Thread Functions for Debugging
The CreateThread function creates a new thread for a process. Debuggers typically need to examine or change the contents of a thread's registers. To accomplish this, a debugger must obtain a handle to the thread by using the DuplicateHandle function and specifying the appropriate access to the thread (THREAD_GET_CONTEXT, THREAD_SET_CONTEXT, or both). The OpenThread function enables a debugger to obtain the identifier of an existing thread.
A process with appropriate access to a thread can examine the thread's registers by using the GetThreadContext function and set the contents of the thread's registers by using the SetThreadContext function.
A process can also obtain THREAD_SUSPEND_RESUME access to a thread. This type of access enables a debugger to control a thread's execution with the SuspendThread and ResumeThread functions. For more information about threads, see Processes and Threads.