yxztj

import UIKit
import PlaygroundSupport

let paragraph = NSMutableParagraphStyle()
paragraph.lineSpacing = 20

// the issue won't report with PingFangSC-Regular font
//let font = UIFont(name: "PingFangSC-Regular", size: 18)!
// setting to ".SFUIText" would lead to reproductive
let font = UIFont(name: ".SFUIText", size: 18)!

yxztj

import UIKit

private var imp = pthread_rwlock_t()

func wlock(_ time: Int) {
    pthread_rwlock_wrlock(&imp)
    print("[\(time)]wlock")
}

func rlock(_ time: Int) {

yxztj

原文链接：https://gist.github.com/lattner/31ed37682ef1576b16bca1432ea9f782

Swift 并发宣言

作者: Chris Lattner

内容

• 介绍
• 总的愿景