diff options
author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
---|---|---|
committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/sysdep/alpha | |
download | cbb-gcc-4.6.4-554fd8c5195424bdbcabf5de30fdc183aba391bd.tar.bz2 cbb-gcc-4.6.4-554fd8c5195424bdbcabf5de30fdc183aba391bd.tar.xz |
obtained gcc-4.6.4.tar.bz2 from upstream website;upstream
verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.
downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
to the one extracted from the above tarball.
if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
directory might differ from line-endings of the respective
files in the upstream repository.
Diffstat (limited to 'libjava/sysdep/alpha')
-rw-r--r-- | libjava/sysdep/alpha/locks.h | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/libjava/sysdep/alpha/locks.h b/libjava/sysdep/alpha/locks.h new file mode 100644 index 000000000..a6b439408 --- /dev/null +++ b/libjava/sysdep/alpha/locks.h @@ -0,0 +1,69 @@ +// locks.h - Thread synchronization primitives. Alpha implementation. + +/* Copyright (C) 2002 Free Software Foundation + + This file is part of libgcj. + +This software is copyrighted work licensed under the terms of the +Libgcj License. Please consult the file "LIBGCJ_LICENSE" for +details. */ + +#ifndef __SYSDEP_LOCKS_H__ +#define __SYSDEP_LOCKS_H__ + +typedef size_t obj_addr_t; /* Integer type big enough for object */ + /* address. */ + +inline static bool +compare_and_swap(volatile obj_addr_t *addr, + obj_addr_t old, + obj_addr_t new_val) +{ + unsigned long oldval; + char result; + __asm__ __volatile__( + "1:ldq_l %0, %1\n\t" \ + "cmpeq %0, %5, %2\n\t" \ + "beq %2, 2f\n\t" \ + "mov %3, %0\n\t" \ + "stq_c %0, %1\n\t" \ + "bne %0, 2f\n\t" \ + "br 1b\n\t" \ + "2:mb" + : "=&r"(oldval), "=m"(*addr), "=&r"(result) + : "r" (new_val), "m"(*addr), "r"(old) : "memory"); + return (bool) result; +} + +inline static void +release_set(volatile obj_addr_t *addr, obj_addr_t new_val) +{ + __asm__ __volatile__("mb" : : : "memory"); + *(addr) = new_val; +} + +inline static bool +compare_and_swap_release(volatile obj_addr_t *addr, + obj_addr_t old, + obj_addr_t new_val) +{ + return compare_and_swap(addr, old, new_val); +} + +// Ensure that subsequent instructions do not execute on stale +// data that was loaded from memory before the barrier. +inline static void +read_barrier() +{ + __asm__ __volatile__("mb" : : : "memory"); +} + +// Ensure that prior stores to memory are completed with respect to other +// processors. +inline static void +write_barrier() +{ + __asm__ __volatile__("wmb" : : : "memory"); +} + +#endif |