flatipc 0.1.2

Zerocopy IPC between Xous clients and servers
Documentation 
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use std::sync::{LazyLock, Mutex};

pub struct Server {
    lend: Box<dyn Send + Fn(usize, usize, usize, &[u8]) -> (usize, usize)>,
    lend_mut: Box<dyn Send + Fn(usize, usize, usize, &mut [u8]) -> (usize, usize)>,
}

impl Server {
    pub fn new(
        lend: Box<dyn Send + Fn(usize, usize, usize, &[u8]) -> (usize, usize)>,
        lend_mut: Box<dyn Send + Fn(usize, usize, usize, &mut [u8]) -> (usize, usize)>,
    ) -> Self {
        Server { lend, lend_mut }
    }
}

pub struct IpcMachine {
    servers: Vec<Server>,
}

pub(crate) static IPC_MACHINE: LazyLock<Mutex<IpcMachine>> =
    LazyLock::new(|| Mutex::new(IpcMachine::new()));

impl IpcMachine {
    fn new() -> Self {
        IpcMachine {
            servers: Vec::new(),
        }
    }

    pub fn add_server(&mut self, server: Server) -> usize {
        let server_id = self.servers.len();
        self.servers.push(server);
        server_id
    }

    pub fn lend(
        &self,
        server_id: usize,
        opcode: usize,
        a: usize,
        b: usize,
        data: &[u8],
    ) -> (usize, usize) {
        (self.servers[server_id].lend)(opcode, a, b, data)
    }

    pub fn lend_mut(
        &self,
        server_id: usize,
        opcode: usize,
        a: usize,
        b: usize,
        data: &mut [u8],
    ) -> (usize, usize) {
        (self.servers[server_id].lend_mut)(opcode, a, b, data)
    }
}