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------------------------------------------------------------------------
The list of most significant changes made over time in
Intel(R) Threading Bulding Blocks (Intel(R) TBB).
------------------------------------------------------------------------
Intel TBB 4.1 Update 3
TBB_INTERFACE_VERSION == 6103
Changes (w.r.t. Intel TBB 4.1 Update 2):
- Binary files for Android* applications were added to the Linux* OS
package.
- Binary files for Windows Store* applications were added to the
Windows* OS package.
- Exact exception propagation (exception_ptr) support on Linux OS is
now turned on by default for GCC 4.4 and higher.
- Stopped implicit use of large memory pages by tbbmalloc (Linux-only).
Now use of large pages must be explicitly enabled with
scalable_allocation_mode() function or TBB_MALLOC_USE_HUGE_PAGES
environment variable.
Community Preview Features:
- Extended class task_arena constructor and method initialize() to
allow some concurrency to be reserved strictly for application
threads.
- New methods terminate() and is_active() were added to class
task_arena.
Bugs fixed:
- Fixed initialization of hashing helper constant in the hash
containers.
- Fixed possible stalls in concurrent invocations of
task_arena::execute() when no worker thread is available to make
progress.
Open-source contributions integrated:
- The fix for the GUI examples on OS X* systems by Raf Schietekat.
- Moved some power-of-2 calculations to functions to improve readability
by Raf Schietekat.
- C++11/Clang support improvements by arcata.
- ARM* platform isolation layer by Steve Capper, Leif Lindholm, Leo Lara
(ARM).
------------------------------------------------------------------------
Intel TBB 4.1 Update 2
TBB_INTERFACE_VERSION == 6102
Changes (w.r.t. Intel TBB 4.1 Update 1):
- Objects up to 128 MB are now cached by the tbbmalloc. Previously
the threshold was 8MB. Objects larger than 128 MB are still
processed by direct OS calls.
- concurrent_unordered_multiset and concurrent_unordered_multimap
have been added, based on Microsoft* PPL prototype.
- Ability to value-initialize a tbb::atomic<T> variable on construction
in C++11, with const expressions properly supported.
Community Preview Features:
- Added a possibility to wait until all worker threads terminate.
This is necessary before calling fork() from an application.
Bugs fixed:
- Fixed data race in tbbmalloc that might lead to memory leaks
for large object allocations.
- Fixed task_arena::enqueue() to use task_group_context of target arena.
- Improved implementation of 64 bit atomics on ia32.
------------------------------------------------------------------------
Intel TBB 4.1 Update 1
TBB_INTERFACE_VERSION == 6101
Changes (w.r.t. Intel TBB 4.1):
- concurrent_vector class now supports initialization/assignment
via C++11 initializer list feature (std::initializer_list<T>)
- Added implementation of the platform isolation layer based on
Intel compiler atomic built-ins; it is supposed to work on
any platform supported by compiler version 12.1 and newer.
- Using GetNativeSystemInfo() instead of GetSystemInfo() to support
more than 32 processors for 32-bit applications under WOW64.
- The following form of parallel_for:
parallel_for(first, last, [step,] f[, context]) now accepts an
optional partitioner parameter after the function f.
Backward-incompatible API changes:
- The library no longer injects tuple in to namespace std.
In previous releases, tuple was injected into namespace std by
flow_graph.h when std::tuple was not available. In this release,
flow_graph.h now uses tbb::flow::tuple. On platforms where
std::tuple is available, tbb::flow::tuple is typedef'ed to
std::tuple. On all other platforms, tbb::flow::tuple provides
a subset of the functionality defined by std::tuple. Users of
flow_graph.h may need to change their uses of std::tuple to
tbb::flow::tuple to ensure compatibility with non-C++11 compliant
compilers.
Bugs fixed:
- Fixed local observer to be able to override propagated CPU state and
to provide correct value of task_arena::current_slot() in callbacks.
------------------------------------------------------------------------
Intel TBB 4.1
TBB_INTERFACE_VERSION == 6100
Changes (w.r.t. Intel TBB 4.0 Update 5):
- _WIN32_WINNT must be set to 0x0501 or greater in order to use TBB
on Microsoft* Windows*.
- parallel_deterministic_reduce template function is fully supported.
- TBB headers can be used with C++0x/C++11 mode (-std=c++0x) of GCC
and Intel(R) Compiler.
- C++11 std::make_exception_ptr is used where available, instead of
std::copy_exception from earlier C++0x implementations.
- Improvements in the TBB allocator to reduce extra memory consumption.
- Partial refactoring of the task scheduler data structures.
- TBB examples allow more flexible specification of the thread number,
including arithmetic and geometric progression.
Bugs fixed:
- On Linux & OS X*, pre-built TBB binaries do not yet support exact
exception propagation via C++11 exception_ptr. To prevent run time
errors, by default TBB headers disable exact exception propagation
even if the C++ implementation provides exception_ptr.
