cvs commit: src/sys/kern subr_sleepqueue.c

[Jeff Roberson]

jeff        2008-03-19 07:35:14 UTC

  FreeBSD src repository

  Modified files:
    sys/kern             subr_sleepqueue.c 
  Log:
   - At the top of sleepq_catch_signals() lock the thread and check TDF_NEEDSIGCHK
     before doing the very expensive cursig() and related locking.  NEEDSIGCHK
     is updated whenever our signal mask change or when a signal is delivered and
     should be sufficient to avoid the more expensive tests.  This eliminates
     another source of PROC_LOCK contention in multithreaded programs.
  
  Revision  Changes    Path
  1.50      +12 -4     src/sys/kern/subr_sleepqueue.c