Clemens Anhuth wrote in a message to Erik Huelsmann:

EH> For example: I wanted to lock a file on multiple
EH> records, but they were not in one sequence; they were
EH> these numbers: 5 6 10 and 50

 CA> as far as os/2 is concerned and afaik you can only access
 CA> whole files. 

 CA> you can open a file read-only granting other programs the
 CA> same right or   you can open a file exclusively, locking it
 CA> completely against other   programs.

OS/2 provides the DosSetFileLocks() and DosProtectSetFileLocks() API calls.

 CA> there may be slight differences as far as os/2 and other
 CA> operating systems   are concerned, but this is the main idea
 CA> as i did understand it. 

Even DOS supports this with SHARE loaded, and OS/2 always emulates DOS as
if SHARE was loaded.
 
-- Mike


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