Community Preview Features:
- Added: class task_arena, for work submission by multiple application
threads with thread-independent control of concurrency level.
- Added: task_scheduler_observer can be created as local to a master
thread, to observe threads that work on behalf of that master.
Local observers may have new on_scheduler_leaving() callback.
------------------------------------------------------------------------
Intel TBB 4.0 Update 5
TBB_INTERFACE_VERSION == 6005
Changes (w.r.t. Intel TBB 4.0 Update 4):
- Parallel pipeline optimization (directly storing small objects in the
interstage data buffers) limited to trivially-copyable types for
C++11 and a short list of types for earlier compilers.
- _VARIADIC_MAX switch is honored for TBB tuple implementation
and flow::graph nodes based on tuple.
- Support of Cocoa framework was added to the GUI examples on OS X*
systems.
Bugs fixed:
- Fixed a tv_nsec overflow bug in condition_variable::wait_for.
- Fixed execution order of enqueued tasks with different priorities.
- Fixed a bug with task priority changes causing lack of progress
for fire-and-forget tasks when TBB was initialized to use 1 thread.
- Fixed duplicate symbol problem when linking multiple compilation
units that include flow_graph.h on VC 10.
------------------------------------------------------------------------
Intel TBB 4.0 Update 4
TBB_INTERFACE_VERSION == 6004
Changes (w.r.t. Intel TBB 4.0 Update 3):
- The TBB memory allocator transparently supports large pages on Linux.
- A new flow_graph example, logic_sim, was added.
- Support for DirectX* 9 was added to GUI examples.
Community Preview Features:
- Added: aggregator, a new concurrency control mechanism.
Bugs fixed:
- The abort operation on concurrent_bounded_queue now leaves the queue
in a reusable state. If a bad_alloc or bad_last_alloc exception is
thrown while the queue is recovering from an abort, that exception
will be reported instead of user_abort on the thread on which it
occurred, and the queue will not be reusable.
- Steal limiting heuristic fixed to avoid premature stealing disabling
when large amount of __thread data is allocated on thread stack.
- Fixed a low-probability leak of arenas in the task scheduler.
- In STL-compatible allocator classes, the method construct() was fixed
to comply with C++11 requirements.
- Fixed a bug that prevented creation of fixed-size memory pools
smaller than 2M.
- Significantly reduced the amount of warnings from various compilers.
Open-source contributions integrated:
- Multiple improvements by Raf Schietekat.
- Basic support for Clang on OS X* by Blas Rodriguez Somoza.
- Fixes for warnings and corner-case bugs by Blas Rodriguez Somoza
and Edward Lam.
------------------------------------------------------------------------
Intel TBB 4.0 Update 3
TBB_INTERFACE_VERSION == 6003
Changes (w.r.t. Intel TBB 4.0 Update 2):
- Modifications to the low-level API for memory pools:
added support for aligned allocations;
pool policies reworked to allow backward-compatible extensions;
added a policy to not return memory space till destruction;
pool_reset() does not return memory space anymore.
- Class tbb::flow::graph_iterator added to iterate over all nodes
registered with a graph instance.
- multioutput_function_node has been renamed multifunction_node.
multifunction_node and split_node are now fully-supported features.
- For the tagged join node, the policy for try_put of an item with
already existing tag has been defined: the item will be rejected.
- Matching the behavior on Windows, on other platforms the optional
shared libraries (libtbbmalloc, libirml) now are also searched
only in the directory where libtbb is located.
- The platform isolation layer based on GCC built-ins is extended.
Backward-incompatible API changes:
- a graph reference parameter is now required to be passed to the
constructors of the following flow graph nodes: overwrite_node,
write_once_node, broadcast_node, and the CPF or_node.
- the following tbb::flow node methods and typedefs have been renamed:
Old New
join_node and or_node:
inputs() -> input_ports()
input_ports_tuple_type -> input_ports_type
multifunction_node and split_node:
ports_type -> output_ports_type
Bugs fixed:
- Not all logical processors were utilized on systems with more than
64 cores split by Windows into several processor groups.
------------------------------------------------------------------------
Intel TBB 4.0 Update 2 commercial-aligned release
TBB_INTERFACE_VERSION == 6002
Changes (w.r.t. Intel TBB 4.0 Update 1 commercial-aligned release):
- concurrent_bounded_queue now has an abort() operation that releases
threads involved in pending push or pop operations. The released
threads will receive a tbb::user_abort exception.
- Added Community Preview Feature: concurrent_lru_cache container,
a concurrent implementation of LRU (least-recently-used) cache.
Bugs fixed:
- fixed a race condition in the TBB scalable allocator.
- concurrent_queue counter wraparound bug was fixed, which occurred when
the number of push and pop operations exceeded ~>4 billion on IA32.
