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Embedded Multicore Building Blocks (EMB²)

Version 0.3.2

Features:

  • Added central spinlock implementation for C/C++ and removed existing (decentral) ones

Changes and improvements:

  • Reworked and optimized hazard pointer implementation
  • Adjusted interfaces of value pool and object pool
  • Replaced C style casts

Bug fixes:

  • Fixed ordering of destruction and deallocation in value pool
  • Fixed potential use of uninitialized memory in WaitFreeArrayValuePool and LockFreeTreeValuePool

Build system:

  • Given user the ability to append compiler flags
  • Let Cmake return an error on Doxygen warnings when WARNINGS_ARE_ERRORS is enabled
  • Fixed cpplint warnings

Documentation:

  • Added mutex concept
  • Corrected library ordering/names in README (section "Using the Library")
  • Improved exception messages
  • Fixed typos in condition_var_test.cc

Version 0.3.1

Features:

  • None

Changes and improvements:

  • Removed one function argument from algorithms::Invoke
  • Added "explicit" specifier to base type constructor of Atomic<BaseType*>
  • Added "const" qualifier to dereference operator and member access operator of AtomicPointer<>
  • Changed AtomicBase<>::CompareAndSwap to atomically return expected value
  • Replaced constant in dataflow_cpp_test_simple.cc with corresponding macro
  • Added initialization of atomic variable in hazard_pointer_test.cc to avoid warning with GCC 5.1
  • Changed initial value of allocated_object_from_different_thread
  • Added tests for ID Pool and check for memory leaks
  • Updated unit test for the UniqueLock::Swap

Bug fixes:

  • Fixed implementation of ID pool (provided fewer elements than specified by capacity)
  • Fixed unsigned overflow bug in timed wait function of condition variables
  • Fixed implementation of UniqueLock::Swap

Build system:

  • Improved CMake output for automatic initialization option
  • Fixed cpplint and unsigned/signed warnings

Documentation:

  • Fixed documentation of UniqueLock class
  • Updated README file

Version 0.3.0

Features:

  • mtapi_c:
    • Implemented action plugin API
    • Implemented load balancing for distributed/heterogeneous systems
    • Implemented OpenCL action plugin
    • Implemented network action plugin
  • mtapi_cpp:
    • Added support for distributed/heterogeneous systems

Changes and improvements:

  • mtapi_c:
    • Added multi-instance task support and test
    • Improved notification of worker threads
  • mtapi_cpp:
    • Moved interface for homogeneous systems to tasks_cpp
  • base_cpp:
    • Moved tick types to internal namespace and added duration typedefs
  • dataflow_cpp:
    • Removed spinlocks
    • Simplified registration of processes (only sources need to be added)
    • Increased number of task queues in unit test
    • Added assertion in unit test
    • Improved exception handling
    • Removed stray include
    • Refactored to use tasks_cpp
  • algorithms_cpp:
    • Restricted partitioners to random access iterators
    • Added unit tests for partitioners on large ranges
    • Refactored to use tasks_cpp

Bug fixes:

  • Fixed unit test for dataflow_cpp
  • Fixed wait-free SPSC queue

Build system:

  • Fixed compilation for newer CMake Versions (>= 3.1)
  • Changed task test to avoid Jenkins timeout
  • Changed CMakeLists to avoid error if policy is unknown
  • Added mtapi_network_c and mtapi_opencl_c to root CMakeLists
  • Added tasks_cpp to test scripts / batch file
  • Fixed cpplint warnings

Documentation:

  • Extended tutorial and examples regarding support for distributed/heterogeneous systems including plugins and new task interface
  • Added Doxygen documentation for mtapi_opencl_c and mtapi_network_c
  • Added Doxygen documentation to mtapi_ext.h
  • Updated README and removed limitation to homogeneous systems
  • Added missing concurrency tags in mtapi_cpp

Version 0.2.3

Features:

  • None

Changes and improvements:

  • Changed use of partitioners in ForEach, Reduce, Scan, Count, and MergeSort
  • Added guard definition to QuickSort and MergeSort requiring random access iterators as inputs
  • Unified behavior of algorithms on empty input
  • Cleaned up MergeSort and Scan
  • Extended computation of number of cores to take into account affinities
  • Changed MTAPI_CHECK_STATUS in examples to use exit() instead of abort()
  • Added overload for std::exception::what() in embb::base::Exception
  • Added missing include in execution_policy.cc
  • Added tests for Thread::ID (base_cpp), ExecutionPolicy (mtapi_cpp), and error cases in mtapi_c
  • Added tests on empty and negative input ranges in algorithms

