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use glib_sys;
use translate::*;
use futures_channel::oneshot;
use std::future::Future;
use std::ptr;
#[derive(Debug)]
pub struct ThreadPool(ptr::NonNull<glib_sys::GThreadPool>);
unsafe impl Send for ThreadPool {}
unsafe impl Sync for ThreadPool {}
impl ThreadPool {
pub fn new_shared(max_threads: Option<u32>) -> Result<Self, ::Error> {
unsafe {
let mut err = ptr::null_mut();
let pool = glib_sys::g_thread_pool_new(
Some(spawn_func),
ptr::null_mut(),
max_threads.map(|v| v as i32).unwrap_or(-1),
glib_sys::GFALSE,
&mut err,
);
if pool.is_null() {
Err(from_glib_full(err))
} else {
Ok(ThreadPool(ptr::NonNull::new_unchecked(pool)))
}
}
}
pub fn new_exclusive(max_threads: u32) -> Result<Self, ::Error> {
unsafe {
let mut err = ptr::null_mut();
let pool = glib_sys::g_thread_pool_new(
Some(spawn_func),
ptr::null_mut(),
max_threads as i32,
glib_sys::GTRUE,
&mut err,
);
if pool.is_null() {
Err(from_glib_full(err))
} else {
Ok(ThreadPool(ptr::NonNull::new_unchecked(pool)))
}
}
}
pub fn push<F: FnOnce() + Send + 'static>(&self, func: F) -> Result<(), ::Error> {
unsafe {
let func: Box<dyn FnOnce() + Send + 'static> = Box::new(func);
let func = Box::new(func);
let mut err = ptr::null_mut();
let func = Box::into_raw(func);
let ret: bool = from_glib(glib_sys::g_thread_pool_push(
self.0.as_ptr(),
func as *mut _,
&mut err,
));
if ret {
Ok(())
} else {
let _ = Box::from_raw(func);
Err(from_glib_full(err))
}
}
}
pub fn push_future<T: Send + 'static, F: FnOnce() -> T + Send + 'static>(
&self,
func: F,
) -> Result<impl Future<Output = T>, ::Error> {
use futures_util::future::FutureExt;
let (sender, receiver) = oneshot::channel();
self.push(move || {
let _ = sender.send(func());
})?;
Ok(receiver.map(|res| res.expect("Dropped before executing")))
}
pub fn set_max_threads(&self, max_threads: Option<u32>) -> Result<(), ::Error> {
unsafe {
let mut err = ptr::null_mut();
let ret: bool = from_glib(glib_sys::g_thread_pool_set_max_threads(
self.0.as_ptr(),
max_threads.map(|v| v as i32).unwrap_or(-1),
&mut err,
));
if ret {
Ok(())
} else {
Err(from_glib_full(err))
}
}
}
pub fn get_max_threads(&self) -> Option<u32> {
unsafe {
let max_threads = glib_sys::g_thread_pool_get_max_threads(self.0.as_ptr());
if max_threads == -1 {
None
} else {
Some(max_threads as u32)
}
}
}
pub fn get_num_threads(&self) -> u32 {
unsafe { glib_sys::g_thread_pool_get_num_threads(self.0.as_ptr()) }
}
pub fn get_unprocessed(&self) -> u32 {
unsafe { glib_sys::g_thread_pool_unprocessed(self.0.as_ptr()) }
}
pub fn set_max_unused_threads(max_threads: Option<u32>) {
unsafe {
glib_sys::g_thread_pool_set_max_unused_threads(
max_threads.map(|v| v as i32).unwrap_or(-1),
)
}
}
pub fn get_max_unused_threads() -> Option<u32> {
unsafe {
let max_unused_threads = glib_sys::g_thread_pool_get_max_unused_threads();
if max_unused_threads == -1 {
None
} else {
Some(max_unused_threads as u32)
}
}
}
pub fn get_num_unused_threads() -> u32 {
unsafe { glib_sys::g_thread_pool_get_num_unused_threads() }
}
pub fn stop_unused_threads() {
unsafe {
glib_sys::g_thread_pool_stop_unused_threads();
}
}
pub fn set_max_idle_time(max_idle_time: u32) {
unsafe { glib_sys::g_thread_pool_set_max_idle_time(max_idle_time) }
}
pub fn get_max_idle_time() -> u32 {
unsafe { glib_sys::g_thread_pool_get_max_idle_time() }
}
}
impl Drop for ThreadPool {
fn drop(&mut self) {
unsafe {
glib_sys::g_thread_pool_free(self.0.as_ptr(), glib_sys::GFALSE, glib_sys::GTRUE);
}
}
}
unsafe extern "C" fn spawn_func(func: glib_sys::gpointer, _data: glib_sys::gpointer) {
let func: Box<Box<dyn FnOnce()>> = Box::from_raw(func as *mut _);
func()
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_push() {
use std::sync::mpsc;
let p = ThreadPool::new_exclusive(1).unwrap();
let (sender, receiver) = mpsc::channel();
p.push(move || {
sender.send(true).unwrap();
})
.unwrap();
assert_eq!(receiver.recv(), Ok(true));
}
#[test]
fn test_push_future() {
let c = ::MainContext::new();
let p = ThreadPool::new_shared(None).unwrap();
let fut = p.push_future(|| true).unwrap();
let res = c.block_on(fut);
assert!(res);
}
}