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<div class="section" title="Revision History">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="boost_asio.history"></a><a class="link" href="history.html" title="Revision History"> Revision History</a>
</h2></div></div></div>
<a name="boost_asio.history.asio_1_4_4___boost_1_42"></a><h4>
<a name="id1179103"></a>
<a class="link" href="history.html#boost_asio.history.asio_1_4_4___boost_1_42">Asio 1.4.4 / Boost
1.42</a>
</h4>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
Added a new HTTP Server 4 example illustrating the use of stackless coroutines
with Asio.
</li>
<li class="listitem">
Changed handler allocation and invocation to use <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">addressof</span></code>
to get the address of handler objects, rather than applying <code class="computeroutput"><span class="keyword">operator</span><span class="special">&</span></code>
directly (<a href="https://svn.boost.org/trac/boost/ticket/2977" target="_top">#2977</a>).
</li>
<li class="listitem">
Restricted MSVC buffer debugging workaround to 2008, as it causes a crash
with 2010 beta 2 (<a href="https://svn.boost.org/trac/boost/ticket/3796" target="_top">#3796</a>,
<a href="https://svn.boost.org/trac/boost/ticket/3822" target="_top">#3822</a>).
</li>
<li class="listitem">
Fixed a problem with the lifetime of handler memory, where Windows needs
the <code class="computeroutput"><span class="identifier">OVERLAPPED</span></code> structure
to be valid until both the initiating function call has returned and the
completion packet has been delivered.
</li>
<li class="listitem">
Don't block signals while performing system calls, but instead restart the
calls if they are interrupted.
</li>
<li class="listitem">
Documented the guarantee made by strand objects with respect to order of
handler invocation.
</li>
<li class="listitem">
Changed strands to use a pool of implementations, to make copying of strands
cheaper.
</li>
<li class="listitem">
Ensured that kqueue support is enabled for BSD platforms (<a href="https://svn.boost.org/trac/boost/ticket/3626" target="_top">#3626</a>).
</li>
<li class="listitem">
Added a <code class="computeroutput"><span class="identifier">boost_</span></code> prefix to
the <code class="computeroutput"><span class="keyword">extern</span> <span class="string">"C"</span></code>
thread entry point function (<a href="https://svn.boost.org/trac/boost/ticket/3809" target="_top">#3809</a>).
</li>
<li class="listitem">
In <code class="computeroutput"><span class="identifier">getaddrinfo</span></code> emulation,
only check the socket type (<code class="computeroutput"><span class="identifier">SOCK_STREAM</span></code>
or <code class="computeroutput"><span class="identifier">SOCK_DGRAM</span></code>) if a service
name has been specified. This should allow the emulation to work with raw
sockets.
</li>
<li class="listitem">
Added a workaround for some broken Windows firewalls that make a socket appear
bound to 0.0.0.0 when it is in fact bound to 127.0.0.1.
</li>
<li class="listitem">
Applied a fix for reported excessive CPU usage under Solaris (<a href="https://svn.boost.org/trac/boost/ticket/3670" target="_top">#3670</a>).
</li>
<li class="listitem">
Added some support for platforms that use older compilers such as g++ 2.95
(<a href="https://svn.boost.org/trac/boost/ticket/3743" target="_top">#3743</a>).
</li>
</ul></div>
<a name="boost_asio.history.asio_1_4_3___boost_1_40"></a><h4>
<a name="id1179344"></a>
<a class="link" href="history.html#boost_asio.history.asio_1_4_3___boost_1_40">Asio 1.4.3 / Boost
1.40</a>
</h4>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
Added a new ping example to illustrate the use of ICMP sockets.
</li>
<li class="listitem">
Changed the <code class="computeroutput"><span class="identifier">buffered</span><span class="special">*</span><span class="identifier">_stream</span><span class="special"><></span></code>
templates to treat 0-byte reads and writes as no-ops, to comply with the
documented type requirements for <code class="computeroutput"><span class="identifier">SyncReadStream</span></code>,
<code class="computeroutput"><span class="identifier">AsyncReadStream</span></code>, <code class="computeroutput"><span class="identifier">SyncWriteStream</span></code> and <code class="computeroutput"><span class="identifier">AsyncWriteStream</span></code>.
