4a179d973b
The Users class now performs locking when a method is called. This will prevent concurrent access to the internal map of users. Added missing const versions of SpinLockGuard.
122 lines
2.5 KiB
C++
122 lines
2.5 KiB
C++
#pragma once
|
|
/*
|
|
* Copyright (c) 2016 MariaDB Corporation Ab
|
|
*
|
|
* Use of this software is governed by the Business Source License included
|
|
* in the LICENSE.TXT file and at www.mariadb.com/bsl11.
|
|
*
|
|
* Change Date: 2020-01-01
|
|
*
|
|
* On the date above, in accordance with the Business Source License, use
|
|
* of this software will be governed by version 2 or later of the General
|
|
* Public License.
|
|
*/
|
|
|
|
#include <maxscale/cppdefs.hh>
|
|
#include <maxscale/spinlock.h>
|
|
|
|
namespace maxscale
|
|
{
|
|
|
|
class SpinLockGuard;
|
|
|
|
/**
|
|
* @class SpinLock spinlock.hh <maxscale/spinlock.hh>
|
|
*
|
|
* The class SpinLock is a simple class that wraps a regular SPINLOCK
|
|
* and provides equivalent functionality.
|
|
*/
|
|
class SpinLock
|
|
{
|
|
public:
|
|
friend class SpinLockGuard;
|
|
|
|
/**
|
|
* Creates a spinlock.
|
|
*/
|
|
SpinLock()
|
|
{
|
|
spinlock_init(&m_lock);
|
|
}
|
|
|
|
~SpinLock()
|
|
{
|
|
}
|
|
|
|
/**
|
|
* Acquires the spinlock.
|
|
*/
|
|
void acquire() const
|
|
{
|
|
spinlock_acquire(&m_lock);
|
|
}
|
|
|
|
/**
|
|
* Releases the spinlock.
|
|
*/
|
|
void release() const
|
|
{
|
|
spinlock_release(&m_lock);
|
|
}
|
|
|
|
private:
|
|
SpinLock(const SpinLock&) /* = delete */;
|
|
SpinLock& operator = (const SpinLock&) /* = delete */;
|
|
|
|
private:
|
|
mutable SPINLOCK m_lock;
|
|
};
|
|
|
|
/**
|
|
* @class SpinLockGuard spinlock.hh <maxscale/spinlock.hh>
|
|
*
|
|
* The class SpinLockGuard is a spinlock wrapper that provides a RAII-style
|
|
* mechanism for owning a spinlock for the duration of a scoped block. When
|
|
* a SpinLockGuard object is created, it attempts to take ownership of the
|
|
* spinlock it is given. When control leaves the scope in which the
|
|
* SpinLockGuard object was created, the SpinLockGuard is destructed and the
|
|
* mutex is released.
|
|
*/
|
|
class SpinLockGuard
|
|
{
|
|
public:
|
|
/**
|
|
* Creates the guard and locks the provided lock.
|
|
*
|
|
* @param lock The spinlock to lock.
|
|
*/
|
|
SpinLockGuard(const SPINLOCK& lock)
|
|
: m_lock(lock)
|
|
{
|
|
spinlock_acquire(&m_lock);
|
|
}
|
|
|
|
/**
|
|
* Creates the guard and locks the provided lock.
|
|
*
|
|
* @param lock The spinlock to lock.
|
|
*/
|
|
SpinLockGuard(const SpinLock& lock)
|
|
: m_lock(lock.m_lock)
|
|
{
|
|
spinlock_acquire(&m_lock);
|
|
}
|
|
|
|
/**
|
|
* Destroys the guard and unlocks the lock that was provided when
|
|
* the guard was created.
|
|
*/
|
|
~SpinLockGuard()
|
|
{
|
|
spinlock_release(&m_lock);
|
|
}
|
|
|
|
private:
|
|
SpinLockGuard(const SpinLockGuard&) /* = delete */;
|
|
SpinLockGuard& operator = (const SpinLockGuard&) /* = delete */;
|
|
|
|
const SPINLOCK& m_lock;
|
|
};
|
|
|
|
}
|