mirror of
https://github.com/wjakob/tbb.git
synced 2026-08-30 17:10:41 +08:00
Hans Johnson
e32d75f876
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.
------------------------------------------------------------------------
156 lines
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156 lines
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<li class="navelem"><a class="el" href="a00228.html">tbb</a></li><li class="navelem"><a class="el" href="a00101.html">queuing_rw_mutex</a></li><li class="navelem"><a class="el" href="a00132.html">scoped_lock</a></li> </ul>
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<div class="title">tbb::queuing_rw_mutex::scoped_lock Class Reference</div> </div>
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<p>The scoped locking pattern.
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<a href="a00132.html#details">More...</a></p>
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<p><code>#include <queuing_rw_mutex.h></code></p>
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Inheritance diagram for tbb::queuing_rw_mutex::scoped_lock:</div>
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Public Member Functions</h2></td></tr>
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<tr class="memitem:a1ae3792726dcff8da1f2c5366fb2b754"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="a00132.html#a1ae3792726dcff8da1f2c5366fb2b754">scoped_lock</a> ()</td></tr>
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<tr class="memdesc:a1ae3792726dcff8da1f2c5366fb2b754"><td class="mdescLeft"> </td><td class="mdescRight">Construct lock that has not acquired a mutex. <a href="#a1ae3792726dcff8da1f2c5366fb2b754">More...</a><br/></td></tr>
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<tr class="separator:a1ae3792726dcff8da1f2c5366fb2b754"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:af1b55ca1839c9c7c2cd779cd2dd9c474"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="af1b55ca1839c9c7c2cd779cd2dd9c474"></a>
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 </td><td class="memItemRight" valign="bottom"><a class="el" href="a00132.html#af1b55ca1839c9c7c2cd779cd2dd9c474">scoped_lock</a> (<a class="el" href="a00101.html">queuing_rw_mutex</a> &m, bool write=true)</td></tr>
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<tr class="memdesc:af1b55ca1839c9c7c2cd779cd2dd9c474"><td class="mdescLeft"> </td><td class="mdescRight">Acquire lock on given mutex. <br/></td></tr>
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<tr class="separator:af1b55ca1839c9c7c2cd779cd2dd9c474"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a6cb16cc55f884bbbd5a69430c47b288f"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a6cb16cc55f884bbbd5a69430c47b288f"></a>
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 </td><td class="memItemRight" valign="bottom"><a class="el" href="a00132.html#a6cb16cc55f884bbbd5a69430c47b288f">~scoped_lock</a> ()</td></tr>
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<tr class="memdesc:a6cb16cc55f884bbbd5a69430c47b288f"><td class="mdescLeft"> </td><td class="mdescRight">Release lock (if lock is held). <br/></td></tr>
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<tr class="separator:a6cb16cc55f884bbbd5a69430c47b288f"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ab4bf2fb86d6a418f9ea36474eb8893f9"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ab4bf2fb86d6a418f9ea36474eb8893f9"></a>
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void </td><td class="memItemRight" valign="bottom"><a class="el" href="a00132.html#ab4bf2fb86d6a418f9ea36474eb8893f9">acquire</a> (<a class="el" href="a00101.html">queuing_rw_mutex</a> &m, bool write=true)</td></tr>
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<tr class="memdesc:ab4bf2fb86d6a418f9ea36474eb8893f9"><td class="mdescLeft"> </td><td class="mdescRight">Acquire lock on given mutex. <br/></td></tr>
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<tr class="memitem:a4843d40dddc37c1aa3444e27d35d2433"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a4843d40dddc37c1aa3444e27d35d2433"></a>
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bool </td><td class="memItemRight" valign="bottom"><a class="el" href="a00132.html#a4843d40dddc37c1aa3444e27d35d2433">try_acquire</a> (<a class="el" href="a00101.html">queuing_rw_mutex</a> &m, bool write=true)</td></tr>
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<tr class="memdesc:a4843d40dddc37c1aa3444e27d35d2433"><td class="mdescLeft"> </td><td class="mdescRight">Acquire lock on given mutex if free (i.e. non-blocking) <br/></td></tr>
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void </td><td class="memItemRight" valign="bottom"><a class="el" href="a00132.html#a50fb02b77f02a01c74754d163157ec77">release</a> ()</td></tr>
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<tr class="memdesc:a50fb02b77f02a01c74754d163157ec77"><td class="mdescLeft"> </td><td class="mdescRight">Release lock. <br/></td></tr>
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<tr class="separator:a50fb02b77f02a01c74754d163157ec77"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ae0f28ecfbbc5f8b3024cd47048b72b5b"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="a00132.html#ae0f28ecfbbc5f8b3024cd47048b72b5b">upgrade_to_writer</a> ()</td></tr>
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<tr class="memdesc:ae0f28ecfbbc5f8b3024cd47048b72b5b"><td class="mdescLeft"> </td><td class="mdescRight">Upgrade reader to become a writer. <a href="#ae0f28ecfbbc5f8b3024cd47048b72b5b">More...</a><br/></td></tr>
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bool </td><td class="memItemRight" valign="bottom"><a class="el" href="a00132.html#af0af63035147a3d8422f8c8d7b8d2629">downgrade_to_reader</a> ()</td></tr>
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<tr class="memdesc:af0af63035147a3d8422f8c8d7b8d2629"><td class="mdescLeft"> </td><td class="mdescRight">Downgrade writer to become a reader. <br/></td></tr>
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</table>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
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<div class="textblock"><p>The scoped locking pattern. </p>
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<p>It helps to avoid the common problem of forgetting to release lock. It also nicely provides the "node" for queuing locks. </p>
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</div><h2 class="groupheader">Constructor & Destructor Documentation</h2>
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<td class="memname">tbb::queuing_rw_mutex::scoped_lock::scoped_lock </td>
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<td>(</td>
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<p>Construct lock that has not acquired a mutex. </p>
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<p>Equivalent to zero-initialization of *this. </p>
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<h2 class="groupheader">Member Function Documentation</h2>
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<td class="memname">bool tbb::queuing_rw_mutex::scoped_lock::upgrade_to_writer </td>
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<td>(</td>
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<p>Upgrade reader to become a writer. </p>
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<p>Returns whether the upgrade happened without releasing and re-acquiring the lock </p>
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<hr/>The documentation for this class was generated from the following file:<ul>
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<li>queuing_rw_mutex.h</li>
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</ul>
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</div><!-- contents -->
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Copyright © 2005-2016 Intel Corporation. All Rights Reserved.
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Intel, Pentium, Intel Xeon, Itanium, Intel XScale and VTune are
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registered trademarks or trademarks of Intel Corporation or its
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subsidiaries in the United States and other countries.
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* Other names and brands may be claimed as the property of others.
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