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Scott Mitchell ce241bd11e Epoll flush/writabilityChange deadlock 
Motivation:
b215794de3 recently introduced a change in behavior where writeSpinCount provided a limit for how many write operations were attempted per flush operation. However when the write quantum was meet the selector write flag was not cleared, and the channel unsafe flush0 method has an optimization which prematurely exits if the write flag is set. This may lead to no write progress being made under the following scenario:
- flush is called, but the socket can't accept all data, we set the write flag
- the selector wakes us up because the socket is writable, we write data and use the writeSpinCount quantum
- we then schedule a flush() on the EventLoop to execute later, however it the flush0 optimization prematurely exits because the write flag is still set

In this scenario the socket is still writable so the EventLoop may never notify us that the socket is writable, and therefore we may never attempt to flush data to the OS.

Modifications:
- When the writeSpinCount quantum is exceeded we should clear the selector write flag

Result:
Fixes https://github.com/netty/netty/issues/7729
2018-02-20 11:40:58 +01:00
.github Use GitHub Issue/PR Template Feature 2016-12-07 11:40:26 -08:00
.mvn/wrapper Include mvn wrapper to make setup of development env easier 2018-01-26 08:13:17 +01:00
all [maven-release-plugin] prepare for next development iteration 2018-02-05 12:02:35 +00:00
bom [maven-release-plugin] prepare for next development iteration 2018-02-05 12:02:35 +00:00
buffer Added exact utf8 length estimator and exposed writeUtf8 with custom space reservation on destination buffer 2018-02-16 11:52:35 +01:00
codec Simplify CharSequenceValueConverter#convertToBoolean 2018-02-17 07:47:44 +01:00
codec-dns [maven-release-plugin] prepare for next development iteration 2018-02-05 12:02:35 +00:00
codec-haproxy Fix typos in docs. 2018-02-14 08:44:07 +01:00
codec-http Fix typos in docs. 2018-02-14 08:44:07 +01:00
codec-http2 Fix typos in docs. 2018-02-14 08:44:07 +01:00
codec-memcache [maven-release-plugin] prepare for next development iteration 2018-02-05 12:02:35 +00:00
codec-mqtt [maven-release-plugin] prepare for next development iteration 2018-02-05 12:02:35 +00:00
codec-redis [maven-release-plugin] prepare for next development iteration 2018-02-05 12:02:35 +00:00
codec-smtp [maven-release-plugin] prepare for next development iteration 2018-02-05 12:02:35 +00:00
codec-socks [maven-release-plugin] prepare for next development iteration 2018-02-05 12:02:35 +00:00
codec-stomp [maven-release-plugin] prepare for next development iteration 2018-02-05 12:02:35 +00:00
codec-xml [maven-release-plugin] prepare for next development iteration 2018-02-05 12:02:35 +00:00
common Propagate full Unsafe unavailability reason in PlatformDependent 2018-02-16 10:43:06 -08:00
dev-tools [maven-release-plugin] prepare for next development iteration 2018-02-05 12:02:35 +00:00
docker Provide a Docker image for reproducible builds 2018-01-22 20:02:17 +01:00
example Use long for http2 ping payload. 2018-02-08 10:23:34 +01:00
handler SSL connection not closed properly after handshake failure 2018-02-16 08:25:47 -08:00
handler-proxy [maven-release-plugin] prepare for next development iteration 2018-02-05 12:02:35 +00:00
license Add the NOTICE of the forked portion of Apache Harmony 2018-01-30 11:22:51 +01:00
microbench [maven-release-plugin] prepare for next development iteration 2018-02-05 12:02:35 +00:00
resolver [maven-release-plugin] prepare for next development iteration 2018-02-05 12:02:35 +00:00
resolver-dns Fix typos in docs. 2018-02-14 08:44:07 +01:00
tarball [maven-release-plugin] prepare for next development iteration 2018-02-05 12:02:35 +00:00
testsuite Epoll flush/writabilityChange deadlock 2018-02-20 11:40:58 +01:00
testsuite-autobahn [maven-release-plugin] prepare for next development iteration 2018-02-05 12:02:35 +00:00
testsuite-http2 Use long for http2 ping payload. 2018-02-08 10:23:34 +01:00
testsuite-osgi [maven-release-plugin] prepare for next development iteration 2018-02-05 12:02:35 +00:00
transport Epoll flush/writabilityChange deadlock 2018-02-20 11:40:58 +01:00
transport-native-epoll Epoll flush/writabilityChange deadlock 2018-02-20 11:40:58 +01:00
transport-native-kqueue Epoll flush/writabilityChange deadlock 2018-02-20 11:40:58 +01:00
transport-native-unix-common [maven-release-plugin] prepare for next development iteration 2018-02-05 12:02:35 +00:00
transport-native-unix-common-tests [maven-release-plugin] prepare for next development iteration 2018-02-05 12:02:35 +00:00
transport-rxtx [maven-release-plugin] prepare for next development iteration 2018-02-05 12:02:35 +00:00
transport-sctp [maven-release-plugin] prepare for next development iteration 2018-02-05 12:02:35 +00:00
transport-udt [maven-release-plugin] prepare for next development iteration 2018-02-05 12:02:35 +00:00
.fbprefs Updated Find Bugs configuration 2009-03-04 10:33:09 +00:00
.gitattributes Include mvn wrapper to make setup of development env easier 2018-01-26 08:13:17 +01:00
.gitignore Use shaded dependency on JCTools instead of copy and paste 2016-06-10 13:19:45 +02:00
.travis.yml Travis CI branch whitelisting 2013-03-11 09:55:43 +09:00
CONTRIBUTING.md Move the pull request guide to the developer guide 2014-03-12 13:13:58 +09:00
LICENSE.txt Relicensed to Apache License v2 2009-08-28 07:15:49 +00:00
mvnw Include mvn wrapper to make setup of development env easier 2018-01-26 08:13:17 +01:00
mvnw.cmd Include mvn wrapper to make setup of development env easier 2018-01-26 08:13:17 +01:00
NOTICE.txt Add the NOTICE of the forked portion of Apache Harmony 2018-01-30 11:22:51 +01:00
pom.xml Update jetty-alpn-agent for latest java8 release. 2018-02-16 09:18:22 +01:00
README.md Provide an Automatic-Module-Name for the netty-all artifact fixes #7644 2018-01-27 20:31:16 +01:00
run-example.sh Add UptimeServer and adjust UptimeClient's code style. 2017-04-28 07:41:07 +02:00

