Determine number of available cores on all platforms.

src/platform-macos.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 153 matching lines @@
   USE(result);
   ASSERT(result == 0);
 }
 
 
 void OS::Sleep(int milliseconds) {
   usleep(1000 * milliseconds);
 }
 
 
+int OS::NumberOfCores() {
+  return sysconf(_SC_NPROCESSORS_ONLN);
+}
+
+
 void OS::Abort() {
   // Redirect to std abort to signal abnormal program termination
   abort();
 }
 
 
 void OS::DebugBreak() {
   asm("int $3");
 }
 
@@ skipping 727 matching lines @@
 
 
 void Sampler::Stop() {
   ASSERT(IsActive());
   SamplerThread::RemoveActiveSampler(this);
   SetActive(false);
 }
 
 
 } }  // namespace v8::internal