Opportunistic Locking on Solaris. Does it exist?

Does anyone know if there are any programs similar to optlock (Opportunistic Locking on Windows NT)
for Solaris or (UNIX in general).

jonnyblazeAsked:
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WaltInBostonCommented:
Nope, there are none -

OpLocks under CIFS depend at least in part upon the "statefulness" of CIFS - i.e. there is a CIFS primitive to perform open and close operations.

NFS has neither open or close primitives, and so locking is all "advisory" rather than mandatory. The unix level flock() / lockf() calls all rely on network lock manager processes (running on client and server) to co-ordinate locking state, and since locking is advisory, there is nothing to prevent clientB from ignoring the lock held by clientA and writing to the object.

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tfewsterCommented:
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- Answered by WaltInBoston

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SpideyModCommented:
per recommendation

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