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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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