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Add a pthread__smt_wake and add support for it on arm along with

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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.
This commit is contained in:
matt 2012-08-16 04:49:47 +00:00
parent d4798304b1
commit 2f1e74f8c5
4 changed files with 17 additions and 7 deletions
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5
lib/libpthread/arch/arm/pthread_md.h
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@ -1,4 +1,4 @@
/* $NetBSD: pthread_md.h,v 1.6 2011/01/25 19:12:04 christos Exp $ */
/* $NetBSD: pthread_md.h,v 1.7 2012/08/16 04:49:48 matt Exp $ */
/*
* Copyright (c) 2001 Wasabi Systems, Inc.
@ -49,6 +49,9 @@ pthread__sp(void)
return (ret);
}
#define pthread__smt_pause() __asm __volatile("wfe")
#define pthread__smt_wake() __asm __volatile("sev")
#define pthread__uc_sp(ucp) ((ucp)->uc_mcontext.__gregs[_REG_SP])
/*

5
lib/libpthread/pthread_int.h
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@ -1,4 +1,4 @@
/* $NetBSD: pthread_int.h,v 1.85 2012/05/04 12:26:33 joerg Exp $ */
/* $NetBSD: pthread_int.h,v 1.86 2012/08/16 04:49:47 matt Exp $ */
/*-
* Copyright (c) 2001, 2002, 2003, 2006, 2007, 2008 The NetBSD Foundation, Inc.
@ -299,6 +299,9 @@ int pthread__checkpri(int) PTHREAD_HIDE;
#ifndef pthread__smt_pause
#define pthread__smt_pause() /* nothing */
#endif
#ifndef pthread__smt_wake
#define pthread__smt_wake() /* nothing */
#endif
/*
* Bits in the owner field of the lock that indicate lock state. If the

9
lib/libpthread/pthread_mutex.c
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@ -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 (;;) {
/*

5
lib/libpthread/pthread_spin.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: pthread_spin.c,v 1.5 2008/04/28 20:23:01 martin Exp $ */
/* $NetBSD: pthread_spin.c,v 1.6 2012/08/16 04:49:47 matt Exp $ */
/*-
* Copyright (c) 2001, 2006, 2007 The NetBSD Foundation, Inc.
@ -34,7 +34,7 @@
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: pthread_spin.c,v 1.5 2008/04/28 20:23:01 martin Exp $");
__RCSID("$NetBSD: pthread_spin.c,v 1.6 2012/08/16 04:49:47 matt Exp $");
#include <sys/types.h>
#include <sys/ras.h>
@ -133,6 +133,7 @@ pthread_spin_unlock(pthread_spinlock_t *lock)
self = pthread__self();
pthread__spinunlock(self, &lock->pts_spin);
pthread__smt_wake();
return 0;
}