icinga2/lib/base/thinmutex.cpp

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/******************************************************************************
* Icinga 2 *
* Copyright (C) 2012-2013 Icinga Development Team (http://www.icinga.org/) *
* *
* This program is free software; you can redistribute it and/or *
* modify it under the terms of the GNU General Public License *
* as published by the Free Software Foundation; either version 2 *
* of the License, or (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the Free Software Foundation *
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. *
******************************************************************************/
#include "base/thinmutex.hpp"
#include "base/timer.hpp"
#include "base/convert.hpp"
#include "base/logger.hpp"
using namespace icinga;
/**
* Locks the mutex and inflates the lock.
*/
void ThinMutex::LockSlowPath(void)
{
unsigned int it = 0;
#ifdef _WIN32
# ifdef _WIN64
while (InterlockedCompareExchange64(&m_Data, THINLOCK_LOCKED, THINLOCK_UNLOCKED) != THINLOCK_UNLOCKED) {
# else /* _WIN64 */
while (InterlockedCompareExchange(&m_Data, THINLOCK_LOCKED, THINLOCK_UNLOCKED) != THINLOCK_UNLOCKED) {
# endif /* _WIN64 */
#else /* _WIN32 */
while (!__sync_bool_compare_and_swap(&m_Data, THINLOCK_UNLOCKED, THINLOCK_LOCKED)) {
#endif /* _WIN32 */
if (m_Data > THINLOCK_LOCKED) {
boost::mutex *mtx = reinterpret_cast<boost::mutex *>(m_Data);
mtx->lock();
return;
}
Spin(it);
it++;
}
boost::mutex *mtx = new boost::mutex();
mtx->lock();
#ifdef _WIN32
# ifdef _WIN64
InterlockedCompareExchange64(&m_Data, reinterpret_cast<LONGLONG>(mtx), THINLOCK_LOCKED);
# else /* _WIN64 */
InterlockedCompareExchange(&m_Data, reinterpret_cast<LONG>(mtx), THINLOCK_LOCKED);
# endif /* _WIN64 */
#else /* _WIN32 */
__sync_bool_compare_and_swap(&m_Data, THINLOCK_LOCKED, reinterpret_cast<uintptr_t>(mtx));
#endif /* _WIN32 */
}