- fixed races in the TBB scheduler that could put workers asleep too
early, especially in presense of affinitized tasks.
------------------------------------------------------------------------
Intel TBB 4.0 Update 1 commercial-aligned release
TBB_INTERFACE_VERSION == 6000 (forgotten to increment)
Changes (w.r.t. Intel TBB 4.0 commercial-aligned release):
- Memory leaks fixed in binpack example.
- Improvements and fixes in the TBB allocator.
------------------------------------------------------------------------
Intel TBB 4.0 commercial-aligned release
TBB_INTERFACE_VERSION == 6000
Changes (w.r.t. Intel TBB 3.0 Update 8 commercial-aligned release):
- concurrent_priority_queue is now a fully supported feature.
Capacity control methods were removed.
- Flow graph is now a fully supported feature.
- A new memory backend has been implemented in the TBB allocator.
It can reuse freed memory for both small and large objects, and
returns unused memory blocks to the OS more actively.
- Improved partitioning algorithms for parallel_for and parallel_reduce
to better handle load imbalance.
- The convex_hull example has been refactored for reproducible
performance results.
- The major interface version has changed from 5 to 6.
Deprecated interfaces might be removed in future releases.
Community Preview Features:
- Added: serial subset, i.e. sequential implementations of TBB generic
algorithms (currently, only provided for parallel_for).
- Preview of new flow graph nodes:
or_node (accepts multiple inputs, forwards each input separately
to all successors),
split_node (accepts tuples, and forwards each element of a tuple
to a corresponding successor), and
multioutput_function_node (accepts one input, and passes the input
and a tuple of output ports to the function body to support outputs
to multiple successors).
- Added: memory pools for more control on memory source, grouping,
and collective deallocation.
------------------------------------------------------------------------
Intel TBB 3.0 Update 8 commercial-aligned release
TBB_INTERFACE_VERSION == 5008
Changes (w.r.t. Intel TBB 3.0 Update 7 commercial-aligned release):
- Task priorities become an official feature of TBB,
not community preview as before.
- Atomics API extended, and implementation refactored.
- Added task::set_parent() method.
- Added concurrent_unordered_set container.
Open-source contributions integrated:
- PowerPC support by Raf Schietekat.
- Fix of potential task pool overrun and other improvements
in the task scheduler by Raf Schietekat.
- Fix in parallel_for_each to work with std::set in Visual* C++ 2010.
Community Preview Features:
- Graph community preview feature was renamed to flow graph.
Multiple improvements in the implementation.
Binpack example was added for the feature.
- A number of improvements to concurrent_priority_queue.
Shortpath example was added for the feature.
- TBB runtime loaded functionality was added (Windows*-only).
It allows to specify which versions of TBB should be used,
as well as to set directories for the library search.
- parallel_deterministic_reduce template function was added.
------------------------------------------------------------------------
Intel TBB 3.0 Update 7 commercial-aligned release
TBB_INTERFACE_VERSION == 5006 (forgotten to increment)
Changes (w.r.t. Intel TBB 3.0 Update 6 commercial-aligned release):
- Added implementation of the platform isolation layer based on
GCC atomic built-ins; it is supposed to work on any platform
where GCC has these built-ins.
Community Preview Features:
- Graph's dining_philosophers example added.
- A number of improvements to graph and concurrent_priority_queue.
------------------------------------------------------------------------
Intel TBB 3.0 Update 6 commercial-aligned release
TBB_INTERFACE_VERSION == 5006
Changes (w.r.t. Intel TBB 3.0 Update 5 commercial-aligned release):
- Added Community Preview feature: task and task group priority, and
Fractal example demonstrating it.
- parallel_pipeline optimized for data items of small and large sizes.
- Graph's join_node is now parametrized with a tuple of up to 10 types.
- Improved performance of concurrent_priority_queue.
Open-source contributions integrated:
- Initial NetBSD support by Aleksej Saushev.
Bugs fixed:
- Failure to enable interoperability with Intel(R) Cilk(tm) Plus runtime
library, and a crash caused by invoking the interoperability layer
after one of the libraries was unloaded.
- Data race that could result in concurrent_unordered_map structure
corruption after call to clear() method.
- Stack corruption caused by PIC version of 64-bit CAS compiled by Intel
compiler on Linux.
- Inconsistency of exception propagation mode possible when application
built with Microsoft* Visual Studio* 2008 or earlier uses TBB built
with Microsoft* Visual Studio* 2010.
- Affinitizing master thread to a subset of available CPUs after TBB
scheduler was initialized tied all worker threads to the same CPUs.
- Method is_stolen_task() always returned 'false' for affinitized tasks.
- write_once_node and overwrite_node did not immediately send buffered
items to successors
------------------------------------------------------------------------
Intel TBB 3.0 Update 5 commercial-aligned release
TBB_INTERFACE_VERSION == 5005
Changes (w.r.t. Intel TBB 3.0 Update 4 commercial-aligned release):
- Added Community Preview feature: graph.
