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/*
* Copyright (C) 2014 Emweb bvba, Heverlee, Belgium.
*
* See the LICENSE file for terms of use.
*/
#include "SingleThreadedApplication.h"
SingleThreadedApplication::
SingleThreadedApplication(const Wt::WEnvironment& env)
: Wt::WApplication(env),
finalized_(false),
exception_(false),
event_(0),
done_(false),
newEvent_(false)
{ }
void SingleThreadedApplication::initialize()
{
log("debug") << "STA" << ": initialize()";
Wt::WApplication::initialize();
create();
}
void SingleThreadedApplication::finalize()
{
log("debug") << "STA" << ": finalize()";
Wt::WApplication::finalize();
destroy();
finalized_ = true;
}
void SingleThreadedApplication::notify(const Wt::WEvent& event)
{
if (appThread_.get_id() == boost::thread::id()) { // not-a-thread
done_ = false;
log("debug") << "STA" << ": starting thread";
appThread_ = boost::thread(boost::bind(&SingleThreadedApplication::run,
this));
waitDone();
}
if (boost::this_thread::get_id() == appThread_.get_id()) {
/* This could be from within a recursive event loop */
log("debug") << "STA" << ": notify() called within app thread";
threadNotify(event);
return;
}
if (event.eventType() == Wt::ResourceEvent) {
/*
* We do not relay resource events since these will not unlock
* a recursive event loop and thus we cannot communicate with the
* private thread when it's blocked in a recursive event loop
*/
log("debug") << "STA" << ": notify() for resource, handling in thread pool.";
threadNotify(event);
return;
}
event_ = &event;
done_ = false;
{
log("debug") << "STA" << ": notifying thread";
boost::mutex::scoped_lock lock(newEventMutex_);
newEvent_ = true;
newEventCondition_.notify_one();
}
waitDone();
if (exception_) {
exception_ = false;
throw std::runtime_error("STA: rethrowing exception");
}
if (finalized_) {
log("debug") << "STA" << ": joining thread";
appThread_.join();
appThread_ = boost::thread();
}
}
void SingleThreadedApplication::waitDone()
{
log("debug") << "STA" << ": waiting for event done";
boost::mutex::scoped_lock lock(doneMutex_);
while (!done_)
doneCondition_.wait(lock);
}
void SingleThreadedApplication::run()
{
signalDone();
boost::mutex::scoped_lock lock(newEventMutex_);
eventLock_ = &lock;
for (;;) {
if (!newEvent_) {
log("debug") << "STA" << ": [thread] waiting for event";
newEventCondition_.wait(lock);
}
log("debug") << "STA" << ": [thread] handling event";
attachThread(true);
try {
threadNotify(*event_);
} catch (std::exception& e) {
log("error") << "STA" << ": [thread] Caught exception: " << e.what();
exception_ = true;
} catch (...) {
log("error") << "STA" << ": [thread] Caught exception";
exception_ = true;
}
attachThread(false);
signalDone();
if (finalized_)
break;
newEvent_ = false;
}
signalDone();
}
void SingleThreadedApplication::threadNotify(const Wt::WEvent& event)
{
Wt::WApplication::notify(event);
}
void SingleThreadedApplication::waitForEvent()
{
log("debug") << "STA" << ": [thread] waitForEvent()";
eventLock_->unlock();
try {
Wt::WApplication::waitForEvent();
} catch (...) {
eventLock_->lock();
throw;
}
eventLock_->lock();
log("debug") << "STA" << ": [thread] returning from waitForEvent()";
}
void SingleThreadedApplication::signalDone()
{
log("debug") << "STA" << ": [thread] signaling event done";
boost::mutex::scoped_lock lock(doneMutex_);
done_ = true;
doneCondition_.notify_one();
}
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