- 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, 4 insertions, 1 deletions

diff --git a/sys/ia64/ia64/machdep.c b/sys/ia64/ia64/machdep.c
index fafe287..dd3fc59 100644
--- a/sys/ia64/ia64/machdep.c
+++ b/sys/ia64/ia64/machdep.c
@@ -756,6 +756,7 @@ sendsig(sig_t catcher, int sig, sigset_t *mask, u_long code)
 	p = td->td_proc;
 	PROC_LOCK_ASSERT(p, MA_OWNED);
 	psp = p->p_sigacts;
+	mtx_assert(&psp->ps_mtx, MA_OWNED);
 	frame = td->td_frame;
 	oonstack = sigonstack(frame->tf_r[FRAME_SP]);
 	rndfsize = ((sizeof(sf) + 15) / 16) * 16;
@@ -822,6 +823,7 @@ sendsig(sig_t catcher, int sig, sigset_t *mask, u_long code)
 #endif
 	} else
 		sfp = (struct sigframe *)(frame->tf_r[FRAME_SP] - rndfsize);
+	mtx_unlock(&psp->ps_mtx);
 	PROC_UNLOCK(p);
 
 #ifdef DEBUG
@@ -870,7 +872,8 @@ sendsig(sig_t catcher, int sig, sigset_t *mask, u_long code)
 	frame->tf_cr_iip = PS_STRINGS - (esigcode - sigcode);
 	frame->tf_r[FRAME_R1] = sig;
 	PROC_LOCK(p);
-	if (SIGISMEMBER(p->p_sigacts->ps_siginfo, sig)) {
+	mtx_lock(&psp->ps_mtx);
+	if (SIGISMEMBER(psp->ps_siginfo, sig)) {
 		frame->tf_r[FRAME_R15] = (u_int64_t)&(sfp->sf_si);
 
 		/* Fill in POSIX parts */