[src/trunk]: src/lib/librumpuser Use __thread rather than pthread_getspecific...

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

details:   https://anonhg.NetBSD.org/src/rev/b46c1dfb47b8
branches:  trunk
changeset: 794260:b46c1dfb47b8
user:      justin <justin%NetBSD.org@localhost>
date:      Sun Mar 09 23:01:11 2014 +0000

description:
Use __thread rather than pthread_getspecific for rumpuser curlwp.
This has better performance and curlwp is a performance bottleneck
in rump kernel code.

diffstat:

 lib/librumpuser/rumpuser_pth.c |  20 +++++++++++---------
 1 files changed, 11 insertions(+), 9 deletions(-)

diffs (68 lines):

diff -r 6cb7e5a7adf4 -r b46c1dfb47b8 lib/librumpuser/rumpuser_pth.c
--- a/lib/librumpuser/rumpuser_pth.c    Sun Mar 09 22:31:25 2014 +0000
+++ b/lib/librumpuser/rumpuser_pth.c    Sun Mar 09 23:01:11 2014 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: rumpuser_pth.c,v 1.34 2013/10/27 16:39:46 rmind Exp $  */
+/*     $NetBSD: rumpuser_pth.c,v 1.35 2014/03/09 23:01:11 justin Exp $ */
 
 /*
  * Copyright (c) 2007-2010 Antti Kantee.  All Rights Reserved.
@@ -28,7 +28,7 @@
 #include "rumpuser_port.h"
 
 #if !defined(lint)
-__RCSID("$NetBSD: rumpuser_pth.c,v 1.34 2013/10/27 16:39:46 rmind Exp $");
+__RCSID("$NetBSD: rumpuser_pth.c,v 1.35 2014/03/09 23:01:11 justin Exp $");
 #endif /* !lint */
 
 #include <sys/queue.h>
@@ -622,13 +622,15 @@
  * curlwp
  */
 
-static pthread_key_t curlwpkey;
+static __thread struct lwp *curlwp;
 
 /*
  * the if0'd curlwp implementation is not used by this hypervisor,
  * but serves as test code to check that the intended usage works.
  */
 #if 0
+static pthread_key_t curlwpkey;
+
 struct rumpuser_lwp {
        struct lwp *l;
        LIST_ENTRY(rumpuser_lwp) l_entries;
@@ -716,12 +718,12 @@
        case RUMPUSER_LWP_DESTROY:
                break;
        case RUMPUSER_LWP_SET:
-               assert(pthread_getspecific(curlwpkey) == NULL);
-               pthread_setspecific(curlwpkey, l);
+               assert(curlwp == NULL);
+               curlwp = l;
                break;
        case RUMPUSER_LWP_CLEAR:
-               assert(pthread_getspecific(curlwpkey) == l);
-               pthread_setspecific(curlwpkey, NULL);
+               assert(curlwp == l);
+               curlwp = NULL;
                break;
        }
 }
@@ -730,7 +732,7 @@
 rumpuser_curlwp(void)
 {
 
-       return pthread_getspecific(curlwpkey);
+       return curlwp;
 }
 #endif
 
@@ -738,5 +740,5 @@
 void
 rumpuser__thrinit(void)
 {
-       pthread_key_create(&curlwpkey, NULL);
+
 }