QThread是否为分离线程运行呢？

// qt-everywhere-src-5.12.1\qtbase\src\corelib\thread\qthread_unix.cpp
void QThread::start(Priority priority)
{
    ...
    pthread_attr_t attr;
    pthread_attr_init(&attr);
    pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
    ...
}

// qt-everywhere-src-5.12.1\qtbase\src\corelib\thread\qthread_win.cpp
void QThread::start(Priority priority)
{
    ...
    // MSVC -MD or -MDd or MinGW build
    d->handle = CreateThread(nullptr, d->stackSize,
                             reinterpret_cast<LPTHREAD_START_ROUTINE>(QThreadPrivate::start),
                             this, CREATE_SUSPENDED, reinterpret_cast<LPDWORD>(&d->id));
    ...
}