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* sys/sys: further adoption of SPDX licensing ID tags.Pedro F. Giffuni2017-11-271-0/+2
| | | | | | | | | | | | | | | Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. Notes: svn path=/head/; revision=326256
* /* -> /*- for license, minor formatting changesWarner Losh2005-01-071-1/+1
| | | | Notes: svn path=/head/; revision=139825
* Added used includes. <sys/_lock.h> is a prerequisite for <sys/_mutex.h>,Bruce Evans2001-10-101-0/+2
| | | | | | | | and <sys/queue.h> is a prerequisite for both <sys/_lock.h> and <sys_mutex.h>. Notes: svn path=/head/; revision=84753
* Use NULL instead of __FILE__ in the !LOCK_DEBUG case in the locking codeJohn Baldwin2001-09-171-4/+4
| | | | | | | | since the filenames are only used in the LOCK_DEBUG case and are just bloat in the !LOCK_DEBUG case. Notes: svn path=/head/; revision=83593
* Implement kernel semaphores.Jason Evans2001-08-141-0/+60
Reviewed by: jhb Notes: svn path=/head/; revision=81645