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check wakeup situation in rx() after dequeuing

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Issue #593
This commit is contained in:
Alexander Boettcher 2013-04-15 12:11:52 +02:00 committed by Norman Feske
parent 814652d243
commit 30927f68a7
1 changed files with 6 additions and 3 deletions
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9
os/include/os/packet_stream.h
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@ -199,6 +199,11 @@ class Packet_descriptor_queue
* Return true if a single element is stored in the queue
*/
bool single_element() { return (_tail + 1)%QUEUE_SIZE == _head; }
/**
* Return true if a single slot is left to be put into the queue
*/
bool single_slot_free() { return (_head + 2)%QUEUE_SIZE == _tail; }
};
@ -325,14 +330,12 @@ class Packet_descriptor_receiver
{
Genode::Lock::Guard lock_guard(_rx_queue_lock);
bool rx_queue_was_full = _rx_queue->full();
while (_rx_queue->empty())
_rx_ready.wait_for_signal();
*out_packet = _rx_queue->get();
if (rx_queue_was_full)
if (_rx_queue->single_slot_free())
_tx_ready.submit();
}
};