Move NumberOfProcessorsOnline from CPU to OS

src/platform-posix.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Platform-specific code for POSIX goes here. This is not a platform on its
 // own, but contains the parts which are the same across the POSIX platforms
 // Linux, MacOS, FreeBSD, OpenBSD, NetBSD and QNX.
 
 #include <dlfcn.h>
 #include <pthread.h>
@@ skipping 39 matching lines @@
 
 // 0 is never a valid thread id.
 static const pthread_t kNoThread = (pthread_t) 0;
 
 
 unsigned OS::CpuFeaturesImpliedByPlatform() {
   return 0;  // Nothing special.
 }
 
 
+int OS::NumberOfProcessorsOnline() {
+  return static_cast<int>(sysconf(_SC_NPROCESSORS_ONLN));
+}
+
+
 // Maximum size of the virtual memory.  0 means there is no artificial
 // limit.
 
 intptr_t OS::MaxVirtualMemory() {
   struct rlimit limit;
   int result = getrlimit(RLIMIT_DATA, &limit);
   if (result != 0) return 0;
 #if V8_OS_NACL
   // The NaCl compiler doesn't like resource.h constants.
   if (static_cast<int>(limit.rlim_cur) == -1) return 0;
@@ skipping 681 matching lines @@
 
 void Thread::SetThreadLocal(LocalStorageKey key, void* value) {
   pthread_key_t pthread_key = LocalKeyToPthreadKey(key);
   int result = pthread_setspecific(pthread_key, value);
   ASSERT_EQ(0, result);
   USE(result);
 }
 
 
 } }  // namespace v8::internal