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// Copyright (C) 2009-2010, Vaclav Haisman. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modifica-
// tion, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
// FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// APACHE SOFTWARE FOUNDATION OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
// INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLU-
// DING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
// OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
// ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
// THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "dcmtk/oflog/config.h"
#ifndef DCMTK_LOG4CPLUS_SINGLE_THREADED
#include "dcmtk/oflog/helpers/queue.h"
#include "dcmtk/oflog/helpers/loglog.h"
#include "dcmtk/oflog/thread/syncpub.h"
#include <stdexcept>
#include <algorithm>
#include <iterator>
namespace dcmtk {
namespace log4cplus { namespace thread {
Queue::Queue (unsigned len)
: queue()
, mutex (Mutex::DEFAULT)
, ev_consumer (false)
, sem (len, len)
, flags (DRAIN)
{ }
Queue::~Queue ()
{ }
Queue::flags_type
Queue::put_event (spi::InternalLoggingEvent const & ev)
{
flags_type ret_flags = ERROR_BIT;
try
{
ev.gatherThreadSpecificData ();
SemaphoreGuard semguard (sem);
MutexGuard mguard (mutex);
ret_flags |= flags;
if (flags & EXIT)
{
ret_flags &= ~(ERROR_BIT | ERROR_AFTER);
return ret_flags;
}
else
{
queue.push_back (ev);
ret_flags |= ERROR_AFTER;
semguard.detach ();
flags |= QUEUE;
ret_flags |= flags;
mguard.unlock ();
mguard.detach ();
ev_consumer.signal ();
}
}
catch (STD_NAMESPACE runtime_error const & e)
{
(void)e;
return ret_flags;
}
ret_flags &= ~(ERROR_BIT | ERROR_AFTER);
return ret_flags;
}
Queue::flags_type
Queue::signal_exit (bool drain)
{
flags_type ret_flags = 0;
try
{
MutexGuard mguard (mutex);
ret_flags |= flags;
if (! (flags & EXIT))
{
if (drain)
flags |= DRAIN;
else
flags &= ~DRAIN;
flags |= EXIT;
ret_flags = flags;
mguard.unlock ();
mguard.detach ();
ev_consumer.signal ();
}
}
catch (STD_NAMESPACE runtime_error const & e)
{
(void)e;
ret_flags |= ERROR_BIT;
return ret_flags;
}
return ret_flags;
}
Queue::flags_type
Queue::get_events (queue_storage_type * buf)
{
flags_type ret_flags = 0;
try
{
while (true)
{
MutexGuard mguard (mutex);
ret_flags = flags;
if (((QUEUE & flags) && ! (EXIT & flags))
|| ((EXIT | DRAIN | QUEUE) & flags) == (EXIT | DRAIN | QUEUE))
{
assert (! queue.empty ());
size_t const cnt = queue.size ();
queue.swap (*buf);
queue.clear ();
flags &= ~QUEUE;
for (size_t i = 0; i != cnt; ++i)
sem.unlock ();
ret_flags = flags | EVENT;
break;
}
else if (((EXIT | QUEUE) & flags) == (EXIT | QUEUE))
{
assert (! queue.empty ());
queue.clear ();
flags &= ~QUEUE;
ev_consumer.reset ();
sem.unlock ();
ret_flags = flags;
break;
}
else if (EXIT & flags)
break;
else
{
ev_consumer.reset ();
mguard.unlock ();
mguard.detach ();
ev_consumer.wait ();
}
}
}
catch (STD_NAMESPACE runtime_error const & e)
{
(void)e;
ret_flags |= ERROR_BIT;
}
return ret_flags;
}
} } // namespace log4cplus { namespace thread {
} // end namespace dcmtk
#endif // DCMTK_LOG4CPLUS_SINGLE_THREADED
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