1 /* Machine-dependent pthreads configuration and inline functions.
3 Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
5 Contributed by Richard Henderson <rth@tamu.edu>.
7 The GNU C Library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Library General Public License as
9 published by the Free Software Foundation; either version 2 of the
10 License, or (at your option) any later version.
12 The GNU C Library is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Library General Public License for more details.
17 You should have received a copy of the GNU Library General Public
18 License along with the GNU C Library; see the file COPYING.LIB. If not,
19 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
23 # define PT_EI extern inline
27 /* Get some notion of the current stack. Need not be exactly the top
28 of the stack, just something somewhere in the current frame. */
29 #define CURRENT_STACK_FRAME stack_pointer
30 register char * stack_pointer __asm__ ("%esp");
33 /* Spinlock implementation; required. */
35 testandset (int *spinlock)
39 __asm__ __volatile__ (
41 : "=r"(ret), "=m"(*spinlock)
42 : "0"(1), "m"(*spinlock)
49 /* Compare-and-swap for semaphores. It's always available on i686. */
50 #define HAS_COMPARE_AND_SWAP
53 __compare_and_swap (long int *p, long int oldval, long int newval)
58 __asm__ __volatile__ ("lock; cmpxchgl %3, %1; sete %0"
59 : "=q" (ret), "=m" (*p), "=a" (readval)
60 : "r" (newval), "m" (*p), "a" (oldval)
66 /* Use the LDT implementation only if the kernel is fixed. */
67 //#include "../useldt.h"