/
Queue.swift
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/
Queue.swift
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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See http://swift.org/LICENSE.txt for license information
// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
// dispatch/queue.h
import SwiftShims
public final class DispatchSpecificKey<T> {
public init() {}
}
internal class _DispatchSpecificValue<T> {
internal let value: T
internal init(value: T) { self.value = value }
}
public extension DispatchQueue {
public struct Attributes : OptionSet {
public let rawValue: UInt64
public init(rawValue: UInt64) { self.rawValue = rawValue }
public static let concurrent = Attributes(rawValue: 1<<1)
@available(OSX 10.12, iOS 10.0, tvOS 10.0, watchOS 3.0, *)
public static let initiallyInactive = Attributes(rawValue: 1<<2)
fileprivate func _attr() -> __OS_dispatch_queue_attr? {
var attr: __OS_dispatch_queue_attr? = nil
if self.contains(.concurrent) {
attr = _swift_dispatch_queue_concurrent()
}
if #available(OSX 10.12, iOS 10.0, tvOS 10.0, watchOS 3.0, *) {
if self.contains(.initiallyInactive) {
attr = __dispatch_queue_attr_make_initially_inactive(attr)
}
}
return attr
}
}
public enum GlobalQueuePriority {
@available(OSX, deprecated: 10.10, message: "Use qos attributes instead")
@available(*, deprecated: 8.0, message: "Use qos attributes instead")
case high
@available(OSX, deprecated: 10.10, message: "Use qos attributes instead")
@available(*, deprecated: 8.0, message: "Use qos attributes instead")
case `default`
@available(OSX, deprecated: 10.10, message: "Use qos attributes instead")
@available(*, deprecated: 8.0, message: "Use qos attributes instead")
case low
@available(OSX, deprecated: 10.10, message: "Use qos attributes instead")
@available(*, deprecated: 8.0, message: "Use qos attributes instead")
case background
internal var _translatedValue: Int {
switch self {
case .high: return 2 // DISPATCH_QUEUE_PRIORITY_HIGH
case .default: return 0 // DISPATCH_QUEUE_PRIORITY_DEFAULT
case .low: return -2 // DISPATCH_QUEUE_PRIORITY_LOW
case .background: return Int(Int16.min) // DISPATCH_QUEUE_PRIORITY_BACKGROUND
}
}
}
public enum AutoreleaseFrequency {
case inherit
@available(OSX 10.12, iOS 10.0, tvOS 10.0, watchOS 3.0, *)
case workItem
@available(OSX 10.12, iOS 10.0, tvOS 10.0, watchOS 3.0, *)
case never
internal func _attr(attr: __OS_dispatch_queue_attr?) -> __OS_dispatch_queue_attr? {
if #available(OSX 10.12, iOS 10.0, tvOS 10.0, watchOS 3.0, *) {
switch self {
case .inherit:
// DISPATCH_AUTORELEASE_FREQUENCY_INHERIT
return __dispatch_queue_attr_make_with_autorelease_frequency(attr, __dispatch_autorelease_frequency_t(0))
case .workItem:
// DISPATCH_AUTORELEASE_FREQUENCY_WORK_ITEM
return __dispatch_queue_attr_make_with_autorelease_frequency(attr, __dispatch_autorelease_frequency_t(1))
case .never:
// DISPATCH_AUTORELEASE_FREQUENCY_NEVER
return __dispatch_queue_attr_make_with_autorelease_frequency(attr, __dispatch_autorelease_frequency_t(2))
}
} else {
return attr
}
}
}
public class func concurrentPerform(iterations: Int, execute work: @noescape (Int) -> Void) {
_swift_dispatch_apply_current(UInt32(iterations), work)
}
public class var main: DispatchQueue {
return _swift_dispatch_get_main_queue()
}
@available(OSX, deprecated: 10.10, message: "")
@available(*, deprecated: 8.0, message: "")
public class func global(priority: GlobalQueuePriority) -> DispatchQueue {
