diff options
| author | matt <matt@NetBSD.org> | 2012-08-16 04:49:47 +0000 |
|---|---|---|
| committer | matt <matt@NetBSD.org> | 2012-08-16 04:49:47 +0000 |
| commit | 6a3069e1c50fa610f804db3be271aa4ae210b024 (patch) | |
| tree | 4fa288126e23a6b3717c3badfef8f9e5d11c61c4 /lib/libpthread/pthread_mutex.c | |
| parent | f54a3f5e69cc66993e101f08febc3fd40e22324d (diff) | |
Add a pthread__smt_wake and add support for it on arm along with
pthread__smt_pause. These are implemented using the ARM instructions
SEV (wake) and WFE (pause). These are treated as NOPs on ARM CPUs that
don't support them.
Diffstat (limited to 'lib/libpthread/pthread_mutex.c')
| -rw-r--r-- | lib/libpthread/pthread_mutex.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/lib/libpthread/pthread_mutex.c b/lib/libpthread/pthread_mutex.c index 110e98fa496..6b2c8d83873 100644 --- a/lib/libpthread/pthread_mutex.c +++ b/lib/libpthread/pthread_mutex.c @@ -1,4 +1,4 @@ -/* $NetBSD: pthread_mutex.c,v 1.53 2012/03/13 01:05:55 joerg Exp $ */ +/* $NetBSD: pthread_mutex.c,v 1.54 2012/08/16 04:49:47 matt Exp $ */ /*- * Copyright (c) 2001, 2003, 2006, 2007, 2008 The NetBSD Foundation, Inc. @@ -47,7 +47,7 @@ */ #include <sys/cdefs.h> -__RCSID("$NetBSD: pthread_mutex.c,v 1.53 2012/03/13 01:05:55 joerg Exp $"); +__RCSID("$NetBSD: pthread_mutex.c,v 1.54 2012/08/16 04:49:47 matt Exp $"); #include <sys/types.h> #include <sys/lwpctl.h> @@ -379,8 +379,10 @@ pthread_mutex_unlock(pthread_mutex_t *ptm) #endif self = pthread__self(); value = atomic_cas_ptr_ni(&ptm->ptm_owner, self, NULL); - if (__predict_true(value == self)) + if (__predict_true(value == self)) { + pthread__smt_wake(); return 0; + } return pthread__mutex_unlock_slow(ptm); } @@ -475,6 +477,7 @@ pthread__mutex_wakeup(pthread_t self, pthread_mutex_t *ptm) * are dependent upon 'thread'. */ thread = atomic_swap_ptr(&ptm->ptm_waiters, NULL); + pthread__smt_wake(); for (;;) { /* |
