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use std::io;
use std::path::Path;
use std::ffi::c_void;
use libloading::{Library, Symbol};
use static_assertions::assert_eq_size;
use dd_utils::error::*;
pub const CORE_API_VERSION: i32 = 1;
pub struct ComputeCore {
#[used]
library: Library,
// init: unsafe extern "C" fn(i32) -> i32,
run_job: unsafe extern "C" fn(u64, *mut c_void, *mut u64, *mut *mut c_void) -> i32,
free_outdata: unsafe extern "C" fn(u64, *mut c_void),
}
impl ComputeCore {
pub fn load<P: AsRef<Path>>(lib_path: P) -> io::Result<Self> {
let lib_path = lib_path.as_ref();
let lib_path = lib_path.canonicalize().map_err(|e| {
format!("Library '{}' does not exist", lib_path.display()).perror(e)
})?;
let library = libloading::Library::new(&lib_path).map_err(|e| {
format!("Cannot load library at '{}'", lib_path.display()).perror(e)
})?;
macro_rules! load_symbol {
($name:expr, $symname:expr, $typ:ty) => {{
let sym: io::Result<Symbol<$typ>> = library.get($symname).map_err(|e| {
format!("Failed to load symbol '{}' from library '{}'", $name, lib_path.display()).perror(e)
});
sym.map(|s| std::mem::transmute::<*mut c_void, $typ>(s.into_raw().into_raw()))
}}
}
let init = unsafe { load_symbol!("worker_init", b"worker_init\0", unsafe extern "C" fn(i32) -> i32)? };
let run_job = unsafe { load_symbol!("worker_run_job",b"worker_run_job\0", unsafe extern "C" fn(u64, *mut c_void, *mut u64, *mut *mut c_void) -> i32)? };
let free_outdata = unsafe { load_symbol!("worker_free_outdata", b"worker_free_outdata\0", unsafe extern "C" fn(u64, *mut c_void))? };
let ret = unsafe {
init(CORE_API_VERSION)
};
if ret != 0 {
return Err(format!("Library refused initialisation at version {}: '{}'", CORE_API_VERSION, lib_path.display()).ioerr());
}
Ok(ComputeCore { library, /*init,*/ run_job, free_outdata })
}
/// Will block on this thread, so if you don't want to block, spawn a new thread.
/// This does not syntactically need mutability, but since one can only run one job at a time
/// on a core, semantic mutability seems warranted.
pub fn run_job(&mut self, input_data: &mut [u8]) -> (i32, Vec<u8>) {
let mut outsize = 0u64;
let mut outdataptr: *mut c_void = std::ptr::null_mut();
assert_eq_size!(u64, usize);
let ret = unsafe {
(self.run_job)(input_data.len() as u64, input_data.as_mut_ptr() as *mut c_void, &mut outsize, &mut outdataptr)
};
let mut result = (ret, Vec::new());
if outsize != 0 && outdataptr != std::ptr::null_mut() {
result.1.resize(outsize as usize, 0u8);
unsafe {
std::ptr::copy(outdataptr as *const u8, result.1.as_mut_ptr(), outsize as usize);
}
}
unsafe {
(self.free_outdata)(outsize, outdataptr);
}
result
}
}
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