- Added automatic propagation of master thread FPU settings to
TBB worker threads.
- Added a public function to perform a sequentially consistent full
memory fence: tbb::atomic_fence() in tbb/atomic.h.
Bugs fixed:
- Data race that could result in scheduler data structures corruption
when using fire-and-forget tasks.
- Potential referencing of destroyed concurrent_hash_map element after
using erase(accessor&A) method with A acquired as const_accessor.
- Fixed a correctness bug in the convex hull example.
Open-source contributions integrated:
- Patch for calls to internal::atomic_do_once() by Andrey Semashev.
------------------------------------------------------------------------
Intel TBB 3.0 Update 4 commercial-aligned release
TBB_INTERFACE_VERSION == 5004
Changes (w.r.t. Intel TBB 3.0 Update 3 commercial-aligned release):
- Added Community Preview feature: concurrent_priority_queue.
- Fixed library loading to avoid possibility for remote code execution,
see http://www.microsoft.com/technet/security/advisory/2269637.mspx.
- Added support of more than 64 cores for appropriate Microsoft*
Windows* versions. For more details, see
http://msdn.microsoft.com/en-us/library/dd405503.aspx.
- Default number of worker threads is adjusted in accordance with
process affinity mask.
Bugs fixed:
- Calls of scalable_* functions from inside the allocator library
caused issues if the functions were overridden by another module.
- A crash occurred if methods run() and wait() were called concurrently
for an empty tbb::task_group (1736).
- The tachyon example exhibited build problems associated with
bug 554339 on Microsoft* Visual Studio* 2010. Project files were
modified as a partial workaround to overcome the problem. See
http://connect.microsoft.com/VisualStudio/feedback/details/554339.
------------------------------------------------------------------------
Intel TBB 3.0 Update 3 commercial-aligned release
TBB_INTERFACE_VERSION == 5003
Changes (w.r.t. Intel TBB 3.0 Update 2 commercial-aligned release):
- cache_aligned_allocator class reworked to use scalable_aligned_malloc.
- Improved performance of count() and equal_range() methods
in concurrent_unordered_map.
- Improved implementation of 64-bit atomic loads and stores on 32-bit
platforms, including compilation with VC 7.1.
- Added implementation of atomic operations on top of OSAtomic API
provided by OS X*.
- Removed gratuitous try/catch blocks surrounding thread function calls
in tbb_thread.
- Xcode* projects were added for sudoku and game_of_life examples.
- Xcode* projects were updated to work without TBB framework.
Bugs fixed:
- Fixed a data race in task scheduler destruction that on rare occasion
could result in memory corruption.
- Fixed idle spinning in thread bound filters in tbb::pipeline (1670).
Open-source contributions integrated:
- MinGW-64 basic support by brsomoza (partially).
- Patch for atomic.h by Andrey Semashev.
- Support for AIX & GCC on PowerPC by Giannis Papadopoulos.
- Various improvements by Raf Schietekat.
------------------------------------------------------------------------
Intel TBB 3.0 Update 2 commercial-aligned release
TBB_INTERFACE_VERSION == 5002
Changes (w.r.t. Intel TBB 3.0 Update 1 commercial-aligned release):
- Destructor of tbb::task_group class throws missing_wait exception
if there are tasks running when it is invoked.
- Interoperability layer with Intel Cilk Plus runtime library added
to protect TBB TLS in case of nested usage with Intel Cilk Plus.
- Compilation fix for dependent template names in concurrent_queue.
- Memory allocator code refactored to ease development and maintenance.
Bugs fixed:
- Improved interoperability with other Intel software tools on Linux in
case of dynamic replacement of memory allocator (1700)
- Fixed install issues that prevented installation on
Mac OS* X 10.6.4 (1711).
------------------------------------------------------------------------
Intel TBB 3.0 Update 1 commercial-aligned release
TBB_INTERFACE_VERSION == 5000 (forgotten to increment)
Changes (w.r.t. Intel TBB 3.0 commercial-aligned release):
- Decreased memory fragmentation by allocations bigger than 8K.
- Lazily allocate worker threads, to avoid creating unnecessary stacks.
Bugs fixed:
- TBB allocator used much more memory than malloc (1703) - see above.
- Deadlocks happened in some specific initialization scenarios
of the TBB allocator (1701, 1704).
- Regression in enumerable_thread_specific: excessive requirements
for object constructors.
- A bug in construction of parallel_pipeline filters when body instance
was a temporary object.
- Incorrect usage of memory fences on PowerPC and XBOX360 platforms.
- A subtle issue in task group context binding that could result
in cancelation signal being missed by nested task groups.
- Incorrect construction of concurrent_unordered_map if specified
number of buckets is not power of two.
