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// Copyright (c) 2001-2004 NovodeX AG. All rights reserved.
// Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
// SPDX-FileCopyrightText: Copyright (c) 2008-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
// SPDX-License-Identifier: Apache-2.0
#include "foundation/PxAllocator.h"
#include "foundation/PxAtomic.h"
#include "foundation/PxSList.h"
#include "foundation/PxThread.h"
#include <pthread.h>
#if PX_EMSCRIPTEN
#define USE_MUTEX
#endif
namespace physx
{
namespace
{
#if defined(USE_MUTEX)
class ScopedMutexLock
{
pthread_mutex_t& mMutex;
public:
PX_INLINE ScopedMutexLock(pthread_mutex_t& mutex) : mMutex(mutex)
{
pthread_mutex_lock(&mMutex);
}
PX_INLINE ~ScopedMutexLock()
{
pthread_mutex_unlock(&mMutex);
}
};
typedef ScopedMutexLock ScopedLock;
#else
struct ScopedSpinLock
{
PX_FORCE_INLINE ScopedSpinLock(volatile int32_t& lock) : mLock(lock)
{
while(__sync_lock_test_and_set(&mLock, 1))
{
// spinning without atomics is usually
// causing less bus traffic. -> only one
// CPU is modifying the cache line.
while(lock)
PxSpinLockPause();
}
}
PX_FORCE_INLINE ~ScopedSpinLock()
{
__sync_lock_release(&mLock);
}
private:
volatile int32_t& mLock;
};
typedef ScopedSpinLock ScopedLock;
#endif
struct SListDetail
{
PxSListEntry* head;
#if defined(USE_MUTEX)
pthread_mutex_t lock;
#else
volatile int32_t lock;
#endif
};
template <typename T>
SListDetail* getDetail(T* impl)
{
return reinterpret_cast<SListDetail*>(impl);
}
}
PxSListImpl::PxSListImpl()
{
getDetail(this)->head = NULL;
#if defined(USE_MUTEX)
pthread_mutex_init(&getDetail(this)->lock, NULL);
#else
getDetail(this)->lock = 0; // 0 == unlocked
#endif
}
PxSListImpl::~PxSListImpl()
{
#if defined(USE_MUTEX)
pthread_mutex_destroy(&getDetail(this)->lock);
#endif
}
void PxSListImpl::push(PxSListEntry* entry)
{
ScopedLock lock(getDetail(this)->lock);
entry->mNext = getDetail(this)->head;
getDetail(this)->head = entry;
}
PxSListEntry* PxSListImpl::pop()
{
ScopedLock lock(getDetail(this)->lock);
PxSListEntry* result = getDetail(this)->head;
if(result != NULL)
getDetail(this)->head = result->mNext;
return result;
}
PxSListEntry* PxSListImpl::flush()
{
ScopedLock lock(getDetail(this)->lock);
PxSListEntry* result = getDetail(this)->head;
getDetail(this)->head = NULL;
return result;
}
uint32_t PxSListImpl::getSize()
{
return sizeof(SListDetail);
}
} // namespace physx