[boost] [context] for Mac OS X (and other platforms) via libtask

Subject: [boost] [context] for Mac OS X (and other platforms) via libtask
From: Daniel Larimer (dlarimer_at_[hidden])
Date: 2011-02-06 09:14:30

I have put some code up on github that uses libtask's implementation of asm based context switching as a backend implementation of boost::context.  I have verified that it allows me to use Boost.Fiber on Mac OS X.   I suspect that my changes would allow Boost.Context to work with arm, power pc, and any other platform supported by libtask.

The protected_stack allocator does not seem to work on OS X,  so I switched to using malloc/free.  I wonder if this is the reason why the ucontext implementation was not working on OS X either.   Considering ucontext on Mac OS X is deprecated and asm 100x faster, I am not sure it is worth while to get the ucontext implementation working. 

I suspect that the correct solution would be to modify the code in libs/context/src/libtask to implement the fcontext pattern, but I have no experience with asm. 

https://github.com/bytemaster/boost_context_osx/tree/master/libs/context/src