有一个已创建的线程，或在必要时创建线程(Have an already created thread at all time or create the thread when necessary)

 我正在使用用于小型USB设备的用户模式驱动程序。 我的usb读取循环应该非常敏感，它执行的操作应该非常小（不一定是原子的）。 就像内核模式驱动程序中的中断服务程序一样。 在一个处理中，我需要创建一个线程并将一些参数传递给该读取循环内的该线程。 
 
 所以我需要知道该操作的确切上限。 它不会超过200毫秒，或类似的东西。 
 
 下一个选择是在设备初始化时间（探测时间）进行线程初始化，然后休眠该线程，直到我从读取线程发出信号。 但在这种情况下，线程始终在运行，而且成本很高。 
 
 什么是最好的选择？ 我的平台是linux，他们说在linux中，线程创建的操作非常短。 我需要决定什么是最好的。 保持线程始终处于活动状态或在必要时创建线程。 

I'm working with a user mode driver for small scale USB devices. My usb reading loop should be very responsive and operations it performs should be very small ( not necessary to be atomic). Like an interrupt service routine in a kernel mode driver. In one processing I need to create a thread and pass some parameters to that thread inside that reading loop. 
 
So I need to know the exact upper limit of that operation. It will not take more than 200mS , or something like that. 
 
Next alternative is to do the thread initialization at the device initialization time ( probing time ) and then sleep that thread waiting till I signal it from the reading thread. But in this scenario the thread is always running and it would be costly. 
 
What is the best option ? My platform is linux, and they said in linux, thread creation have very short operation. I need to decide what is best. Keep the thread alive at all-time or create the thread when necessary.

原文：https://stackoverflow.com/questions/43780187