- 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, 0 deletions

diff --git a/sys/i386/svr4/svr4_machdep.c b/sys/i386/svr4/svr4_machdep.c
index d29e37b..e477629 100644
--- a/sys/i386/svr4/svr4_machdep.c
+++ b/sys/i386/svr4/svr4_machdep.c
@@ -428,6 +428,7 @@ svr4_sendsig(catcher, sig, mask, code)
 #endif
 	PROC_LOCK_ASSERT(p, MA_OWNED);
 	psp = p->p_sigacts;
+	mtx_assert(&psp->ps_mtx, MA_OWNED);
 
 	tf = td->td_frame;
 	oonstack = sigonstack(tf->tf_esp);
@@ -443,6 +444,7 @@ svr4_sendsig(catcher, sig, mask, code)
 	} else {
 		fp = (struct svr4_sigframe *)tf->tf_esp - 1;
 	}
+	mtx_unlock(&psp->ps_mtx);
 	PROC_UNLOCK(p);
 
 	/* 
@@ -505,6 +507,7 @@ svr4_sendsig(catcher, sig, mask, code)
 	load_gs(_udatasel);
 	tf->tf_ss = _udatasel;
 	PROC_LOCK(p);
+	mtx_lock(&psp->ps_mtx);
 #endif
 }