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// Copyright (c) 2012 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 "rlz/lib/recursive_lock.h"
#include "base/logging.h"
namespace rlz_lib {
RecursiveLock::RecursiveLock()
: owner_(),
recursion_() {
}
RecursiveLock::~RecursiveLock() {
}
void RecursiveLock::Acquire() {
base::subtle::Atomic32 me = base::PlatformThread::CurrentId();
if (me != base::subtle::NoBarrier_Load(&owner_)) {
lock_.Acquire();
DCHECK(!recursion_);
DCHECK(!owner_);
base::subtle::NoBarrier_Store(&owner_, me);
}
++recursion_;
}
void RecursiveLock::Release() {
DCHECK_EQ(base::subtle::NoBarrier_Load(&owner_),
base::PlatformThread::CurrentId());
DCHECK_GT(recursion_, 0);
if (!--recursion_) {
base::subtle::NoBarrier_Store(&owner_, 0);
lock_.Release();
}
}
} // namespace rlz_lib
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