NS_IMETHODIMP
nsInputStreamPump::OnInputStreamReady(nsIAsyncInputStream *stream)
{
LOG(("nsInputStreamPump::OnInputStreamReady [this=%x]\n", this));
SAMPLE_LABEL("Input", "nsInputStreamPump::OnInputStreamReady");
// this function has been called from a PLEvent, so we can safely call
// any listener or progress sink methods directly from here.
for (;;) {
if (mSuspendCount || mState == STATE_IDLE) {
mWaiting = false;
break;
}
PRUint32 nextState;
switch (mState) {
case STATE_START:
nextState = OnStateStart();
break;
case STATE_TRANSFER:
nextState = OnStateTransfer();
break;
case STATE_STOP:
nextState = OnStateStop();
break;
default:
nextState = 0;
NS_NOTREACHED("Unknown enum value.");
return NS_ERROR_UNEXPECTED;
}
if (mState == nextState && !mSuspendCount) {
NS_ASSERTION(mState == STATE_TRANSFER, "unexpected state");
NS_ASSERTION(NS_SUCCEEDED(mStatus), "unexpected status");
mWaiting = false;
mStatus = EnsureWaiting();
if (NS_SUCCEEDED(mStatus))
break;
nextState = STATE_STOP;
}
mState = nextState;
}
return NS_OK;
}
NS_IMETHODIMP
nsInputStreamPump::OnInputStreamReady(nsIAsyncInputStream *stream)
{
LOG(("nsInputStreamPump::OnInputStreamReady [this=%p]\n", this));
PROFILER_LABEL("nsInputStreamPump", "OnInputStreamReady",
js::ProfileEntry::Category::NETWORK);
// this function has been called from a PLEvent, so we can safely call
// any listener or progress sink methods directly from here.
for (;;) {
// There should only be one iteration of this loop happening at a time.
// To prevent AsyncWait() (called during callbacks or on other threads)
// from creating a parallel OnInputStreamReady(), we use:
// -- a monitor; and
// -- a boolean mProcessingCallbacks to detect parallel loops
// when exiting the monitor for callbacks.
ReentrantMonitorAutoEnter lock(mMonitor);
// Prevent parallel execution during callbacks, while out of monitor.
if (mProcessingCallbacks) {
MOZ_ASSERT(!mProcessingCallbacks);
break;
}
mProcessingCallbacks = true;
if (mSuspendCount || mState == STATE_IDLE) {
mWaitingForInputStreamReady = false;
mProcessingCallbacks = false;
break;
}
uint32_t nextState;
switch (mState) {
case STATE_START:
nextState = OnStateStart();
break;
case STATE_TRANSFER:
nextState = OnStateTransfer();
break;
case STATE_STOP:
mRetargeting = false;
nextState = OnStateStop();
break;
default:
nextState = 0;
NS_NOTREACHED("Unknown enum value.");
return NS_ERROR_UNEXPECTED;
}
bool stillTransferring = (mState == STATE_TRANSFER &&
nextState == STATE_TRANSFER);
if (stillTransferring) {
NS_ASSERTION(NS_SUCCEEDED(mStatus),
"Should not have failed status for ongoing transfer");
} else {
NS_ASSERTION(mState != nextState,
"Only OnStateTransfer can be called more than once.");
}
if (mRetargeting) {
NS_ASSERTION(mState != STATE_STOP,
"Retargeting should not happen during OnStateStop.");
}
// Set mRetargeting so EnsureWaiting will be called. It ensures that
// OnStateStop is called on the main thread.
if (nextState == STATE_STOP && !NS_IsMainThread()) {
mRetargeting = true;
}
// Unset mProcessingCallbacks here (while we have lock) so our own call to
// EnsureWaiting isn't blocked by it.
mProcessingCallbacks = false;
// We must break the loop when we're switching event delivery to another
// thread and the input stream pump is suspended, otherwise
// OnStateStop() might be called off the main thread. See bug 1026951
// comment #107 for the exact scenario.
if (mSuspendCount && mRetargeting) {
mState = nextState;
mWaitingForInputStreamReady = false;
break;
}
// Wait asynchronously if there is still data to transfer, or we're
// switching event delivery to another thread.
if (!mSuspendCount && (stillTransferring || mRetargeting)) {
mState = nextState;
mWaitingForInputStreamReady = false;
nsresult rv = EnsureWaiting();
if (NS_SUCCEEDED(rv))
break;
// Failure to start asynchronous wait: stop transfer.
// Do not set mStatus if it was previously set to report a failure.
if (NS_SUCCEEDED(mStatus)) {
mStatus = rv;
}
nextState = STATE_STOP;
}
mState = nextState;
}
return NS_OK;
}
NS_IMETHODIMP
nsInputStreamPump::OnInputStreamReady(nsIAsyncInputStream *stream)
{
LOG(("nsInputStreamPump::OnInputStreamReady [this=%p]\n", this));
PROFILER_LABEL("Input", "nsInputStreamPump::OnInputStreamReady");
// this function has been called from a PLEvent, so we can safely call
// any listener or progress sink methods directly from here.
for (;;) {
if (mSuspendCount || mState == STATE_IDLE) {
mWaiting = false;
break;
}
uint32_t nextState;
switch (mState) {
case STATE_START:
nextState = OnStateStart();
break;
case STATE_TRANSFER:
nextState = OnStateTransfer();
break;
case STATE_STOP:
mRetargeting = false;
nextState = OnStateStop();
break;
default:
nextState = 0;
NS_NOTREACHED("Unknown enum value.");
return NS_ERROR_UNEXPECTED;
}
bool stillTransferring = (mState == STATE_TRANSFER &&
nextState == STATE_TRANSFER);
if (stillTransferring) {
NS_ASSERTION(NS_SUCCEEDED(mStatus),
"Should not have failed status for ongoing transfer");
} else {
NS_ASSERTION(mState != nextState,
"Only OnStateTransfer can be called more than once.");
}
if (mRetargeting) {
NS_ASSERTION(mState != STATE_STOP,
"Retargeting should not happen during OnStateStop.");
}
// Set mRetargeting so EnsureWaiting will be called. It ensures that
// OnStateStop is called on the main thread.
if (nextState == STATE_STOP && !NS_IsMainThread()) {
mRetargeting = true;
}
// Wait asynchronously if there is still data to transfer, or we're
// switching event delivery to another thread.
if (!mSuspendCount && (stillTransferring || mRetargeting)) {
mState = nextState;
mWaiting = false;
nsresult rv = EnsureWaiting();
if (NS_SUCCEEDED(rv))
break;
// Failure to start asynchronous wait: stop transfer.
// Do not set mStatus if it was previously set to report a failure.
if (NS_SUCCEEDED(mStatus)) {
mStatus = rv;
}
nextState = STATE_STOP;
}
mState = nextState;
}
return NS_OK;
}
