CVS commit: src/sys

["Jason R Thorpe" <thorpej%netbsd.org@localhost>]

Module Name:    src
Committed By:   thorpej
Date:           Fri Oct 23 00:25:45 UTC 2020

Modified Files:
        src/sys/kern: kern_sleepq.c
        src/sys/sys: lwp.h sleepq.h

Log Message:
- sleepq_block(): Add a new LWP flag, LW_CATCHINTR, that is used to track
  the intent to catch signals while sleeping.  Initialize this flag based
  on the catch_p argument to sleepq_block(), and rather than test catch_p
  when awakened, test LW_CATCHINTR.  This allows the intent to change
  (based on whatever criteria the owner of the sleepq wishes) while the
  LWP is asleep.  This is separate from LW_SINTR in order to leave all
  other logic around LW_SINTR unaffected.
- In sleepq_transfer(), adjust also LW_CATCHINTR based on the catch_p
  argument.  Also allow the new LWP lock argument to be NULL, which
  will cause the lwp_setlock() call to be skipped; this allows transfer
  to another sleepq that is known to be protected by the same lock.
- Add a new function, sleepq_uncatch(), that will transition an LWP
  from "interruptible sleep" to "uninterruptible sleep" on its current
  sleepq.


To generate a diff of this commit:
cvs rdiff -u -r1.68 -r1.69 src/sys/kern/kern_sleepq.c
cvs rdiff -u -r1.211 -r1.212 src/sys/sys/lwp.h
cvs rdiff -u -r1.31 -r1.32 src/sys/sys/sleepq.h

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.