-
Notifications
You must be signed in to change notification settings - Fork 459
/
Queue.swift
497 lines (451 loc) · 17.3 KB
/
Queue.swift
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
//===----------------------------------------------------------------------===//
//
// 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 https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
// dispatch/queue.h
import CDispatch
@_implementationOnly import _DispatchOverlayShims
public final class DispatchSpecificKey<T> {
public init() {}
}
internal class _DispatchSpecificValue<T> {
internal let value: T
internal init(value: T) { self.value = value }
}
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(macOS 10.12, iOS 10.0, tvOS 10.0, watchOS 3.0, *)
public static let initiallyInactive = Attributes(rawValue: 1<<2)
fileprivate func _attr() -> dispatch_queue_attr_t? {
var attr: dispatch_queue_attr_t? = nil
if self.contains(.concurrent) {
attr = _swift_dispatch_queue_concurrent()
}
if #available(macOS 10.12, iOS 10.0, tvOS 10.0, watchOS 3.0, *) {
if self.contains(.initiallyInactive) {
attr = CDispatch.dispatch_queue_attr_make_initially_inactive(attr)
}
}
return attr
}
}
public enum GlobalQueuePriority {
@available(macOS, deprecated: 10.10, message: "Use qos attributes instead")
@available(iOS, deprecated: 8.0, message: "Use qos attributes instead")
@available(tvOS, deprecated, message: "Use qos attributes instead")
@available(watchOS, deprecated, message: "Use qos attributes instead")
case high
@available(macOS, deprecated: 10.10, message: "Use qos attributes instead")
@available(iOS, deprecated: 8.0, message: "Use qos attributes instead")
@available(tvOS, deprecated, message: "Use qos attributes instead")
@available(watchOS, deprecated, message: "Use qos attributes instead")
case `default`
@available(macOS, deprecated: 10.10, message: "Use qos attributes instead")
@available(iOS, deprecated: 8.0, message: "Use qos attributes instead")
@available(tvOS, deprecated, message: "Use qos attributes instead")
@available(watchOS, deprecated, message: "Use qos attributes instead")
case low
@available(macOS, deprecated: 10.10, message: "Use qos attributes instead")
@available(iOS, deprecated: 8.0, message: "Use qos attributes instead")
@available(tvOS, deprecated, message: "Use qos attributes instead")
@available(watchOS, deprecated, 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(macOS 10.12, iOS 10.0, tvOS 10.0, watchOS 3.0, *)
case workItem
@available(macOS 10.12, iOS 10.0, tvOS 10.0, watchOS 3.0, *)
case never
internal func _attr(attr: dispatch_queue_attr_t?) -> dispatch_queue_attr_t? {
if #available(macOS 10.12, iOS 10.0, tvOS 10.0, watchOS 3.0, *) {
switch self {
case .inherit:
// DISPATCH_AUTORELEASE_FREQUENCY_INHERIT
return CDispatch.dispatch_queue_attr_make_with_autorelease_frequency(attr, dispatch_autorelease_frequency_t(0))
case .workItem:
// DISPATCH_AUTORELEASE_FREQUENCY_WORK_ITEM
return CDispatch.dispatch_queue_attr_make_with_autorelease_frequency(attr, dispatch_autorelease_frequency_t(1))
case .never:
// DISPATCH_AUTORELEASE_FREQUENCY_NEVER
return CDispatch.dispatch_queue_attr_make_with_autorelease_frequency(attr, dispatch_autorelease_frequency_t(2))
}
} else {
return attr
}
}
}
public class func concurrentPerform(iterations: Int, execute work: (Int) -> Void) {
_swift_dispatch_apply_current(iterations, work)
}
public class var main: DispatchQueue {
return DispatchQueue(queue: _swift_dispatch_get_main_queue())
}
@available(macOS, deprecated: 10.10, message: "")
@available(iOS, deprecated: 8.0, message: "")
@available(tvOS, deprecated, message: "")
@available(watchOS, deprecated, message: "")
public class func global(priority: GlobalQueuePriority) -> DispatchQueue {
return DispatchQueue(queue: CDispatch.dispatch_get_global_queue(Int(priority._translatedValue), 0))
}
@available(macOS 10.10, iOS 8.0, *)
public class func global(qos: DispatchQoS.QoSClass = .default) -> DispatchQueue {
return DispatchQueue(queue: CDispatch.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 = CDispatch.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(macOS 10.10, iOS 8.0, *), qos != .unspecified {
attr = CDispatch.dispatch_queue_attr_make_with_qos_class(attr, qos.qosClass.rawValue.rawValue, Int32(qos.relativePriority))
}
if #available(macOS 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.__wrapped))!
