| <html> |
| <head> |
| <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> |
| <title>Changes since boost 1.40</title> |
| <link rel="stylesheet" href="../../../doc/src/boostbook.css" type="text/css"> |
| <meta name="generator" content="DocBook XSL Stylesheets V1.75.2"> |
| <link rel="home" href="../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> |
| <link rel="up" href="../thread.html" title="Chapter 22. Thread"> |
| <link rel="prev" href="../thread.html" title="Chapter 22. Thread"> |
| <link rel="next" href="thread_management.html" title="Thread Management"> |
| </head> |
| <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> |
| <table cellpadding="2" width="100%"><tr> |
| <td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../boost.png"></td> |
| <td align="center"><a href="../../../index.html">Home</a></td> |
| <td align="center"><a href="../../../libs/libraries.htm">Libraries</a></td> |
| <td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> |
| <td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> |
| <td align="center"><a href="../../../more/index.htm">More</a></td> |
| </tr></table> |
| <hr> |
| <div class="spirit-nav"> |
| <a accesskey="p" href="../thread.html"><img src="../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../thread.html"><img src="../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="thread_management.html"><img src="../../../doc/src/images/next.png" alt="Next"></a> |
| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h2 class="title" style="clear: both"> |
| <a name="thread.changes"></a><a class="link" href="changes.html" title="Changes since boost 1.40">Changes since boost 1.40</a> |
| </h2></div></div></div> |
| <p> |
| The 1.41.0 release of Boost adds futures to the thread library. There are also |
| a few minor changes. |
| </p> |
| <a name="thread.changes.changes_since_boost_1_35"></a><h4> |
| <a name="id2644651"></a> |
| <a class="link" href="changes.html#thread.changes.changes_since_boost_1_35">Changes since boost |
| 1.35</a> |
| </h4> |
| <p> |
| The 1.36.0 release of Boost includes a few new features in the thread library: |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"> |
| <li class="listitem"> |
| New generic <a class="link" href="synchronization.html#thread.synchronization.lock_functions.lock_multiple" title="Non-member function lock(Lockable1,Lockable2,...)"><code class="computeroutput"><span class="identifier">lock</span><span class="special">()</span></code></a> |
| and <a class="link" href="synchronization.html#thread.synchronization.lock_functions.try_lock_multiple" title="Non-member function try_lock(Lockable1,Lockable2,...)"><code class="computeroutput"><span class="identifier">try_lock</span><span class="special">()</span></code></a> |
| functions for locking multiple mutexes at once. |
| </li> |
| <li class="listitem"> |
| Rvalue reference support for move semantics where the compilers supports |
| it. |
| </li> |
| <li class="listitem"> |
| A few bugs fixed and missing functions added (including the serious win32 |
| condition variable bug). |
| </li> |
| <li class="listitem"> |
| <code class="computeroutput"><span class="identifier">scoped_try_lock</span></code> types are |
| now backwards-compatible with Boost 1.34.0 and previous releases. |
| </li> |
| <li class="listitem"> |
| Support for passing function arguments to the thread function by supplying |
| additional arguments to the <a class="link" href="thread_management.html#thread.thread_management.thread" title="Class thread"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">thread</span></code></a> constructor. |
| </li> |
| <li class="listitem"> |
| Backwards-compatibility overloads added for <code class="computeroutput"><span class="identifier">timed_lock</span></code> |
| and <code class="computeroutput"><span class="identifier">timed_wait</span></code> functions |
| to allow use of <code class="computeroutput"><span class="identifier">xtime</span></code> for |
| timeouts. |
| </li> |
| </ul></div> |
| <a name="thread.changes.changes_since_boost_1_34"></a><h4> |
| <a name="id2644831"></a> |
| <a class="link" href="changes.html#thread.changes.changes_since_boost_1_34">Changes since boost |
| 1.34</a> |
| </h4> |
| <p> |
| Almost every line of code in <span class="bold"><strong>Boost.Thread</strong></span> |
| has been changed since the 1.34 release of boost. However, most of the interface |
| changes have been extensions, so the new code is largely backwards-compatible |
| with the old code. The new features and breaking changes are described below. |
| </p> |
| <a name="thread.changes.new_features"></a><h4> |
| <a name="id2644866"></a> |
| <a class="link" href="changes.html#thread.changes.new_features">New Features</a> |
| </h4> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"> |
| <li class="listitem"> |
| Instances of <a class="link" href="thread_management.html#thread.thread_management.thread" title="Class thread"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">thread</span></code></a> and of the various lock |
| types are now movable. |
| </li> |
| <li class="listitem"> |
| Threads can be interrupted at <a class="link" href="thread_management.html#interruption_points"><span class="emphasis"><em>interruption |
| points</em></span></a>. |
| </li> |
| <li class="listitem"> |
| Condition variables can now be used with any type that implements the |
| <a class="link" href="synchronization.html#thread.synchronization.mutex_concepts.lockable" title="Lockable Concept"><code class="computeroutput"><span class="identifier">Lockable</span></code> concept</a>, through the |
