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source/fixed_pool.cpp

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+///////////////////////////////////////////////////////////////////////////////
+// Copyright (c) Electronic Arts Inc. All rights reserved.
+///////////////////////////////////////////////////////////////////////////////
+
+
+#include <EASTL/internal/fixed_pool.h>
+#include <EASTL/fixed_allocator.h>
+
+
+
+namespace eastl
+{
+
+
+	EASTL_API void fixed_pool_base::init(void* pMemory, size_t memorySize, size_t nodeSize,
+							   size_t alignment, size_t /*alignmentOffset*/)
+	{
+		// To do: Support alignmentOffset.
+
+		#if EASTL_FIXED_SIZE_TRACKING_ENABLED
+			mnCurrentSize = 0;
+			mnPeakSize    = 0;
+		#endif
+
+		if(pMemory)
+		{
+			// Assert that alignment is a power of 2 value (e.g. 1, 2, 4, 8, 16, etc.)
+			EASTL_ASSERT((alignment & (alignment - 1)) == 0);
+
+			// Make sure alignment is a valid value.
+			if(alignment < 1)
+				alignment = 1;
+
+			mpNext      = (Link*)(((uintptr_t)pMemory + (alignment - 1)) & ~(alignment - 1));
+			memorySize -= (uintptr_t)mpNext - (uintptr_t)pMemory;
+			pMemory     = mpNext;
+
+			// The node size must be at least as big as a Link, which itself is sizeof(void*).
+			if(nodeSize < sizeof(Link))
+				nodeSize = ((sizeof(Link) + (alignment - 1))) & ~(alignment - 1);
+
+			// If the user passed in a memory size that wasn't a multiple of the node size,
+			// we need to chop down the memory size so that the last node is not a whole node.
+			memorySize = (memorySize / nodeSize) * nodeSize;
+
+			mpCapacity = (Link*)((uintptr_t)pMemory + memorySize);
+			mpHead     = NULL;
+			mnNodeSize = nodeSize;
+		}
+	}
+
+
+} // namespace eastl
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