Add a class for extracting system-specific information, like the number of processors.

Review URL: http://codereview.chromium.org/3084

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@2302 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 28 insertions, 0 deletions

diff --git a/base/sys_info_posix.cc b/base/sys_info_posix.cc
new file mode 100644
index 0000000..093e607
--- /dev/null
+++ b/base/sys_info_posix.cc
@@ -0,0 +1,28 @@
+// Copyright (c) 2008 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/sys_info.h"
+
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "base/basictypes.h"
+#include "base/logging.h"
+
+namespace base {
+
+int SysInfo::NumberOfProcessors() {
+  // It seems that sysconf returns the number of "logical" processors on both
+  // mac and linux.  So we get the number of "online logical" processors.
+  long res = sysconf(_SC_NPROCESSORS_ONLN);
+  if (res == -1) {
+    NOTREACHED();
+    return 1;
+  }
+
+  return static_cast<int>(res);
+}
+
+}  // namespace base