| use of <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">condition_variable_any</span></code> (<code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">condition</span></code> is a <code class="computeroutput"><span class="keyword">typedef</span></code> |
| to <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">condition_variable_any</span></code>, provided for |
| backwards compatibility). <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">condition_variable</span></code> |
| is provided as an optimization, and will only work with <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">unique_lock</span><span class="special"><</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">mutex</span><span class="special">></span></code> (<code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">mutex</span><span class="special">::</span><span class="identifier">scoped_lock</span></code>). |
| </li> |
| <li class="listitem"> |
| Thread IDs are separated from <a class="link" href="thread_management.html#thread.thread_management.thread" title="Class thread"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">thread</span></code></a>, so a thread can obtain |
| it's own ID (using <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">this_thread</span><span class="special">::</span><span class="identifier">get_id</span><span class="special">()</span></code>), and IDs can be used as keys in associative |
| containers, as they have the full set of comparison operators. |
| </li> |
| <li class="listitem"> |
| Timeouts are now implemented using the Boost DateTime library, through |
| a typedef <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">system_time</span></code> for absolute timeouts, and |
| with support for relative timeouts in many cases. <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">xtime</span></code> |
| is supported for backwards compatibility only. |
| </li> |
| <li class="listitem"> |
| Locks are implemented as publicly accessible templates <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">lock_guard</span></code>, |
| <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">unique_lock</span></code>, <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">shared_lock</span></code>, |
| and <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">upgrade_lock</span></code>, which are templated on |
| the type of the mutex. The <a class="link" href="synchronization.html#thread.synchronization.mutex_concepts.lockable" title="Lockable Concept"><code class="computeroutput"><span class="identifier">Lockable</span></code> concept</a> has been extended |
| to include publicly available <a class="link" href="synchronization.html#thread.synchronization.mutex_concepts.lockable.lock" title="void lock()"><code class="computeroutput"><span class="identifier">lock</span><span class="special">()</span></code></a> |
| and <a class="link" href="synchronization.html#thread.synchronization.mutex_concepts.lockable.unlock" title="void unlock()"><code class="computeroutput"><span class="identifier">unlock</span><span class="special">()</span></code></a> |
| member functions, which are used by the lock types. |
| </li> |
| </ul></div> |
| <a name="thread.changes.breaking_changes"></a><h4> |
| <a name="id2645360"></a> |
| <a class="link" href="changes.html#thread.changes.breaking_changes">Breaking Changes</a> |
| </h4> |
| <p> |
| The list below should cover all changes to the public interface which break |
| backwards compatibility. |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"> |
| <li class="listitem"> |
| <a class="link" href="synchronization.html#thread.synchronization.mutex_types.try_mutex" title="Typedef try_mutex"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">try_mutex</span></code></a> has been removed, and |
| the functionality subsumed into <a class="link" href="synchronization.html#thread.synchronization.mutex_types.mutex" title="Class mutex"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">mutex</span></code></a>. <a class="link" href="synchronization.html#thread.synchronization.mutex_types.try_mutex" title="Typedef try_mutex"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">try_mutex</span></code></a> is left as a <code class="computeroutput"><span class="keyword">typedef</span></code>, but is no longer a separate class. |
| </li> |
| <li class="listitem"> |
| <a class="link" href="synchronization.html#thread.synchronization.mutex_types.recursive_try_mutex" title="Typedef recursive_try_mutex"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">recursive_try_mutex</span></code></a> has been removed, |
| and the functionality subsumed into <a class="link" href="synchronization.html#thread.synchronization.mutex_types.recursive_mutex" title="Class recursive_mutex"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">recursive_mutex</span></code></a>. <a class="link" href="synchronization.html#thread.synchronization.mutex_types.recursive_try_mutex" title="Typedef recursive_try_mutex"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">recursive_try_mutex</span></code></a> is left as |
| a <code class="computeroutput"><span class="keyword">typedef</span></code>, but is no longer |
| a separate class. |
| </li> |
| <li class="listitem"> |
| <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">detail</span><span class="special">::</span><span class="identifier">thread</span><span class="special">::</span><span class="identifier">lock_ops</span></code> has been removed. Code that |
| relies on the <code class="computeroutput"><span class="identifier">lock_ops</span></code> |
