Daniel Andersson
a410c0f993
BUG= R=iposva@google.com Review URL: https://codereview.chromium.org//1168483003.
113 lines
2.3 KiB
C++
113 lines
2.3 KiB
C++
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#include "vm/store_buffer.h"
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#include "platform/assert.h"
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#include "vm/lockers.h"
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#include "vm/runtime_entry.h"
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namespace dart {
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DEFINE_LEAF_RUNTIME_ENTRY(void, StoreBufferBlockProcess, 1, Thread* thread) {
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thread->StoreBufferBlockProcess(true);
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}
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END_LEAF_RUNTIME_ENTRY
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StoreBuffer::StoreBuffer() : mutex_(new Mutex()) {
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}
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StoreBuffer::~StoreBuffer() {
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Reset();
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delete mutex_;
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}
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void StoreBuffer::Reset() {
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MutexLocker ml(mutex_);
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// TODO(koda): Reuse and share empty blocks between isolates.
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while (!full_.IsEmpty()) {
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delete full_.Pop();
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}
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while (!partial_.IsEmpty()) {
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delete partial_.Pop();
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}
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}
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StoreBufferBlock* StoreBuffer::Blocks() {
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MutexLocker ml(mutex_);
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while (!partial_.IsEmpty()) {
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full_.Push(partial_.Pop());
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}
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return full_.PopAll();
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}
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void StoreBuffer::PushBlock(StoreBufferBlock* block, bool check_threshold) {
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MutexLocker ml(mutex_);
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List* list = block->IsFull() ? &full_ : &partial_;
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list->Push(block);
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if (check_threshold) {
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CheckThreshold();
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}
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}
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StoreBufferBlock* StoreBuffer::PopBlock() {
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MutexLocker ml(mutex_);
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return (!partial_.IsEmpty()) ? partial_.Pop() : PopEmptyBlock();
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}
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StoreBufferBlock* StoreBuffer::PopEmptyBlock() {
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// TODO(koda): Reuse and share empty blocks between isolates.
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return new StoreBufferBlock();
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}
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StoreBuffer::List::~List() {
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while (!IsEmpty()) {
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delete Pop();
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}
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}
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StoreBufferBlock* StoreBuffer::List::Pop() {
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StoreBufferBlock* result = head_;
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head_ = head_->next_;
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--length_;
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result->next_ = NULL;
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return result;
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}
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StoreBufferBlock* StoreBuffer::List::PopAll() {
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StoreBufferBlock* result = head_;
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head_ = NULL;
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length_ = 0;
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return result;
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}
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void StoreBuffer::List::Push(StoreBufferBlock* block) {
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block->next_ = head_;
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head_ = block;
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++length_;
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}
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void StoreBuffer::CheckThreshold() {
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// Schedule an interrupt if we have run over the max number of
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// StoreBufferBlocks.
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// TODO(koda): Pass threshold and callback in constructor. Cap total?
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if (full_.length() > 100) {
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Isolate::Current()->ScheduleInterrupts(Isolate::kStoreBufferInterrupt);
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}
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}
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} // namespace dart
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