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RunLoopLock.swift
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RunLoopLock.swift
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//
// RunLoopLock.swift
// RxBlocking
//
// Created by Krunoslav Zaher on 11/5/15.
// Copyright © 2015 Krunoslav Zaher. All rights reserved.
//
import CoreFoundation
#if !RX_NO_MODULE
import RxSwift
#endif
#if os(Linux)
import Foundation
let runLoopMode: RunLoopMode = RunLoopMode.defaultRunLoopMode
let runLoopModeRaw: CFString = unsafeBitCast(runLoopMode.rawValue._bridgeToObjectiveC(), to: CFString.self)
#else
let runLoopMode: CFRunLoopMode = CFRunLoopMode.defaultMode
let runLoopModeRaw = runLoopMode.rawValue
#endif
final class RunLoopLock {
let _currentRunLoop: CFRunLoop
var _calledRun: AtomicInt = 0
var _calledStop: AtomicInt = 0
var _timeout: RxTimeInterval?
init(timeout: RxTimeInterval?) {
_timeout = timeout
_currentRunLoop = CFRunLoopGetCurrent()
}
func dispatch(_ action: @escaping () -> ()) {
CFRunLoopPerformBlock(_currentRunLoop, runLoopModeRaw) {
if CurrentThreadScheduler.isScheduleRequired {
_ = CurrentThreadScheduler.instance.schedule(()) { _ in
action()
return Disposables.create()
}
}
else {
action()
}
}
CFRunLoopWakeUp(_currentRunLoop)
}
func stop() {
if AtomicIncrement(&_calledStop) != 1 {
return
}
CFRunLoopPerformBlock(_currentRunLoop, runLoopModeRaw) {
CFRunLoopStop(self._currentRunLoop)
}
CFRunLoopWakeUp(_currentRunLoop)
}
func run() throws {
if AtomicIncrement(&_calledRun) != 1 {
fatalError("Run can be only called once")
}
if let timeout = _timeout {
#if os(Linux)
switch Int(CFRunLoopRunInMode(runLoopModeRaw, timeout, false)) {
case kCFRunLoopRunFinished:
return
case kCFRunLoopRunHandledSource:
return
case kCFRunLoopRunStopped:
return
case kCFRunLoopRunTimedOut:
throw RxError.timeout
default:
fatalError("This failed because `CFRunLoopRunResult` wasn't bridged to Swift.")
}
#else
switch CFRunLoopRunInMode(runLoopMode, timeout, false) {
case .finished:
return
case .handledSource:
return
case .stopped:
return
case .timedOut:
throw RxError.timeout
}
#endif
}
else {
CFRunLoopRun()
}
}
}