[fpc-devel] Re: systemh.inc InterLockedIncrement64 (var Target: int64)

[Jeppe Johansen]

Den 27-10-2010 23:14, Florian Klämpfl skrev:
> Am 27.10.2010 22:52, schrieb Andrew Brunner:
>> My SCS project which is a scalable unified collaboration and
>> communication server that uses counting for transactions and network
>> consumption across all implemented protocols.  Bytes, when aggregated
>> can clearly exceed the 2GB limitation within seconds.  Partial
>> transactions (PTX) can exceed over 30,000 per second and full
>> transactions (TX) are typically 50% of that... But these numbers need
>> to add up.  Meaning the aggregate TX count must be of some proportion
>> of the PTX otherwise they are bogus.
>>
>> Int64 or QWord w/o locking or CAS is a serious issue for me.  I
>> absolutely need this feature or my transaction/byte counts will be off
>> per node per cluster and can lead to misinformation in the consumption
>> reports.
>>
>> For the time being though I can restrict the scale on i386
>> architecture since I tried to re-map the methods in the system.inc
>> file to no avail.  It appears that FPC does not include the
>> Interlocked*64 methods inside the RTL.
> I propose to add the 64 bit CAS for all 32 bit archs (if available): the
> 64 bit CAS instruction on a 32 bit target makes makes a lot "lock-free"
> algorithms simpler.
>
> So you can build your 64 bit interlockedincrement yourself (there is no
> native on any 32 bit target I'am aware of).
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CMPXCHG8B works on probably most x86 architectures