Rationale

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## Rationale

#### No inline-assembler

Some newer compiler (for instance MSVC 10 for x86_64 and itanium) do not support inline assembler. [1]. Inlined assembler generates code bloating which is not welcome on embedded systems.

#### fcontext_t

Boost.Context provides the low level API fcontext_t which is implemented in assembler to provide context swapping operations. fcontext_t is the part to port to new platforms.

| Note
Context switches do not preserve the signal mask on UNIX systems.

fcontext_t is an opaque pointer.

[1] MSDN article 'Inline Assembler'