About Meta Memory and Synchronisation

[Sath Prakash Chimmani]

From reading through the source code of TSAN V3, I understand tsan maps App Addresses to Heap blocks(MBlock) and SyncVar(SyncVar) to monitor them (tsan_sync.h & tsan_sync.cpp).

My question is, 

1) What is MBlock?

2) Is Meta Memory an additional memory on top of Application Memory (like Shadow Memory)? 

I was wondering if anyone group can help me out. Thanks in advance!

[Dmitry Vyukov]

On Fri, 22 Mar 2024 at 03:22, Sath Prakash Chimmani
<spchi...@gmail.com> wrote:
>
> From reading through the source code of TSAN V3, I understand tsan maps App Addresses to Heap blocks(MBlock) and SyncVar(SyncVar) to monitor them (tsan_sync.h & tsan_sync.cpp).
>
> My question is,
> 1) What is MBlock?

Hi Sath,

MBlock is a descriptor of a heap memory block.

> 2) Is Meta Memory an additional memory on top of Application Memory (like Shadow Memory)?

Yes, meta memory is a shadow memory.
Tsan has 2 shadow memory ranges: one that stores info about memory
access, and the meta shadow that stores info about heap blocks and
synchronization objects.

> I was wondering if anyone group can help me out. Thanks in advance!
>

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