Stepan Koltsov stepancheg

Lengthy explanation why patch works.

Sender part is simple: it (either pushes a message or sets "closed" flag) and then calls notify if any task is registered.

The interesting part is function

`poll_queue_and_open`

Function starts with optimistic pop:

	; ModuleID = 'xx.cgu-0.rs'
	source_filename = "xx.cgu-0.rs"
	target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
	target triple = "x86_64-apple-darwin"

	%str_slice = type { i8*, i64 }
	%"alloc::vec::Vec<u8>" = type { %"alloc::raw_vec::RawVec<u8, alloc::heap::HeapAlloc>", [0 x i8], i64, [0 x i8] }
	%"alloc::raw_vec::RawVec<u8, alloc::heap::HeapAlloc>" = type { %"core::ptr::Unique<u8>", [0 x i8], i64, [0 x i8], %"alloc::heap::HeapAlloc", [0 x i8] }
	%"core::ptr::Unique<u8>" = type { %"core::nonzero::NonZero<*const u8>", [0 x i8], %"core::marker::PhantomData<u8>", [0 x i8] }
	%"core::nonzero::NonZero<const u8>" = type { i8, [0 x i8] }

	struct CyclicBarrierShared {
	count: u32,
	mutex: Mutex<(u32, bool)>,
	condv: Condvar,
	}

	struct CyclicBarrier {
	shared: Arc<CyclicBarrierShared>,
	}

	use std::boxed::Box;
	use std::sync::atomic::AtomicPtr;
	use std::sync::atomic::Ordering;
	use std::ptr;
	use std::mem;


	/// Atomic holder of `Option<Box<T>>`.
	///
	/// `AtomicBoxOption` owns a pointer, thus it `drop` content on self `drop`.

	#include <stdio.h>
	#include <pthread.h>

	int main() {
	pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
	pthread_cond_t condvar = PTHREAD_COND_INITIALIZER;
	int r = pthread_mutex_lock(&mutex);
	if (r != 0) {
	perror("pthread_mutex_lock");
	return 1;

	use std::boxed::Box;
	use std::sync::atomic::AtomicPtr;
	use std::sync::atomic::Ordering;
	use std::ptr;
	use std::mem;


	/// Max value for flag stored in `AtomicBoxOrFlag`
	/// `3` is safe value, because pointers are at least 4-byte aligned.
	/// Although in practice `malloc` never return small addresses,

	package org.asynchttpclient.future;

	import java.util.ArrayList;
	import java.util.concurrent.CompletableFuture;
	import java.util.concurrent.ExecutionException;
	import java.util.concurrent.TimeUnit;
	import java.util.concurrent.TimeoutException;

	/**
	* @author Stepan Koltsov

	// HTTP/2 request of response stream is a sequence of frames.
	// Header frames can be interleaves with data frames.
	enum HttpStreamPart {
	Headers(Vec<Header>),
	Body(Vec<u8>),
	}

	// To be implemented by user.
	//
	// Server may start sending response before