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// Copyright (C) 2012 Internet Systems Consortium, Inc. ("ISC")
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
// OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
// PERFORMANCE OF THIS SOFTWARE.
#ifndef INTERPROCESS_SYNC_NULL_H
#define INTERPROCESS_SYNC_NULL_H
#include <log/interprocess/interprocess_sync.h>
namespace isc {
namespace log {
namespace interprocess {
/// \brief Null Interprocess Sync Class
///
/// This class specifies a concrete implementation for a null (no effect)
/// interprocess synchronization mechanism. Please see the
/// InterprocessSync class documentation for usage.
class InterprocessSyncNull : public InterprocessSync {
public:
/// \brief Constructor
///
/// Creates a null interprocess synchronization object
///
/// \param task_name Name of the synchronization task. This has to be
/// identical among the various processes that need to be
/// synchronized for the same task.
InterprocessSyncNull(const std::string& task_name) :
InterprocessSync(task_name)
{}
/// \brief Destructor
virtual ~InterprocessSyncNull();
protected:
/// \brief Acquire the lock (never blocks)
///
/// \return Always returns true
bool lock();
/// \brief Try to acquire a lock (doesn't block)
///
/// \return Always returns true
bool tryLock();
/// \brief Release the lock
///
/// \return Always returns true
bool unlock();
};
} // namespace interprocess
} // namespace log
} // namespace isc
#endif // INTERPROCESS_SYNC_NULL_H
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