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0MQ version 3.2.2 stable, released on 2012/11/23
================================================

Issues addressed in this release
--------------------------------

* LIBZMQ-384 No meta data for ZMQ_EVENT_DISCONNECTED monitor event
* LIBZMQ-414 Error in ARM/Thumb2 assembly (atomic_ptr.hpp)
* LIBZMQ-417 zmq_assert (!incomplete_in) in session_base.cpp 228
* LIBZMQ-447 socket_base_t::recv() packet loss and memory leak at high receiving rate
* LIBZMQ-448 Builds fail on older versions of GCC
* LIBZMQ-449 Builds fail on AIX
* LIBZMQ-450 lt-test_monitor: fails with assertion at test_monitor.cpp:81
* LIBZMQ-451 ZMQ_ROUTER_MANDATORY blocks forever
* LIBZMQ-452 test_connect_delay.cpp:175:12: error: 'sleep' was not declared in this scope
* LIBZMQ-456 ZMQ_XPUB_VERBOSE does not propagate in a tree of XPUB/XSUB devices
* LIBZMQ-458 lt-test_router_mandatory fails with assertion at test_router_mandatory.cpp:53
* LIBZMQ-459 Assertion failed: encoder (stream_engine.cpp:266
* LIBZMQ-464 PUB socket with HWM set leaks memory
* LIBZMQ-465 PUB/SUB results in 80-90% of CPU load
* LIBZMQ-468 ZMQ_XPUB_VERBOSE & unsubscribe
* LIBZMQ-472 Segfault in zmq_poll in REQ to ROUTER dialog

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0MQ version 3.2.1 (RC2), released on 2012/10/15
===============================================

Issues addressed in this release
--------------------------------

* Fixed issue xxx - handle insufficient resources on accept() properly.
* Fixed issue 443 - added ZMQ_XPUB_VERBOSE setsocket option.
* Fixed issue 433 - ZeroMQ died on receiving EPIPE
* Fixed issue 423 - test_pair_tcp hangs
* Fixed issue 416 - socket_base: fix 'va_list' has not been declared error
* Fixed issue 409 - Pub-sub interoperability between 2.x and 3.x.
* Fixed issue 404 - zmq_term can not safely be re-entered with pgm transport
* Fixed issue 399 - zmq_ctx_set_monitor callback is not works properly
* Fixed issue 393 - libzmq does not build on Android (socklen_t signed comparison)
* Fixed issue 392 - Interaction with pyzmq on Android
* Fixed issue 389 - Assertion failure in mtrie.cpp:317
* Fixed issue 388 - tests/test_monitor.cpp has no newline at EOF (causes compile error)
* Fixed issue 387 - "sa_family_t sa_family;" in pgm_socket.cpp is unused variable
* Fixed issue 385 - Rework ZMQ_FAIL_UNROUTABLE socket option to actually work
* Fixed issue 382 - Current libzmq doesn't compile on Android NDK
* Fixed issue 377 - ZeroMQ will not build on Windows with OpenPGM
* Fixed issue 375 - error: unused variable 'sa_family'
* Fixed issue 373 - Unable to build libzmq/zeromq3.x on AIX7
* Fixed issue 372 - Unable to build libzmq/zeromq3.x on HPUX 11iv3
* Fixed issue 371 - Unable to build libzmq/zeromq3.x on RHEL5/SLES10
* Fixed issue 329 - wsa_error_to_errno() calls abort() on WSAEACCES
* Fixed issue 309 - Assertion failed: options.recv_identity (socket_base.cpp:864)
* Fixed issue 211 - Assertion failed: msg_->flags & ZMQ_MSG_MORE (rep.cpp:81)

API changes
-----------

* zmq_device () deprecated and replaced by zmq_proxy ().
* zmq_ctx_set_monitor () replaced by zmq_socket_monitor ().
* ZMQ_ROUTER_BEHAVIOR/ZMQ_FAIL_UNROUTABLE renamed experimentally to
  ZMQ_ROUTER_MANDATORY.