README.md

Netty Project

Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients.

Links

How to build

For the detailed information about building and developing Netty, please visit the developer guide. This page only gives very basic information.

You require the following to build Netty:

Note that this is build-time requirement. JDK 5 (for 3.x) or 6 (for 4.0+) is enough to run your Netty-based application.

Branches to look

Development of all versions takes place in each branch whose name is identical to <majorVersion>.<minorVersion>. For example, the development of 3.9 and 4.0 resides in the branch '3.9' and the branch '4.0' respectively.

Usage with JDK 9

Netty can be used in modular JDK9 applications as a collection of automatic modules. The module names follow the reverse-DNS style, and are derived from subproject names rather than root packages due to historical reasons. They are listed below:

  • io.netty.all
  • io.netty.buffer
  • io.netty.codec
  • io.netty.codec.dns
  • io.netty.codec.haproxy
  • io.netty.codec.http
  • io.netty.codec.http2
  • io.netty.codec.memcache
  • io.netty.codec.mqtt
  • io.netty.codec.redis
  • io.netty.codec.smtp
  • io.netty.codec.socks
  • io.netty.codec.stomp
  • io.netty.codec.xml
  • io.netty.common
  • io.netty.handler
  • io.netty.handler.proxy
  • io.netty.resolver
  • io.netty.resolver.dns
  • io.netty.transport
  • io.netty.transport.epoll (native omitted - reserved keyword in Java)
  • io.netty.transport.kqueue (native omitted - reserved keyword in Java)
  • io.netty.transport.unix.common (native omitted - reserved keyword in Java)
  • io.netty.transport.rxtx
  • io.netty.transport.sctp
  • io.netty.transport.udt

Automatic modules do not provide any means to declare dependencies, so you need to list each used module separately in your module-info file.