}
///
/// Submits a block for synchronous execution on this queue.
///
/// Submits a work item to a dispatch queue like `async(execute:)`, however
/// `sync(execute:)` will not return until the work item has finished.
///
/// Work items submitted to a queue with `sync(execute:)` do not observe certain
/// queue attributes of that queue when invoked (such as autorelease frequency
/// and QoS class).
///
/// Calls to `sync(execute:)` targeting the current queue will result
/// in deadlock. Use of `sync(execute:)` is also subject to the same
/// multi-party deadlock problems that may result from the use of a mutex.
/// Use of `async(execute:)` is preferred.
///
/// As an optimization, `sync(execute:)` invokes the work item on the thread which
/// submitted it, except when the queue is the main queue or
/// a queue targetting it.
///
/// - parameter execute: The work item to be invoked on the queue.
/// - SeeAlso: `async(execute:)`
///
@available(macOS 10.10, iOS 8.0, *)
public func sync(execute workItem: DispatchWorkItem) {
CDispatch.dispatch_sync(self.__wrapped, workItem._block)
}
///
/// Submits a work item for asynchronous execution on a dispatch queue.
///
/// `async(execute:)` is the fundamental mechanism for submitting
/// work items to a dispatch queue.
///
/// Calls to `async(execute:)` always return immediately after the work item has
/// been submitted, and never wait for the work item to be invoked.
///
/// The target queue determines whether the work item will be invoked serially or
/// concurrently with respect to other work items submitted to that same queue.
/// Serial queues are processed concurrently with respect to each other.
///
/// - parameter execute: The work item to be invoked on the queue.
/// - SeeAlso: `sync(execute:)`
///
@available(macOS 10.10, iOS 8.0, *)
public func async(execute workItem: DispatchWorkItem) {
CDispatch.dispatch_async(self.__wrapped, workItem._block)
}
///
/// Submits a work item to a dispatch queue and associates it with the given
/// dispatch group. The dispatch group may be used to wait for the completion
/// of the work items it references.
///
/// - parameter group: the dispatch group to associate with the submitted block.
/// - parameter execute: The work item to be invoked on the queue.
/// - SeeAlso: `sync(execute:)`
///
@available(macOS 10.10, iOS 8.0, *)
public func async(group: DispatchGroup, execute workItem: DispatchWorkItem) {
CDispatch.dispatch_group_async(group.__wrapped, self.__wrapped, workItem._block)
}
///
/// Submits a work item to a dispatch queue and optionally associates it with a
/// dispatch group. The dispatch group may be used to wait for the completion
/// of the work items it references.
///
/// - parameter group: the dispatch group to associate with the submitted
/// work item. If this is `nil`, the work item is not associated with a group.
/// - parameter qos: the QoS at which the work item should be executed.
/// Defaults to `DispatchQoS.unspecified`.
/// - parameter flags: flags that control the execution environment of the
/// work item.
/// - parameter execute: The work item to be invoked on the queue.
