I apologize for my previous hasty conclusion. I have conducted further testing
on different platforms and would like to share my findings.
> FreeBSD
Based on my tests, it appears that FreeBSD follows the Itanium C++ ABI
specification. The previous test failed because the C++ compiler was not us
n, and once we encounter an exception that is not caught, we will
fix the code to catch the exception.
> doesn't this require us to move our minimum language requirement to
> C++-something?
No, all code has no dependency on C++.
regards, 盏一
> It seems extremely specific to one particular C++ implementation
To perform a force unwind during longjmp, the _Unwind_ForcedUnwind function is
used. This function is defined in the [Itanium C++ ABI
Standard](https://itanium-cxx-abi.github.io/cxx-abi/abi-eh.html#base-throw),
which is followe
-6b6034caa00ddf38f641cbd10d5a5d1bb7135f8b23c5a879e9703bd11bd8240f).
I would appreciate it if you could review the implementation and provide
feedback.
Thank you for your time and consideration.
Best regards,
盏一
--
Ok! Thanks
--
--原始邮件--
发件人："Andres Freund "
> Sounds like a plan! Do you want to write a patch?
Add the patch.
0001-use-pgxactoff-as-the-value-of-index-in-ProcArrayRemo.patch
Description: Binary data
Hi,
Since we have introduced `pgxactoff` in
[941697c3c1ae5d6ee153065adb96e1e63ee11224](https://github.com/postgres/postgres/commit/941697c3c1ae5d6ee153065adb96e1e63ee11224),
and `pgxactoff` is always the index of `proc->pgprocno` in
`procArray->pgprocnos`. So it seems that we could directly use
Sorry to bother you, now I know that there is no problem here.
The model for reading and writing of PGXACT::xid and
ShmemVariableCache->latestCompletedXid can be simplified as follows:
backend A backend B
backend C
wlock(XidGenLock);
The code in GetSnapshotData() that read the `xid` field of PGXACT struct
has a dependency on code in GetNewTransactionId() that write
`MyPgXact->xid`. It means that the store of xid should happen before the
load of it. In C11, we can use [Release-Acquire
ordering](https://en.cppreference.com/w
