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T
Hans Johnson e32d75f876 ENH: Update to TBB 2017 (2016-09-08 release) 
The new release TBB is now under a new more
open license.
                                 Apache License
                           Version 2.0, January 2004
                        http://www.apache.org/licenses/

The list of most significant changes made over time in
Intel(R) Threading Building Blocks (Intel(R) TBB).

Intel TBB 2017
TBB_INTERFACE_VERSION == 9100

Changes (w.r.t. Intel TBB 4.4 Update 5):

- static_partitioner class is now a fully supported feature.
- async_node class is now a fully supported feature.
- Improved dynamic memory allocation replacement on Windows* OS to skip
    DLLs for which replacement cannot be done, instead of aborting.
- Intel TBB no longer performs dynamic memory allocation replacement
    for Microsoft* Visual Studio* 2008.
- For 64-bit platforms, quadrupled the worst-case limit on the amount
    of memory the Intel TBB allocator can handle.
- Added TBB_USE_GLIBCXX_VERSION macro to specify the version of GNU
    libstdc++ when it cannot be properly recognized, e.g. when used
    with Clang on Linux* OS. Inspired by a contribution from David A.
- Added graph/stereo example to demostrate tbb::flow::async_msg.
- Removed a few cases of excessive user data copying in the flow graph.
- Reworked split_node to eliminate unnecessary overheads.
- Added support for C++11 move semantics to the argument of
    tbb::parallel_do_feeder::add() method.
- Added C++11 move constructor and assignment operator to
    tbb::combinable template class.
- Added tbb::this_task_arena::max_concurrency() function and
    max_concurrency() method of class task_arena returning the maximal
    number of threads that can work inside an arena.
- Deprecated tbb::task_arena::current_thread_index() static method;
    use tbb::this_task_arena::current_thread_index() function instead.
- All examples for commercial version of library moved online:
    https://software.intel.com/en-us/product-code-samples. Examples are
    available as a standalone package or as a part of Intel(R) Parallel
    Studio XE or Intel(R) System Studio Online Samples packages.

Changes affecting backward compatibility:

- Renamed following methods and types in async_node class:
    Old                   New
    async_gateway_type => gateway_type
    async_gateway()    => gateway()
    async_try_put()    => try_put()
    async_reserve()    => reserve_wait()
    async_commit()     => release_wait()
- Internal layout of some flow graph nodes has changed; recompilation
    is recommended for all binaries that use the flow graph.

Preview Features:

- Added template class streaming_node to the flow graph API. It allows
    a flow graph to offload computations to other devices through
    streaming or offloading APIs.
- Template class opencl_node reimplemented as a specialization of
    streaming_node that works with OpenCL*.
- Added tbb::this_task_arena::isolate() function to isolate execution
    of a group of tasks or an algorithm from other tasks submitted
    to the scheduler.

Bugs fixed:

- Added a workaround for GCC bug #62258 in std::rethrow_exception()
    to prevent possible problems in case of exception propagation.
- Fixed parallel_scan to provide correct result if the initial value
    of an accumulator is not the operation identity value.
- Fixed a memory corruption in the memory allocator when it meets
    internal limits.
- Fixed the memory allocator on 64-bit platforms to align memory
    to 16 bytes by default for all allocations bigger than 8 bytes.
- As a workaround for crashes in the Intel TBB library compiled with
    GCC 6, added -flifetime-dse=1 to compilation options on Linux* OS.
- Fixed a race in the flow graph implementation.

Open-source contributions integrated:

- Enabling use of C++11 'override' keyword by Raf Schietekat.

------------------------------------------------------------------------
2016-09-28 21:12:48 +02:00

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<p>Fast, unfair, spinning reader-writer lock with backoff and writer-preference.
<a href="a00136.html#details">More...</a></p>
<p><code>#include &lt;spin_rw_mutex.h&gt;</code></p>
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void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00136.html#a51e207646300a4c242bb4aaa4e04e9b8">lock</a> ()</td></tr>
<tr class="memdesc:a51e207646300a4c242bb4aaa4e04e9b8"><td class="mdescLeft">&#160;</td><td class="mdescRight">Acquire writer lock. <br/></td></tr>
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<tr class="memdesc:ab6ec20b1ec43a49c8c2908984e35b5e8"><td class="mdescLeft">&#160;</td><td class="mdescRight">Try acquiring writer lock (non-blocking) <a href="#ab6ec20b1ec43a49c8c2908984e35b5e8">More...</a><br/></td></tr>
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typedef intptr_t&#160;</td><td class="memItemRight" valign="bottom"><b>state_t</b></td></tr>
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<tr class="memdesc:aa28625051072472ccd8a2b19405d6fb3"><td class="mdescLeft">&#160;</td><td class="mdescRight">State of lock. <a href="#aa28625051072472ccd8a2b19405d6fb3">More...</a><br/></td></tr>
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static const state_t&#160;</td><td class="memItemRight" valign="bottom"><b>WRITER</b> = 1</td></tr>
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static const state_t&#160;</td><td class="memItemRight" valign="bottom"><b>WRITER_PENDING</b> = 2</td></tr>
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static const state_t&#160;</td><td class="memItemRight" valign="bottom"><b>READERS</b> = ~(WRITER | WRITER_PENDING)</td></tr>
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static const state_t&#160;</td><td class="memItemRight" valign="bottom"><b>ONE_READER</b> = 4</td></tr>
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static const state_t&#160;</td><td class="memItemRight" valign="bottom"><b>BUSY</b> = WRITER | READERS</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Fast, unfair, spinning reader-writer lock with backoff and writer-preference. </p>
</div><h2 class="groupheader">Member Function Documentation</h2>
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<td class="memname">bool tbb::spin_rw_mutex_v3::try_lock </td>
<td>(</td>
<td class="paramname">)</td><td></td>
<td></td>
</tr>
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<p>Try acquiring writer lock (non-blocking) </p>
<p>Return true if lock acquired; false otherwise. </p>
</div>
</div>
<a class="anchor" id="ac932f65b0b66320688e7957ce9c3e2c1"></a>
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<td class="memname">bool tbb::spin_rw_mutex_v3::try_lock_read </td>
<td>(</td>
<td class="paramname">)</td><td></td>
<td></td>
</tr>
</table>
</td>
<td class="mlabels-right">
<span class="mlabels"><span class="mlabel">inline</span></span> </td>
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</div><div class="memdoc">
<p>Try acquiring reader lock (non-blocking) </p>
<p>Return true if reader lock acquired; false otherwise. </p>
</div>
</div>
<h2 class="groupheader">Member Data Documentation</h2>
<a class="anchor" id="aa28625051072472ccd8a2b19405d6fb3"></a>
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<td class="memname">state_t tbb::spin_rw_mutex_v3::state</td>
</tr>
</table>
</td>
<td class="mlabels-right">
<span class="mlabels"><span class="mlabel">protected</span></span> </td>
</tr>
</table>
</div><div class="memdoc">
<p>State of lock. </p>
<p>Bit 0 = writer is holding lock Bit 1 = request by a writer to acquire lock (hint to readers to wait) Bit 2..N = number of readers holding lock </p>
<p>Referenced by <a class="el" href="a00125.html#a99e279a995a51abfb87b865e886949f8">tbb::spin_rw_mutex_v3::scoped_lock::release()</a>, and <a class="el" href="a00136.html#ab04321ed2cdf12ac5825c54591028fc0">unlock()</a>.</p>
</div>
</div>
<hr/>The documentation for this class was generated from the following file:<ul>
<li>spin_rw_mutex.h</li>
</ul>
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