[xml] to lock/unlock of xml file during a "job"

["Andreï V. FOMITCHEV" <afomitchev odixion com>]

Hello,
I wanted to know if it is possible to  explicitly (implicitly?) lock an 
xml file during a job (parsing, modifications, etc) as the function 
fcntl, then to unlock explicitly (implicitly?) the file. The goal is 
concurrencial access to the xml files.

Plateform: GNU/Linux
Version of libxml: 2.6.8 (compiled from CVS because of a memory leek of 
xmlMemMutex in xmlmemory.c)

--
Andreï V. FOMITCHEV             [Quand faut-il arrêter l'informatique]
Software R&D Engineer  [Lorsque, dans un kilo, on trouve 1024 grammes]
Odixion SAS, FRANCE