Adopt Swift 6. Drop support for Xcode 15 and below (#39)

* Adopt Swift 6. Drop support for Xcode 15 and below

* Update README

* Simplify MainActor

* Simplify ActorQueue

Author: dfed

.github/workflows/ci.yml

@@ -9,44 +9,40 @@ on:
 jobs:
   pod-lint:
     name: Pod Lint
-    runs-on: ubuntu-latest
+    runs-on: macos-14
     steps:
-      - uses: ruby/setup-ruby@v1
-        with:
-          ruby-version: '3.3.1'
       - name: Checkout Repo
         uses: actions/checkout@v4
-      - name: Setup Swift Environment
-        uses: swift-actions/setup-swift@v2
+      - uses: ruby/setup-ruby@v1
         with:
-          swift-version: 5.9
-      - name: Bundle Install
-        run: bundle install
+          ruby-version: '3.3.5'
+          bundler-cache: true
+      - name: Select Xcode Version
+        run: sudo xcode-select --switch /Applications/Xcode_16.app/Contents/Developer
       - name: Lint Podspec
-        run: bundle exec pod lib lint --verbose --fail-fast --swift-version=5.9
-  spm-15:
-    name: Build Xcode 15
+        run: bundle exec pod lib lint --verbose --fail-fast --swift-version=6.0
+  spm-16:
+    name: Build Xcode 16
     runs-on: macos-14
     strategy:
       matrix:
         platforms: [
-          'iOS_17,watchOS_10',
-          'macOS_14,tvOS_17',
-          'visionOS_1'
+          'iOS_18,watchOS_11',
+          'macOS_15,tvOS_18',
+          'visionOS_2'
         ]
       fail-fast: false
     steps:
-      - uses: ruby/setup-ruby@v1
-        with:
-          ruby-version: '3.3.1'
       - name: Checkout Repo
         uses: actions/checkout@v4
-      - name: Bundle Install
-        run: bundle install
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: '3.3.5'
+          bundler-cache: true
       - name: Select Xcode Version
-        run: sudo xcode-select --switch /Applications/Xcode_15.4.app/Contents/Developer
+        run: sudo xcode-select --switch /Applications/Xcode_16.app/Contents/Developer
       - name: Download visionOS
-        if: matrix.platforms == 'visionOS_1'
+        if: matrix.platforms == 'visionOS_2'
         run: |
           sudo xcodebuild -runFirstLaunch
           sudo xcrun simctl list
@@ -61,31 +57,27 @@ jobs:
         uses: codecov/codecov-action@v4
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
-  spm-15-swift:
-    name: Swift Build Xcode 15
+  spm-16-swift:
+    name: Swift Build Xcode 16
     runs-on: macos-14
     steps:
-      - uses: ruby/setup-ruby@v1
-        with:
-          ruby-version: '3.3.1'
       - name: Checkout Repo
         uses: actions/checkout@v4
-      - name: Bundle Install
-        run: bundle install
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: '3.3.5'
+          bundler-cache: true
       - name: Select Xcode Version
-        run: sudo xcode-select --switch /Applications/Xcode_15.4.app/Contents/Developer
+        run: sudo xcode-select --switch /Applications/Xcode_16.app/Contents/Developer
       - name: Build and Test Framework
         run: xcrun swift test -c release -Xswiftc -enable-testing
   linux:
     name: "Build and Test on Linux"
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
+    container: swift:6.0
     steps:
       - name: Checkout Repo
         uses: actions/checkout@v4
-      - name: Setup Swift Environment
-        uses: swift-actions/setup-swift@v2
-        with:
-          swift-version: 5.9
       - name: Build and Test Framework
         run: swift test -c release --enable-code-coverage -Xswiftc -enable-testing
       - name: Prepare Coverage Reports

.ruby-version

@@ -1 +1 @@
-3.3.1
+3.3.5

AsyncQueue.podspec

@@ -1,12 +1,12 @@
 Pod::Spec.new do |s|
   s.name     = 'AsyncQueue'
-  s.version  = '0.5.2'
+  s.version  = '0.6.0'
   s.license  = 'MIT'
   s.summary  = 'A queue that enables ordered sending of events from synchronous to asynchronous code.'
   s.homepage = 'https://github.com/dfed/swift-async-queue'
   s.authors  = 'Dan Federman'
   s.source   = { :git => 'https://github.com/dfed/swift-async-queue.git', :tag => s.version }
-  s.swift_version = '5.9'
+  s.swift_version = '6.0'
   s.source_files = 'Sources/**/*.{swift}'
   s.ios.deployment_target = '13.0'
   s.tvos.deployment_target = '13.0'

