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| author | joth@chromium.org <joth@chromium.org@0039d316-1c4b-4281-b951-d872f2087c98> | 2011-11-07 11:11:51 +0000 |
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| committer | joth@chromium.org <joth@chromium.org@0039d316-1c4b-4281-b951-d872f2087c98> | 2011-11-07 11:11:51 +0000 |
| commit | ee5272d8cc1cd65bb185fdbdd8a00836fa3c9a4d (patch) | |
| tree | 22a88ed7e88674949a53b0637a144ac3f5cdac1e /base/memory/singleton.cc | |
| parent | 628a22ae07ae79d1184ca081b36b226863e536ca (diff) | |
| download | chromium_src-ee5272d8cc1cd65bb185fdbdd8a00836fa3c9a4d.zip chromium_src-ee5272d8cc1cd65bb185fdbdd8a00836fa3c9a4d.tar.gz chromium_src-ee5272d8cc1cd65bb185fdbdd8a00836fa3c9a4d.tar.bz2 | |
Thin out the Singeton template code
- hides platform_thread.h from users of singelton
- knock 4KB off the release binary size
BUG=None
TEST=Nothing breaks
Review URL: http://codereview.chromium.org/8475007
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@108853 0039d316-1c4b-4281-b951-d872f2087c98
Diffstat (limited to 'base/memory/singleton.cc')
| -rw-r--r-- | base/memory/singleton.cc | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/base/memory/singleton.cc b/base/memory/singleton.cc new file mode 100644 index 0000000..ee5e58d --- /dev/null +++ b/base/memory/singleton.cc @@ -0,0 +1,31 @@ +// Copyright (c) 2011 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/memory/singleton.h" +#include "base/threading/platform_thread.h" + +namespace base { +namespace internal { + +subtle::AtomicWord WaitForInstance(subtle::AtomicWord* instance) { + // Handle the race. Another thread beat us and either: + // - Has the object in BeingCreated state + // - Already has the object created... + // We know value != NULL. It could be kBeingCreatedMarker, or a valid ptr. + // Unless your constructor can be very time consuming, it is very unlikely + // to hit this race. When it does, we just spin and yield the thread until + // the object has been created. + subtle::AtomicWord value; + while (true) { + value = subtle::NoBarrier_Load(instance); + if (value != kBeingCreatedMarker) + break; + PlatformThread::YieldCurrentThread(); + } + return value; +} + +} // namespace internal +} // namespace base + |