package lwt
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lwt.unix
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package lwt
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Sequences of buffer slices for writev.
Mutable sequences of I/O vectors. An I/O vector describes a slice of a bytes or Bigarray buffer. Each I/O vector is a triple containing a reference to the buffer, an offset into the buffer where the slice begins, and the length of the slice.
Type abbreviation equivalent to Lwt_bytes.t. Do not use this type name directly; use Lwt_bytes.t instead.
val create : unit -> tCreates an empty I/O vector sequence.
val append_bytes : t -> bytes -> int -> int -> unitappend_bytes vs buffer offset length appends a slice of the bytes buffer buffer beginning at offset and with length length to the I/O vector sequence vs.
append_bigarray vs buffer offset length appends a slice of the Bigarray buffer buffer beginning at offset and with length length to the I/O vector sequence vs.
val drop : t -> int -> unitdrop vs n adjusts the I/O vector sequence vs so that it no longer includes its first n bytes.
val is_empty : t -> boolis_empty vs is true if and only if vs has no I/O vectors, or all I/O vectors in vs have zero bytes.
val byte_count : t -> intbyte_count vs is the total number of bytes in vs.
Some systems limit the number of I/O vectors that can be passed in a single call to their writev or readv system calls. On those systems, if the limit is n, this value is equal to Some n. On systems without such a limit, the value is equal to None.
Unless you need atomic I/O operations, you can ignore this limit. The Lwt binding automatically respects it internally. See Lwt_unix.writev.
A typical limit is 1024 vectors.