From owner-cvs-all  Sat Dec  4 14:56: 9 1999
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From: Daniel Eischen <deischen@FreeBSD.org>
Date: Sat, 4 Dec 1999 14:55:59 -0800 (PST)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/lib/libc_r/uthread pthread_private.h uthread_fork.c
         uthread_sig.c uthread_sigwait.c
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deischen    1999/12/04 14:55:59 PST

  Modified files:
    lib/libc_r/uthread   pthread_private.h uthread_fork.c 
                         uthread_sig.c uthread_sigwait.c 
  Log:
  Change signal handling to conform to POSIX specified semantics.
  Before this change, a signal was delivered to each thread that
  didn't have the signal masked.  Signals also improperly woke up
  threads waiting on I/O.  With this change, signals are now
  handled in the following way:
  
    o If a thread is waiting in a sigwait for the signal,
      then the thread is woken up.
  
    o If no threads are sigwait'ing on the signal and a
      thread is in a sigsuspend waiting for the signal,
      then the thread is woken up.
  
    o In the case that no threads are waiting or suspended
      on the signal, then the signal is delivered to the
      first thread we find that has the signal unmasked.
  
    o If no threads are waiting or suspended on the signal,
      and no threads have the signal unmasked, then the signal
      is added to the process wide pending signal set.  The
      signal will be delivered to the first thread that unmasks
      the signal.
  
  If there is an installed signal handler, it is only invoked
  if the chosen thread was not in a sigwait.
  
  In the case that multiple threads are waiting or suspended
  on a signal, or multiple threads have the signal unmasked,
  we wake up/deliver the signal to the first thread we find.
  The above rules still apply.
  
  Reported by:	Scott Hess <scott@avantgo.com>
  Reviewed by:	jb, jasone
  
  Revision  Changes    Path
  1.30      +7 -3      src/lib/libc_r/uthread/pthread_private.h
  1.15      +4 -1      src/lib/libc_r/uthread/uthread_fork.c
  1.21      +66 -24    src/lib/libc_r/uthread/uthread_sig.c
  1.12      +6 -3      src/lib/libc_r/uthread/uthread_sigwait.c



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