return __dispatch_get_global_queue(priority._translatedValue, 0)
}
@available(OSX 10.10, iOS 8.0, *)
public class func global(qos: DispatchQoS.QoSClass = .default) -> DispatchQueue {
return __dispatch_get_global_queue(Int(qos.rawValue.rawValue), 0)
}
public class func getSpecific<T>(key: DispatchSpecificKey<T>) -> T? {
let k = Unmanaged.passUnretained(key).toOpaque()
if let p = __dispatch_get_specific(k) {
let v = Unmanaged<_DispatchSpecificValue<T>>
.fromOpaque(p)
.takeUnretainedValue()
return v.value
}
return nil
}
public convenience init(
label: String,
qos: DispatchQoS = .unspecified,
attributes: Attributes = [],
autoreleaseFrequency: AutoreleaseFrequency = .inherit,
target: DispatchQueue? = nil)
{
var attr = attributes._attr()
if autoreleaseFrequency != .inherit {
attr = autoreleaseFrequency._attr(attr: attr)
}
if #available(OSX 10.10, iOS 8.0, *), qos != .unspecified {
attr = __dispatch_queue_attr_make_with_qos_class(attr, qos.qosClass.rawValue, Int32(qos.relativePriority))
}
if #available(OSX 10.12, iOS 10.0, tvOS 10.0, watchOS 3.0, *) {
self.init(__label: label, attr: attr, queue: target)
} else {
self.init(__label: label, attr: attr)
if let tq = target { self.setTarget(queue: tq) }
}
}
public var label: String {
return String(validatingUTF8: __dispatch_queue_get_label(self))!
}
@available(OSX 10.10, iOS 8.0, *)
public func sync(execute workItem: DispatchWorkItem) {
// _swift_dispatch_sync preserves the @convention(block) for
// work item blocks.
_swift_dispatch_sync(self, workItem._block)
}
@available(OSX 10.10, iOS 8.0, *)
public func async(execute workItem: DispatchWorkItem) {
// _swift_dispatch_async preserves the @convention(block)
// for work item blocks.
_swift_dispatch_async(self, workItem._block)
}
@available(OSX 10.10, iOS 8.0, *)
public func async(group: DispatchGroup, execute workItem: DispatchWorkItem) {
// _swift_dispatch_group_async preserves the @convention(block)
// for work item blocks.
_swift_dispatch_group_async(group, self, workItem._block)
}
public func async(
group: DispatchGroup? = nil,
qos: DispatchQoS = .unspecified,
flags: DispatchWorkItemFlags = [],
execute work: @convention(block) () -> Void)
{
if group == nil && qos == .unspecified && flags.isEmpty {
// Fast-path route for the most common API usage
__dispatch_async(self, work)
return
}
var block: @convention(block) () -> Void = work
if #available(OSX 10.10, iOS 8.0, *), (qos != .unspecified || !flags.isEmpty) {
let workItem = DispatchWorkItem(qos: qos, flags: flags, block: work)
block = workItem._block
}
if let g = group {
__dispatch_group_async(g, self, block)
} else {
__dispatch_async(self, block)
}
}
private func _syncBarrier(block: @noescape () -> ()) {
__dispatch_barrier_sync(self, block)
}
private func _syncHelper<T>(
fn: (@noescape () -> ()) -> (),
execute work: @noescape () throws -> T,
rescue: ((Error) throws -> (T))) rethrows -> T
{
var result: T?
var error: Error?
fn {
do {
result = try work()
} catch let e {
error = e
}
}
if let e = error {
return try rescue(e)
} else {
return result!
}
}
@available(OSX 10.10, iOS 8.0, *)
private func _syncHelper<T>(
fn: (DispatchWorkItem) -> (),
flags: DispatchWorkItemFlags,
execute work: @noescape () throws -> T,
rescue: ((Error) throws -> (T))) rethrows -> T
{
var result: T?
var error: Error?
let workItem = DispatchWorkItem(flags: flags, noescapeBlock: {
do {
result = try work()
} catch let e {
error = e
}
})
fn(workItem)
if let e = error {
return try rescue(e)
} else {
return result!
