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// RUN: %target-run-simple-swift( -target %target-swift-5.1-abi-triple %import-libdispatch -parse-as-library) | %FileCheck %s
// REQUIRES: executable_test
// REQUIRES: concurrency
// REQUIRES: libdispatch
// rdar://76038845
// REQUIRES: concurrency_runtime
// UNSUPPORTED: back_deployment_runtime
import Dispatch
@available(SwiftStdlib 5.1, *)
func asyncEcho(_ value: Int) async -> Int {
value
}
@available(SwiftStdlib 5.1, *)
func test_taskGroup_isEmpty() async {
print("before all")
let result = await withTaskGroup(of: Int.self, returning: Int.self) { group in
// CHECK: before add: isEmpty=true
print("before add: isEmpty=\(group.isEmpty)")
group.async {
await Task.sleep(2_000_000_000)
return await asyncEcho(1)
}
// CHECK: while add running, outside: isEmpty=false
print("while add running, outside: isEmpty=\(group.isEmpty)")
// CHECK: next: 1
while let value = try! await group.next() {
print("next: \(value)")
}
// CHECK: after draining tasks: isEmpty=true
print("after draining tasks: isEmpty=\(group.isEmpty)")
return 42
}
// CHECK: result: 42
print("result: \(result)")
}
@available(SwiftStdlib 5.1, *)
@main struct Main {
static func main() async {
await test_taskGroup_isEmpty()
}
}
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