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////////////////////////////////////////////////////////////
//
// SFML - Simple and Fast Multimedia Library
// Copyright (C) 2007-2014 Marco Antognini (antognini.marco@gmail.com),
// Laurent Gomila (laurent.gom@gmail.com),
//
// This software is provided 'as-is', without any express or implied warranty.
// In no event will the authors be held liable for any damages arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it freely,
// subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented;
// you must not claim that you wrote the original software.
// If you use this software in a product, an acknowledgment
// in the product documentation would be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such,
// and must not be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source distribution.
//
////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////
// Headers
////////////////////////////////////////////////////////////
#include <SFML/System/Err.hpp>
#include <SFML/System/NonCopyable.hpp>
#include <SFML/System/ThreadLocalPtr.hpp>
#include <cassert>
#import <SFML/Window/OSX/AutoreleasePoolWrapper.h>
#import <Foundation/Foundation.h>
////////////////////////////////////////////////////////////
/// Here we manage one and only one pool by thread. This prevents draining one
/// pool and making other pools invalid which can lead to a crash on 10.5 and an
/// annoying message on 10.6 (*** attempt to pop an unknown autorelease pool).
///
/// Because NSAutoreleasePool cannot be retain we have to do it ourself.
/// We use an sf::ThreadLocalPtr to have one PoolWrapper in each thread.
///
/// SPECIAL CONSIDERATION:
/// ======================
/// This implies that if retainPool is called X times in a thread Y then
/// releasePool must be called X times too in the same thread Y.
///
////////////////////////////////////////////////////////////
namespace sf
{
namespace priv
{
////////////////////////////////////////////////////////////
/// \brief C++ Wrapper of Obj-C Autorelease Pool
///
////////////////////////////////////////////////////////////
class PoolWrapper : NonCopyable
{
public:
////////////////////////////////////////////////////////////
/// \brief Default constructor
///
////////////////////////////////////////////////////////////
PoolWrapper();
////////////////////////////////////////////////////////////
/// \brief Default destructor
///
/// Make sure the pool is drained (if appropriate)
///
////////////////////////////////////////////////////////////
~PoolWrapper();
////////////////////////////////////////////////////////////
/// \brief Increment retain count and allocate memory if needed
///
////////////////////////////////////////////////////////////
void retain();
////////////////////////////////////////////////////////////
/// \brief Decrement retain count and releasing memory if needed
///
/// \return true if the pool wrapper can be released
///
////////////////////////////////////////////////////////////
bool release();
////////////////////////////////////////////////////////////
/// \brief Drain the pool
///
////////////////////////////////////////////////////////////
void drain();
private:
////////////////////////////////////////////////////////////
// Member data
////////////////////////////////////////////////////////////
int m_count; ///< How many times was the pool retained?
NSAutoreleasePool* m_pool; ///< Our dedicated pool
};
////////////////////////////////////////////////////////////
PoolWrapper::PoolWrapper() :
m_count(0),
m_pool(nil)
{
/* Nothing else */
}
////////////////////////////////////////////////////////////
PoolWrapper::~PoolWrapper()
{
// Make sure everything is drained
m_count = 0;
drain();
}
////////////////////////////////////////////////////////////
void PoolWrapper::retain()
{
// Increase counter
++m_count;
// Allocate pool if required
if (m_pool == nil)
m_pool = [[NSAutoreleasePool alloc] init];
}
////////////////////////////////////////////////////////////
bool PoolWrapper::release()
{
// Decrease counter
--m_count;
return m_count == 0;
}
void PoolWrapper::drain()
{
[m_pool drain];
m_pool = nil;
if (m_count != 0)
m_pool = [[NSAutoreleasePool alloc] init];
}
} // namespace priv
} // namespace sf
////////////////////////////////////////////////////////////
// Private data
////////////////////////////////////////////////////////////
namespace
{
// This per-thread variable holds the current autorelease pool for each thread
sf::ThreadLocalPtr<sf::priv::PoolWrapper> localPool;
}
////////////////////////////////////////////////////////////
void retainPool(void)
{
// First, Check that we have a valid PoolWrapper object in our local pool.
if (localPool == NULL)
localPool = new sf::priv::PoolWrapper();
// Then retains!
localPool->retain();
}
////////////////////////////////////////////////////////////
void drainCurrentPool(void)
{
assert(localPool != NULL);
localPool->drain();
}
////////////////////////////////////////////////////////////
void releasePool(void)
{
assert(localPool != NULL);
// If we're done with the pool, let's release the memory
if (localPool->release())
{
delete localPool;
localPool = NULL;
}
}
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