- Merge struct procsig with struct sigacts.

- Move struct sigacts out of the u-area and malloc() it using the
  M_SUBPROC malloc bucket.
- Add a small sigacts_*() API for managing sigacts structures: sigacts_alloc(),
  sigacts_free(), sigacts_copy(), sigacts_share(), and sigacts_shared().
- Remove the p_sigignore, p_sigacts, and p_sigcatch macros.
- Add a mutex to struct sigacts that protects all the members of the struct.
- Add sigacts locking.
- Remove Giant from nosys(), kill(), killpg(), and kern_sigaction() now
  that sigacts is locked.
- Several in-kernel functions such as psignal(), tdsignal(), trapsignal(),
  and thread_stopped() are now MP safe.

Reviewed by:	arch@
Approved by:	re (rwatson)

1 files changed, 3 insertions, 1 deletions

diff --git a/sys/kern/kern_kthread.c b/sys/kern/kern_kthread.c
index d4846dd..7d38520 100644
--- a/sys/kern/kern_kthread.c
+++ b/sys/kern/kern_kthread.c
@@ -94,7 +94,9 @@ kthread_create(void (*func)(void *), void *arg,
 	/* this is a non-swapped system process */
 	PROC_LOCK(p2);
 	p2->p_flag |= P_SYSTEM | P_KTHREAD;
-	p2->p_procsig->ps_flag |= PS_NOCLDWAIT;
+	mtx_lock(&p2->p_sigacts->ps_mtx);
+	p2->p_sigacts->ps_flag |= PS_NOCLDWAIT;
+	mtx_unlock(&p2->p_sigacts->ps_mtx);
 	_PHOLD(p2);
 	PROC_UNLOCK(p2);