Multithreaded spend CPU 100%

[wisconxing]

I run C++ GUI Qt 4 programing（Editor 2）14th Multithreaded example Threads, found when a thread started, the CPU be ueed up 100% performance. It may be caused in thread::run() while loop. How to reduce the CPU spending? The Thread::run() see below:

void Thread::run()
{
    while (!stopped)
        printf("%s",&messageStr);
    std::cerr << qPrintable(messageStr);
    stopped = false;
    std::cerr << std::endl;
}

void Thread::run()
{
    while (!stopped)
        printf("%s",&messageStr);
    std::cerr << qPrintable(messageStr);
    stopped = false;
    std::cerr << std::endl;
}

To copy to clipboard, switch view to plain text mode