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* Add getcontext, setcontext, and swapcontext as system calls.deischen2002-11-161-0/+134
Previously these were libc functions but were requested to be made into system calls for atomicity and to coalesce what might be two entrances into the kernel (signal mask setting and floating point trap) into one. A few style nits and comments from bde are also included. Tested on alpha by: gallatin
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