move threadpool to separate crate

actix-rt/src/blocking.rs

@@ -1,88 +0,0 @@
-//! Thread pool for blocking operations
-
-use std::fmt;
-
-use derive_more::Display;
-use futures::sync::oneshot;
-use futures::{Async, Future, Poll};
-use parking_lot::Mutex;
-use threadpool::ThreadPool;
-
-/// Env variable for default cpu pool size
-const ENV_CPU_POOL_VAR: &str = "ACTIX_CPU_POOL";
-
-lazy_static::lazy_static! {
-    pub(crate) static ref DEFAULT_POOL: Mutex<ThreadPool> = {
-        let default = match std::env::var(ENV_CPU_POOL_VAR) {
-            Ok(val) => {
-                if let Ok(val) = val.parse() {
-                    val
-                } else {
-                    log::error!("Can not parse ACTIX_CPU_POOL value");
-                    num_cpus::get() * 5
-                }
-            }
-            Err(_) => num_cpus::get() * 5,
-        };
-        Mutex::new(
-            threadpool::Builder::new()
-                .thread_name("actix-web".to_owned())
-                .num_threads(default)
-                .build(),
-        )
-    };
-}
-
-thread_local! {
-    static POOL: ThreadPool = {
-        DEFAULT_POOL.lock().clone()
-    };
-}
-
-/// Blocking operation execution error
-#[derive(Debug, Display)]
-pub enum BlockingError<E: fmt::Debug> {
-    #[display(fmt = "{:?}", _0)]
-    Error(E),
-    #[display(fmt = "Thread pool is gone")]
-    Canceled,
-}
-
-/// Execute blocking function on a thread pool, returns future that resolves
-/// to result of the function execution.
-pub fn run<F, I, E>(f: F) -> CpuFuture<I, E>
-where
-    F: FnOnce() -> Result<I, E> + Send + 'static,
-    I: Send + 'static,
-    E: Send + fmt::Debug + 'static,
-{
-    let (tx, rx) = oneshot::channel();
-    POOL.with(|pool| {
-        pool.execute(move || {
-            if !tx.is_canceled() {
-                let _ = tx.send(f());
-            }
-        })
-    });
-
-    CpuFuture { rx }
-}
-
-/// Blocking operation completion future. It resolves with results
-/// of blocking function execution.
-pub struct CpuFuture<I, E> {
-    rx: oneshot::Receiver<Result<I, E>>,
-}
-
-impl<I, E: fmt::Debug> Future for CpuFuture<I, E> {
-    type Item = I;
-    type Error = BlockingError<E>;
-
-    fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
-        let res = futures::try_ready!(self.rx.poll().map_err(|_| BlockingError::Canceled));
-        match res {
-            Ok(val) => Ok(Async::Ready(val)),
-            Err(err) => Err(BlockingError::Error(err)),
-        }
-    }
-}

actix-rt/src/lib.rs

@@ -1,7 +1,6 @@
 //! A runtime implementation that runs everything on the current thread.
 
 mod arbiter;
-pub mod blocking;
 mod builder;
 mod runtime;
 mod system;
@@ -11,6 +10,9 @@ pub use self::builder::{Builder, SystemRunner};
 pub use self::runtime::Runtime;
 pub use self::system::System;
 
+#[doc(hidden)]
+pub use actix_threadpool as blocking;
+
 /// Spawns a future on the current arbiter.
 ///
 /// # Panics