/// - SeeAlso: `sync(execute:)`
/// - SeeAlso: `DispatchQoS`
/// - SeeAlso: `DispatchWorkItemFlags`
///
public func async(
group: DispatchGroup? = nil,
qos: DispatchQoS = .unspecified,
flags: DispatchWorkItemFlags = [],
execute work: @escaping @Sendable @convention(block) () -> Void)
{
if group == nil && qos == .unspecified {
// Fast-path route for the most common API usage
if flags.isEmpty {
CDispatch.dispatch_async(self.__wrapped, work)
return
} else if flags == .barrier {
CDispatch.dispatch_barrier_async(self.__wrapped, work)
return
}
}
var block: @convention(block) () -> Void = work
if #available(macOS 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 {
CDispatch.dispatch_group_async(g.__wrapped, self.__wrapped, block)
} else {
CDispatch.dispatch_async(self.__wrapped, block)
}
}
private func _syncBarrier(block: () -> ()) {
CDispatch.dispatch_barrier_sync(self.__wrapped, block)
}
private func _syncHelper<T>(
fn: (() -> ()) -> (),
execute work: () throws -> T,
rescue: ((Swift.Error) throws -> (T))) rethrows -> T
{
var result: T?
var error: Swift.Error?
withoutActuallyEscaping(work) { _work in
fn {
do {
result = try _work()
} catch let e {
error = e
}
}
}
if let e = error {
return try rescue(e)
} else {
return result!
}
}
@available(macOS 10.10, iOS 8.0, *)
private func _syncHelper<T>(
fn: (DispatchWorkItem) -> (),
flags: DispatchWorkItemFlags,
execute work: () throws -> T,
rescue: @escaping ((Swift.Error) throws -> (T))) rethrows -> T
{
var result: T?
var error: Swift.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!
}
}
///
/// Submits a block for synchronous execution on this queue.
///
/// Submits a work item to a dispatch queue like `sync(execute:)`, and returns
/// the value, of type `T`, returned by that work item.
///
/// - parameter execute: The work item to be invoked on the queue.
/// - returns the value returned by the work item.
/// - SeeAlso: `sync(execute:)`
///
public func sync<T>(execute work: () throws -> T) rethrows -> T {
return try self._syncHelper(fn: sync, execute: work, rescue: { throw $0 })
}
///
/// Submits a block for synchronous execution on this queue.
///
/// Submits a work item to a dispatch queue like `sync(execute:)`, and returns
/// the value, of type `T`, returned by that work item.
///
/// - parameter flags: flags that control the execution environment of the
/// - parameter execute: The work item to be invoked on the queue.
/// - returns the value returned by the work item.
/// - SeeAlso: `sync(execute:)`
/// - SeeAlso: `DispatchWorkItemFlags`
///
public func sync<T>(flags: DispatchWorkItemFlags, execute work: () throws -> T) rethrows -> T {
if flags == .barrier {
return try self._syncHelper(fn: _syncBarrier, execute: work, rescue: { throw $0 })
} else if #available(macOS 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 })
}
}
///
/// Submits a work item to a dispatch queue for asynchronous execution after
/// a specified time.
///
/// - parameter deadline: the time after which the work item should be executed,
/// given as a `DispatchTime`.
/// - parameter qos: the QoS at which the work item should be executed.
/// Defaults to `DispatchQoS.unspecified`.
/// - parameter flags: flags that control the execution environment of the
/// work item.
/// - parameter execute: The work item to be invoked on the queue.
/// - SeeAlso: `async(execute:)`
/// - SeeAlso: `asyncAfter(deadline:execute:)`
/// - SeeAlso: `DispatchQoS`
/// - SeeAlso: `DispatchWorkItemFlags`
/// - SeeAlso: `DispatchTime`
///
public func asyncAfter(
deadline: DispatchTime,
qos: DispatchQoS = .unspecified,
flags: DispatchWorkItemFlags = [],
execute work: @escaping @Sendable @convention(block) () -> Void)
{
if #available(macOS 10.10, iOS 8.0, *), qos != .unspecified || !flags.isEmpty {
let item = DispatchWorkItem(qos: qos, flags: flags, block: work)
CDispatch.dispatch_after(deadline.rawValue, self.__wrapped, item._block)
} else {
CDispatch.dispatch_after(deadline.rawValue, self.__wrapped, work)
}
}
///
/// Submits a work item to a dispatch queue for asynchronous execution after
/// a specified time.