</li>
<li class="listitem">
Changed some instances of the <code class="computeroutput"><span class="keyword">throw</span></code>
keyword to <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">throw_exception</span><span class="special">()</span></code>
to allow Asio to be used when exception support is disabled. Note that the
SSL wrappers still require exception support (<a href="https://svn.boost.org/trac/boost/ticket/2754" target="_top">#2754</a>).
</li>
<li class="listitem">
Made Asio compatible with the OpenSSL 1.0 beta (<a href="https://svn.boost.org/trac/boost/ticket/3256" target="_top">#3256</a>).
</li>
<li class="listitem">
Eliminated a redundant system call in the Solaris <code class="literal">/dev/poll</code>
backend.
</li>
<li class="listitem">
Fixed a bug in resizing of the bucket array in the internal hash maps (<a href="https://svn.boost.org/trac/boost/ticket/3095" target="_top">#3095</a>).
</li>
<li class="listitem">
Ensured correct propagation of the error code when a synchronous accept fails
(<a href="https://svn.boost.org/trac/boost/ticket/3216" target="_top">#3216</a>).
</li>
<li class="listitem">
Ensured correct propagation of the error code when a synchronous read or
write on a Windows HANDLE fails.
</li>
<li class="listitem">
Fixed failures reported when <code class="computeroutput"><span class="identifier">_GLIBCXX_DEBUG</span></code>
is defined (<a href="https://svn.boost.org/trac/boost/ticket/3098" target="_top">#3098</a>).
</li>
<li class="listitem">
Fixed custom memory allocation support for timers (<a href="https://svn.boost.org/trac/boost/ticket/3107" target="_top">#3107</a>).
</li>
<li class="listitem">
Tidied up various warnings reported by g++ (<a href="https://svn.boost.org/trac/boost/ticket/1341" target="_top">#1341</a>,
<a href="https://svn.boost.org/trac/boost/ticket/2618" target="_top">#2618</a>).
</li>
<li class="listitem">
Various documentation improvements, including more obvious hyperlinks to
function overloads, header file information, examples for the handler type
requirements, and adding enum values to the index (<a href="https://svn.boost.org/trac/boost/ticket/3157" target="_top">#3157</a>,
<a href="https://svn.boost.org/trac/boost/ticket/2620" target="_top">#2620</a>).
</li>
</ul></div>
<a name="boost_asio.history.asio_1_4_2___boost_1_39"></a><h4>
<a name="id1179609"></a>
<a class="link" href="history.html#boost_asio.history.asio_1_4_2___boost_1_39">Asio 1.4.2 / Boost
1.39</a>
</h4>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
Implement automatic resizing of the bucket array in the internal hash maps.
This is to improve performance for very large numbers of asynchronous operations
and also to reduce memory usage for very small numbers. A new macro <code class="computeroutput"><span class="identifier">BOOST_ASIO_HASH_MAP_BUCKETS</span></code> may be used
to tweak the sizes used for the bucket arrays. (N.B. this feature introduced
a bug which was fixed in Asio 1.4.3 / Boost 1.40.)
</li>
<li class="listitem">
Add performance optimisation for the Windows IOCP backend for when no timers
are used.
</li>
<li class="listitem">
Prevent locale settings from affecting formatting of TCP and UDP endpoints
(<a href="https://svn.boost.org/trac/boost/ticket/2682" target="_top">#2682</a>).
</li>
<li class="listitem">
Fix a memory leak that occurred when an asynchronous SSL operation's completion
handler threw an exception (<a href="https://svn.boost.org/trac/boost/ticket/2910" target="_top">#2910</a>).
