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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*/
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsISupports.h"
#include "mozilla/net/ChannelEventQueue.h"
#include "mozilla/Unused.h"
#include "nsThreadUtils.h"
#include "mozilla/Unused.h"
namespace mozilla {
namespace net {
ChannelEvent*
ChannelEventQueue::TakeEvent()
{
MutexAutoLock lock(mMutex);
MOZ_ASSERT(mFlushing);
if (mSuspended || mEventQueue.IsEmpty()) {
return nullptr;
}
UniquePtr<ChannelEvent> event(Move(mEventQueue[0]));
mEventQueue.RemoveElementAt(0);
return event.release();
}
void
ChannelEventQueue::FlushQueue()
{
// Events flushed could include destruction of channel (and our own
// destructor) unless we make sure its refcount doesn't drop to 0 while this
// method is running.
nsCOMPtr<nsISupports> kungFuDeathGrip(mOwner);
mozilla::Unused << kungFuDeathGrip; // Not used in this function
// Prevent flushed events from flushing the queue recursively
{
MutexAutoLock lock(mMutex);
mFlushing = true;
}
while (true) {
UniquePtr<ChannelEvent> event(TakeEvent());
if (!event) {
break;
}
event->Run();
}
MutexAutoLock lock(mMutex);
mFlushing = false;
}
void
ChannelEventQueue::Resume()
{
MutexAutoLock lock(mMutex);
// Resuming w/o suspend: error in debug mode, ignore in build
MOZ_ASSERT(mSuspendCount > 0);
if (mSuspendCount <= 0) {
return;
}
if (!--mSuspendCount) {
RefPtr<Runnable> event =
NewRunnableMethod(this, &ChannelEventQueue::CompleteResume);
if (mTargetThread) {
mTargetThread->Dispatch(event.forget(), NS_DISPATCH_NORMAL);
} else {
MOZ_RELEASE_ASSERT(NS_IsMainThread());
Unused << NS_WARN_IF(NS_FAILED(NS_DispatchToCurrentThread(event.forget())));
}
}
}
nsresult
ChannelEventQueue::RetargetDeliveryTo(nsIEventTarget* aTargetThread)
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
MOZ_RELEASE_ASSERT(!mTargetThread);
MOZ_RELEASE_ASSERT(aTargetThread);
mTargetThread = do_QueryInterface(aTargetThread);
MOZ_RELEASE_ASSERT(mTargetThread);
return NS_OK;
}
} // namespace net
} // namespace mozilla
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