- Broken count() and equal_range() of concurrent_unordered_map.
- Return type of postfix form of operator++ for hash map's iterators.
------------------------------------------------------------------------
Intel TBB 3.0 commercial-aligned release
TBB_INTERFACE_VERSION == 5000
Changes (w.r.t. Intel TBB 2.2 Update 3 commercial-aligned release):
- All open-source-release changes down to TBB 2.2 U3 below
were incorporated into this release.
------------------------------------------------------------------------
20100406 open-source release
Changes (w.r.t. 20100310 open-source release):
- Added support for Microsoft* Visual Studio* 2010, including binaries.
- Added a PDF file with recommended Design Patterns for TBB.
- Added parallel_pipeline function and companion classes and functions
that provide a strongly typed lambda-friendly pipeline interface.
- Reworked enumerable_thread_specific to use a custom implementation of
hash map that is more efficient for ETS usage models.
- Added example for class task_group; see examples/task_group/sudoku.
- Removed two examples, as they were long outdated and superceded:
pipeline/text_filter (use pipeline/square);
parallel_while/parallel_preorder (use parallel_do/parallel_preorder).
- PDF documentation updated.
- Other fixes and changes in code, tests, and examples.
Bugs fixed:
- Eliminated build errors with MinGW32.
- Fixed post-build step and other issues in VS projects for examples.
- Fixed discrepancy between scalable_realloc and scalable_msize that
caused crashes with malloc replacement on Windows.
------------------------------------------------------------------------
20100310 open-source release
Changes (w.r.t. Intel TBB 2.2 Update 3 commercial-aligned release):
- Version macros changed in anticipation of a future release.
- Directory structure aligned with Intel(R) C++ Compiler;
now TBB binaries reside in <arch>/<os_key>/[bin|lib]
(in TBB 2.x, it was [bin|lib]/<arch>/<os_key>).
- Visual Studio projects changed for examples: instead of separate set
of files for each VS version, now there is single 'msvs' directory
that contains workspaces for MS C++ compiler (<example>_cl.sln) and
Intel C++ compiler (<example>_icl.sln). Works with VS 2005 and above.
- The name versioning scheme for backward compatibility was improved;
now compatibility-breaking changes are done in a separate namespace.
- Added concurrent_unordered_map implementation based on a prototype
developed in Microsoft for a future version of PPL.
- Added PPL-compatible writer-preference RW lock (reader_writer_lock).
- Added TBB_IMPLEMENT_CPP0X macro to control injection of C++0x names
implemented in TBB into namespace std.
- Added almost-C++0x-compatible std::condition_variable, plus a bunch
of other C++0x classes required by condition_variable.
- With TBB_IMPLEMENT_CPP0X, tbb_thread can be also used as std::thread.
- task.cpp was split into several translation units to structure
TBB scheduler sources layout. Static data layout and library
initialization logic were also updated.
- TBB scheduler reworked to prevent master threads from stealing
work belonging to other masters.
- Class task was extended with enqueue() method, and slightly changed
semantics of methods spawn() and destroy(). For exact semantics,
refer to TBB Reference manual.
- task_group_context now allows for destruction by non-owner threads.
- Added TBB_USE_EXCEPTIONS macro to control use of exceptions in TBB
headers. It turns off (i.e. sets to 0) automatically if specified
compiler options disable exception handling.
- TBB is enabled to run on top of Microsoft's Concurrency Runtime
on Windows* 7 (via our worker dispatcher known as RML).
- Removed old unused busy-waiting code in concurrent_queue.
- Described the advanced build & test options in src/index.html.
- Warning level for GCC raised with -Wextra and a few other options.
- Multiple fixes and improvements in code, tests, examples, and docs.
Open-source contributions integrated:
- Xbox support by Roman Lut (Deep Shadows), though further changes are
required to make it working; e.g. post-2.1 entry points are missing.
- "Eventcount" by Dmitry Vyukov evolved into concurrent_monitor,
an internal class used in the implementation of concurrent_queue.
------------------------------------------------------------------------
Intel TBB 2.2 Update 3 commercial-aligned release
TBB_INTERFACE_VERSION == 4003
Changes (w.r.t. Intel TBB 2.2 Update 2 commercial-aligned release):
- PDF documentation updated.
Bugs fixed:
- concurrent_hash_map compatibility issue exposed on Linux in case
two versions of the container were used by different modules.
- enforce 16 byte stack alignment for consistence with GCC; required
to work correctly with 128-bit variables processed by SSE.
- construct() methods of allocator classes now use global operator new.
------------------------------------------------------------------------
Intel TBB 2.2 Update 2 commercial-aligned release
TBB_INTERFACE_VERSION == 4002
Changes (w.r.t. Intel TBB 2.2 Update 1 commercial-aligned release):
- parallel_invoke and parallel_for_each now take function objects
by const reference, not by value.
