问题
Is there some additional configuration needed before I can set thread priorities in a Windows service?
In my service, I have a few threads that each call the CreateProcess() function to launch an external application. I would like to adjust thread (or process) priorities to normal or lower, depending on some other factors.
The problem is that SetThreadPriority() function fails with an error 6 (invalid handle?). I'm passing in a handle obtained from PROCESS_INFORMATION::hThread (after calling the CreateProcess() of course), so I think that the handle should be valid.
I've also tried setting the priority on the processes using the SetPriorityClass() function, which also fails.
The service is logged on as a local user.
回答1:
Maybe you don't have the correct access rights? MSDN on SetThreadPriority says:
hThread [in] A handle to the thread whose priority value is to be set.
The handle must have the THREAD_SET_INFORMATION or THREAD_SET_LIMITED_INFORMATION access right. For more information, see Thread Security and Access Rights.
Windows Server 2003 and Windows XP/2000: The handle must have the THREAD_SET_INFORMATION access right.
来源：https://stackoverflow.com/questions/239160/setting-a-thread-priority-in-a-service-has-no-effect