I would like that BSD style flock is made clusterwide.
Many webapps in php is using flock.
Also, php itself is using flock for locking session
files. (although, you can use somthing else than files
for session data).
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OpenSSI-1.9 may already have this, not sure yet.
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Supported in SSI-1.9
Take that back flock is not clusterwide in SSI-1.9. flock needs to be converted to posix style lock to be clusterwide. For now use fcntl or another PHP session.save_handler.
Adding new CFS code to convert flock to POSIX style lock.
clusterwide flock() in CVS still needs a bit of work, but should be ready by 1.9.6 release.
Try attached patch. Apply against CVS.