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// RUN: %target-run-simple-swift(-parse-as-library -target %target-swift-5.1-abi-triple -Xfrontend -concurrency-model=task-to-thread -g -Xlinker -object_path_lto -Xlinker /tmp/abc.o)
// REQUIRES: concurrency
// REQUIRES: executable_test
// REQUIRES: freestanding
// REQUIRES: concurrency_runtime
@_spi(_TaskToThreadModel) import _Concurrency
import StdlibUnittest
import Darwin
var a = 0;
func foo() async -> Int {
a += 1
print("a is now \(a)")
return a
}
func bar() async -> Int {
a += 2
print("a is now \(a)")
return a
}
func asyncFib(_ n: Int, _ expected_thread: pthread_t) async -> Int {
expectEqual(pthread_self(), expected_thread);
if n == 0 || n == 1 {
return n
}
async let first = asyncFib(n-2, expected_thread)
async let second = asyncFib(n-1, expected_thread)
return (await second) + (await first)
}
func fib(_ n: Int) -> Int {
var first = 0
var second = 1
for _ in 0..<n {
let temp = first
first = second
second = temp + first
}
return first
}
@main struct Main {
static func main() {
let tests = TestSuite("Execute child task on await")
tests.test("Basic async let only execute on await") {
Task.runInline {
async let a = foo()
async let b = bar()
expectEqual(await b, 2)
expectEqual(await a, 3)
// Re-querying a completed task should return original result and not
// reexecute it
expectEqual(await b, 2)
}
}
tests.test("Nested async lets that only execute on await") {
Task.runInline {
let result = await asyncFib(10, pthread_self())
expectEqual(result, fib(10))
}
}
tests.test("Task group execute child task on await simple") {
a = 0
Task.runInline {
await withTaskGroup(of: Int.self, body : { group in
let currentThread = pthread_self()
group.addTask {
expectEqual(pthread_self(), currentThread);
return await foo()
}
group.addTask {
expectEqual(pthread_self(), currentThread);
return await bar()
}
})
}
}
tests.test("Task groups with nested structured concurrency") {
Task.runInline {
await withTaskGroup(of: Int.self, body : { group in
let currentThread = pthread_self()
group.addTask {
return await asyncFib(10, currentThread);
}
group.addTask {
return await asyncFib(5, currentThread);
}
})
}
}
runAllTests()
}
}
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