Dynare++: use portable C++11 primitive for detecting the number of logical processors

dynare++/kord/journal.cc

@@ -7,6 +7,7 @@
 #include <cmath>
 #include <ctime>
 #include <limits>
+#include <thread>
 
 #ifndef _WIN32
 # include <sys/time.h>     // For getrusage()
@@ -72,16 +73,6 @@ SystemResources::availablePhysicalPages()
 #endif
 }
 
-long
-SystemResources::onlineProcessors()
-{
-#ifndef _WIN32
-  return sysconf(_SC_NPROCESSORS_ONLN);
-#else
-  return -1; // FIXME
-#endif
-}
-
 long
 SystemResources::availableMemory()
 {
@@ -226,11 +217,12 @@ Journal::printHeader()
   utsname info;
   uname(&info);
   *this << info.sysname << " " << info.release << " " << info.version << " "
-        << info.machine << ", processors online: " << SystemResources::onlineProcessors();
+        << info.machine;
 #else
-  *this << "(not implemented for MinGW)";
+  *this << "Windows";
 #endif
-  *this << "\n\nStart time: ";
+  *this << ", processors online: " << std::thread::hardware_concurrency()
+        << "\n\nStart time: ";
   std::time_t t = std::time(nullptr);
   *this << std::put_time(std::localtime(&t), "%c %Z")
         << "\n\n"

dynare++/kord/journal.hh

@@ -23,7 +23,6 @@ struct SystemResources
   static long pageSize();
   static long physicalPages();
   static long availablePhysicalPages();
-  static long onlineProcessors();
   static long availableMemory();
 
   double load_avg;