Swift

Thread Pool Size

See more Async Examples

Demonstrates how to set the maximum number of threads in Chilkat's thread pool manager. Also demonstrates how to set a thread pool log file for help in diagnosing unexpected problems. Swift

func chilkatTest() {
    var success: Bool = false

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    success = false

    // Set the maximum number of threads in the Chilkat thread pool to 12.
    // This means that no more than 12 background worker threads will exist simultaneously.
    // If more than 12 tasks are queued then some must wait for a worker thread to become free.
    // Note: The Chilkat thread pool manager thread is a thread distinct from the
    // worker threads.  It starts when the 1st asynchronous task is Run. 
    let glob = CkoGlobal()!
    glob.maxThreads = 12

    // Also, the ThreadPoolLogPath can be set to cause the thread pool manager thread to
    // keep a log file. This is for the purpose of debugging if unexpected problems occur.
    glob.threadPoolLogPath = "/home/users/chilkat/logs/threadPoolLog.txt"

    let http1 = CkoHttp()!
    let http2 = CkoHttp()!
    let http3 = CkoHttp()!

    var url1: String? = "http://www.marcusmiller.com/"
    var url2: String? = "http://www.tromboneshorty.com/"
    var url3: String? = "http://www.jamesmorrison.com/"

    // Call the async version of the QuickGetStr method to return a task object.
    // The task object is loaded, but is in the Inert state -- meaning it is
    // not yet scheduled to run on Chilkat's background thread pool.
    var task1: CkoTask? = http1.quickGetStrAsync(url: url1)
    if http1.lastMethodSuccess == false {
        print("\(http1.lastErrorText!)")
        return
    }

    var task2: CkoTask? = http2.quickGetStrAsync(url: url2)
    if http2.lastMethodSuccess == false {
        print("\(http2.lastErrorText!)")
        task1 = nil
        return
    }

    var task3: CkoTask? = http3.quickGetStrAsync(url: url3)
    if http3.lastMethodSuccess == false {
        print("\(http3.lastErrorText!)")
        task1 = nil
        task2 = nil
        return
    }

    // At this point we have 3 task objects, each loaded with a Chilkat method call.
    // Note: At this point no background threads are running.  The thread pool manager
    // thread is not started -- it will start when the very first task is Run.

    // Schedule each task for running on the thread pool.  This changes each task's state
    // from Inert to Live. The thread pool manager thread starts with the 1st task queued.
    // If the Global.ThreadPoolLogPath property was set, then
    // the log file would be created (or appended) at this point.
    success = task1!.run()
    // Assuming success for brevity...
    success = task2!.run()
    success = task3!.run()

    // The application is now free to do anything else
    // while the HTML at the URL's are being downloaded in background threads.

    // In this case, we'll just wait for all three tasks to finish.
    // All three tasks are running simultaneously in separate background threads.
    // We can wait for each in any order.  If Wait is called and the task has already
    // finished (or been canceled), then the Wait method returns immediately.
    var maxWaitMs: Int = 20000
    success = task1!.wait(maxWaitMs: maxWaitMs)
    success = task2!.wait(maxWaitMs: maxWaitMs)
    success = task3!.wait(maxWaitMs: maxWaitMs)
    // Assuming success for brevity...

    var err: String? = "Task failed or canceled"
    var html1: String? = err
    var html2: String? = err
    var html3: String? = err

    // Now get the HTML downloaded in each task:
    if (task1!.statusInt.intValue == 7) && (task1!.taskSuccess == true) {
        html1 = task1!.getResultString()
    }

    if (task2!.statusInt.intValue == 7) && (task2!.taskSuccess == true) {
        html2 = task2!.getResultString()
    }

    if (task3!.statusInt.intValue == 7) && (task3!.taskSuccess == true) {
        html3 = task3!.getResultString()
    }

    print("\(html1!)")
    print("----")
    print("\(html2!)")
    print("----")
    print("\(html3!)")
    print("----")

    task1 = nil
    task2 = nil
    task3 = nil

}