diff options
Diffstat (limited to 'erts/include/internal/i386/spinlock.h')
| -rw-r--r-- | erts/include/internal/i386/spinlock.h | 27 |
1 files changed, 17 insertions, 10 deletions
diff --git a/erts/include/internal/i386/spinlock.h b/erts/include/internal/i386/spinlock.h index 0325324895..a84fba91b1 100644 --- a/erts/include/internal/i386/spinlock.h +++ b/erts/include/internal/i386/spinlock.h @@ -1,7 +1,7 @@ /* * %CopyrightBegin% * - * Copyright Ericsson AB 2005-2010. All Rights Reserved. + * Copyright Ericsson AB 2005-2011. All Rights Reserved. * * The contents of this file are subject to the Erlang Public License, * Version 1.1, (the "License"); you may not use this file except in @@ -24,6 +24,9 @@ #ifndef ETHREAD_I386_SPINLOCK_H #define ETHREAD_I386_SPINLOCK_H +#define ETHR_HAVE_NATIVE_SPINLOCKS 1 +#define ETHR_NATIVE_SPINLOCK_IMPL "ethread" + /* A spinlock is the low byte of an aligned 32-bit integer. * A non-zero value means that the lock is locked. */ @@ -46,16 +49,20 @@ ethr_native_spin_unlock(ethr_native_spinlock_t *lock) * On i386 this needs to be a locked operation * to avoid Pentium Pro errata 66 and 92. */ -#if defined(__x86_64__) || !defined(ETHR_PRE_PENTIUM4_COMPAT) - __asm__ __volatile__("" : : : "memory"); - *(unsigned char*)&lock->lock = 0; -#else - char tmp = 0; - __asm__ __volatile__( - "xchgb %b0, %1" - : "=q"(tmp), "=m"(lock->lock) - : "0"(tmp) : "memory"); +#if !defined(__x86_64__) + if (ETHR_X86_RUNTIME_CONF_HAVE_NO_SSE2__) { + char tmp = 0; + __asm__ __volatile__( + "xchgb %b0, %1" + : "=q"(tmp), "=m"(lock->lock) + : "0"(tmp) : "memory"); + } + else #endif + { + ETHR_MEMBAR(ETHR_LoadStore|ETHR_StoreStore); + *(unsigned char*)&lock->lock = 0; + } } static ETHR_INLINE int |