diff options
Diffstat (limited to 'libgomp/config/linux/alpha/futex.h')
| -rw-r--r-- | libgomp/config/linux/alpha/futex.h | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/libgomp/config/linux/alpha/futex.h b/libgomp/config/linux/alpha/futex.h new file mode 100644 index 000000000..a594d1663 --- /dev/null +++ b/libgomp/config/linux/alpha/futex.h @@ -0,0 +1,109 @@ +/* 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. */ + +#ifndef SYS_futex +#define SYS_futex 394 +#endif + + +static inline void +futex_wait (int *addr, int val) +{ + register long sc_0 __asm__("$0"); + register long sc_16 __asm__("$16"); + register long sc_17 __asm__("$17"); + register long sc_18 __asm__("$18"); + register long sc_19 __asm__("$19"); + + sc_0 = SYS_futex; + sc_16 = (long) addr; + sc_17 = gomp_futex_wait; + sc_18 = val; + sc_19 = 0; + __asm volatile ("callsys" + : "=r" (sc_0), "=r"(sc_19) + : "0"(sc_0), "r" (sc_16), "r"(sc_17), "r"(sc_18), "1"(sc_19) + : "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8", + "$22", "$23", "$24", "$25", "$27", "$28", "memory"); + if (__builtin_expect (sc_19, 0) && sc_0 == ENOSYS) + { + gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; + gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; + sc_0 = SYS_futex; + sc_17 &= ~FUTEX_PRIVATE_FLAG; + sc_19 = 0; + __asm volatile ("callsys" + : "=r" (sc_0), "=r"(sc_19) + : "0"(sc_0), "r" (sc_16), "r"(sc_17), "r"(sc_18), + "1"(sc_19) + : "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8", + "$22", "$23", "$24", "$25", "$27", "$28", "memory"); + } +} + +static inline void +futex_wake (int *addr, int count) +{ + register long sc_0 __asm__("$0"); + register long sc_16 __asm__("$16"); + register long sc_17 __asm__("$17"); + register long sc_18 __asm__("$18"); + register long sc_19 __asm__("$19"); + + sc_0 = SYS_futex; + sc_16 = (long) addr; + sc_17 = gomp_futex_wake; + sc_18 = count; + __asm volatile ("callsys" + : "=r" (sc_0), "=r"(sc_19) + : "0"(sc_0), "r" (sc_16), "r"(sc_17), "r"(sc_18) + : "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8", + "$22", "$23", "$24", "$25", "$27", "$28", "memory"); + if (__builtin_expect (sc_19, 0) && sc_0 == ENOSYS) + { + gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; + gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; + sc_0 = SYS_futex; + sc_17 &= ~FUTEX_PRIVATE_FLAG; + __asm volatile ("callsys" + : "=r" (sc_0), "=r"(sc_19) + : "0"(sc_0), "r" (sc_16), "r"(sc_17), "r"(sc_18) + : "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8", + "$22", "$23", "$24", "$25", "$27", "$28", "memory"); + } +} + +static inline void +cpu_relax (void) +{ + __asm volatile ("" : : : "memory"); +} + +static inline void +atomic_write_barrier (void) +{ + __asm volatile ("wmb" : : : "memory"); +} |