| new_unrhdr low high mutex |
| | Initialize a new unit number allocator entity. The low and high arguments specify minimum and maximum number of unit numbers. There is no cost associated with the range of unit numbers, so unless the resource really is finite, INT_MAX can be used. If mutex is not NULL, it is used for locking when allocating and freeing units. Otherwise, internal mutex is used. |
| delete_unrhdr uh |
| | Destroy specified unit number allocator entity. |
| alloc_unr uh |
| | Return a new unit number. The lowest free number is always allocated. This function does not allocate memory and never sleeps, however it may block on a mutex. If no free unit numbers are left, -1 is returned. |
| alloc_unrl uh |
| | Same as alloc_unr except that mutex is assumed to be already locked and thus is not used. |
| free_unr uh |
| | Free a previously allocated unit number. This function may require allocating memory, and thus it can sleep. There is no pre-locked variant. |
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