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103 lines
3.6 KiB
Swift
103 lines
3.6 KiB
Swift
//===----------------------------------------------------------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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import _SwiftDispatchOverlayShims
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public struct DispatchWorkItemFlags : OptionSet, RawRepresentable {
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public let rawValue: UInt
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public init(rawValue: UInt) { self.rawValue = rawValue }
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public static let barrier = DispatchWorkItemFlags(rawValue: 0x1)
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@available(OSX 10.10, iOS 8.0, *)
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public static let detached = DispatchWorkItemFlags(rawValue: 0x2)
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@available(OSX 10.10, iOS 8.0, *)
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public static let assignCurrentContext = DispatchWorkItemFlags(rawValue: 0x4)
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@available(OSX 10.10, iOS 8.0, *)
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public static let noQoS = DispatchWorkItemFlags(rawValue: 0x8)
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@available(OSX 10.10, iOS 8.0, *)
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public static let inheritQoS = DispatchWorkItemFlags(rawValue: 0x10)
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@available(OSX 10.10, iOS 8.0, *)
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public static let enforceQoS = DispatchWorkItemFlags(rawValue: 0x20)
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}
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@available(OSX 10.10, iOS 8.0, *)
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public class DispatchWorkItem {
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internal var _block: _DispatchBlock
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public init(qos: DispatchQoS = .unspecified, flags: DispatchWorkItemFlags = [], block: @escaping @convention(block) () -> Void) {
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_block = _swift_dispatch_block_create_with_qos_class(
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__dispatch_block_flags_t(rawValue: flags.rawValue),
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qos.qosClass.rawValue, Int32(qos.relativePriority), block)
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}
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// Used by DispatchQueue.synchronously<T> to provide a path through
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// dispatch_block_t, as we know the lifetime of the block in question.
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internal init(flags: DispatchWorkItemFlags = [], noescapeBlock: () -> Void) {
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_block = _swift_dispatch_block_create_noescape(
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__dispatch_block_flags_t(rawValue: flags.rawValue), noescapeBlock)
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}
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public func perform() {
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_block()
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}
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public func wait() {
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_ = _swift_dispatch_block_wait(_block, DispatchTime.distantFuture.rawValue)
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}
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public func wait(timeout: DispatchTime) -> DispatchTimeoutResult {
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return _swift_dispatch_block_wait(_block, timeout.rawValue) == 0 ? .success : .timedOut
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}
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public func wait(wallTimeout: DispatchWallTime) -> DispatchTimeoutResult {
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return _swift_dispatch_block_wait(_block, wallTimeout.rawValue) == 0 ? .success : .timedOut
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}
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public func notify(
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qos: DispatchQoS = .unspecified,
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flags: DispatchWorkItemFlags = [],
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queue: DispatchQueue,
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execute: @escaping @convention(block) () -> Void)
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{
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if qos != .unspecified || !flags.isEmpty {
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let item = DispatchWorkItem(qos: qos, flags: flags, block: execute)
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_swift_dispatch_block_notify(_block, queue, item._block)
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} else {
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_swift_dispatch_block_notify(_block, queue, execute)
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}
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}
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public func notify(queue: DispatchQueue, execute: DispatchWorkItem) {
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_swift_dispatch_block_notify(_block, queue, execute._block)
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}
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public func cancel() {
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_swift_dispatch_block_cancel(_block)
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}
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public var isCancelled: Bool {
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return _swift_dispatch_block_testcancel(_block) != 0
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}
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}
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/// The dispatch_block_t typealias is different from usual closures in that it
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/// uses @convention(block). This is to avoid unnecessary bridging between
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/// C blocks and Swift closures, which interferes with dispatch APIs that depend
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/// on the referential identity of a block. Particularly, dispatch_block_create.
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internal typealias _DispatchBlock = @convention(block) () -> Void
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