}
}
public func sync<T>(execute work: @noescape () throws -> T) rethrows -> T {
return try self._syncHelper(fn: sync, execute: work, rescue: { throw $0 })
}
public func sync<T>(flags: DispatchWorkItemFlags, execute work: @noescape () throws -> T) rethrows -> T {
if flags == .barrier {
return try self._syncHelper(fn: _syncBarrier, execute: work, rescue: { throw $0 })
} else if #available(OSX 10.10, iOS 8.0, *), !flags.isEmpty {
return try self._syncHelper(fn: sync, flags: flags, execute: work, rescue: { throw $0 })
} else {
return try self._syncHelper(fn: sync, execute: work, rescue: { throw $0 })
}
}
public func asyncAfter(
deadline: DispatchTime,
qos: DispatchQoS = .unspecified,
flags: DispatchWorkItemFlags = [],
execute work: @convention(block) () -> Void)
{
if #available(OSX 10.10, iOS 8.0, *), qos != .unspecified || !flags.isEmpty {
let item = DispatchWorkItem(qos: qos, flags: flags, block: work)
__dispatch_after(deadline.rawValue, self, item._block)
} else {
__dispatch_after(deadline.rawValue, self, work)
}
}
public func asyncAfter(
wallDeadline: DispatchWallTime,
qos: DispatchQoS = .unspecified,
flags: DispatchWorkItemFlags = [],
execute work: @convention(block) () -> Void)
{
if #available(OSX 10.10, iOS 8.0, *), qos != .unspecified || !flags.isEmpty {
let item = DispatchWorkItem(qos: qos, flags: flags, block: work)
__dispatch_after(wallDeadline.rawValue, self, item._block)
} else {
__dispatch_after(wallDeadline.rawValue, self, work)
}
}
@available(OSX 10.10, iOS 8.0, *)
public func asyncAfter(deadline: DispatchTime, execute: DispatchWorkItem) {
__dispatch_after(deadline.rawValue, self, execute._block)
}
@available(OSX 10.10, iOS 8.0, *)
public func asyncAfter(wallDeadline: DispatchWallTime, execute: DispatchWorkItem) {
__dispatch_after(wallDeadline.rawValue, self, execute._block)
}
@available(OSX 10.10, iOS 8.0, *)
public var qos: DispatchQoS {
var relPri: Int32 = 0
let cls = DispatchQoS.QoSClass(rawValue: __dispatch_queue_get_qos_class(self, &relPri))!
return DispatchQoS(qosClass: cls, relativePriority: Int(relPri))
}
public func getSpecific<T>(key: DispatchSpecificKey<T>) -> T? {
let k = Unmanaged.passUnretained(key).toOpaque()
if let p = __dispatch_queue_get_specific(self, k) {
let v = Unmanaged<_DispatchSpecificValue<T>>
.fromOpaque(p)
.takeUnretainedValue()
return v.value
}
return nil
}
public func setSpecific<T>(key: DispatchSpecificKey<T>, value: T) {
let v = _DispatchSpecificValue(value: value)
let k = Unmanaged.passUnretained(key).toOpaque()
let p = Unmanaged.passRetained(v).toOpaque()
__dispatch_queue_set_specific(self, k, p, _destructDispatchSpecificValue)
}
}
private func _destructDispatchSpecificValue(ptr: UnsafeMutablePointer<Void>?) {
if let p = ptr {
Unmanaged<AnyObject>.fromOpaque(p).release()
}
}
@_silgen_name("_swift_dispatch_queue_concurrent")
internal func _swift_dispatch_queue_concurrent() -> __OS_dispatch_queue_attr
@_silgen_name("_swift_dispatch_get_main_queue")
internal func _swift_dispatch_get_main_queue() -> DispatchQueue
@_silgen_name("_swift_dispatch_apply_current_root_queue")
internal func _swift_dispatch_apply_current_root_queue() -> DispatchQueue