I've checked in my proposal for the java.util.concurrent module at https://svn.apache.org/repos/asf/incubator/harmony/enhanced/classlib/trunk/s andbox/juc-proposal.
The README gives a high level overview of the content. I've generated some documentation and published it here for easier browsing: http://people.apache.org/~ndbeyer/concurrent/project-reports.html. Design - Most of the code is straight from Doug Lea and the JSR group. The only piece I've added are the service interfaces that the VM must implement and I've uplifted the original code, where necessary to utilize these VM service interfaces. org.apache.harmony.concurrent.AtomicSupport [1] - The service interface for 'java.util.concurrent.atomic' features such as CAS (compare and swap) and volatile read/writes. org.apache.harmony.concurrent.LocksSupport [2] - The service interface for 'java.util.concurrent.locks' support. This is similar to the java.util.concurrent.locks.LockSupport contract. These service interfaces would need to be implemented by a VM provider and their implementations are registered using Service Provider configuration files, as defined by the JAR specification [3]. The rationale for the design of the support classes was to preserve as much of the original code as possible, so as to facilitate future maintenance and isolate the external variability with well-defined service contracts. If you wan to see what source code changed, then extract the 'concurrent.tar.gz' and compare the 'concurrent' folder from there to the 'concurrent/src/main/java/java/util/concurrent' folder. TODOs - * Implement the service interfaces by a VM!! * Setup the build scripts (trivial) - currently there's a 'pom.xml' that's in the project, which can be used with Maven to run a build and generate documentation (mvn package site). It was just quicker for me to do this while I as hacking. * Consider and possible implement base/default service providers for win32 and linux that VMs can use if they like. * Determine the best place to integrate the TCK source, which is also available at Doug Lea's site. * There are a LOT of changes, fixes and enhancements to the code at Doug Lea's site; consider what code we should additional take. Let the discussions begin. -Nathan [1] http://people.apache.org/~ndbeyer/concurrent/apidocs/org/apache/harmony/conc urrent/AtomicSupport.html [2] http://people.apache.org/~ndbeyer/concurrent/apidocs/org/apache/harmony/conc urrent/LocksSupport.html [3] http://java.sun.com/j2se/1.5.0/docs/guide/jar/jar.html#Service%20Provider