</li>
<li class="listitem">
Fix the implementation of <code class="computeroutput"><span class="identifier">io_control</span><span class="special">()</span></code> so that it adheres to the documented type
requirements for IoControlCommand (<a href="https://svn.boost.org/trac/boost/ticket/2820" target="_top">#2820</a>).
</li>
<li class="listitem">
Fix incompatibility between Asio and ncurses.h (<a href="https://svn.boost.org/trac/boost/ticket/2156" target="_top">#2156</a>).
</li>
<li class="listitem">
On Windows, specifically handle the case when an overlapped <code class="computeroutput"><span class="identifier">ReadFile</span></code> call fails with <code class="computeroutput"><span class="identifier">ERROR_MORE_DATA</span></code>. This enables a hack where
a <code class="computeroutput"><span class="identifier">windows</span><span class="special">::</span><span class="identifier">stream_handle</span></code> can be used with a message-oriented
named pipe (<a href="https://svn.boost.org/trac/boost/ticket/2936" target="_top">#2936</a>).
</li>
<li class="listitem">
Fix system call wrappers to always clear the error on success, as POSIX allows
successful system calls to modify errno (<a href="https://svn.boost.org/trac/boost/ticket/2953" target="_top">#2953</a>).
</li>
<li class="listitem">
Don't include termios.h if <code class="computeroutput"><span class="identifier">BOOST_ASIO_DISABLE_SERIAL_PORT</span></code>
is defined (<a href="https://svn.boost.org/trac/boost/ticket/2917" target="_top">#2917</a>).
</li>
<li class="listitem">
Cleaned up some more MSVC level 4 warnings (<a href="https://svn.boost.org/trac/boost/ticket/2828" target="_top">#2828</a>).
</li>
<li class="listitem">
Various documentation fixes (<a href="https://svn.boost.org/trac/boost/ticket/2871" target="_top">#2871</a>).
</li>
</ul></div>
<a name="boost_asio.history.asio_1_4_1___boost_1_38"></a><h4>
<a name="id1179826"></a>
<a class="link" href="history.html#boost_asio.history.asio_1_4_1___boost_1_38">Asio 1.4.1 / Boost
1.38</a>
</h4>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
Improved compatibility with some Windows firewall software.
</li>
<li class="listitem">
Ensured arguments to <code class="computeroutput"><span class="identifier">windows</span><span class="special">::</span><span class="identifier">overlapped_ptr</span><span class="special">::</span><span class="identifier">complete</span><span class="special">()</span></code> are correctly passed to the completion
handler (<a href="https://svn.boost.org/trac/boost/ticket/2614" target="_top">#2614</a>).
</li>
<li class="listitem">
Fixed a link problem and multicast failure on QNX (<a href="https://svn.boost.org/trac/boost/ticket/2504" target="_top">#2504</a>,
<a href="https://svn.boost.org/trac/boost/ticket/2530" target="_top">#2530</a>).
</li>
<li class="listitem">
Fixed a compile error in SSL support on MinGW / g++ 3.4.5.
</li>
<li class="listitem">
Drop back to using a pipe for notification if eventfd is not available at
runtime on Linux (<a href="https://svn.boost.org/trac/boost/ticket/2683" target="_top">#2683</a>).
</li>
<li class="listitem">
Various minor bug and documentation fixes (<a href="https://svn.boost.org/trac/boost/ticket/2534" target="_top">#2534</a>,
<a href="https://svn.boost.org/trac/boost/ticket/2541" target="_top">#2541</a>,
<a href="https://svn.boost.org/trac/boost/ticket/2607" target="_top">#2607</a>,
<a href="https://svn.boost.org/trac/boost/ticket/2617" target="_top">#2617</a>,
<a href="https://svn.boost.org/trac/boost/ticket/2619" target="_top">#2619</a>).
