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// Copyright 2020 the V8 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.
#include "src/heap/local-heap.h"
#include "src/handles/local-handles.h"
#include "src/heap/heap.h"
#include "src/heap/safepoint.h"
namespace v8 {
namespace internal {
LocalHeap::LocalHeap(Heap* heap)
: heap_(heap),
state_(ThreadState::Running),
safepoint_requested_(false),
prev_(nullptr),
next_(nullptr),
handles_(new LocalHandles) {
heap_->safepoint()->AddLocalHeap(this);
}
LocalHeap::~LocalHeap() {
// Park thread since removing the local heap could block.
EnsureParkedBeforeDestruction();
heap_->safepoint()->RemoveLocalHeap(this);
}
void LocalHeap::Park() {
base::MutexGuard guard(&state_mutex_);
CHECK(state_ == ThreadState::Running);
state_ = ThreadState::Parked;
state_change_.NotifyAll();
}
void LocalHeap::Unpark() {
base::MutexGuard guard(&state_mutex_);
CHECK(state_ == ThreadState::Parked);
state_ = ThreadState::Running;
}
void LocalHeap::EnsureParkedBeforeDestruction() {
base::MutexGuard guard(&state_mutex_);
state_ = ThreadState::Parked;
state_change_.NotifyAll();
}
void LocalHeap::RequestSafepoint() {
safepoint_requested_.store(true, std::memory_order_relaxed);
}
bool LocalHeap::IsSafepointRequested() {
return safepoint_requested_.load(std::memory_order_relaxed);
}
void LocalHeap::Safepoint() {
if (IsSafepointRequested()) {
ClearSafepointRequested();
EnterSafepoint();
}
}
void LocalHeap::ClearSafepointRequested() {
safepoint_requested_.store(false, std::memory_order_relaxed);
}
void LocalHeap::EnterSafepoint() { heap_->safepoint()->EnterFromThread(this); }
} // namespace internal
} // namespace v8
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