* R0 = Thread handle (or NUL)
* R0 ! Context (or boolean)
Notes: Gets a pointer to a thread's context, given a thread handle. The form of the context is document, in C-style syntax, in ThreadLib.h.Thread. The main use of this call is to examine a thread's register set, and allow reading and writing of it's private word (a user-supplied value unique to each thread).
If, however, R0 is NUL on entry, R0 will contain, on exit, a boolean dictating whether or not the task is currently single-threaded (note, in this case, single threaded means all threads are disabled not that there is only one thread running).
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