41 lines
1.2 KiB
Swift
41 lines
1.2 KiB
Swift
// Copyright 2024 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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import Foundation
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/// Utility struct to make the execution of one task dependent upon a signal from another task.
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@available(iOS 13, tvOS 13, macOS 10.15, macCatalyst 13, watchOS 7, *)
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struct AuthCondition {
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private let waiter: () async -> Void
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private let stream: AsyncStream<Void>.Continuation
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init() {
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let (stream, continuation) = AsyncStream<Void>.makeStream()
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waiter = {
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for await _ in stream {}
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}
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self.stream = continuation
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}
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// Signal to unblock the waiter.
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func signal() {
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stream.finish()
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}
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/// Wait for the condition.
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func wait() async {
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await waiter()
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}
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}
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