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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 01:47:29 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 01:47:29 +0000 |
commit | 0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d (patch) | |
tree | a31f07c9bcca9d56ce61e9a1ffd30ef350d513aa /third_party/libwebrtc/rtc_base/weak_ptr.cc | |
parent | Initial commit. (diff) | |
download | firefox-esr-0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d.tar.xz firefox-esr-0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d.zip |
Adding upstream version 115.8.0esr.upstream/115.8.0esr
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'third_party/libwebrtc/rtc_base/weak_ptr.cc')
-rw-r--r-- | third_party/libwebrtc/rtc_base/weak_ptr.cc | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/third_party/libwebrtc/rtc_base/weak_ptr.cc b/third_party/libwebrtc/rtc_base/weak_ptr.cc new file mode 100644 index 0000000000..09807e1705 --- /dev/null +++ b/third_party/libwebrtc/rtc_base/weak_ptr.cc @@ -0,0 +1,82 @@ +/* + * Copyright 2016 The WebRTC Project Authors. All rights reserved. + * + * Use of this source code is governed by a BSD-style license + * that can be found in the LICENSE file in the root of the source + * tree. An additional intellectual property rights grant can be found + * in the file PATENTS. All contributing project authors may + * be found in the AUTHORS file in the root of the source tree. + */ + +#include "rtc_base/weak_ptr.h" + +// The implementation is borrowed from chromium except that it does not +// implement SupportsWeakPtr. + +namespace rtc { +namespace internal { + +WeakReference::Flag::Flag() : is_valid_(true) { + // Flags only become bound when checked for validity, or invalidated, + // so that we can check that later validity/invalidation operations on + // the same Flag take place on the same sequence. + checker_.Detach(); +} + +void WeakReference::Flag::Invalidate() { + RTC_DCHECK(checker_.IsCurrent()) + << "WeakPtrs must be invalidated on the same sequence."; + is_valid_ = false; +} + +bool WeakReference::Flag::IsValid() const { + RTC_DCHECK(checker_.IsCurrent()) + << "WeakPtrs must be checked on the same sequence."; + return is_valid_; +} + +WeakReference::Flag::~Flag() {} + +WeakReference::WeakReference() {} + +WeakReference::WeakReference(const Flag* flag) : flag_(flag) {} + +WeakReference::~WeakReference() {} + +WeakReference::WeakReference(WeakReference&& other) = default; + +WeakReference::WeakReference(const WeakReference& other) = default; + +bool WeakReference::is_valid() const { + return flag_.get() && flag_->IsValid(); +} + +WeakReferenceOwner::WeakReferenceOwner() {} + +WeakReferenceOwner::~WeakReferenceOwner() { + Invalidate(); +} + +WeakReference WeakReferenceOwner::GetRef() const { + // If we hold the last reference to the Flag then create a new one. + if (!HasRefs()) + flag_ = new RefCountedObject<WeakReference::Flag>(); + + return WeakReference(flag_.get()); +} + +void WeakReferenceOwner::Invalidate() { + if (flag_.get()) { + flag_->Invalidate(); + flag_ = nullptr; + } +} + +WeakPtrBase::WeakPtrBase() {} + +WeakPtrBase::~WeakPtrBase() {} + +WeakPtrBase::WeakPtrBase(const WeakReference& ref) : ref_(ref) {} + +} // namespace internal +} // namespace rtc |