futex.h revision 1.1.1.1
1/* Copyright (C) 2005 Free Software Foundation, Inc. 2 Contributed by Richard Henderson <rth@redhat.com>. 3 4 This file is part of the GNU OpenMP Library (libgomp). 5 6 Libgomp is free software; you can redistribute it and/or modify it 7 under the terms of the GNU Lesser General Public License as published by 8 the Free Software Foundation; either version 2.1 of the License, or 9 (at your option) any later version. 10 11 Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY 12 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 13 FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for 14 more details. 15 16 You should have received a copy of the GNU Lesser General Public License 17 along with libgomp; see the file COPYING.LIB. If not, write to the 18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, 19 MA 02110-1301, USA. */ 20 21/* As a special exception, if you link this library with other files, some 22 of which are compiled with GCC, to produce an executable, this library 23 does not by itself cause the resulting executable to be covered by the 24 GNU General Public License. This exception does not however invalidate 25 any other reasons why the executable file might be covered by the GNU 26 General Public License. */ 27 28/* Provide target-specific access to the futex system call. */ 29 30#include <sys/syscall.h> 31#define FUTEX_WAIT 0 32#define FUTEX_WAKE 1 33 34static inline void 35sys_futex0 (int *addr, int op, int val) 36{ 37 register long int r0 __asm__ ("r0"); 38 register long int r3 __asm__ ("r3"); 39 register long int r4 __asm__ ("r4"); 40 register long int r5 __asm__ ("r5"); 41 register long int r6 __asm__ ("r6"); 42 43 r0 = SYS_futex; 44 r3 = (long) addr; 45 r4 = op; 46 r5 = val; 47 r6 = 0; 48 49 /* ??? The powerpc64 sysdep.h file clobbers ctr; the powerpc32 sysdep.h 50 doesn't. It doesn't much matter for us. In the interest of unity, 51 go ahead and clobber it always. */ 52 53 __asm volatile ("sc" 54 : "=r"(r0), "=r"(r3), "=r"(r4), "=r"(r5), "=r"(r6) 55 : "r"(r0), "r"(r3), "r"(r4), "r"(r5), "r"(r6) 56 : "r7", "r8", "r9", "r10", "r11", "r12", 57 "cr0", "ctr", "memory"); 58} 59 60static inline void 61futex_wait (int *addr, int val) 62{ 63 sys_futex0 (addr, FUTEX_WAIT, val); 64} 65 66static inline void 67futex_wake (int *addr, int count) 68{ 69 sys_futex0 (addr, FUTEX_WAKE, count); 70} 71