pthread_create 快速示例 [英] pthread_create swift sample

问题描述

由于我需要将应用程序从 C 移植到 Swift，我想知道是否有任何关于在 Swift 上使用 pthread_create 和 pthread_join 的示例.我知道通常我们必须使用 NSThreads 或 GCD，但在这种情况下，我需要使应用程序代码尽可能接近 C 应用程序.任何人都可以在这里举个例子吗?顺便说一下，要调用的函数是 Swift 函数，而不是 C 函数

Due to I need to port an application from C to Swift I would like to know if there is any sample about using pthread_create, and pthread_join on Swift. I know that usually we have to use NSThreads or the GCD but in this case I need to keep the application code the closest possible to the C application. Can anyone put an example here? By the way, the function to be called is a Swift function, not a C function

推荐答案

也遇到了这个问题.这是下面的简短示例.希望它能进一步帮助别人:

Faced the problem too. Here is short sample below. Hope it help someone further:

Swift 4

class ThreadContext {

    var someValue: String = "Some value"
}

func doSomething(pointer: UnsafeMutableRawPointer) -> UnsafeMutableRawPointer? {

    let pContext = pointer.bindMemory(to: ThreadContext.self, capacity: 1)
    print("Hello world: \(pContext.pointee.someValue)")

    return nil
}

var attibutes = UnsafeMutablePointer<pthread_attr_t>.allocate(capacity: 1)
guard 0 == pthread_attr_init(attibutes) else {

    fatalError("unable to initialize attributes")
}

defer {

    pthread_attr_destroy(attibutes)
}

guard 0 == pthread_attr_setdetachstate(attibutes, PTHREAD_CREATE_JOINABLE) else {

    fatalError("unable to set detach state")
}

let pContext = UnsafeMutablePointer<ThreadContext>.allocate(capacity: 1)
var context = ThreadContext()
pContext.pointee = context

var thread: pthread_t? = nil
let result = pthread_create(&thread, attibutes, doSomething, pContext)

guard result == 0, let thread = thread else {

    fatalError("unable to start pthread")
}

pthread_join(thread, nil)

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