///
/// - parameter deadline: the time after which the work item should be executed,
/// given as a `DispatchWallTime`.
/// - parameter qos: the QoS at which the work item should be executed.
/// Defaults to `DispatchQoS.unspecified`.
/// - parameter flags: flags that control the execution environment of the
/// work item.
/// - parameter execute: The work item to be invoked on the queue.
/// - SeeAlso: `async(execute:)`
/// - SeeAlso: `asyncAfter(wallDeadline:execute:)`
/// - SeeAlso: `DispatchQoS`
/// - SeeAlso: `DispatchWorkItemFlags`
/// - SeeAlso: `DispatchWallTime`
///
public func asyncAfter(
wallDeadline: DispatchWallTime,
qos: DispatchQoS = .unspecified,
flags: DispatchWorkItemFlags = [],
execute work: @escaping @Sendable @convention(block) () -> Void)
{
if #available(macOS 10.10, iOS 8.0, *), qos != .unspecified || !flags.isEmpty {
let item = DispatchWorkItem(qos: qos, flags: flags, block: work)
CDispatch.dispatch_after(wallDeadline.rawValue, self.__wrapped, item._block)
} else {
CDispatch.dispatch_after(wallDeadline.rawValue, self.__wrapped, work)
}
}
///
/// Submits a work item to a dispatch queue for asynchronous execution after
/// a specified time.
///
/// - parameter deadline: the time after which the work item should be executed,
/// given as a `DispatchTime`.
/// - parameter execute: The work item to be invoked on the queue.
/// - SeeAlso: `asyncAfter(deadline:qos:flags:execute:)`
/// - SeeAlso: `DispatchTime`
///
@available(macOS 10.10, iOS 8.0, *)
public func asyncAfter(deadline: DispatchTime, execute: DispatchWorkItem) {
CDispatch.dispatch_after(deadline.rawValue, self.__wrapped, execute._block)
}
///
/// Submits a work item to a dispatch queue for asynchronous execution after
/// a specified time.
///
/// - parameter deadline: the time after which the work item should be executed,
/// given as a `DispatchWallTime`.
/// - parameter execute: The work item to be invoked on the queue.
/// - SeeAlso: `asyncAfter(wallDeadline:qos:flags:execute:)`
/// - SeeAlso: `DispatchTime`
///
@available(macOS 10.10, iOS 8.0, *)
public func asyncAfter(wallDeadline: DispatchWallTime, execute: DispatchWorkItem) {
CDispatch.dispatch_after(wallDeadline.rawValue, self.__wrapped, execute._block)
}
@available(macOS 10.10, iOS 8.0, *)
public var qos: DispatchQoS {
var relPri: Int32 = 0
let cls = DispatchQoS.QoSClass(rawValue: _OSQoSClass(qosClass: dispatch_queue_get_qos_class(self.__wrapped, &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.__wrapped, k) {
let v = Unmanaged<_DispatchSpecificValue<T>>
.fromOpaque(p)
.takeUnretainedValue()
return v.value
}
return nil
}
public func setSpecific<T>(key: DispatchSpecificKey<T>, value: T?) {
let k = Unmanaged.passUnretained(key).toOpaque()
let v = value.map { _DispatchSpecificValue(value: $0) }
let p = v.map { Unmanaged.passRetained($0).toOpaque() }
dispatch_queue_set_specific(self.__wrapped, k, p, _destructDispatchSpecificValue)
}
#if os(Android)
public static func setThreadDetachCallback(_ cb: @escaping @convention(c) () -> Void) {
_dispatch_install_thread_detach_callback(cb)
}
#endif
}
private func _destructDispatchSpecificValue(ptr: UnsafeMutableRawPointer?) {
if let p = ptr {
Unmanaged<AnyObject>.fromOpaque(p).release()
}
}