RUST_BACKTRACE=1 cargo test tx_inside_rx_inside_mioco

Finished dev [unoptimized + debuginfo] target(s) in 0.0 secs
 Running target/debug/deps/mioco-5839952be6ccc31d

running 0 tests

test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured

 Running target/debug/deps/mpsc-acbd32c7554c8ddd

running 1 test Apr 23 01:07:25.784 DEBG Creating mioco instance, mioco: 0.9.0-pre

thread '<unnamed>' panicked at 'called `Result::unwrap()` on an `Err` value: Empty', src/libcore/result.rs:859
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
stack backtrace:
   0: <core::result::Result<T, E>>::unwrap
   1: mpsc::tx_inside_rx_inside_mioco::{{closure}}
   2: mioco::Fiber::new::{{closure}}::{{closure}}
   3: <std::panic::AssertUnwindSafe<F> as core::ops::FnOnce<()>>::call_once
   4: std::panicking::try::do_call
   5: __rust_maybe_catch_panic
   6: std::panicking::try
   7: std::panic::catch_unwind
   8: mioco::Fiber::new::{{closure}}
   9: <mioco::thunk::Thunk<'a, (), R>>::new::{{closure}}
  10: <F as mioco::thunk::Invoke<A, R>>::invoke
  11: <mioco::thunk::Thunk<'a, A, R>>::invoke
  12: mioco::context_function

test tx_inside_rx_inside_mioco ... ok

test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured

This PR updates the dependencies to newer versions.

The Context crate version 2 makes all calls unsafe. I therefore just wrapped all calls to Context::new and resume into an unsafe block.

The PR also removes a the printerrln macro from latency.rs, as it is not needed anymore.

We getting this error when compiling mioco on Rust1.24

private type src::sync::mpsc::ReceiverCore<T> in public interface --> /home/cooldude/.cargo/registry/src/github.com-1ecc6299db9ec823/mioco-0.8.1/src/sync/mpsc.rs:35:5 | 35 | type Raw = ReceiverCore; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ can't leak private type

error[E0446]: private type src::timer::TimerCore in public interface --> /home/cooldude/.cargo/registry/src/github.com-1ecc6299db9ec823/mioco-0.8.1/src/timer.rs:47:5 | 47 | type Raw = TimerCore; | ^^^^^^^^^^^^^^^^^^^^^ can't leak private type

error: aborting due to 2 previous errors

error: Could not compile mioco.

First off, thanks for mioco!

Steps to reproduce from b8cc872fa1e5d127b2b4c60cdd133ee7aadd22f2 (macOS 10.12.4, macbook pro with 4 cores):

$ cargo build --example http-server
$ target/debug/examples/http-server&
$ ab http://127.0.0.1:5555/

This is ApacheBench, Version 2.3 <$Revision: 1757674 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking 127.0.0.1 (be patient)...apr_pollset_poll: The timeout specified has expired (70007)
Total of 1 requests completed

Sending single requests via telnet or Chrome works fine. I think it has to do with not closing the connection here: https://github.com/dpc/mioco/blob/master/examples/http-server.rs#L68

If I add a return Ok(()) there, ab works intermittently. It hangs every few requests.