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/*
* Copyright 2010, The Android Open Source Project
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#define LOG_TAG "MessageThread"
#include "config.h"
#include <sys/time.h>
#include <time.h>
#include "MessageThread.h"
#include "ScriptController.h"
#include <utils/Log.h>
namespace android {
static bool compareMessages(const Message& msg1,
const Message& msg2,
bool memberIsNull) {
return (msg1.object() == msg2.object() &&
(memberIsNull || msg1.member() == msg2.member()));
}
bool MessageQueue::hasMessages(const Message& message) {
AutoMutex lock(m_mutex);
static const Message::GenericMemberFunction nullMember = NULL;
const bool memberIsNull = message.member() == nullMember;
for (list<Message*>::iterator it = m_messages.begin();
it != m_messages.end(); ++it) {
Message* m = *it;
if (compareMessages(message, *m, memberIsNull))
return true;
}
return false;
}
void MessageQueue::remove(const Message& message) {
AutoMutex lock(m_mutex);
static const Message::GenericMemberFunction nullMember = NULL;
const bool memberIsNull = message.member() == nullMember;
for (list<Message*>::iterator it = m_messages.begin();
it != m_messages.end(); ++it) {
Message* m = *it;
if (compareMessages(message, *m, memberIsNull)) {
it = m_messages.erase(it);
delete m;
}
}
}
void MessageQueue::post(Message* message) {
AutoMutex lock(m_mutex);
double when = message->m_when;
LOG_ASSERT(when > 0, "Message time may not be 0");
list<Message*>::iterator it;
for (it = m_messages.begin(); it != m_messages.end(); ++it) {
Message* m = *it;
if (when < m->m_when) {
break;
}
}
m_messages.insert(it, message);
m_condition.signal();
}
void MessageQueue::postAtFront(Message* message) {
AutoMutex lock(m_mutex);
message->m_when = 0;
m_messages.push_front(message);
}
Message* MessageQueue::next() {
AutoMutex lock(m_mutex);
while (true) {
if (m_messages.empty()) {
// No messages, wait until another arrives
m_condition.wait(m_mutex);
}
Message* next = m_messages.front();
double now = WTF::currentTimeMS();
double diff = next->m_when - now;
if (diff > 0) {
// Not time for this message yet, wait the difference in nanos
m_condition.waitRelative(m_mutex,
static_cast<nsecs_t>(diff * 1000000) /* nanos */);
} else {
// Time for this message to run.
m_messages.pop_front();
return next;
}
}
}
bool MessageThread::threadLoop() {
WebCore::ScriptController::initializeThreading();
while (true) {
Message* message = m_queue.next();
if (message != NULL) {
message->run();
}
}
return false;
}
// Global thread object obtained by messageThread().
static sp<MessageThread> gMessageThread;
MessageThread* messageThread() {
if (gMessageThread == NULL) {
gMessageThread = new MessageThread();
gMessageThread->run("WebCoreThread");
}
return gMessageThread.get();
}
} // namespace android
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