Bug fixes:

  • Fixed freeing of temporary buffer in MergeSortAllocate
  • Fixed minor bugs in mtapi_c
  • Fixed paths in Doxyfile.in template

Build system:

  • Added option to CMake to toggle automatic initialization of MTAPI C++ interface
  • Changed run_tests_cygwin script to work with /bin/sh
  • Modified create_tarball.sh script for completely automatic tarball creation
  • Removed cppcheck warnings
  • Removed cpplint warnings
  • Updated partest

Documentation:

  • Added paragraphs in tutorial and README regarding performance impact of automatic initialization of MTAPI C++ interface
  • Removed automatic collapsing of trees in Doxygen documentation due to incompatibility with latest versions of Doxygen
  • Modified reference manual to consistently use function object concept
  • Added description of default node attributes in mtapi_c and fixed typo in mtapi_cpp documentation
  • Modified paragraph on documentation in README and fixed typo

Version 0.2.2

Features:

  • None

Changes and improvements:

  • Added checks for memory leaks in tests
  • Added block size support in MergeSort
  • Renamed all platform specific defines to EMBB_PLATFORM_*
  • Changed all checks for platform specific defines to checks for EMBB_* defines
  • Replaced C++11 initializer lists in examples with C++03 compliant statements
  • Extended unit tests for MPMC queue with checks for relative order
  • Added check for result of pthread_attr_destroy
  • Added assert in embb_tss_get
  • Moved ExecutionPolicy from algorithms to mtapi_cpp, removed Affinity

Bug fixes:

  • Fixed 64bit problem in atomics
  • Fixed bug in dataflow_cpp causing network to hang
  • Fixed bug in conversion of core_set
  • Fixed fetch-and-add implementation to support armv7-a
  • Fixed missing freeing of mutex attributes in case of error
  • Fixed bug where closure was allocated with Allocation::New but deleted with operator delete
  • Fixed inconsistent naming of unit test cases
  • Fixed memory allocation in hazard pointer implementation by replacing calls to new and delete with EMB²-specific functions
  • Fixed memory leak in tests for containers
  • Fixed affinity implementation for FreeBSD

Build system:

  • Removed cppcheck warnings
  • Removed cpplint warnings

Documentation:

  • Improved documentation of default values and priorities
  • Revised template argument names in base_cpp and containers_cpp
  • Moved ExecutionPolicy to CPP_MTAPI and Identity to CPP_ALGORITHMS Doxygen group
  • Fixed description of token limit in tutorial
  • Added Clang support to README
  • Mentioned the ability to cross compile in README
  • Added link to release files in README
  • Minor corrections in README
  • Updated copyright notice
  • Changed year in tutorial.tex to 2015

Version 0.2.1

Features:

  • Added embb_core_count_available() implementation for FreeBSD.

Changes and improvements:

  • None

Bug fixes:

  • Fixed implementation of atomic operations on ARM.
  • Fixed bug in HelpScan routine of hazard pointer implementation.
  • Replaced inclusion of non-standard header malloc.h with stdlib.h.

Build system:

  • Added initial support for Clang.
  • Added initial support for Travis.
  • Fixed "Policy CMP0026 is not set" warning of CMake >= 3.0.2.
  • Made build independent of build-dir / source-dir location.
  • Fixed remaining GCC, Clang, MSVC, and cpplint warnings.
  • Replaced /bin/bash with /usr/bin/env bash in scripts.
  • Added executable flag to shell scripts.
  • Omitted Doxygen "Makefiles" from tarball.
  • Included patchlevel in name of installation directory on Linux.
  • Added LaTeX .bbl and .blg files to ignore list.

Documentation:

  • Updated README file, created CHANGELOG file, and added markdown support.
  • Corrected license in COPYING file (BSD 2-clause).
  • Changed default Doxygen level for API to two.
  • Added check for Doxyfile.in (if not present, do not add Doxygen target).
  • Added PDF image of building blocks and updated tutorial.tex.
  • Fixed typos and wording.

Version 0.2.0

  • Initial version of open source release
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