Boost C++ Libraries

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Stack allocation

Class protected_stack_allocator
Class standard_stack_allocator
Class segmented_stack_allocator
Class stack_traits
Class stack_context

A coroutine uses internally a context which manages a set of registers and a stack. The memory used by the stack is allocated/deallocated via a stack-allocator which is required to model a stack-allocator concept.

stack-allocator concept

A stack-allocator must satisfy the stack-allocator concept requirements shown in the following table, in which a is an object of a stack-allocator type, sctx is a stack_context, and size is a std::size_t:

expression

return type

notes

a.allocate( sctx, size)

void

creates a stack of at least size bytes and stores its pointer and length in sctx

a.deallocate( sctx)

void

deallocates the stack created by a.allocate()

[Important] Important

The implementation of allocate() might include logic to protect against exceeding the context's available stack size rather than leaving it as undefined behaviour.

[Important] Important

Calling deallocate() with a stack_context not set by allocate() results in undefined behaviour.

[Note] Note

The stack is not required to be aligned; alignment takes place inside coroutine.

[Note] Note

Depending on the architecture allocate() stores an address from the top of the stack (growing downwards) or the bottom of the stack (growing upwards).

class stack_allocator is a typedef of standard_stack_allocator.


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