Gemfile

@@ -1,4 +1,4 @@
-ruby '3.3.1'
+ruby '3.3.5'
 
 source 'https://rubygems.org'
 

Gemfile.lock

@@ -5,7 +5,7 @@ GEM
       base64
       nkf
       rexml
-    activesupport (7.2.0)
+    activesupport (7.2.1)
       base64
       bigdecimal
       concurrent-ruby (~> 1.0, >= 1.3.1)
@@ -74,22 +74,20 @@ GEM
     fuzzy_match (2.0.4)
     gh_inspector (1.1.3)
     httpclient (2.8.3)
-    i18n (1.14.5)
+    i18n (1.14.6)
       concurrent-ruby (~> 1.0)
     json (2.7.2)
-    logger (1.6.0)
+    logger (1.6.1)
     minitest (5.25.1)
     molinillo (0.8.0)
     nanaimo (0.3.0)
     nap (1.1.0)
     netrc (0.11.0)
     nkf (0.2.0)
     public_suffix (4.0.7)
-    rexml (3.3.6)
-      strscan
+    rexml (3.3.7)
     ruby-macho (2.5.1)
     securerandom (0.3.1)
-    strscan (3.1.0)
     typhoeus (1.4.1)
       ethon (>= 0.9.0)
     tzinfo (2.0.6)
@@ -109,7 +107,7 @@ DEPENDENCIES
   cocoapods (~> 1.15.0)
 
 RUBY VERSION
-   ruby 3.3.1p55
+   ruby 3.3.5p100
 
 BUNDLED WITH
-   2.5.9
+   2.5.16

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version: 5.9
+// swift-tools-version: 6.0
 // The swift-tools-version declares the minimum version of Swift required to build this package.
 
 import PackageDescription
@@ -23,13 +23,13 @@ let package = Package(
             name: "AsyncQueue",
             dependencies: [],
             swiftSettings: [
-                .enableUpcomingFeature("StrictConcurrency")
+                .swiftLanguageMode(.v6),
             ]),
         .testTarget(
             name: "AsyncQueueTests",
             dependencies: ["AsyncQueue"],
             swiftSettings: [
-                .enableUpcomingFeature("StrictConcurrency")
+                .swiftLanguageMode(.v6),
             ]),
     ]
 )

Package@swift-6.0.swift

@@ -9,11 +9,10 @@ A library of queues that enable sending ordered tasks from synchronous to asynch
 
 ## Task Ordering and Swift Concurrency
 
-Tasks sent from a synchronous context to an asynchronous context in Swift Concurrency prior to Swift 6 are inherently unordered. Consider the following test:
+Tasks sent from a synchronous context to an asynchronous context in Swift Concurrency are inherently unordered. Consider the following test:
 
 ```swift
-@MainActor
-func testMainActorTaskOrdering() async {
+func testActorTaskOrdering() async {
     actor Counter {
         func incrementAndAssertCountEquals(_ expectedCount: Int) {
             count += 1
@@ -167,12 +166,12 @@ func testMainActorQueueOrdering() async {
 
 ## Requirements
 
-* Xcode 15.0 or later.
+* Xcode 16.0 or later.
 * iOS 13 or later.
 * tvOS 13 or later.
 * watchOS 6 or later.
 * macOS 10.15 or later.
-* Swift 5.9 or later.
+* Swift 5.10 or later.
 
 ## Installation
 
@@ -182,7 +181,7 @@ To install swift-async-queue in your project with [Swift Package Manager](https:
 
 ```swift
 dependencies: [
-    .package(url: "https://github.com/dfed/swift-async-queue", from: "0.5.0"),
+    .package(url: "https://github.com/dfed/swift-async-queue", from: "0.6.0"),
 ]
 ```
 
@@ -192,7 +191,7 @@ To install swift-async-queue in your project with [CocoaPods](http://cocoapods.o
 
 ```
 platform :ios, '13.0'
-pod 'AsyncQueue', '~> 0.5.0'
+pod 'AsyncQueue', '~> 0.6.0'
 ```
 
 ## Contributing