Determine number of available cores on all platforms.

BUG=

Review URL: https://codereview.chromium.org/12089107

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@13676 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/platform-cygwin.cc

@@ -177,6 +177,11 @@ void OS::Sleep(int milliseconds) {
 }
 
 
+int OS::NumberOfCores() {
+  return sysconf(_SC_NPROCESSORS_ONLN);
+}
+
+
 void OS::Abort() {
   // Redirect to std abort to signal abnormal program termination.
   abort();

src/platform-freebsd.cc

@@ -181,6 +181,11 @@ void OS::Sleep(int milliseconds) {
 }
 
 
+int OS::NumberOfCores() {
+  return sysconf(_SC_NPROCESSORS_ONLN);
+}
+
+
 void OS::Abort() {
   // Redirect to std abort to signal abnormal program termination.
   abort();

src/platform-linux.cc

@@ -403,6 +403,11 @@ void OS::Sleep(int milliseconds) {
 }
 
 
+int OS::NumberOfCores() {
+  return sysconf(_SC_NPROCESSORS_ONLN);
+}
+
+
 void OS::Abort() {
   // Redirect to std abort to signal abnormal program termination.
   if (FLAG_break_on_abort) {

src/platform-macos.cc

@@ -171,6 +171,11 @@ void OS::Sleep(int milliseconds) {
 }
 
 
+int OS::NumberOfCores() {
+  return sysconf(_SC_NPROCESSORS_ONLN);
+}
+
+
 void OS::Abort() {
   // Redirect to std abort to signal abnormal program termination
   abort();

src/platform-nullos.cc

@@ -266,6 +266,12 @@ void OS::Sleep(int milliseconds) {
 }
 
 
+int OS::NumberOfCores() {
+  UNIMPLEMENTED();
+  return 0;
+}
+
+
 void OS::Abort() {
   // Minimalistic implementation for bootstrapping.
   abort();

src/platform-openbsd.cc

@@ -204,6 +204,11 @@ void OS::Sleep(int milliseconds) {
 }
 
 
+int OS::NumberOfCores() {
+  return sysconf(_SC_NPROCESSORS_ONLN);
+}
+
+
 void OS::Abort() {
   // Redirect to std abort to signal abnormal program termination.
   abort();

src/platform-solaris.cc

@@ -191,6 +191,11 @@ void OS::Sleep(int milliseconds) {
 }
 
 
+int OS::NumberOfCores() {
+  return sysconf(_SC_NPROCESSORS_ONLN);
+}
+
+
 void OS::Abort() {
   // Redirect to std abort to signal abnormal program termination.
   abort();

src/platform-win32.cc

@@ -978,6 +978,13 @@ void OS::Sleep(int milliseconds) {
 }
 
 
+int OS::NumberOfCores() {
+  SYSTEM_INFO info;
+  GetSystemInfo(&info);
+  return info.dwNumberOfProcessors;
+}
+
+
 void OS::Abort() {
   if (IsDebuggerPresent() || FLAG_break_on_abort) {
     DebugBreak();

src/platform.h

@@ -239,6 +239,8 @@ class OS {
   // Sleep for a number of milliseconds.
   static void Sleep(const int milliseconds);
 
+  static int NumberOfCores();
+
   // Abort the current process.
   static void Abort();
 

test/cctest/cctest.gyp

@@ -82,6 +82,7 @@
         'test-mark-compact.cc',
         'test-object-observe.cc',
         'test-parsing.cc',
+        'test-platform.cc',
         'test-platform-tls.cc',
         'test-profile-generator.cc',
         'test-random.cc',

test/cctest/test-platform.cc

+// Copyright 2013 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
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include <stdlib.h>
+
+#include "cctest.h"
+#include "platform.h"
+
+using namespace ::v8::internal;
+
+TEST(NumberOfCores) {
+  CHECK_GT(OS::NumberOfCores(), 0);
+}