Fix warning - Sending value of non-Sendable type '() async -> ()' risks causing data races (#8937)

rconnell9 · web-flow · commit 7b1a9181eddf · 2025-07-15T16:54:29.000-04:00
### Motivation:

Warning: Sending value of non-Sendable type '() async -&gt; ()' risks
causing data races; this is an error in the Swift 6 language mode

### Modifications:

Require template type to inherit from Sendable
diff --git a/Sources/Basics/Concurrency/ConcurrencyHelpers.swift b/Sources/Basics/Concurrency/ConcurrencyHelpers.swift
@@ -26,7 +26,7 @@ public enum Concurrency {
 }
 
 @available(*, noasync, message: "This method blocks the current thread indefinitely. Calling it from the concurrency pool can cause deadlocks")
-public func unsafe_await<T>(_ body: @Sendable @escaping () async -> T) -> T {
+public func unsafe_await<T: Sendable>(_ body: @Sendable @escaping () async -> T) -> T {
     let semaphore = DispatchSemaphore(value: 0)
 
     let box = ThreadSafeBox<T>()

Original file line number	Diff line number	Diff line change
`@@ -26,7 +26,7 @@ public enum Concurrency {`
`26`	`26`	`}`
`27`	`27`
`28`	`28`	`@available(*, noasync, message: "This method blocks the current thread indefinitely. Calling it from the concurrency pool can cause deadlocks")`
`29`		`-public func unsafe_await<T>(_ body: @Sendable @escaping () async -> T) -> T {`
	`29`	`+public func unsafe_await<T: Sendable>(_ body: @Sendable @escaping () async -> T) -> T {`
`30`	`30`	`let semaphore = DispatchSemaphore(value: 0)`
`31`	`31`
`32`	`32`	`let box = ThreadSafeBox<T>()`