| /* |
| * Copyright (C) 2009 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include <stdint.h> |
| #include <errno.h> |
| #include <sys/types.h> |
| |
| #include <utils/threads.h> |
| #include <utils/Timers.h> |
| #include <utils/Log.h> |
| #include <binder/IPCThreadState.h> |
| |
| #include "MessageQueue.h" |
| |
| namespace android { |
| |
| // --------------------------------------------------------------------------- |
| |
| MessageBase::MessageBase() |
| : MessageHandler() { |
| } |
| |
| MessageBase::~MessageBase() { |
| } |
| |
| void MessageBase::handleMessage(const Message&) { |
| this->handler(); |
| barrier.open(); |
| }; |
| |
| // --------------------------------------------------------------------------- |
| |
| MessageQueue::MessageQueue() |
| : mLooper(new Looper(true)), mWorkPending(0) |
| { |
| } |
| |
| MessageQueue::~MessageQueue() { |
| } |
| |
| void MessageQueue::waitMessage() { |
| do { |
| IPCThreadState::self()->flushCommands(); |
| |
| int32_t ret = mLooper->pollOnce(-1); |
| switch (ret) { |
| case ALOOPER_POLL_WAKE: |
| case ALOOPER_POLL_CALLBACK: |
| // callback and/or wake |
| if (android_atomic_and(0, &mWorkPending)) { |
| return; |
| } |
| continue; |
| |
| case ALOOPER_POLL_TIMEOUT: |
| // timeout (should not happen) |
| continue; |
| |
| case ALOOPER_POLL_ERROR: |
| LOGE("ALOOPER_POLL_ERROR"); |
| continue; |
| |
| default: |
| // should not happen |
| LOGE("Looper::pollOnce() returned unknown status %d", ret); |
| continue; |
| } |
| } while (true); |
| } |
| |
| status_t MessageQueue::postMessage( |
| const sp<MessageBase>& messageHandler, nsecs_t relTime) |
| { |
| const Message dummyMessage; |
| if (relTime > 0) { |
| mLooper->sendMessageDelayed(relTime, messageHandler, dummyMessage); |
| } else { |
| mLooper->sendMessage(messageHandler, dummyMessage); |
| } |
| return NO_ERROR; |
| } |
| |
| status_t MessageQueue::invalidate() { |
| if (android_atomic_or(1, &mWorkPending) == 0) { |
| mLooper->wake(); |
| } |
| return NO_ERROR; |
| } |
| |
| // --------------------------------------------------------------------------- |
| |
| }; // namespace android |