/* * sysdeps/v850/pt-machine.h -- v850-specific pthread definitions * * Copyright (C) 2002 NEC Electronics Corporation * Copyright (C) 2002 Miles Bader <miles@gnu.org> * * This file is subject to the terms and conditions of the GNU Lesser * General Public License. See the file COPYING.LIB in the main * directory of this archive for more details. * * Written by Miles Bader <miles@gnu.org> */ #ifndef _PT_MACHINE_H #define _PT_MACHINE_H 1 #include <features.h> #ifndef PT_EI # define PT_EI __extern_always_inline #endif /* 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"); #define HAS_COMPARE_AND_SWAP /* Atomically: If *PTR == OLD, set *PTR to NEW and return true, otherwise do nothing and return false. */ PT_EI int __compare_and_swap (long *ptr, long old, long new) { unsigned long psw; /* disable interrupts */ __asm__ __volatile__ ("stsr psw, %0; di" : "=&r" (psw)); if (likely (*ptr == old)) { *ptr = new; __asm__ __volatile__ ("ldsr %0, psw" :: "r" (psw)); /* re-enable */ return 1; } else { __asm__ __volatile__ ("ldsr %0, psw" :: "r" (psw)); /* re-enable */ return 0; } } #endif /* pt-machine.h */