mirror of
https://github.com/Icinga/icinga2.git
synced 2025-11-03 21:25:56 +01:00
137 lines
3.9 KiB
C++
137 lines
3.9 KiB
C++
/******************************************************************************
|
|
* Icinga 2 *
|
|
* Copyright (C) 2012-2018 Icinga Development Team (https://www.icinga.com/) *
|
|
* *
|
|
* 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/objectlock.hpp"
|
|
#include <boost/thread/recursive_mutex.hpp>
|
|
|
|
using namespace icinga;
|
|
|
|
#define I2MUTEX_UNLOCKED 0
|
|
#define I2MUTEX_LOCKED 1
|
|
|
|
ObjectLock::~ObjectLock()
|
|
{
|
|
Unlock();
|
|
}
|
|
|
|
ObjectLock::ObjectLock(const Object::Ptr& object)
|
|
: m_Object(object.get()), m_Locked(false)
|
|
{
|
|
if (m_Object)
|
|
Lock();
|
|
}
|
|
|
|
ObjectLock::ObjectLock(const Object *object)
|
|
: m_Object(object), m_Locked(false)
|
|
{
|
|
if (m_Object)
|
|
Lock();
|
|
}
|
|
|
|
void ObjectLock::LockMutex(const Object *object)
|
|
{
|
|
unsigned int it = 0;
|
|
|
|
#ifdef _WIN32
|
|
# ifdef _WIN64
|
|
while (likely(InterlockedCompareExchange64((LONGLONG *)&object->m_Mutex, I2MUTEX_LOCKED, I2MUTEX_UNLOCKED) != I2MUTEX_UNLOCKED)) {
|
|
# else /* _WIN64 */
|
|
while (likely(InterlockedCompareExchange(&object->m_Mutex, I2MUTEX_LOCKED, I2MUTEX_UNLOCKED) != I2MUTEX_UNLOCKED)) {
|
|
# endif /* _WIN64 */
|
|
#else /* _WIN32 */
|
|
while (likely(!__sync_bool_compare_and_swap(&object->m_Mutex, I2MUTEX_UNLOCKED, I2MUTEX_LOCKED))) {
|
|
#endif /* _WIN32 */
|
|
if (likely(object->m_Mutex > I2MUTEX_LOCKED)) {
|
|
auto *mtx = reinterpret_cast<boost::recursive_mutex *>(object->m_Mutex);
|
|
mtx->lock();
|
|
|
|
return;
|
|
}
|
|
|
|
Spin(it);
|
|
it++;
|
|
}
|
|
|
|
auto *mtx = new boost::recursive_mutex();
|
|
mtx->lock();
|
|
#ifdef _WIN32
|
|
# ifdef _WIN64
|
|
InterlockedCompareExchange64((LONGLONG *)&object->m_Mutex, reinterpret_cast<LONGLONG>(mtx), I2MUTEX_LOCKED);
|
|
# else /* _WIN64 */
|
|
InterlockedCompareExchange(&object->m_Mutex, reinterpret_cast<LONG>(mtx), I2MUTEX_LOCKED);
|
|
# endif /* _WIN64 */
|
|
#else /* _WIN32 */
|
|
__sync_bool_compare_and_swap(&object->m_Mutex, I2MUTEX_LOCKED, reinterpret_cast<uintptr_t>(mtx));
|
|
#endif /* _WIN32 */
|
|
}
|
|
|
|
void ObjectLock::Lock()
|
|
{
|
|
ASSERT(!m_Locked && m_Object);
|
|
|
|
LockMutex(m_Object);
|
|
|
|
m_Locked = true;
|
|
|
|
#ifdef I2_DEBUG
|
|
# ifdef _WIN32
|
|
InterlockedExchange(&m_Object->m_LockOwner, GetCurrentThreadId());
|
|
# else /* _WIN32 */
|
|
__sync_lock_test_and_set(&m_Object->m_LockOwner, pthread_self());
|
|
# endif /* _WIN32 */
|
|
#endif /* I2_DEBUG */
|
|
}
|
|
|
|
void ObjectLock::Spin(unsigned int it)
|
|
{
|
|
if (it < 8) {
|
|
/* Do nothing. */
|
|
}
|
|
#ifdef SPIN_PAUSE
|
|
else if (it < 16) {
|
|
SPIN_PAUSE();
|
|
}
|
|
#endif /* SPIN_PAUSE */
|
|
else {
|
|
#ifdef _WIN32
|
|
Sleep(0);
|
|
#else /* _WIN32 */
|
|
sched_yield();
|
|
#endif /* _WIN32 */
|
|
}
|
|
}
|
|
|
|
void ObjectLock::Unlock()
|
|
{
|
|
#ifdef I2_DEBUG
|
|
if (m_Locked) {
|
|
# ifdef _WIN32
|
|
InterlockedExchange(&m_Object->m_LockOwner, 0);
|
|
# else /* _WIN32 */
|
|
__sync_lock_release(&m_Object->m_LockOwner);
|
|
# endif /* _WIN32 */
|
|
}
|
|
#endif /* I2_DEBUG */
|
|
|
|
if (m_Locked) {
|
|
reinterpret_cast<boost::recursive_mutex *>(m_Object->m_Mutex)->unlock();
|
|
m_Locked = false;
|
|
}
|
|
}
|