Persistent concurrent hash map data structure.

Implementation is based on concurrent_hash_map from Intel TBB library.

Test for persistent_concurrent_hash_map is built and executed only if
Intel TBB library found by CMake.

Update README for Intel TBB related tests.

Extend Docker images to support Intel TBB

Add clang-format checks for experimental folder

Fix CPack issue with deb package

Add abstraction for RW mutex

Add pmreorder test for concurrent_hash_map

Author: vinser52

CMakeLists.txt

@@ -144,6 +144,8 @@ if(BUILD_TESTS OR BUILD_EXAMPLES)
 	endif()
 
 	math(EXPR LIBPMEMOBJ_VERSION_NUM "${LIBPMEMOBJ_VERSION_PATCH} + ${LIBPMEMOBJ_VERSION_MINOR} * 100 + ${LIBPMEMOBJ_VERSION_MAJOR} * 10000")
+
+	find_package(TBB COMPONENTS tbb)
 endif()
 
 add_executable(check_license EXCLUDE_FROM_ALL utils/check_license/check-license.c)

README.md

@@ -44,6 +44,15 @@ $GEN is type of package generator and can be RPM or DEB
 
 CMAKE_INSTALL_PREFIX must be set to a destination were packages will be installed
 
+#### To use Intel(R) Threading Building Blocks library ####
+
+By default concurrent_hash_map uses pmem::obj::shared_mutex internally. But read-write mutex from Intel(R) Threading Building Blocks library can be used instead to achive better performance. To enable it in your application set the following compilation flag:
+- -DLIBPMEMOBJ_CPP_USE_TBB_RW_MUTEX=1
+
+If you want to build tests for concurrent_hash_map with read-write mutex from Intel(R) Threading Building Blocks library, run cmake with ```-DUSE_TBB=1 -DTBB_DIR=<Path to Intel TBB>/cmake``` option:
+
+Intel(R) Threading Building Blocks library can be downloaded from the official [release page](https://github.com/01org/tbb/releases).
+
 #### To use with Valgrind ####
 
 In order to build your application with libpmemobj-cpp and