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use crate::{FromInner, HandleTrait, Inner, IntoInner};
use std::convert::TryFrom;
use uv::{uv_prepare_init, uv_prepare_start, uv_prepare_stop, uv_prepare_t};
callbacks! {
pub PrepareCB(handle: PrepareHandle);
}
#[derive(Default)]
pub(crate) struct PrepareDataFields<'a> {
prepare_cb: PrepareCB<'a>,
}
extern "C" fn uv_prepare_cb(handle: *mut uv_prepare_t) {
let dataptr = crate::Handle::get_data(uv_handle!(handle));
if !dataptr.is_null() {
unsafe {
if let super::PrepareData(d) = &mut (*dataptr).addl {
d.prepare_cb.call(handle.into_inner());
}
}
}
}
#[derive(Clone, Copy)]
pub struct PrepareHandle {
handle: *mut uv_prepare_t,
}
impl PrepareHandle {
pub fn new(r#loop: &crate::Loop) -> crate::Result<PrepareHandle> {
let layout = std::alloc::Layout::new::<uv_prepare_t>();
let handle = unsafe { std::alloc::alloc(layout) as *mut uv_prepare_t };
if handle.is_null() {
return Err(crate::Error::ENOMEM);
}
let ret = unsafe { uv_prepare_init(r#loop.into_inner(), handle) };
if ret < 0 {
unsafe { std::alloc::dealloc(handle as _, layout) };
return Err(crate::Error::from_inner(ret as uv::uv_errno_t));
}
crate::Handle::initialize_data(uv_handle!(handle), super::PrepareData(Default::default()));
Ok(PrepareHandle { handle })
}
pub fn start<CB: Into<PrepareCB<'static>>>(&mut self, cb: CB) -> crate::Result<()> {
let cb = cb.into();
let uv_cb = use_c_callback!(uv_prepare_cb, cb);
let dataptr = crate::Handle::get_data(uv_handle!(self.handle));
if !dataptr.is_null() {
if let super::PrepareData(d) = unsafe { &mut (*dataptr).addl } {
d.prepare_cb = cb;
}
}
crate::uvret(unsafe { uv_prepare_start(self.handle, uv_cb) })
}
pub fn stop(&mut self) -> crate::Result<()> {
crate::uvret(unsafe { uv_prepare_stop(self.handle) })
}
}
impl FromInner<*mut uv_prepare_t> for PrepareHandle {
fn from_inner(handle: *mut uv_prepare_t) -> PrepareHandle {
PrepareHandle { handle }
}
}
impl Inner<*mut uv::uv_handle_t> for PrepareHandle {
fn inner(&self) -> *mut uv::uv_handle_t {
uv_handle!(self.handle)
}
}
impl From<PrepareHandle> for crate::Handle {
fn from(prepare: PrepareHandle) -> crate::Handle {
crate::Handle::from_inner(Inner::<*mut uv::uv_handle_t>::inner(&prepare))
}
}
impl crate::ToHandle for PrepareHandle {
fn to_handle(&self) -> crate::Handle {
crate::Handle::from_inner(Inner::<*mut uv::uv_handle_t>::inner(self))
}
}
impl TryFrom<crate::Handle> for PrepareHandle {
type Error = crate::ConversionError;
fn try_from(handle: crate::Handle) -> Result<Self, Self::Error> {
let t = handle.get_type();
if t != crate::HandleType::PREPARE {
Err(crate::ConversionError::new(t, crate::HandleType::PREPARE))
} else {
Ok((handle.inner() as *mut uv_prepare_t).into_inner())
}
}
}
impl HandleTrait for PrepareHandle {}
impl crate::Loop {
pub fn prepare(&self) -> crate::Result<PrepareHandle> {
PrepareHandle::new(self)
}
}