[src/trunk]: src/sys/rump/librump/rumpkern Add lwp_find() - verbatim copy fro...

[martin <martin%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/9dcea2a70ea7
branches:  trunk
changeset: 344849:9dcea2a70ea7
user:      martin <martin%NetBSD.org@localhost>
date:      Sun Apr 24 07:45:10 2016 +0000

description:
Add lwp_find() - verbatim copy from the hard kernel.

diffstat:

 sys/rump/librump/rumpkern/lwproc.c |  31 +++++++++++++++++++++++++++++--
 1 files changed, 29 insertions(+), 2 deletions(-)

diffs (52 lines):

diff -r 98b6cd614ea5 -r 9dcea2a70ea7 sys/rump/librump/rumpkern/lwproc.c
--- a/sys/rump/librump/rumpkern/lwproc.c        Sun Apr 24 04:26:12 2016 +0000
+++ b/sys/rump/librump/rumpkern/lwproc.c        Sun Apr 24 07:45:10 2016 +0000
@@ -1,4 +1,4 @@
-/*      $NetBSD: lwproc.c,v 1.39 2016/04/04 20:47:57 christos Exp $    */
+/*      $NetBSD: lwproc.c,v 1.40 2016/04/24 07:45:10 martin Exp $      */
 
 /*
  * Copyright (c) 2010, 2011 Antti Kantee.  All Rights Reserved.
@@ -28,7 +28,7 @@
 #define RUMP__CURLWP_PRIVATE
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: lwproc.c,v 1.39 2016/04/04 20:47:57 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD: lwproc.c,v 1.40 2016/04/24 07:45:10 martin Exp $");
 
 #include <sys/param.h>
 #include <sys/atomic.h>
@@ -69,6 +69,33 @@
        (*l->l_syncobj->sobj_unsleep)(l, cleanup);
 }
 
+/*
+ * Look up a live LWP within the specified process.
+ * 
+ * Must be called with p->p_lock held.
+ */
+struct lwp *
+lwp_find(struct proc *p, lwpid_t id)
+{
+       struct lwp *l;
+
+       KASSERT(mutex_owned(p->p_lock));
+
+       LIST_FOREACH(l, &p->p_lwps, l_sibling) {
+               if (l->l_lid == id)
+                       break;
+       }
+
+       /*
+        * No need to lock - all of these conditions will
+        * be visible with the process level mutex held.
+        */
+       if (l != NULL && (l->l_stat == LSIDL || l->l_stat == LSZOMB))
+               l = NULL;
+
+       return l;
+}
+
 void
 lwp_update_creds(struct lwp *l)
 {