Hi all I am experimenting with file locking on Linux/HPUX/SunOS. It works OK on Linux, but HPUX and SunOS seem to be rather ignorant of shared locks (LOCK_SH), while exclusive locks work fine. For instance:

Process 1: open FH, ">lock" or die "Cannot >lock";
           flock( FH, LOCK_SH );
[download]

A while after...

Process 2: open FH, ">lock" or die "Cannot >lock";
           flock( FH, LOCK_EX );
[download]

This while cause Process 2 to wait for Process 1 to unlock FH on Linux, but not on HPUX and SunOS. Using a LOCK_EX instead of LOCK_SH cause Process 2 to wait on HPUX and SunOS which is the expected result.

Now my questions are:
- is that feature something know ? ( I have not found any clue about that in perlport).
- is there a way to emulate properly flock on HPUX and SunOS.

Thanks

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