diff options
Diffstat (limited to 'libpthread/linuxthreads/sysdeps/v850/pt-machine.h')
-rw-r--r-- | libpthread/linuxthreads/sysdeps/v850/pt-machine.h | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/libpthread/linuxthreads/sysdeps/v850/pt-machine.h b/libpthread/linuxthreads/sysdeps/v850/pt-machine.h new file mode 100644 index 000000000..34de63b9f --- /dev/null +++ b/libpthread/linuxthreads/sysdeps/v850/pt-machine.h @@ -0,0 +1,52 @@ +/* + * 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 */ |