/* Copyright (C) 2005 Free Software Foundation, Inc. Contributed by Richard Henderson <rth@redhat.com>. This file is part of the GNU OpenMP Library (libgomp). Libgomp 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. Libgomp 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 libgomp; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ /* As a special exception, if you link this library with other files, some of which are compiled with GCC, to produce an executable, this library does not by itself cause the resulting executable to be covered by the GNU General Public License. This exception does not however invalidate any other reasons why the executable file might be covered by the GNU General Public License. */ /* Provide target-specific access to the futex system call. */ #define FUTEX_WAIT 0 #define FUTEX_WAKE 1 #ifdef __LP64__ # ifndef SYS_futex # define SYS_futex 202 # endif static inline void futex_wait (int *addr, int val) { register long r10 __asm__("%r10") = 0; long res; __asm volatile ("syscall" : "=a" (res) : "0"(SYS_futex), "D" (addr), "S"(FUTEX_WAIT), "d"(val), "r"(r10) : "r11", "rcx", "memory"); } static inline void futex_wake (int *addr, int count) { long res; __asm volatile ("syscall" : "=a" (res) : "0"(SYS_futex), "D" (addr), "S"(FUTEX_WAKE), "d"(count) : "r11", "rcx", "memory"); } #else # ifndef SYS_futex # define SYS_futex 240 # endif # ifdef __PIC__ static inline void sys_futex0 (int *addr, int op, int val) { long res; __asm volatile ("xchgl\t%%ebx, %2\n\t" "int\t$0x80\n\t" "xchgl\t%%ebx, %2" : "=a" (res) : "0"(SYS_futex), "r" (addr), "c"(op), "d"(val), "S"(0) : "memory"); } # else static inline void sys_futex0 (int *addr, int op, int val) { long res; __asm volatile ("int $0x80" : "=a" (res) : "0"(SYS_futex), "b" (addr), "c"(op), "d"(val), "S"(0) : "memory"); } # endif /* __PIC__ */ static inline void futex_wait (int *addr, int val) { sys_futex0 (addr, FUTEX_WAIT, val); } static inline void futex_wake (int *addr, int count) { sys_futex0 (addr, FUTEX_WAKE, count); } #endif /* __LP64__ */