core(alloc): drop unused code, use memalign() functions instead of hacks

valgrind provides better detection without memory buffer hacks

CMakeLists.txt

@@ -551,6 +551,7 @@ if(UNIX)
   endif()
   include(CheckFunctionExists)
   include(CheckIncludeFile)
+  include(CheckSymbolExists)
 
   if(NOT APPLE)
     CHECK_INCLUDE_FILE(pthread.h HAVE_LIBPTHREAD)
@@ -566,6 +567,12 @@ if(UNIX)
   else()
     set(HAVE_LIBPTHREAD YES)
   endif()
+
+  CHECK_SYMBOL_EXISTS(posix_memalign stdlib.h HAVE_POSIX_MEMALIGN)
+  CHECK_INCLUDE_FILE(malloc.h HAVE_MALLOC_H)
+  if(HAVE_MALLOC_H)
+    CHECK_SYMBOL_EXISTS(memalign malloc.h HAVE_MEMALIGN)
+  endif()
 endif()
 
 include(cmake/OpenCVPCHSupport.cmake)

modules/core/CMakeLists.txt

@@ -45,6 +45,16 @@ endif()
 if(ITT_INCLUDE_DIRS)
   ocv_module_include_directories(${ITT_INCLUDE_DIRS})
 endif()
+if(HAVE_POSIX_MEMALIGN)
+  ocv_append_sourge_file_compile_definitions(${CMAKE_CURRENT_SOURCE_DIR}/src/alloc.cpp "HAVE_POSIX_MEMALIGN=1")
+endif()
+if(HAVE_MALLOC_H)
+  ocv_append_sourge_file_compile_definitions(${CMAKE_CURRENT_SOURCE_DIR}/src/alloc.cpp "HAVE_MALLOC_H=1")
+endif()
+if(HAVE_MEMALIGN)
+  ocv_append_sourge_file_compile_definitions(${CMAKE_CURRENT_SOURCE_DIR}/src/alloc.cpp "HAVE_MEMALIGN=1")
+endif()
+
 ocv_create_module(${extra_libs})
 
 ocv_target_link_libraries(${the_module}

modules/core/src/precomp.hpp

@@ -148,10 +148,6 @@ BinaryFunc getCopyMaskFunc(size_t esz);
 /* maximal average node_count/hash_size ratio beyond which hash table is resized */
 #define  CV_SPARSE_HASH_RATIO    3
 
-#if defined _WIN32
-void deleteThreadAllocData();
-#endif
-
 inline Size getContinuousSize_( int flags, int cols, int rows, int widthScale )
 {
     int64 sz = (int64)cols * rows * widthScale;

modules/core/src/system.cpp

@@ -1532,7 +1532,6 @@ BOOL WINAPI DllMain(HINSTANCE, DWORD fdwReason, LPVOID lpReserved)
         {
             // Not allowed to free resources if lpReserved is non-null
             // http://msdn.microsoft.com/en-us/library/windows/desktop/ms682583.aspx
-            cv::deleteThreadAllocData();
             cv::getTlsStorage().releaseThread();
         }
     }