Initial Package Commit

Added the `ThreadSafeSemaphore` Property Wrapper

Author: LK-Simon

.gitignore

@@ -88,3 +88,4 @@ fastlane/test_output
 # https://github.com/johnno1962/injectionforxcode
 
 iOSInjectionProject/
+.DS_Store

.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata

@@ -0,0 +1,28 @@
+// swift-tools-version: 5.6
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "ThreadSafeSwift",
+    products: [
+        // Products define the executables and libraries a package produces, and make them visible to other packages.
+        .library(
+            name: "ThreadSafeSwift",
+            targets: ["ThreadSafeSwift"]),
+    ],
+    dependencies: [
+        // Dependencies declare other packages that this package depends on.
+        // .package(url: /* package url */, from: "1.0.0"),
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
+        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        .target(
+            name: "ThreadSafeSwift",
+            dependencies: []),
+        .testTarget(
+            name: "ThreadSafeSwiftTests",
+            dependencies: ["ThreadSafeSwift"]),
+    ]
+)

Package.swift

@@ -0,0 +1,3 @@
+# ThreadSafeSwift
+
+A description of this package.

README.md

@@ -0,0 +1,39 @@
+//
+// ThreadSafeSemaphore.swift
+// Copyright (c) 2022, Flowduino
+// Authored by Simon J. Stuart on 8th July 2022
+//
+// Subject to terms, restrictions, and liability waiver of the MIT License
+//
+import Foundation
+
+/**
+  Enforces a `DispatchSemaphore` Lock against the given Value Type to ensure single-threaded access.
+ - Author: Simon J. Stuart
+ - Version: 1.0
+ */
+@propertyWrapper
+public struct ThreadSafeSemaphore<T> {
+    public var lock = DispatchSemaphore(value: 1)
+    private var value: T
+    
+    public var wrappedValue: T {
+        get {
+            lock.wait()
+            let result = value
+            lock.signal()
+            return result
+        }
+        set {
+            lock.wait()
+            value = newValue
+            lock.signal()
+        }
+    }
+    
+    public init(wrappedValue: T) {
+        lock.wait()
+        value = wrappedValue
+        lock.signal()
+    }
+}

Sources/ThreadSafeSwift/Property Wrappers/ThreadSafeSemaphore.swift

@@ -0,0 +1,11 @@
+import XCTest
+@testable import ThreadSafeSwift
+
+final class ThreadSafeSwiftTests: XCTestCase {
+    func testExample() throws {
+        // This is an example of a functional test case.
+        // Use XCTAssert and related functions to verify your tests produce the correct
+        // results.
+//        XCTAssertEqual(ThreadSafeSwift().text, "Hello, World!")
+    }
+}