time.sleep 不适用于多线程

Question

当我发现 time.sleep() 没有挂起运行 pywin32 模块的线程时，我试图对 code for "Suspend / Hibernate pc with python" provided by Ronan Paixão 进行多线程处理。

>>> 警告！以下代码将使 Windows 进入睡眠状态 <<<

def suspend(buffer, hibernate=False):
    '''Puts Windows to Suspend/Sleep/Standby or Hibernate.

    Parameters
    ----------
    buffer: string, for time.sleep()
    hibernate: bool, default False
        If False (default), system will enter Suspend/Sleep/Standby state.
        If True, system will Hibernate, but only if Hibernate is enabled in the
        system settings. If it's not, system will Sleep.

    Example:
    --------
    >>> suspend()
    '''
    print('before sleep') 
    sleep(float(buffer))
    print('after sleep')
    # Enable the SeShutdown privilege (which must be present in your
    # token in the first place)
    priv_flags = (win32security.TOKEN_ADJUST_PRIVILEGES |
                  win32security.TOKEN_QUERY)
    hToken = win32security.OpenProcessToken(
        win32api.GetCurrentProcess(),
        priv_flags
    )
    priv_id = win32security.LookupPrivilegeValue(
        None,
        win32security.SE_SHUTDOWN_NAME
    )
    old_privs = win32security.AdjustTokenPrivileges(
        hToken,
        0,
        [(priv_id, win32security.SE_PRIVILEGE_ENABLED)]
    )

    if (win32api.GetPwrCapabilities()['HiberFilePresent'] == False and
            hibernate == True):
        import warnings
        warnings.warn("Hibernate isn't available. Suspending.")
    try:
        windll.powrprof.SetSuspendState(not hibernate, True, False)
    except:
        # True=> Standby; False=> Hibernate
        # https://msdn.microsoft.com/pt-br/library/windows/desktop/aa373206(v=vs.85).aspx
        # says the second parameter has no effect.
        #        ctypes.windll.kernel32.SetSystemPowerState(not hibernate, True)
        win32api.SetSystemPowerState(not hibernate, True)

    # Restore previous privileges
    win32security.AdjustTokenPrivileges(
        hToken,
        0,
        old_privs
    )


if __name__ == '__main__':
    Thread(target=suspend, args=("10")).start()

print 函数确实等待 time.sleep()，但 Windows 立即进入休眠状态。发生什么事了？

Answer 1

您在 Thread 的调用中错误地传递了缓冲区参数，因此它只 sleeping 了 1.0 秒。您需要在 args 关键字参数的值末尾添加逗号 ,，如下所示：

.
.
if __name__ == '__main__':
    Thread(target=suspend, args=("10",)).start()

time.sleep 不适用于多线程

time.sleep does not work for multithreaded

python

multithreading

sleep

pywin32

python-multithreading