- 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, 7 deletions

diff --git a/sys/kern/init_main.c b/sys/kern/init_main.c
index 83fca78..6caec77 100644
--- a/sys/kern/init_main.c
+++ b/sys/kern/init_main.c
@@ -90,7 +90,6 @@ struct	proc proc0;
 struct	thread thread0;
 struct	kse kse0;
 struct	ksegrp ksegrp0;
-static struct procsig procsig0;
 static struct filedesc0 filedesc0;
 static struct plimit limit0;
 struct	vmspace vmspace0;
@@ -399,9 +398,8 @@ proc0_init(void *dummy __unused)
 #endif
 	td->td_ucred = crhold(p->p_ucred);
 
-	/* Create procsig. */
-	p->p_procsig = &procsig0;
-	p->p_procsig->ps_refcnt = 1;
+	/* Create sigacts. */
+	p->p_sigacts = sigacts_alloc();
 
 	/* Initialize signal state for process 0. */
 	siginit(&proc0);
@@ -441,11 +439,10 @@ proc0_init(void *dummy __unused)
 	vmspace0.vm_map.pmap = vmspace_pmap(&vmspace0);
 
 	/*
-	 * We continue to place resource usage info and signal
-	 * actions in the user struct so they're pageable.
+	 * We continue to place resource usage info
+	 * in the user struct so that it's pageable.
 	 */
 	p->p_stats = &p->p_uarea->u_stats;
-	p->p_sigacts = &p->p_uarea->u_sigacts;
 
 	/*
 	 * Charge root for one process.