Safely writing to the same file in parallel foreach loop

[Joseph Rushton Wakeling]

On 11/14/2012 05:16 PM, H. S. Teoh wrote:
> If you're on Posix, you can use file locks to ensure atomic writes to
> the file (all threads have to use it though: it's only an advisory lock,
> not a mandatory lock): see the manpage for fcntl, look for F_GETLK.

I take it there's no more "native-to-D" way of implementing a file lock? :-(

I was browsing through the library descriptions of Mutex and ReadWriteMutex, but 
it's not clear how they'd apply to this case (parallelism is really something I 
have very limited experience of).  I'm actually inclining towards an alternate 
solution, where the different threads send back results to the master thread 
which integrates them and writes out everything itself.