diff options
Diffstat (limited to 'lib/libc_r/arch/alpha/_atomic_lock.S')
-rw-r--r-- | lib/libc_r/arch/alpha/_atomic_lock.S | 45 |
1 files changed, 0 insertions, 45 deletions
diff --git a/lib/libc_r/arch/alpha/_atomic_lock.S b/lib/libc_r/arch/alpha/_atomic_lock.S deleted file mode 100644 index 1ddceb0..0000000 --- a/lib/libc_r/arch/alpha/_atomic_lock.S +++ /dev/null @@ -1,45 +0,0 @@ -/* - * Copyright (c) 1998 John Birrell <jb@cimlogic.com.au>. - * All rights reserved. - * copyright Douglas Santry 1996 - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the above copyright is retained - * in the source form. - * - * THIS SOFTWARE IS PROVIDED BY Douglas Santry AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL Douglas Santry OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - * - * $FreeBSD$ - * - */ - -#include <machine/asm.h> - -/* - * Atomicly lock a location with an identifier provided the location - * is not currently locked. - * - * long _atomic_lock(long *); - * v0 will contain the return value (zero if lock obtained). - */ -LEAF(_atomic_lock,0) - LDGP(pv) - -0: ldq_l v0, 0(a0) /* read existing lock value */ - mov 1, t0 /* locked value to store */ - stq_c t0, 0(a0) /* attempt to store, status in t0 */ - beq t0, 1f /* branch foward to optimise prediction */ - mb /* sync with other processors */ - RET /* return with v0==0 if lock obtained */ -1: br 0b /* loop to try again */ -END(_atomic_lock) |