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Boost.Coroutine provides the class protected_stack_allocator which models the stack-allocator concept. It appends a guard page at the end of each stack to protect against exceeding the stack. If the guard page is accessed (read or write operation) a segmentation fault/access violation is generated by the operating system.
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Important |
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Using protected_stack_allocator is expensive. That is, launching a new coroutine with a new stack is expensive; the allocated stack is just as efficient to use as any other stack. |
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Note |
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The appended |
#include <boost/coroutine/protected_stack_allocator.hpp> template< typename traitsT > struct basic_protected_stack_allocator { typedef traitT traits_type; void allocate( stack_context &, std::size_t size); void deallocate( stack_context &); } typedef basic_protected_stack_allocator< stack_traits > protected_stack_allocator
void allocate( stack_context
& sctx, std::size_t size)
traits_type::minimum_size()
<= size
and ! traits_type::is_unbounded() &&
( traits_type::maximum_size() >= size)
.
Allocates memory of at least size
bytes and stores a pointer to the stack and its actual size in sctx
. Depending on the architecture
(the stack grows downwards/upwards) the stored address is the highest/lowest
address of the stack.
void deallocate( stack_context
& sctx)
sctx.sp
is valid, traits_type::minimum_size() <= sctx.size
and !
traits_type::is_unbounded()
&& (
traits_type::maximum_size()
>= sctx.size)
.
Deallocates the stack space.