/* Machine-dependent pthreads configuration and inline functions. m68k version. Copyright (C) 1996, 1998, 2000, 2002 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Richard Henderson <rth@tamu.edu>. 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 PT_EI # define PT_EI extern inline #endif extern long int testandset (int *spinlock); extern int __compare_and_swap (long int *p, long int oldval, long int newval); /* Spinlock implementation; required. */ PT_EI long int testandset (int *spinlock) { char ret; __asm__ __volatile__( #if !defined(__mcoldfire__) && !defined(__mcf5200__) && !defined(__m68000) "tas %1; sne %0" #else "bset #7,%1; sne %0" #endif : "=dm"(ret), "=m"(*spinlock) : "m"(*spinlock) : "cc"); return ret; } /* 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 stack_pointer register char * stack_pointer __asm__ ("%sp"); /* Compare-and-swap for semaphores. */ #if !defined(__mcoldfire__) && !defined(__mcf5200__) && !defined(__mc68000) #define HAS_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__ ("casl %2, %3, %1; seq %0" : "=dm" (ret), "=m" (*p), "=d" (readval) : "d" (newval), "m" (*p), "2" (oldval)); return ret; } #endif #endif /* pt-machine.h */