cvs commit: src/sys/sys systm.h src/sys/conf files src/sys/kern
phk at FreeBSD.org
Thu Sep 30 00:04:04 PDT 2004
phk 2004-09-30 07:04:03 UTC
FreeBSD src repository
Add a new API for allocating unit number (-like) resources.
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.
Revision Changes Path
1.955 +1 -0 src/sys/conf/files
1.1 +597 -0 src/sys/kern/subr_unit.c (new)
1.215 +8 -0 src/sys/sys/systm.h
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