[fpc-pascal] How to add new function related to MAC OS X

[Jonas Maebe]

On 22 May 2009, at 12:36, Roland Turcan wrote:

> I want to add new function for Mac OS X which calls FCNTL with
> F_FULLSYNC to the existing source tree, but I am really confused from
> the files to be changed/added.

Such a function will never be added to the rtl. The fcntl function is  
already there and you can use it. The only thing that can be added is  
the F_FULLSYNC constant to some Darwin-specific include file. Its  
value is 51, in case you want to add the constant declaration to one  
of your own units.


Jonas

PS: note that you don't have F_FULLSYNC-like functionality on many  
other OSes (there you always lose the data in case of a power failure  
before the data has been flushed from the drive's internal caches),  
and that it will significantly slow down your program if you don't  
watch out. There was a whole controversy a few years back about MySQL  
being dog slow on Mac OS X compared to on other OSes, and the reason  
turned out to be their use of fcntl(F_FULLSYNC) (although it's of  
course good practice from a data integrity point of view).