- 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, 2 insertions, 0 deletions

diff --git a/sys/kern/subr_trap.c b/sys/kern/subr_trap.c
index b2fc0fc..9eaa5b8 100644
--- a/sys/kern/subr_trap.c
+++ b/sys/kern/subr_trap.c
@@ -245,10 +245,12 @@ ast(struct trapframe *framep)
 
 		sigs = 0;
 		PROC_LOCK(p);
+		mtx_lock(&p->p_sigacts->ps_mtx);
 		while ((sig = cursig(td)) != 0) {
 			postsig(sig);
 			sigs++;
 		}
+		mtx_unlock(&p->p_sigacts->ps_mtx);
 		PROC_UNLOCK(p);
 		if (p->p_flag & P_THREADED && sigs) {
 			struct kse_upcall *ku = td->td_upcall;