From 88e3fbcb5d6829f8980d6bb356b1c0cd7a38187b Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Sun, 3 Jul 2005 04:40:34 +0000 Subject: linuxthreads, linuxthreads_db: Directories removed (preserved in ports repository). --- linuxthreads/sysdeps/i386/pt-machine.h | 108 --------------------------------- 1 file changed, 108 deletions(-) delete mode 100644 linuxthreads/sysdeps/i386/pt-machine.h (limited to 'linuxthreads/sysdeps/i386/pt-machine.h') diff --git a/linuxthreads/sysdeps/i386/pt-machine.h b/linuxthreads/sysdeps/i386/pt-machine.h deleted file mode 100644 index 0df096d152..0000000000 --- a/linuxthreads/sysdeps/i386/pt-machine.h +++ /dev/null @@ -1,108 +0,0 @@ -/* Machine-dependent pthreads configuration and inline functions. - i386 version. - Copyright (C) 1996-2001, 2002, 2003 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Richard Henderson . - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public License as - published by the Free Software Foundation; either version 2.1 of the - License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; see the file COPYING.LIB. If not, - write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, - Boston, MA 02111-1307, USA. */ - -#ifndef _PT_MACHINE_H -#define _PT_MACHINE_H 1 - -#ifndef __ASSEMBLER__ -#ifndef PT_EI -# define PT_EI extern inline __attribute__ ((always_inline)) -#endif - -extern long int testandset (int *spinlock); -extern int __compare_and_swap (long int *p, long int oldval, long int newval); - -/* Get some notion of the current stack. Need not be exactly the top - of the stack, just something somewhere in the current frame. */ -#define CURRENT_STACK_FRAME __builtin_frame_address (0) - - -/* Spinlock implementation; required. */ -PT_EI long int -testandset (int *spinlock) -{ - long int ret; - - __asm__ __volatile__( - "xchgl %0, %1" - : "=r"(ret), "=m"(*spinlock) - : "0"(1), "m"(*spinlock) - : "memory"); - - return ret; -} - - -/* Compare-and-swap for semaphores. - Available on the 486 and above, but not on the 386. - We test dynamically whether it's available or not. */ - -#define HAS_COMPARE_AND_SWAP -#define TEST_FOR_COMPARE_AND_SWAP - -PT_EI int -__compare_and_swap (long int *p, long int oldval, long int newval) -{ - char ret; - long int readval; - - __asm__ __volatile__ ("lock; cmpxchgl %3, %1; sete %0" - : "=q" (ret), "=m" (*p), "=a" (readval) - : "r" (newval), "m" (*p), "a" (oldval) - : "memory"); - return ret; -} - - -PT_EI int -get_eflags (void) -{ - int res; - __asm__ __volatile__ ("pushfl; popl %0" : "=r" (res) : ); - return res; -} - - -PT_EI void -set_eflags (int newflags) -{ - __asm__ __volatile__ ("pushl %0; popfl" : : "r" (newflags) : "cc"); -} - - -PT_EI int -compare_and_swap_is_available (void) -{ - int oldflags = get_eflags (); - int changed; - /* Flip AC bit in EFLAGS. */ - set_eflags (oldflags ^ 0x40000); - /* See if bit changed. */ - changed = (get_eflags () ^ oldflags) & 0x40000; - /* Restore EFLAGS. */ - set_eflags (oldflags); - /* If the AC flag did not change, it's a 386 and it lacks cmpxchg. - Otherwise, it's a 486 or above and it has cmpxchg. */ - return changed != 0; -} -#endif /* __ASSEMBLER__ */ - -#endif /* pt-machine.h */ -- cgit 1.4.1