//! Dequeues log record from the queue, blocks if no log records are ready to be processed
bool dequeue_ready(record_view& rec)
{
unique_lock< mutex_type > lock(m_mutex);
while (!m_interruption_requested)
{
if (!m_queue.empty())
{
const boost::log::aux::timestamp now = boost::log::aux::get_timestamp();
enqueued_record const& elem = m_queue.top();
const uint64_t difference = (now - elem.m_timestamp).milliseconds();
if (difference >= m_ordering_window)
{
// We got a new element
rec = elem.m_record;
m_queue.pop();
return true;
}
else
{
// Wait until the element becomes ready to be processed
m_cond.timed_wait(lock, posix_time::milliseconds(m_ordering_window - difference));
}
}
else
{
// Wait for an element to come
m_cond.wait(lock);
}
}
m_interruption_requested = false;
return false;
}
typename meta::enable_if< is_time_interval< T >, bool >::type
timed_acquire_read( const T& ttl ) const
{
mutex::guard g( mutex_ );
while ( has_writer_ || writer_waiting_ )
{
if ( !reader_cv_.timed_wait( mutex_, ttl ) )
{
return false;
}
}
++reader_count_;
return true;
}
typename meta::enable_if< is_time_interval< T >, bool >::type
timed_acquire_write( const T& ttl ) const
{
mutex::guard g( mutex_ );
while ( reader_count_ || has_writer_ )
{
writer_waiting_ = true;
if ( !writer_cv_.timed_wait( mutex_, ttl ) )
{
if ( reader_count_ || has_writer_ )
{
writer_waiting_ = false;
writer_cv_.notify_one();
return false;
}
has_writer_ = true;
return true;
}
}
has_writer_ = true;
return true;
}