- Building TBB with /MT is supported, to avoid dependency on particular
versions of Visual C++* runtime DLLs. TBB DLLs built with /MT
are located in vc_mt directory.
- Class critical_section introduced.
- Improvements in exception support: new exception classes introduced,
all exceptions are thrown via an out-of-line internal method.
- Improvements and fixes in the TBB allocator and malloc replacement,
including robust memory identification, and more reliable dynamic
function substitution on Windows*.
- Method swap() added to class tbb_thread.
- Methods rehash() and bucket_count() added to concurrent_hash_map.
- Added support for Visual Studio* 2010 Beta2. No special binaries
provided, but CRT-independent DLLs (vc_mt) should work.
- Other fixes and improvements in code, tests, examples, and docs.
Open-source contributions integrated:
- The fix to build 32-bit TBB on Mac OS* X 10.6.
- GCC-based port for SPARC Solaris by Michailo Matijkiw, with use of
earlier work by Raf Schietekat.
Bugs fixed:
- 159 - TBB build for PowerPC* running Mac OS* X.
- 160 - IBM* Java segfault if used with TBB allocator.
- crash in concurrent_queue<char> (1616).
------------------------------------------------------------------------
Intel TBB 2.2 Update 1 commercial-aligned release
TBB_INTERFACE_VERSION == 4001
Changes (w.r.t. Intel TBB 2.2 commercial-aligned release):
- Incorporates all changes from open-source releases below.
- Documentation was updated.
- TBB scheduler auto-initialization now covers all possible use cases.
- concurrent_queue: made argument types of sizeof used in paddings
consistent with those actually used.
- Memory allocator was improved: supported corner case of user's malloc
calling scalable_malloc (non-Windows), corrected processing of
memory allocation requests during tbb memory allocator startup
(Linux).
- Windows malloc replacement has got better support for static objects.
- In pipeline setups that do not allow actual parallelism, execution
by a single thread is guaranteed, idle spinning eliminated, and
performance improved.
- RML refactoring and clean-up.
- New constructor for concurrent_hash_map allows reserving space for
a number of items.
- Operator delete() added to the TBB exception classes.
- Lambda support was improved in parallel_reduce.
- gcc 4.3 warnings were fixed for concurrent_queue.
- Fixed possible initialization deadlock in modules using TBB entities
during construction of global static objects.
- Copy constructor in concurrent_hash_map was fixed.
- Fixed a couple of rare crashes in the scheduler possible before
in very specific use cases.
- Fixed a rare crash in the TBB allocator running out of memory.
- New tests were implemented, including test_lambda.cpp that checks
support for lambda expressions.
- A few other small changes in code, tests, and documentation.
------------------------------------------------------------------------
20090809 open-source release
Changes (w.r.t. Intel TBB 2.2 commercial-aligned release):
- Fixed known exception safety issues in concurrent_vector.
- Better concurrency of simultaneous grow requests in concurrent_vector.
- TBB allocator further improves performance of large object allocation.
- Problem with source of text relocations was fixed on Linux
- Fixed bugs related to malloc replacement under Windows
- A few other small changes in code and documentation.
------------------------------------------------------------------------
Intel TBB 2.2 commercial-aligned release
TBB_INTERFACE_VERSION == 4000
Changes (w.r.t. Intel TBB 2.1 U4 commercial-aligned release):
- Incorporates all changes from open-source releases below.
- Architecture folders renamed from em64t to intel64 and from itanium
to ia64.
- Major Interface version changed from 3 to 4. Deprecated interfaces
might be removed in future releases.
- Parallel algorithms that use partitioners have switched to use
the auto_partitioner by default.
- Improved memory allocator performance for allocations bigger than 8K.
- Added new thread-bound filters functionality for pipeline.
- New implementation of concurrent_hash_map that improves performance
significantly.
- A few other small changes in code and documentation.
------------------------------------------------------------------------
20090511 open-source release
Changes (w.r.t. previous open-source release):
- Basic support for MinGW32 development kit.
- Added tbb::zero_allocator class that initializes memory with zeros.
It can be used as an adaptor to any STL-compatible allocator class.
- Added tbb::parallel_for_each template function as alias to parallel_do.
- Added more overloads for tbb::parallel_for.
- Added support for exact exception propagation (can only be used with
compilers that support C++0x std::exception_ptr).
- tbb::atomic template class can be used with enumerations.
- mutex, recursive_mutex, spin_mutex, spin_rw_mutex classes extended
with explicit lock/unlock methods.
- Fixed size() and grow_to_at_least() methods of tbb::concurrent_vector
to provide space allocation guarantees. More methods added for
compatibility with std::vector, including some from C++0x.
- Preview of a lambda-friendly interface for low-level use of tasks.
- scalable_msize function added to the scalable allocator (Windows only).
- Rationalized internal auxiliary functions for spin-waiting and backoff.
