src/init.cpp

   1 /*
   2     This file is a part of libcds - Concurrent Data Structures library
   3
   4     (C) Copyright Maxim Khizhinsky (libcds.dev@gmail.com) 2006-2017
   5
   6     Source code repo: http://github.com/khizmax/libcds/
   7     Download: http://sourceforge.net/projects/libcds/files/
   8
   9     Redistribution and use in source and binary forms, with or without
  10     modification, are permitted provided that the following conditions are met:
  11
  12     * Redistributions of source code must retain the above copyright notice, this
  13       list of conditions and the following disclaimer.
  14
  15     * Redistributions in binary form must reproduce the above copyright notice,
  16       this list of conditions and the following disclaimer in the documentation
  17       and/or other materials provided with the distribution.
  18
  19     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  20     AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21     IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  22     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  23     FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24     DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  25     SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  26     CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  27     OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  28     OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29 */
  30
  31 #include <cds/init.h>
  32 #include <cds/algo/atomic.h>
  33
  34 #if CDS_OS_INTERFACE == CDS_OSI_WINDOWS && CDS_OS_TYPE != CDS_OS_MINGW
  35 #   if CDS_COMPILER == CDS_COMPILER_MSVC || CDS_COMPILER == CDS_COMPILER_INTEL
  36 #       include <cds/threading/details/msvc_manager.h>
  37 #   endif
  38 #   include <cds/threading/details/wintls_manager.h>
  39 #else   // CDS_OS_INTERFACE != CDS_OSI_WINDOWS
  40 #   if CDS_COMPILER == CDS_COMPILER_GCC || CDS_COMPILER == CDS_COMPILER_CLANG || CDS_COMPILER == CDS_COMPILER_INTEL
  41 #       include <cds/threading/details/gcc_manager.h>
  42 #   endif
  43 #   include <cds/threading/details/pthread_manager.h>
  44 #endif
  45
  46 #ifdef CDS_CXX11_THREAD_LOCAL_SUPPORT
  47 #   include <cds/threading/details/cxx11_manager.h>
  48 #endif
  49
  50 namespace cds {
  51
  52 #if CDS_OS_INTERFACE == CDS_OSI_WINDOWS
  53     CDS_EXPORT_API DWORD cds::threading::wintls::Manager::Holder::m_key = TLS_OUT_OF_INDEXES;
  54 #   if CDS_COMPILER == CDS_COMPILER_MSVC || CDS_COMPILER == CDS_COMPILER_INTEL
  55         __declspec( thread ) threading::msvc_internal::ThreadDataPlaceholder threading::msvc_internal::s_threadData;
  56         __declspec(thread) threading::ThreadData * threading::msvc_internal::s_pThreadData = nullptr;
  57 #   endif
  58 #else
  59     pthread_key_t threading::pthread::Manager::Holder::m_key;
  60
  61 #   if CDS_COMPILER == CDS_COMPILER_GCC || CDS_COMPILER == CDS_COMPILER_CLANG
  62         __thread threading::gcc_internal::ThreadDataPlaceholder CDS_DATA_ALIGNMENT(8) threading::gcc_internal::s_threadData;
  63         __thread threading::ThreadData * threading::gcc_internal::s_pThreadData = nullptr;
  64 #   endif
  65 #endif
  66
  67 #ifdef CDS_CXX11_THREAD_LOCAL_SUPPORT
  68     thread_local threading::cxx11_internal::ThreadDataPlaceholder CDS_DATA_ALIGNMENT(8) threading::cxx11_internal::s_threadData;
  69     thread_local threading::ThreadData * threading::cxx11_internal::s_pThreadData = nullptr;
  70 #endif
  71
  72     namespace details {
  73         static atomics::atomic<size_t> s_nInitCallCount(0);
  74
  75         bool CDS_EXPORT_API init_first_call()
  76         {
  77             return s_nInitCallCount.fetch_add(1, atomics::memory_order_relaxed) == 0;
  78         }
  79
  80         bool CDS_EXPORT_API fini_last_call()
  81         {
  82             if ( s_nInitCallCount.fetch_sub( 1, atomics::memory_order_relaxed ) == 1 ) {
  83                 atomics::atomic_thread_fence( atomics::memory_order_release );
  84                 return true;
  85             }
  86             return false;
  87         }
  88     } // namespace details
  89
  90 }   // namespace cds