双缓冲区

Simon Cooke的Bip-Buffer的Rust实现

Bip-Buffer类似于循环缓冲区，但数据插入到缓冲区空间的两个旋转区域。这允许读取返回连续的内存块，即使它们跨越一个在循环缓冲区中通常包含环绕的区域。它对于需要连续内存块的API特别有用，消除了在使用前将数据复制到临时缓冲区的需要。

示例

use bipbuffer::BipBuffer;

// Creates a 4-element Bip-Buffer of u8
let mut buffer: BipBuffer<u8> = BipBuffer::new(4);
{
    // Reserves 4 slots for insert
    let reserved = buffer.reserve(4).unwrap();
    reserved[0] = 7;
    reserved[1] = 22;
    reserved[2] = 218;
    reserved[3] = 56;
}
// Stores the values into an available region,
// clearing the existing reservation
buffer.commit(4);
{
    // Gets the data stored in the region as a contiguous block
    let block = buffer.read().unwrap();
    assert_eq!(block[0], 7);
    assert_eq!(block[1], 22);
    assert_eq!(block[2], 218);
    assert_eq!(block[3], 56);
}
// Marks the first two parts of the block as free
buffer.decommit(2);
{
    // The block should now contain only the last two values
    let block = buffer.read().unwrap();
    assert_eq!(block[0], 218);
    assert_eq!(block[1], 56);
}