- Several tests undergo decent refactoring.
Changes affecting backward compatibility:
- Improvements in concurrent_queue, including limited API changes.
The previous version is deprecated; its functionality is accessible
via methods of the new tbb::concurrent_bounded_queue class.
- grow* and push_back methods of concurrent_vector changed to return
iterators; old semantics is deprecated.
------------------------------------------------------------------------
Intel TBB 2.1 Update 4 commercial-aligned release
TBB_INTERFACE_VERSION == 3016
Changes (w.r.t. Intel TBB 2.1 U3 commercial-aligned release):
- Added tests for aligned memory allocations and malloc replacement.
- Several improvements for better bundling with Intel(R) C++ Compiler.
- A few other small changes in code and documentaion.
Bugs fixed:
- 150 - request to build TBB examples with debug info in release mode.
- backward compatibility issue with concurrent_queue on Windows.
- dependency on VS 2005 SP1 runtime libraries removed.
- compilation of GUI examples under Xcode* 3.1 (1577).
- On Windows, TBB allocator classes can be instantiated with const types
for compatibility with MS implementation of STL containers (1566).
------------------------------------------------------------------------
20090313 open-source release
Changes (w.r.t. 20081109 open-source release):
- Includes all changes introduced in TBB 2.1 Update 2 & Update 3
commercial-aligned releases (see below for details).
- Added tbb::parallel_invoke template function. It runs up to 10
user-defined functions in parallel and waits for them to complete.
- Added a special library providing ability to replace the standard
memory allocation routines in Microsoft* C/C++ RTL (malloc/free,
global new/delete, etc.) with the TBB memory allocator.
Usage details are described in include/tbb/tbbmalloc_proxy.h file.
- Task scheduler switched to use new implementation of its core
functionality (deque based task pool, new structure of arena slots).
- Preview of Microsoft* Visual Studio* 2005 project files for
building the library is available in build/vsproject folder.
- Added tests for aligned memory allocations and malloc replacement.
- Added parallel_for/game_of_life.net example (for Windows only)
showing TBB usage in a .NET application.
- A number of other fixes and improvements to code, tests, makefiles,
examples and documents.
Bugs fixed:
- The same list as in TBB 2.1 Update 4 right above.
------------------------------------------------------------------------
Intel TBB 2.1 Update 3 commercial-aligned release
TBB_INTERFACE_VERSION == 3015
Changes (w.r.t. Intel TBB 2.1 U2 commercial-aligned release):
- Added support for aligned allocations to the TBB memory allocator.
- Added a special library to use with LD_PRELOAD on Linux* in order to
replace the standard memory allocation routines in C/C++ with the
TBB memory allocator.
- Added null_mutex and null_rw_mutex: no-op classes interface-compliant
to other TBB mutexes.
- Improved performance of parallel_sort, to close most of the serial gap
with std::sort, and beat it on 2 and more cores.
- A few other small changes.
Bugs fixed:
- the problem where parallel_for hanged after exception throw
if affinity_partitioner was used (1556).
- get rid of VS warnings about mbstowcs deprecation (1560),
as well as some other warnings.
- operator== for concurrent_vector::iterator fixed to work correctly
with different vector instances.
------------------------------------------------------------------------
Intel TBB 2.1 Update 2 commercial-aligned release
TBB_INTERFACE_VERSION == 3014
Changes (w.r.t. Intel TBB 2.1 U1 commercial-aligned release):
- Incorporates all open-source-release changes down to TBB 2.1 U1,
except for:
- 20081019 addition of enumerable_thread_specific;
- Warning level for Microsoft* Visual C++* compiler raised to /W4 /Wp64;
warnings found on this level were cleaned or suppressed.
- Added TBB_runtime_interface_version API function.
- Added new example: pipeline/square.
- Added exception handling and cancellation support
for parallel_do and pipeline.
- Added copy constructor and [begin,end) constructor to concurrent_queue.
- Added some support for beta version of Intel(R) Parallel Amplifier.
- Added scripts to set environment for cross-compilation of 32-bit
applications on 64-bit Linux with Intel(R) C++ Compiler.
- Fixed semantics of concurrent_vector::clear() to not deallocate
internal arrays. Fixed compact() to perform such deallocation later.
- Fixed the issue with atomic<T*> when T is incomplete type.
- Improved support for PowerPC* Macintosh*, including the fix
for a bug in masked compare-and-swap reported by a customer.
- As usual, a number of other improvements everywhere.
------------------------------------------------------------------------
20081109 open-source release
Changes (w.r.t. previous open-source release):
- Added new serial out of order filter for tbb::pipeline.
- Fixed the issue with atomic<T*>::operator= reported at the forum.
- Fixed the issue with using tbb::task::self() in task destructor
reported at the forum.
- A number of other improvements to code, tests, makefiles, examples
and documents.
