pthread_create swift sample

Question

由於我需要將應用程序從C移植到Swift，我想知道是否有任何關於在Swift上使用pthread_create和pthread_join的示例。我知道通常我們必須使用NSThreads或GCD，但在這種情況下，我需要保持應用程序代碼儘可能接近C應用程序。 任何人都可以在這裏舉個例子嗎？ 順便說一下，要調用的函數是一個Swift函數，而不是C函數

Answer 1

也面臨這個問題。下面是簡短的示例。希望它可以幫助別人進一步：

斯威夫特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)