| implementation detail will no longer work, as this has been removed, as |
| it is no longer necessary now that mutex types now have public <a class="link" href="synchronization.html#thread.synchronization.mutex_concepts.lockable.lock" title="void lock()"><code class="computeroutput"><span class="identifier">lock</span><span class="special">()</span></code></a> |
| and <a class="link" href="synchronization.html#thread.synchronization.mutex_concepts.lockable.unlock" title="void unlock()"><code class="computeroutput"><span class="identifier">unlock</span><span class="special">()</span></code></a> |
| member functions. |
| </li> |
| <li class="listitem"> |
| <code class="computeroutput"><span class="identifier">scoped_lock</span></code> constructors |
| with a second parameter of type <code class="computeroutput"><span class="keyword">bool</span></code> |
| are no longer provided. With previous boost releases, |
| <pre class="programlisting"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">mutex</span><span class="special">::</span><span class="identifier">scoped_lock</span> <span class="identifier">some_lock</span><span class="special">(</span><span class="identifier">some_mutex</span><span class="special">,</span><span class="keyword">false</span><span class="special">);</span></pre> |
| could be used to create a lock object that was associated with a mutex, |
| but did not lock it on construction. This facility has now been replaced |
| with the constructor that takes a <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">defer_lock_type</span></code> |
| as the second parameter: |
| <pre class="programlisting"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">mutex</span><span class="special">::</span><span class="identifier">scoped_lock</span> <span class="identifier">some_lock</span><span class="special">(</span><span class="identifier">some_mutex</span><span class="special">,</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">defer_lock</span><span class="special">);</span></pre> |
| </li> |
| <li class="listitem"> |
| The <code class="computeroutput"><span class="identifier">locked</span><span class="special">()</span></code> |
| member function of the <code class="computeroutput"><span class="identifier">scoped_lock</span></code> |
| types has been renamed to <a class="link" href="synchronization.html#thread.synchronization.locks.unique_lock.owns_lock" title="bool owns_lock() const"><code class="computeroutput"><span class="identifier">owns_lock</span><span class="special">()</span></code></a>. |
| </li> |
| <li class="listitem"> |
| You can no longer obtain a <a class="link" href="thread_management.html#thread.thread_management.thread" title="Class thread"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">thread</span></code></a> instance representing the |
| current thread: a default-constructed <a class="link" href="thread_management.html#thread.thread_management.thread" title="Class thread"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">thread</span></code></a> object is not associated |
| with any thread. The only use for such a thread object was to support the |
| comparison operators: this functionality has been moved to <a class="link" href="thread_management.html#thread.thread_management.thread.id" title="Class boost::thread::id"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">thread</span><span class="special">::</span><span class="identifier">id</span></code></a>. |
| </li> |
| <li class="listitem"> |
| The broken <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">read_write_mutex</span></code> has been replaced with |
| <a class="link" href="synchronization.html#thread.synchronization.mutex_types.shared_mutex" title="Class shared_mutex"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">shared_mutex</span></code></a>. |
| </li> |
| <li class="listitem"> |
| <a class="link" href="synchronization.html#thread.synchronization.mutex_types.mutex" title="Class mutex"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">mutex</span></code></a> is now never recursive. |
| For Boost releases prior to 1.35 <a class="link" href="synchronization.html#thread.synchronization.mutex_types.mutex" title="Class mutex"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">mutex</span></code></a> was recursive on Windows |
| and not on POSIX platforms. |
| </li> |
| <li class="listitem"> |
| When using a <a class="link" href="synchronization.html#thread.synchronization.mutex_types.recursive_mutex" title="Class recursive_mutex"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">recursive_mutex</span></code></a> with a call to |
| <a class="link" href="synchronization.html#thread.synchronization.condvar_ref.condition_variable_any.wait" title="template<typename lock_type> void wait(lock_type& lock)"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">condition_variable_any</span><span class="special">::</span><span class="identifier">wait</span><span class="special">()</span></code></a>, |
| the mutex is only unlocked one level, and not completely. This prior behaviour |
| was not guaranteed and did not feature in the tests. |
| </li> |
| </ul></div> |
| </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 © 2007 -8 Anthony Williams<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> |
| <hr> |
| <div class="spirit-nav"> |
| <a accesskey="p" href="../thread.html"><img src="../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../thread.html"><img src="../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="thread_management.html"><img src="../../../doc/src/images/next.png" alt="Next"></a> |
| </div> |
| </body> |
| </html> |
