[boost] [context] user-context switching

Subject: [boost] [context] user-context switching
From: Oliver Kowalke (k-oli_at_[hidden])
Date: 2010-07-27 17:33:00

I've moved the context switching code from boost.fiber into a new lib - 
boost.context (uploaded to boost vault).
The lib contains assembler for some platforms: i386, x86_64 and arm 
(aapcs-linux only).
It could be used for code implementing cooperative scheduling (such as 
boost.coroutine and boost.fiber).

Oliver