Io_page

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type buf = Cstruct.t

Type of a C buffer (in this case, a Cstruct)

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type t = (char, Bigarray.int8_unsigned_elt, Bigarray.c_layout) Bigarray.Array1.t

Type of memory blocks.

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val get : int -> t

get n allocates and returns a memory block of n pages. If there is not enough memory, an Out_of_memory exception is raised. Note that this may be a recoverable situation, since this function allocates memory from a page-aligned pool, whereas the OCaml garbage collector will be running in its own heap that may have spare memory despite the Out_of_memory being raised from this function call.

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val get_buf : ?n:int -> unit -> buf

get_buf n allocates and returns a memory block of n pages, represented as a Cstruct.t. If there is not enough memory, an Out_of_memory exception is raised.

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val get_order : int -> t

get_order i is get (1 lsl i).

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val pages : int -> t list

pages n allocates a memory block of n pages and return the list of pages allocated.

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val pages_order : int -> t list

pages_order i is pages (1 lsl i).

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val length : t -> int

length t is the size of t, in bytes.

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val to_cstruct : t -> buf

to_cstruct t generates a Cstruct.t that covers the entire Io_page.

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val to_string : t -> string

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val get_order : int -> t

get_order i is get (1 lsl i).

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val pages : int -> t list

pages n allocates a memory block of n pages and return the the list of pages allocated.

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val pages_order : int -> t list

pages_order i is pages (1 lsl i).

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val length : t -> int

length t is the size of t, in bytes.

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val to_cstruct : t -> buf

to_cstruct t generates a Cstruct.t that covers the entire Io_page.

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val to_string : t -> string

to_string t will allocate a fresh string and copy the contents of t into the string.

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val to_pages : t -> t list

to_pages t is a list of size memory blocks of one page each, where size is the size of t in pages.

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val string_blit : string -> int -> t -> int -> int -> unit

string_blit src srcoff dst dstoff len copies len bytes from string src, starting at byte number srcoff, to memory block dst, starting at byte number dstoff.

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val blit : t -> t -> unit

blit t1 t2 is the same as Bigarray.Array1.blit.

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val round_to_page_size : int -> int

round_to_page_size n returns the number of bytes that will be allocated for storing n bytes in memory

module Io_page