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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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