Open-source contributions integrated:
- Changes in the memory allocator were partially integrated.
------------------------------------------------------------------------
20081019 open-source release
Changes (w.r.t. previous open-source release):
- Introduced enumerable_thread_specific<T>. This new class provides a
wrapper around native thread local storage as well as iterators and
ranges for accessing the thread local copies (1533).
- Improved support for Intel(R) Threading Analysis Tools
on Intel(R) 64 architecture.
- Dependency from Microsoft* CRT was integrated to the libraries using
manifests, to avoid issues if called from code that uses different
version of Visual C++* runtime than the library.
- Introduced new defines TBB_USE_ASSERT, TBB_USE_DEBUG,
TBB_USE_PERFORMANCE_WARNINGS, TBB_USE_THREADING_TOOLS.
- A number of other improvements to code, tests, makefiles, examples
and documents.
Open-source contributions integrated:
- linker optimization: /incremental:no .
------------------------------------------------------------------------
20080925 open-source release
Changes (w.r.t. previous open-source release):
- Same fix for a memory leak in the memory allocator as in TBB 2.1 U1.
- Improved support for lambda functions.
- Fixed more concurrent_queue issues reported at the forum.
- A number of other improvements to code, tests, makefiles, examples
and documents.
------------------------------------------------------------------------
Intel TBB 2.1 Update 1 commercial-aligned release
TBB_INTERFACE_VERSION == 3013
Changes (w.r.t. Intel TBB 2.1 commercial-aligned release):
- Fixed small memory leak in the memory allocator.
- Incorporates all open-source-release changes since TBB 2.1,
except for:
- 20080825 changes for parallel_do;
------------------------------------------------------------------------
20080825 open-source release
Changes (w.r.t. previous open-source release):
- Added exception handling and cancellation support for parallel_do.
- Added default HashCompare template argument for concurrent_hash_map.
- Fixed concurrent_queue.clear() issues due to incorrect assumption
about clear() being private method.
- Added the possibility to use TBB in applications that change
default calling conventions (Windows* only).
- Many improvements to code, tests, examples, makefiles and documents.
Bugs fixed:
- 120, 130 - memset declaration missed in concurrent_hash_map.h
------------------------------------------------------------------------
20080724 open-source release
Changes (w.r.t. previous open-source release):
- Inline assembly for atomic operations improved for gcc 4.3
- A few more improvements to the code.
------------------------------------------------------------------------
20080709 open-source release
Changes (w.r.t. previous open-source release):
- operator=() was added to the tbb_thread class according to
the current working draft for std::thread.
- Recognizing SPARC* in makefiles for Linux* and Sun Solaris*.
Bugs fixed:
- 127 - concurrent_hash_map::range fixed to split correctly.
Open-source contributions integrated:
- fix_set_midpoint.diff by jyasskin
- SPARC* support in makefiles by Raf Schietekat
------------------------------------------------------------------------
20080622 open-source release
Changes (w.r.t. previous open-source release):
- Fixed a hang that rarely happened on Linux
during deinitialization of the TBB scheduler.
- Improved support for Intel(R) Thread Checker.
- A few more improvements to the code.
------------------------------------------------------------------------
Intel TBB 2.1 commercial-aligned release
TBB_INTERFACE_VERSION == 3011
Changes (w.r.t. Intel TBB 2.0 U3 commercial-aligned release):
- All open-source-release changes down to, and including, TBB 2.0 below,
were incorporated into this release.
------------------------------------------------------------------------
20080605 open-source release
Changes (w.r.t. previous open-source release):
- Explicit control of exported symbols by version scripts added on Linux.
- Interfaces polished for exception handling & algorithm cancellation.
- Cache behavior improvements in the scalable allocator.
- Improvements in text_filter, polygon_overlay, and other examples.
- A lot of other stability improvements in code, tests, and makefiles.
- First release where binary packages include headers/docs/examples, so
binary packages are now self-sufficient for using TBB.
Open-source contributions integrated:
- atomics patch (partially).
- tick_count warning patch.
Bugs fixed:
- 118 - fix for boost compatibility.
- 123 - fix for tbb_machine.h.
------------------------------------------------------------------------
20080512 open-source release
Changes (w.r.t. previous open-source release):
- Fixed a problem with backward binary compatibility
of debug Linux builds.
- Sun* Studio* support added.
- soname support added on Linux via linker script. To restore backward
binary compatibility, *.so -> *.so.2 softlinks should be created.
- concurrent_hash_map improvements - added few new forms of insert()
method and fixed precondition and guarantees of erase() methods.
Added runtime warning reporting about bad hash function used for
the container. Various improvements for performance and concurrency.
- Cancellation mechanism reworked so that it does not hurt scalability.
- Algorithm parallel_do reworked. Requirement for Body::argument_type
definition removed, and work item argument type can be arbitrarily