How to change malloc memory alignment, 64-bits system must align 16-bytes, 32-bits system must align 8-bytes.

[jianjunjiang]

The memory address allocated by the malloc function must be aligned twice void *, which means that for 64-bit system, 16-byte alignment is required, and for 32-bit system requires 8-byte alignment.

If you simply modify the macro definition, TLSF will crash directly. How to do this modification?

diff --git a/tlsf.c b/tlsf.c
index af57573..6e87539 100644
--- a/tlsf.c
+++ b/tlsf.c
@@ -211,15 +211,15 @@ enum tlsf_public
        SL_INDEX_COUNT_LOG2 = 5,
 };

-/* Private constants: do not modify. */
+/* Private constants: do not modify. why ??? */
 enum tlsf_private
 {
 #if defined (TLSF_64BIT)

-       /* All allocation sizes and addresses are aligned to 8 bytes. */
-       ALIGN_SIZE_LOG2 = 3,

+       /* All allocation sizes and addresses are aligned to 8(->16) bytes. */
+       ALIGN_SIZE_LOG2 = 4,
         #else

-       /* All allocation sizes and addresses are aligned to 4 bytes. */
-       ALIGN_SIZE_LOG2 = 2,

+       /* All allocation sizes and addresses are aligned to 4(->8) bytes. */
+       ALIGN_SIZE_LOG2 = 3,
         #endif
        ALIGN_SIZE = (1 << ALIGN_SIZE_LOG2),
        

[pavel-kirienko]

Consider o1heap perhaps. It is also a constant-complexity, well-characterized allocator, but it doesn't make nontrivial assumptions about the target platform (such as limiting the memory alignment to the pointer size). I am obviously biased though because I am the author of that library, so beware.