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* Remove debugging printfs.phk2005-03-141-8/+3
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* Reengineer subr_unitphk2005-03-081-287/+511
| | | | | | | | | | | | | | | Add support for passing in a mutex. If NULL is passed a global subr_unit mutex is used. Add alloc_unrl() which expects the mutex to be held. Allocating a unit will never sleep as it does not need to allocate memory. Cut possible range in half so we can use -1 to mean "out of number". Collapse first and last runs into the head by means of counters. This saves memory in the common case(s).
* Add placeholder mutex argument to new_unrhdr().phk2005-03-071-2/+2
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* /* -> /*- for copyright notices, minor format tweaks as necessaryimp2005-01-061-2/+3
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* Add delete_unrhdr() function.phk2004-10-251-2/+19
| | | | It will fail fatally if all allocated numbers have not been returned first.
* Fix a typo to fix the !DIAGNOSTIC build.jhb2004-09-301-1/+1
| | | | Submitted by: many
* Add a new API for allocating unit number (-like) resources.phk2004-09-301-0/+597
Allocation is always lowest free unit number. A mixed range/bitmap strategy for maximum memory efficiency. In the typical case where no unit numbers are freed total memory usage is 56 bytes on i386. malloc is called M_WAITOK but no locking is provided (yet). A bit of experience will be necessary to determine the best strategy. Hopefully a "caller provides locking" strategy can be maintained, but that may require use of M_NOWAIT allocation and failure handling. A userland test driver is included.
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