SVNews r205237

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2010-03-17 03:02:48 - r205237 by lstewart (Lawrence Stewart)

Complete list of files affected by revision r205237:

(Note: At the moment, these links point to ViewVC on svn.freebsd.org. They are probably slow. Do not overuse.)

History	Contents	Diff	MODIFY	`/user/lstewart/alq_varlen_head/sys/kern/kern_alq.c`
History	Contents	Diff	MODIFY	`/user/lstewart/alq_varlen_head/sys/sys/alq.h`

Commit message:

- Rework the way thread ordering is enforced so that it actually behaves as

  expected (issue discovered during detailed testing). Ordering is now an

  off-by-default option that can be enabled at ALQ creation time using the

  ALQ_ORDERED flag.



- Add an alq_open_flags() KPI call to allow the new ALQ_ORDERED flag to be

  specified. alq_open() is now implemented as a wrapper around alq_open_flags.



- Rename alq_postn() to alq_post_flags() to keep the naming consistent.



- Keep a record of some useful debugging printf's (will be removed in a later

  diff).



- Remove some no longer relevant assertions.



- Introduce the AQ_VARLEN flag, used internally to indicate the ALQ is variable

  length message capable.



- Protect alq_getn/alq_post from 0 length writes so that the "use less than you

  asked for" feature works in contexts where no data may be generated.



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