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/*
* 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 <utils/IPCThreadState.h>
#include "MessageQueue.h"
namespace android {
// ---------------------------------------------------------------------------
MessageQueue::MessageQueue()
{
mInvalidateMessage = new MessageBase(INVALIDATE);
}
MessageQueue::~MessageQueue()
{
}
MessageList::NODE_PTR MessageQueue::waitMessage(nsecs_t timeout)
{
MessageList::NODE_PTR result;
bool again;
do {
const nsecs_t timeoutTime = systemTime() + timeout;
while (true) {
Mutex::Autolock _l(mLock);
nsecs_t now = systemTime();
nsecs_t nextEventTime = -1;
// invalidate messages are always handled first
if (mInvalidate) {
mInvalidate = false;
mInvalidateMessage->when = now;
result = mInvalidateMessage;
break;
}
result = mMessages.head();
if (result != 0) {
if (result->when <= now) {
// there is a message to deliver
mMessages.remove(result);
result->detach();
break;
}
if (timeout>=0 && timeoutTime < now) {
// we timed-out, return a NULL message
result = 0;
break;
}
nextEventTime = result->when;
result = 0;
}
if (timeout >= 0 && nextEventTime > 0) {
if (nextEventTime > timeoutTime) {
nextEventTime = timeoutTime;
}
}
if (nextEventTime >= 0) {
//LOGD("nextEventTime = %lld ms", nextEventTime);
if (nextEventTime > 0) {
// we're about to wait, flush the binder command buffer
IPCThreadState::self()->flushCommands();
mCondition.wait(mLock, nextEventTime);
}
} else {
//LOGD("going to wait");
// we're about to wait, flush the binder command buffer
IPCThreadState::self()->flushCommands();
mCondition.wait(mLock);
}
}
// here we're not holding the lock anymore
if (result == 0)
break;
again = result->handler();
if (again) {
// the message has been processed. release our reference to it
// without holding the lock.
result = 0;
}
} while (again);
return result;
}
status_t MessageQueue::postMessage(
const MessageList::NODE_PTR& message, nsecs_t relTime, uint32_t flags)
{
return queueMessage(message, relTime, flags);
}
status_t MessageQueue::invalidate() {
Mutex::Autolock _l(mLock);
mInvalidate = true;
mCondition.signal();
return NO_ERROR;
}
status_t MessageQueue::queueMessage(
const MessageList::NODE_PTR& message, nsecs_t relTime, uint32_t flags)
{
Mutex::Autolock _l(mLock);
message->when = systemTime() + relTime;
mMessages.insert(message);
//LOGD("MessageQueue::queueMessage time = %lld ms", message->when);
//dumpLocked(message);
mCondition.signal();
return NO_ERROR;
}
void MessageQueue::dump(const MessageList::NODE_PTR& message)
{
Mutex::Autolock _l(mLock);
dumpLocked(message);
}
void MessageQueue::dumpLocked(const MessageList::NODE_PTR& message)
{
MessageList::NODE_PTR l(mMessages.head());
int c = 0;
while (l != 0) {
const char tick = (l == message) ? '>' : ' ';
LOGD("%c %d: msg{.what=%08x, when=%lld}", tick, c, l->what, l->when);
l = l->getNext();
c++;
}
}
// ---------------------------------------------------------------------------
}; // namespace android
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