QThread的多個實例是否可以引用相同的OS線程？

Question

我使用QThread作爲線程管理器，我想知道是否可以實例化所有管理同一線程的多個QThread對象？

Answer 1

不，當然。

單個線程只能由1 QThread的管理，因爲它會被裏面void QThread::start(Priority)內部創建，也就是noway設置線程QThread

從qthread_unix.cpp

int code = pthread_create(&threadId, &attr, QThreadPrivate::start, this); 

pthread_create將啓動新線程。

從qthread_win.cpp

#if defined(Q_CC_MSVC) && !defined(_DLL) // && !defined(Q_OS_WINRT) 
# ifdef Q_OS_WINRT 
    // If you wish to accept the memory leaks, uncomment the part above. 
    // See: 
    // https://support.microsoft.com/en-us/kb/104641 
    // https://msdn.microsoft.com/en-us/library/kdzttdcb.aspx 
# error "Microsoft documentation says this combination leaks memory every time a thread is started. " \ 
    "Please change your build back to -MD/-MDd or, if you understand this issue and want to continue, " \ 
    "edit this source file." 
# endif 
    // MSVC -MT or -MTd build 
    d->handle = (Qt::HANDLE) _beginthreadex(NULL, d->stackSize, QThreadPrivate::start, 
              this, CREATE_SUSPENDED, &(d->id)); 
#else 
    // MSVC -MD or -MDd or MinGW build 
    d->handle = (Qt::HANDLE) CreateThread(NULL, d->stackSize, (LPTHREAD_START_ROUTINE)QThreadPrivate::start, 
              this, CREATE_SUSPENDED, reinterpret_cast<LPDWORD>(&d->id)); 
#endif // Q_OS_WINRT 

兩個CreateThread和_beginthreadex將創建當然一個新的線程。