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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/sysdep/sh/locks.h | |
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Diffstat (limited to 'libjava/sysdep/sh/locks.h')
-rw-r--r-- | libjava/sysdep/sh/locks.h | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/libjava/sysdep/sh/locks.h b/libjava/sysdep/sh/locks.h new file mode 100644 index 000000000..9a152fb30 --- /dev/null +++ b/libjava/sysdep/sh/locks.h @@ -0,0 +1,84 @@ +// locks.h - Thread synchronization primitives. SuperH implementation. + +/* Copyright (C) 2002, 2007 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. */ + +static unsigned char __cas_lock = 0; + +inline static void +__cas_start_atomic (void) +{ + unsigned int val; + + do + __asm__ __volatile__ ("tas.b @%1; movt %0" + : "=r" (val) + : "r" (&__cas_lock) + : "memory"); + while (val == 0); +} + +inline static void +__cas_end_atomic (void) +{ + __asm__ __volatile__ (" " : : : "memory"); + __cas_lock = 0; +} + +inline static bool +compare_and_swap (volatile obj_addr_t *addr, obj_addr_t old, + obj_addr_t new_val) +{ + bool ret; + + __cas_start_atomic (); + if (*addr != old) + ret = false; + else + { + *addr = new_val; + ret = true; + } + __cas_end_atomic (); + + return ret; +} + +inline static void +release_set (volatile obj_addr_t *addr, obj_addr_t new_val) +{ + __asm__ __volatile__ (" " : : : "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); +} + +inline static void +read_barrier() +{ + __asm__ __volatile__(" " : : : "memory"); +} + +inline static void +write_barrier() +{ + __asm__ __volatile__(" " : : : "memory"); +} + +#endif /* ! __SYSDEP_LOCKS_H__ */ |