Konstantin Belousov 84440afb54 In kern_sigsuspend(), better manipulate thread signal mask using
kern_sigprocmask() to properly notify other possible candidate threads
for signal delivery.

Since sigsuspend() shall only return to usermode after a signal was
delivered, do cursig/postsig loop immediately after waiting for
signal, repeating the wait if wakeup was spurious due to race with
other thread fetching signal from the process queue before us. Add
thread_suspend_check() call to allow the thread to be stopped or killed
while in loop.

Modify last argument of kern_sigprocmask() from boolean to flags,
allowing the function to be called with locked proc. Convertion of the
callers that supplied 1 to the old argument will be done in the next
commit, and due to SIGPROCMASK_OLD value equial to 1, code is formally
correct in between.

Reviewed by:	davidxu
Tested by:	pho
MFC after:	1 month
2009-10-27 10:42:24 +00:00
..
2009-05-18 12:03:43 +00:00
2009-05-27 16:36:54 +00:00
2009-05-29 14:25:51 +00:00
2009-08-23 09:55:06 +00:00
2009-05-26 09:19:21 +00:00