src/topology_linux.cpp

   1 //$$CDS-header$$
   2
   3 #include <cds/os/topology.h>
   4
   5 #if CDS_OS_TYPE == CDS_OS_LINUX
   6
   7 #include <unistd.h>
   8 #include <fstream>
   9
  10 namespace cds { namespace OS { CDS_CXX11_INLINE_NAMESPACE namespace Linux {
  11
  12     unsigned int topology::s_nProcessorCount = 0;
  13
  14     void topology::init()
  15     {
  16          long n = ::sysconf( _SC_NPROCESSORS_ONLN );
  17          if ( n > 0 )
  18             s_nProcessorCount = n;
  19          else {
  20             try {
  21                 std::ifstream cpuinfo("/proc/cpuinfo");
  22                 std::string line;
  23
  24                 unsigned int nProcCount = 0;
  25                 while ( !cpuinfo.eof() ) {
  26                     std::getline(cpuinfo,line);
  27                     if (!line.size())
  28                         continue;
  29                     if ( line.find( "processor" ) !=0 )
  30                         continue;
  31                     ++nProcCount;
  32                 }
  33                 s_nProcessorCount = nProcCount;
  34             }
  35             catch ( std::exception& ex ) {
  36                 s_nProcessorCount = 1;
  37             }
  38          }
  39     }
  40
  41     void topology::fini()
  42     {}
  43 }}} // namespace cds::OS::Linux
  44
  45 #endif  // #if CDS_OS_TYPE == CDS_OS_LINUX