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Issue 17106004: Add discardable memory emulation for non-android/mac platforms (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: address review feedback Created 7 years, 2 months ago
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1 // Copyright 2013 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 "base/memory/discardable_memory.h"
6
7 #include "base/memory/discardable_memory_provider.h"
8
9 using base::internal::DiscardableMemoryProvider;
10
11 namespace base {
12
13 // static
14 bool DiscardableMemory::SupportedNatively() {
15 return false;
16 }
17
18 DiscardableMemory::~DiscardableMemory() {
19 if (is_locked_)
20 Unlock();
21 DiscardableMemoryProvider::GetInstance()->Unregister(this);
22 }
23
24 bool DiscardableMemory::InitializeAndLock(size_t size) {
25 DCHECK(!acquired_memory_);
26
27 DiscardableMemoryProvider::GetInstance()->Register(this, size);
28 size_ = size;
29 return Lock() == DISCARDABLE_MEMORY_PURGED;
30 }
31
32 LockDiscardableMemoryStatus DiscardableMemory::Lock() {
33 DCHECK(!is_locked_);
34
35 bool purged = false;
36 // This can fail if we have not been registered. That is, it's an error to
37 // |Lock| before calling |InitializeAndLock|.
38 acquired_memory_ = DiscardableMemoryProvider::GetInstance()->Acquire(
39 this, &purged);
40 if (!acquired_memory_)
41 return DISCARDABLE_MEMORY_FAILED;
42
43 memory_ = acquired_memory_.get();
44 is_locked_ = true;
45 return purged ? DISCARDABLE_MEMORY_PURGED : DISCARDABLE_MEMORY_SUCCESS;
46 }
47
48 void DiscardableMemory::Unlock() {
49 DCHECK(is_locked_);
50 DiscardableMemoryProvider::GetInstance()->Release(
51 this, acquired_memory_.Pass());
52 is_locked_ = false;
53 }
54
55 // static
56 bool DiscardableMemory::PurgeForTestingSupported() {
57 return true;
58 }
59
60 // static
61 void DiscardableMemory::PurgeForTesting() {
62 DiscardableMemoryProvider::GetInstance()->PurgeAll();
63 }
64
65 } // namespace base
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