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#include "PosixSharedMemory.h"
#include "Bullet3Common/b3Logging.h"
#include "LinearMath/btScalar.h" //for btAssert
#include "LinearMath/btAlignedObjectArray.h"
//Windows implementation is in Win32SharedMemory.cpp
#ifndef _WIN32
#define TEST_SHARED_MEMORY
#endif //_WIN32
#include <stddef.h>
#ifdef TEST_SHARED_MEMORY
#include <sys/shm.h>
#include <sys/ipc.h>
#endif
struct btSharedMemorySegment
{
int m_key;
int m_sharedMemoryId;
void* m_sharedMemoryPtr;
bool m_createdSharedMemory;
btSharedMemorySegment()
: m_sharedMemoryId(-1),
m_sharedMemoryPtr(0),
m_createdSharedMemory(true)
{
}
};
struct PosixSharedMemoryInteralData
{
btAlignedObjectArray<btSharedMemorySegment> m_segments;
PosixSharedMemoryInteralData()
{
}
};
PosixSharedMemory::PosixSharedMemory()
{
m_internalData = new PosixSharedMemoryInteralData;
}
PosixSharedMemory::~PosixSharedMemory()
{
delete m_internalData;
}
struct btPointerCaster
{
union {
void* ptr;
ptrdiff_t integer;
};
};
void* PosixSharedMemory::allocateSharedMemory(int key, int size, bool allowCreation)
{
#ifdef TEST_SHARED_MEMORY
{
btSharedMemorySegment* seg = 0;
int i = 0;
for (i = 0; i < m_internalData->m_segments.size(); i++)
{
if (m_internalData->m_segments[i].m_key == key)
{
seg = &m_internalData->m_segments[i];
break;
}
}
if (seg)
{
b3Error("already created shared memory segment using same key");
return seg->m_sharedMemoryPtr;
}
}
int flags = (allowCreation ? IPC_CREAT : 0) | 0666;
int id = shmget((key_t)key, (size_t)size, flags);
if (id < 0)
{
//b3Warning("shmget error1");
}
else
{
btPointerCaster result;
result.ptr = shmat(id, 0, 0);
if (result.integer == -1)
{
b3Error("shmat returned -1");
}
else
{
btSharedMemorySegment seg;
seg.m_key = key;
seg.m_createdSharedMemory = allowCreation;
seg.m_sharedMemoryId = id;
seg.m_sharedMemoryPtr = result.ptr;
m_internalData->m_segments.push_back(seg);
return result.ptr;
}
}
#else
//not implemented yet
btAssert(0);
#endif
return 0;
}
void PosixSharedMemory::releaseSharedMemory(int key, int size)
{
#ifdef TEST_SHARED_MEMORY
btSharedMemorySegment* seg = 0;
int i = 0;
for (i = 0; i < m_internalData->m_segments.size(); i++)
{
if (m_internalData->m_segments[i].m_key == key)
{
seg = &m_internalData->m_segments[i];
break;
}
}
if (0 == seg)
{
b3Error("PosixSharedMemory::releaseSharedMemory: shared memory key not found");
return;
}
if (seg->m_sharedMemoryId < 0)
{
b3Error("PosixSharedMemory::releaseSharedMemory: shared memory id is not set");
}
else
{
if (seg->m_createdSharedMemory)
{
int result = shmctl(seg->m_sharedMemoryId, IPC_RMID, 0);
if (result == -1)
{
b3Error("PosixSharedMemory::releaseSharedMemory: shmat returned -1");
}
else
{
b3Printf("PosixSharedMemory::releaseSharedMemory removed shared memory");
}
seg->m_createdSharedMemory = false;
seg->m_sharedMemoryId = -1;
}
if (seg->m_sharedMemoryPtr)
{
shmdt(seg->m_sharedMemoryPtr);
seg->m_sharedMemoryPtr = 0;
b3Printf("PosixSharedMemory::releaseSharedMemory detached shared memory\n");
}
}
m_internalData->m_segments.removeAtIndex(i);
#endif
}
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