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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/task/sequence_manager/associated_thread_id.h"
#include "base/check.h"
#include "base/dcheck_is_on.h"
namespace base::sequence_manager::internal {
AssociatedThreadId::AssociatedThreadId() = default;
AssociatedThreadId::~AssociatedThreadId() = default;
void AssociatedThreadId::BindToCurrentThread() {
#if DCHECK_IS_ON()
const auto prev_thread_ref =
bound_thread_ref_.load(std::memory_order_relaxed);
DCHECK(prev_thread_ref.is_null() ||
prev_thread_ref == PlatformThread::CurrentRef());
#endif
sequence_token_ = base::internal::SequenceToken::GetForCurrentThread();
bound_thread_ref_.store(PlatformThread::CurrentRef(),
std::memory_order_release);
// Rebind the thread and sequence checkers to the current thread/sequence.
DETACH_FROM_THREAD(thread_checker);
DCHECK_CALLED_ON_VALID_THREAD(thread_checker);
DETACH_FROM_SEQUENCE(sequence_checker);
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker);
}
bool AssociatedThreadId::IsBoundToCurrentThread() const {
const PlatformThreadRef bound_thread_ref =
bound_thread_ref_.load(std::memory_order_relaxed);
const PlatformThreadRef in_sequence_thread_ref =
in_sequence_thread_ref_.load(std::memory_order_relaxed);
const PlatformThreadRef current_thread_ref = PlatformThread::CurrentRef();
if (!in_sequence_thread_ref.is_null()) {
// The main thread cannot run when another thread is running "in sequence"
// with it.
CHECK_NE(current_thread_ref, bound_thread_ref);
}
return bound_thread_ref == current_thread_ref;
}
void AssociatedThreadId::AssertInSequenceWithCurrentThread() const {
const PlatformThreadRef in_sequence_thread_ref =
in_sequence_thread_ref_.load(std::memory_order_relaxed);
if (!in_sequence_thread_ref.is_null()) {
CHECK_EQ(in_sequence_thread_ref, PlatformThread::CurrentRef());
return;
}
#if DCHECK_IS_ON()
const PlatformThreadRef bound_thread_ref =
bound_thread_ref_.load(std::memory_order_relaxed);
if (!bound_thread_ref.is_null()) {
CHECK_EQ(bound_thread_ref, PlatformThread::CurrentRef());
return;
}
DCHECK_CALLED_ON_VALID_THREAD(thread_checker);
#endif // DCHECK_IS_ON()
}
void AssociatedThreadId::StartInSequenceWithCurrentThread() {
PlatformThreadRef expected = PlatformThreadRef();
bool succeeded = in_sequence_thread_ref_.compare_exchange_strong(
expected, PlatformThread::CurrentRef(), std::memory_order_relaxed);
CHECK(succeeded);
}
void AssociatedThreadId::StopInSequenceWithCurrentThread() {
PlatformThreadRef expected = PlatformThread::CurrentRef();
bool succeeded = in_sequence_thread_ref_.compare_exchange_strong(
expected, PlatformThreadRef(), std::memory_order_relaxed);
CHECK(succeeded);
}
} // namespace base::sequence_manager::internal
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