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avoid creating shared memory segments with same key multiple times

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This commit is contained in:
Erwin Coumans
2017-01-06 09:55:22 -08:00
parent 8e554a0c1b
commit 8f02e75d98
1 changed files with 21 additions and 0 deletions
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21
examples/SharedMemory/PosixSharedMemory.cpp
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@@ -66,6 +66,27 @@ struct btPointerCaster
void* PosixSharedMemory::allocateSharedMemory(int key, int size, bool allowCreation) void* PosixSharedMemory::allocateSharedMemory(int key, int size, bool allowCreation)
{ {
#ifdef TEST_SHARED_MEMORY #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 flags = (allowCreation ? IPC_CREAT : 0) | 0666;
int id = shmget((key_t) key, (size_t) size,flags); int id = shmget((key_t) key, (size_t) size,flags);
if (id < 0) if (id < 0)