162 lines
4.5 KiB
C++
162 lines
4.5 KiB
C++
/*
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* Copyright (C) 2009 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdint.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <utils/threads.h>
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#include <utils/Timers.h>
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#include <utils/Log.h>
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#include <utils/IPCThreadState.h>
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#include "MessageQueue.h"
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namespace android {
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// ---------------------------------------------------------------------------
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MessageQueue::MessageQueue()
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{
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mInvalidateMessage = new MessageBase(INVALIDATE);
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}
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MessageQueue::~MessageQueue()
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{
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}
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MessageList::NODE_PTR MessageQueue::waitMessage(nsecs_t timeout)
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{
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MessageList::NODE_PTR result;
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bool again;
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do {
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const nsecs_t timeoutTime = systemTime() + timeout;
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while (true) {
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Mutex::Autolock _l(mLock);
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nsecs_t now = systemTime();
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nsecs_t nextEventTime = -1;
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// invalidate messages are always handled first
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if (mInvalidate) {
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mInvalidate = false;
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mInvalidateMessage->when = now;
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result = mInvalidateMessage;
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break;
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}
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result = mMessages.head();
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if (result != 0) {
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if (result->when <= now) {
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// there is a message to deliver
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mMessages.remove(result);
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result->detach();
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break;
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}
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if (timeout>=0 && timeoutTime < now) {
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// we timed-out, return a NULL message
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result = 0;
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break;
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}
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nextEventTime = result->when;
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result = 0;
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}
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if (timeout >= 0 && nextEventTime > 0) {
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if (nextEventTime > timeoutTime) {
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nextEventTime = timeoutTime;
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}
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}
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if (nextEventTime >= 0) {
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//LOGD("nextEventTime = %lld ms", nextEventTime);
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if (nextEventTime > 0) {
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// we're about to wait, flush the binder command buffer
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IPCThreadState::self()->flushCommands();
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mCondition.wait(mLock, nextEventTime);
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}
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} else {
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//LOGD("going to wait");
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// we're about to wait, flush the binder command buffer
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IPCThreadState::self()->flushCommands();
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mCondition.wait(mLock);
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}
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}
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// here we're not holding the lock anymore
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if (result == 0)
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break;
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again = result->handler();
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if (again) {
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// the message has been processed. release our reference to it
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// without holding the lock.
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result = 0;
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}
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} while (again);
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return result;
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}
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status_t MessageQueue::postMessage(
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const MessageList::NODE_PTR& message, nsecs_t relTime, uint32_t flags)
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{
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return queueMessage(message, relTime, flags);
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}
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status_t MessageQueue::invalidate() {
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Mutex::Autolock _l(mLock);
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mInvalidate = true;
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mCondition.signal();
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return NO_ERROR;
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}
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status_t MessageQueue::queueMessage(
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const MessageList::NODE_PTR& message, nsecs_t relTime, uint32_t flags)
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{
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Mutex::Autolock _l(mLock);
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message->when = systemTime() + relTime;
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mMessages.insert(message);
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//LOGD("MessageQueue::queueMessage time = %lld ms", message->when);
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//dumpLocked(message);
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mCondition.signal();
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return NO_ERROR;
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}
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void MessageQueue::dump(const MessageList::NODE_PTR& message)
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{
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Mutex::Autolock _l(mLock);
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dumpLocked(message);
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}
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void MessageQueue::dumpLocked(const MessageList::NODE_PTR& message)
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{
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MessageList::NODE_PTR l(mMessages.head());
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int c = 0;
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while (l != 0) {
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const char tick = (l == message) ? '>' : ' ';
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LOGD("%c %d: msg{.what=%08x, when=%lld}", tick, c, l->what, l->when);
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l = l->getNext();
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c++;
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}
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}
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// ---------------------------------------------------------------------------
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}; // namespace android
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