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0MQ version 3.2.0 (RC1), released on 2012/06/05
===============================================

Bug fixes
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* Fixed issue 264 - Potential bug with linger, messages dropped during
  socket close.

* Fixed issue 293 - libzmq doesn't follow the ZMTP/1.0 spec (did not
  set reserved bits to 0).

* Fixed issue 303 - Assertion failure in pgm_sender.cpp:102.

* Fixed issue 320 - Assertion failure in connect_session.cpp:96 when
  connecting epgm to an invalid endpoint.

* Fixed issue 325 - Assertion failure in xrep.cpp:93, when two sockets
  connect using the same identity.

* Fixed issue 327 - Assertion failure in mtrie.cpp:246, when
  unsubscribing from channel.

* Fixed issue 346 - Assertion failure in signaler.cpp:155, when using a
  closed socket.

* Fixed issue 328 - unsubscribe wrongly clears multiple subscriptions.

* Fixed issue 330 - IPC listener does not remove unix domain stream file
  when terminated.

* Fixed issue 334 - Memory leak in session_base.cpp:59.

* Fixed issue 369 - ROUTER cannot close/reopen while DEALER connected.

Operating systems
-----------------

* Fixed issue 301 - HPUX 11iv2 - build fails, CLOCK_MONOTONIC
  undefined.

* Fixed issue 324 - OS/X - build fails, ECANTROUTE undefined.

* Fixed issue 368 - Solaris / Sun C++ - build fails, no insert method
  in multimap classes.

* Fixed issue 366 - Windows - ports not freed after crash.

* Fixed issue 355 - Windows - build fails, MSVC solution file is out of
  date.

* Fixed issue 331 - FreeBSD 8 and 9 - getaddrinfo fails with
  EAI_BADFLAGS on AI_V4MAPPED flag.

* Fixed issue xxx - Added support for WinCE.

Performance
-----------

* Fixed issue xxx - Implemented atomic operations for ARMv7a (runs 15-20% faster).

API changes
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* Fixed issue 337 - Cleaned-up context API:

    zmq_ctx_new() - create new context (will deprecate zmq_init)
    zmq_ctx_destroy() - destroy context (will deprecate zmq_term)
    zmq_ctx_set() - set context property
    zmq_ctx_get() - get context property

* Fixed issue xxx - Cleaned-up message API:

    zmq_msg_send() - send a message (will deprecate zmq_sendmsg)
    zmq_msg_recv() - receive a message (will deprecate zmq_recvmsg)
    zmq_msg_more() - indicate whether this is final part of message
    zmq_msg_get() - get message property
    zmq_msg_set() - set message property

* Fixed issue xxx - Added context monitoring API:

    zmq_ctx_set_monitor() - configure monitor callback.

* Fixed issue xxx - Added unbind/disconnect API:

    zmq_unbind() - unbind socket.
    zmq_disconnect() - disconnect socket.

* Fixed issue xxx - Added ZMQ_TCP_ACCEPT_FILTER setsockopt() for listening TCP sockets.

* Fixed issue 336 - Removed sys: transport.

* Fixed issue 333 - Added zmq_device function back to API (was removed
  in 3.0).

* Fixed issue 340 - Add support for MAX_SOCKETS to new context API.


