aspects of the implementation, such as the unsafe manual memory allocation and
deallocation.
The back-deployed Swift Concurrency library should not contain anything
based on clocks or durations, which aren't always available in the
underlying system. Move that functionality to separate files that are
excluded from the back-deployed concurrency libraries.
This is a partial step to better approximate the back-deployment
libraries. At some point, we'll stop building the back-deployment
libraries entirely and instead use the binaries provided by the
toolchain.
Fixes rdar://89237163.
