| /* |
| * 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 */ |