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OMQ version 3.1.0 (beta), released on 2011/12/18
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General information
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Based on community consensus, the 0MQ 3.1.x release reverts a number of
features introduced in version 3.0. The major reason for these changes is
improving backward compatibility with 0MQ 2.1.x.
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Development of the 0MQ 3.0.x series will be discontinued, and users are
encouraged to upgrade to 3.1.
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The 0MQ 3.1.x releases use ABI version 3.
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Reverted functionality
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The following functionality present in 0MQ 3.0 has been reverted:
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* Wire format changes. The 0MQ 3.1 wire format is identical to that of 0MQ
  2.1.
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* LABELs and COMMANDs have been removed.
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* Explicit identies are re-introduced, however they can be used only for
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* The ZMQ_ROUTER and ZMQ_DEALER socket types are once again aliases for
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New functionality
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* The zmq_getmsgopt() function has been introduced.
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* Experimental IPv6 support has been introduced. This is disabled by
  default, see the zmq_setsockopt() documentation for enabling it.
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Other changes
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* The default HWM for all socket types has been set to 1000.
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* Many bug fixes.
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Building
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* The dependency on libuuid has been removed.
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* Support for building on Android, and with MSVC 10 has been added.
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0MQ version 3.0.0 (alpha), released on 2011/07/12
=================================================
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New functionality
-----------------
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* A zmq_ctx_set_monitor() API to register a callback / event sink for changes
  in socket state.
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* POSIX-compliant zmq_send and zmq_recv introduced (uses raw buffer
  instead of message object).
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* ZMQ_MULTICAST_HOPS socket option added. Sets the appropriate field in
  IP headers of PGM packets.
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* Subscription forwarding. Instead of filtering on consumer, the
  subscription is moved as far as possible towards the publisher and
  filtering is done there.
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* ZMQ_XPUB, ZMQ_XSUB introduced. Allow to create subscription-
  forwarding-friendly intermediate devices.
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* Add sockopt ZMQ_RCVTIMEO/ZMQ_SNDTIMEO. Allow to set timeout for
  blocking send/recv calls.
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* A new LABEL flag was added to the wire format. The flag distinguishes
  message parts used by 0MQ (labels) from user payload message parts.
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* There is a new wire format for the REQ/REP pattern. First, the empty
  bottom-of-the-stack message part is not needed any more, the LABEL
  flag is used instead. Secondly, peer IDs are 32-bit integers rather
  than 17-byte UUIDs.
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* The REQ socket now drops duplicate replies.
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* Outstanding requests & replies associated with a client are dropped
  when the clients dies. This is a performance optimisation.
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* Introduced ZMQ_ROUTER and ZMQ_DEALER sockets. These mimic the
  functionality of ZMQ_ROUTER and ZMQ_DEALER in 0MQ/2.1.x. Guarantees
  backward compatibility for exsiting code.
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* Removed dependency on OS socketpair buffer size. No more asserts in
  mailbox.cpp because of low system limit of sockepair buffer size.
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API improvements
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* Obsolete constants ZMQ_UPSTREAM and ZMQ_DOWNSTREAM removed. Use
  ZMQ_PUSH and ZMQ_PULL instead.
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* Timeout in zmq_poll is in milliseconds instead of microseconds. This
  makes zmq_poll() compliant with POSIX poll()
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* ZMQ_MCAST_LOOP removed. There's no support for multicast over
  loopback any more. Use IPC or TCP isntead.
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* ZMQ_RECOVERY_IVL and ZMQ_RECOVERY_IVL_MSEC reconciled. The new option
  is named ZMQ_RECOVERY_IVL and the unit is milliseconds.
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* Option types changed. Most of the numeric types are now represented
  as 'int'.
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* ZMQ_HWM split into ZMQ_SNDHWM and ZMQ_RCVHWM. This makes it possible
  to control message flow separately for each direction.
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Less is More
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* Pre-built devices and zmq_device() removed. Should be made available
  as a separate project(s).
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* ZMQ_SWAP removed. Writing data to disk should be done on top of 0MQ,
  on inside it.
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* C++ binding removed from the core. Now it's a separate project, same
  as any other binding.
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Bug fixes
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* Many.
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Building
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* Make pkg-config dependency conditional.
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Distribution
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* Removed Debian packaging, which is now available at packages.debian.org
  or via apt-get.
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Older versions
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* See NEWS in ZeroMQ 2.1.x repository at http://github.com/zeromq/zeromq2-1.