</li>
</ul></div>
<a name="boost_asio.history.asio_1_4_0___boost_1_37"></a><h4>
<a name="id1179968"></a>
<a class="link" href="history.html#boost_asio.history.asio_1_4_0___boost_1_37">Asio 1.4.0 / Boost
1.37</a>
</h4>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
Enhanced CompletionCondition concept with the signature <code class="computeroutput"><span class="identifier">size_t</span>
<span class="identifier">CompletionCondition</span><span class="special">(</span><span class="identifier">error_code</span> <span class="identifier">ec</span><span class="special">,</span> <span class="identifier">size_t</span> <span class="identifier">total</span><span class="special">)</span></code>,
where the return value indicates the maximum number of bytes to be transferred
on the next read or write operation. (The old CompletionCondition signature
is still supported for backwards compatibility).
</li>
<li class="listitem">
New windows::overlapped_ptr class to allow arbitrary overlapped I/O functions
(such as TransmitFile) to be used with Asio.
</li>
<li class="listitem">
On recent versions of Linux, an eventfd descriptor is now used (rather than
a pipe) to interrupt a blocked select/epoll reactor.
</li>
<li class="listitem">
Added const overloads of lowest_layer().
</li>
<li class="listitem">
Synchronous read, write, accept and connect operations are now thread safe
(meaning that it is now permitted to perform concurrent synchronous operations
on an individual socket, if supported by the OS).
</li>
<li class="listitem">
Reactor-based io_service implementations now use lazy initialisation to reduce
the memory usage of an io_service object used only as a message queue.
</li>
</ul></div>
<a name="boost_asio.history.asio_1_2_0___boost_1_36"></a><h4>
<a name="id1180081"></a>
<a class="link" href="history.html#boost_asio.history.asio_1_2_0___boost_1_36">Asio 1.2.0 / Boost
1.36</a>
</h4>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
Added support for serial ports.
</li>
<li class="listitem">
Added support for UNIX domain sockets.
</li>
<li class="listitem">
Added support for raw sockets and ICMP.
</li>
<li class="listitem">
Added wrappers for POSIX stream-oriented file descriptors (excluding regular
files).
</li>
<li class="listitem">
Added wrappers for Windows stream-oriented <code class="computeroutput"><span class="identifier">HANDLE</span></code>s
such as named pipes (requires <code class="computeroutput"><span class="identifier">HANDLE</span></code>s
that work with I/O completion ports).
</li>
<li class="listitem">
Added wrappers for Windows random-access <code class="computeroutput"><span class="identifier">HANDLE</span></code>s
such as files (requires <code class="computeroutput"><span class="identifier">HANDLE</span></code>s
that work with I/O completion ports).
</li>
<li class="listitem">
Added support for reactor-style operations (i.e. they report readiness but
perform no I/O) using a new <code class="computeroutput"><span class="identifier">null_buffers</span></code>
type.
</li>
<li class="listitem">
Added an iterator type for bytewise traversal of buffer sequences.
</li>
<li class="listitem">
Added new <code class="computeroutput"><span class="identifier">read_until</span><span class="special">()</span></code>
and <code class="computeroutput"><span class="identifier">async_read_until</span><span class="special">()</span></code>
overloads that take a user-defined function object for locating message boundaries.
</li>
<li class="listitem">
Added an experimental two-lock queue (enabled by defining <code class="computeroutput"><span class="identifier">BOOST_ASIO_ENABLE_TWO_LOCK_QUEUE</span></code>)
that may provide better <code class="computeroutput"><span class="identifier">io_service</span></code>
scalability across many processors.
</li>
<li class="listitem">
Various fixes, performance improvements, and more complete coverage of the
custom memory allocation support.
</li>
</ul></div>
<a name="boost_asio.history.asio_1_0_0___boost_1_35"></a><h4>
<a name="id1180264"></a>
<a class="link" href="history.html#boost_asio.history.asio_1_0_0___boost_1_35">Asio 1.0.0 / Boost
1.35</a>
</h4>
<p>
First release of Asio as part of Boost.
</p>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright © 2003 - 2010 Christopher M. Kohlhoff<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
</div></td>
</tr></table>
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