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[/] [openrisc/] [tags/] [gnu-src/] [gcc-4.5.1/] [gcc-4.5.1-or32-1.0rc3/] [libgomp/] [config/] [linux/] [powerpc/] [futex.h] - Rev 593
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/* Copyright (C) 2005, 2008, 2009 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 General Public License as published by the Free Software Foundation; either version 3, 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 General Public License for more details. Under Section 7 of GPL version 3, you are granted additional permissions described in the GCC Runtime Library Exception, version 3.1, as published by the Free Software Foundation. You should have received a copy of the GNU General Public License and a copy of the GCC Runtime Library Exception along with this program; see the files COPYING3 and COPYING.RUNTIME respectively. If not, see <http://www.gnu.org/licenses/>. */ /* Provide target-specific access to the futex system call. */ #include <sys/syscall.h> static inline long sys_futex0 (int *addr, int op, int val) { register long int r0 __asm__ ("r0"); register long int r3 __asm__ ("r3"); register long int r4 __asm__ ("r4"); register long int r5 __asm__ ("r5"); register long int r6 __asm__ ("r6"); r0 = SYS_futex; r3 = (long) addr; r4 = op; r5 = val; r6 = 0; /* ??? The powerpc64 sysdep.h file clobbers ctr; the powerpc32 sysdep.h doesn't. It doesn't much matter for us. In the interest of unity, go ahead and clobber it always. */ __asm volatile ("sc; mfcr %0" : "=r"(r0), "=r"(r3), "=r"(r4), "=r"(r5), "=r"(r6) : "r"(r0), "r"(r3), "r"(r4), "r"(r5), "r"(r6) : "r7", "r8", "r9", "r10", "r11", "r12", "cr0", "ctr", "memory"); if (__builtin_expect (r0 & (1 << 28), 0)) return r3; return 0; } static inline void futex_wait (int *addr, int val) { long err = sys_futex0 (addr, gomp_futex_wait, val); if (__builtin_expect (err == ENOSYS, 0)) { gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; sys_futex0 (addr, gomp_futex_wait, val); } } static inline void futex_wake (int *addr, int count) { long err = sys_futex0 (addr, gomp_futex_wake, count); if (__builtin_expect (err == ENOSYS, 0)) { gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; sys_futex0 (addr, gomp_futex_wake, count); } } static inline void cpu_relax (void) { __asm volatile ("" : : : "memory"); } static inline void atomic_write_barrier (void) { __asm volatile ("eieio" : : : "memory"); }
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