turnidge@google.com
9ba5441c54
Review URL: http://codereview.chromium.org//8392044 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@781 260f80e4-7a28-3924-810f-c04153c831b5
101 lines
2.3 KiB
C++
101 lines
2.3 KiB
C++
// Copyright (c) 2011, 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/message_queue.h"
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namespace dart {
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MessageQueue::~MessageQueue() {
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// Ensure that all pending messages have been released.
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ASSERT(head_ == NULL);
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}
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void MessageQueue::Enqueue(PortMessage* msg) {
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// TODO(turnidge): Can't use MonitorLocker here because
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// MonitorLocker is a StackResource, which requires a current
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// isolate. Should MonitorLocker really be a StackResource?
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monitor_.Enter();
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// Make sure messages are not reused.
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ASSERT(msg->next_ == NULL);
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if (head_ == NULL) {
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// Only element in the queue.
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head_ = msg;
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tail_ = msg;
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// We only need to notify if the queue was empty.
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monitor_.Notify();
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} else {
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ASSERT(tail_ != NULL);
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// Append at the tail.
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tail_->next_ = msg;
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tail_ = msg;
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}
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monitor_.Exit();
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}
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PortMessage* MessageQueue::Dequeue(int64_t millis) {
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ASSERT(millis >= 0);
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MonitorLocker ml(&monitor_);
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PortMessage* result = head_;
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if (result == NULL) {
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ml.Wait(millis);
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result = head_;
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}
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if (result != NULL) {
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head_ = result->next_;
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// The following update to tail_ is not strictly needed.
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if (head_ == NULL) {
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tail_ = NULL;
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}
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#if DEBUG
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result->next_ = result; // Make sure to trigger ASSERT in Enqueue.
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#endif // DEBUG
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}
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return result;
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}
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void MessageQueue::Flush(Dart_Port port) {
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MonitorLocker ml(&monitor_);
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PortMessage* cur = head_;
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PortMessage* prev = NULL;
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while (cur != NULL) {
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PortMessage* next = cur->next_;
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// If the message matches, then remove it from the queue and delete it.
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if (cur->dest_port() == port) {
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if (prev != NULL) {
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prev->next_ = next;
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} else {
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head_ = next;
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}
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delete cur;
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} else {
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// Move prev forward.
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prev = cur;
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}
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// Advance to the next message in the queue.
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cur = next;
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}
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tail_ = prev;
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}
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void MessageQueue::FlushAll() {
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MonitorLocker ml(&monitor_);
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PortMessage* cur = head_;
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head_ = NULL;
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tail_ = NULL;
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while (cur != NULL) {
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PortMessage* next = cur->next_;
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delete cur;
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cur = next;
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}
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}
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} // namespace dart
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