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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #include "rlz/lib/recursive_lock.h" |
| 6 |
| 7 #include "base/logging.h" |
| 8 |
| 9 namespace rlz_lib { |
| 10 |
| 11 RecursiveLock::RecursiveLock() |
| 12 : owner_(), |
| 13 recursion_() { |
| 14 } |
| 15 |
| 16 RecursiveLock::~RecursiveLock() { |
| 17 } |
| 18 |
| 19 void RecursiveLock::Acquire() { |
| 20 base::subtle::Atomic32 me = base::PlatformThread::CurrentId(); |
| 21 if (me != base::subtle::NoBarrier_Load(&owner_)) { |
| 22 lock_.Acquire(); |
| 23 DCHECK(!recursion_); |
| 24 DCHECK(!owner_); |
| 25 base::subtle::NoBarrier_Store(&owner_, me); |
| 26 } |
| 27 ++recursion_; |
| 28 } |
| 29 |
| 30 void RecursiveLock::Release() { |
| 31 DCHECK_EQ(base::subtle::NoBarrier_Load(&owner_), |
| 32 base::PlatformThread::CurrentId()); |
| 33 DCHECK_GT(recursion_, 0); |
| 34 if (!--recursion_) { |
| 35 base::subtle::NoBarrier_Store(&owner_, 0); |
| 36 lock_.Release(); |
| 37 } |
| 38 } |
| 39 |
| 40 } // namespace rlz_lib |
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