mirror of https://github.com/Icinga/icinga2.git
159 lines
4.2 KiB
C++
159 lines
4.2 KiB
C++
/******************************************************************************
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* Icinga 2 *
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* Copyright (C) 2012-2017 Icinga Development Team (https://www.icinga.com/) *
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* *
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* This program is free software; you can redistribute it and/or *
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* modify it under the terms of the GNU General Public License *
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* as published by the Free Software Foundation; either version 2 *
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* of the License, or (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the Free Software Foundation *
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. *
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******************************************************************************/
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#ifndef OBJECTLOCK_H
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#define OBJECTLOCK_H
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#include "base/object.hpp"
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#define I2MUTEX_UNLOCKED 0
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#define I2MUTEX_LOCKED 1
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namespace icinga
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{
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/**
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* A scoped lock for Objects.
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*/
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struct I2_BASE_API ObjectLock
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{
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public:
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ObjectLock(void)
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: m_Object(nullptr), m_Locked(false)
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{ }
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~ObjectLock(void)
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{
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Unlock();
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}
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ObjectLock(const Object::Ptr& object)
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: m_Object(object.get()), m_Locked(false)
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{
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if (m_Object)
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Lock();
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}
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ObjectLock(const Object *object)
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: m_Object(object), m_Locked(false)
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{
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if (m_Object)
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Lock();
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}
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static void LockMutex(const Object *object)
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{
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unsigned int it = 0;
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#ifdef _WIN32
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# ifdef _WIN64
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while (likely(InterlockedCompareExchange64((LONGLONG *)&object->m_Mutex, I2MUTEX_LOCKED, I2MUTEX_UNLOCKED) != I2MUTEX_UNLOCKED)) {
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# else /* _WIN64 */
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while (likely(InterlockedCompareExchange(&object->m_Mutex, I2MUTEX_LOCKED, I2MUTEX_UNLOCKED) != I2MUTEX_UNLOCKED)) {
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# endif /* _WIN64 */
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#else /* _WIN32 */
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while (likely(!__sync_bool_compare_and_swap(&object->m_Mutex, I2MUTEX_UNLOCKED, I2MUTEX_LOCKED))) {
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#endif /* _WIN32 */
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if (likely(object->m_Mutex > I2MUTEX_LOCKED)) {
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boost::recursive_mutex *mtx = reinterpret_cast<boost::recursive_mutex *>(object->m_Mutex);
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mtx->lock();
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return;
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}
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Spin(it);
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it++;
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}
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boost::recursive_mutex *mtx = new boost::recursive_mutex();
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mtx->lock();
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#ifdef _WIN32
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# ifdef _WIN64
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InterlockedCompareExchange64((LONGLONG *)&object->m_Mutex, reinterpret_cast<LONGLONG>(mtx), I2MUTEX_LOCKED);
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# else /* _WIN64 */
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InterlockedCompareExchange(&object->m_Mutex, reinterpret_cast<LONG>(mtx), I2MUTEX_LOCKED);
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# endif /* _WIN64 */
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#else /* _WIN32 */
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__sync_bool_compare_and_swap(&object->m_Mutex, I2MUTEX_LOCKED, reinterpret_cast<uintptr_t>(mtx));
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#endif /* _WIN32 */
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}
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void Lock(void)
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{
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ASSERT(!m_Locked && m_Object);
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LockMutex(m_Object);
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m_Locked = true;
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#ifdef I2_DEBUG
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# ifdef _WIN32
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InterlockedExchange(&m_Object->m_LockOwner, GetCurrentThreadId());
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# else /* _WIN32 */
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__sync_lock_test_and_set(&m_Object->m_LockOwner, pthread_self());
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# endif /* _WIN32 */
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#endif /* I2_DEBUG */
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}
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static void Spin(unsigned int it)
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{
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if (it < 8) {
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/* Do nothing. */
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}
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#ifdef SPIN_PAUSE
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else if (it < 16) {
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SPIN_PAUSE();
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}
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#endif /* SPIN_PAUSE */
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else {
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#ifdef _WIN32
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Sleep(0);
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#else /* _WIN32 */
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sched_yield();
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#endif /* _WIN32 */
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}
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}
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void Unlock(void)
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{
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#ifdef I2_DEBUG
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if (m_Locked) {
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# ifdef _WIN32
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InterlockedExchange(&m_Object->m_LockOwner, 0);
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# else /* _WIN32 */
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__sync_lock_release(&m_Object->m_LockOwner);
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# endif /* _WIN32 */
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}
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#endif /* I2_DEBUG */
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if (m_Locked) {
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reinterpret_cast<boost::recursive_mutex *>(m_Object->m_Mutex)->unlock();
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m_Locked = false;
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}
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}
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private:
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const Object *m_Object;
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bool m_Locked;
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};
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}
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#endif /* OBJECTLOCK_H */
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