utils.hpp File Reference

Provides namespace utils. More...

#include "config.hpp"
#include "../boost-lite/include/algorithm/string.hpp"

Classes
class	boost::afio::v2_xxx::utils::page_allocator< T >
	An STL allocator which allocates large TLB page memory.If the operating system is configured to allow it, this type of memory is particularly efficient for doing large scale file i/o. This is because the kernel must normally convert the scatter gather buffers you pass into extended scatter gather buffers as the memory you see as contiguous may not, and probably isn't, actually be contiguous in physical memory. Regions returned by this allocator may be allocated contiguously in physical memory and therefore the kernel can pass through your scatter gather buffers unmodified. More...
struct	boost::afio::v2_xxx::utils::page_allocator< T >::rebind< U >
class	boost::afio::v2_xxx::utils::page_allocator< void >
struct	boost::afio::v2_xxx::utils::page_allocator< void >::rebind< U >

Namespaces
namespace	boost
	The Boost namespace.
namespace	boost::afio
	The AFIO namespace.
namespace	boost::afio::v2_xxx
	Inline namespace for this version of AFIO.
namespace	boost::afio::v2_xxx::utils
	Utility routines often useful when using AFIO.

Functions
size_t	boost::afio::v2_xxx::utils::page_size () noexcept
	Returns the smallest page size of this architecture which is useful for calculating direct i/o multiples. More...
template<class T >
T	boost::afio::v2_xxx::utils::round_down_to_page_size (T i) noexcept
	Round a value to its next lowest page size multiple.
template<class T >
T	boost::afio::v2_xxx::utils::round_up_to_page_size (T i) noexcept
	Round a value to its next highest page size multiple.
template<class T >
std::pair< T *, size_t >	boost::afio::v2_xxx::utils::round_to_page_size (std::pair< T *, size_t > i) noexcept
	Round a pair of a pointer and a size_t to their nearest page size multiples. The pointer will be rounded down, the size_t upwards.
std::vector< size_t >	boost::afio::v2_xxx::utils::page_sizes (bool only_actually_available=true)
	Returns the page sizes of this architecture which is useful for calculating direct i/o multiples. More...
size_t	boost::afio::v2_xxx::utils::file_buffer_default_size () noexcept
	Returns a reasonable default size for page_allocator, typically the closest page size from page_sizes() to 1Mb. More...
void	boost::afio::v2_xxx::utils::random_fill (char *buffer, size_t bytes)
	Fills the buffer supplied with cryptographically strong randomness. Uses the OS kernel API. More...
std::string	boost::afio::v2_xxx::utils::random_string (size_t randomlen)
	Returns a cryptographically random string capable of being used as a filename. Essentially random_fill() + to_hex_string(). More...
large_page_allocation	boost::afio::v2_xxx::utils::detail::calculate_large_page_allocation (size_t bytes)
large_page_allocation	boost::afio::v2_xxx::utils::detail::allocate_large_pages (size_t bytes)
void	boost::afio::v2_xxx::utils::detail::deallocate_large_pages (void *p, size_t bytes)
template<class T , class U >
bool	boost::afio::v2_xxx::utils::operator== (const page_allocator< T > &, const page_allocator< U > &) noexcept

Detailed Description

Provides namespace utils.