mirror of
https://gcc.gnu.org/git/gcc.git
synced 2024-12-15 06:54:05 +08:00
4d8f018e30
2007-01-22 Andrew Haley <aph@redhat.com>
* sysdep/alpha/locks.h (write_barrier): New.
From-SVN: r121053
62 lines
1.4 KiB
C
62 lines
1.4 KiB
C
// 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 prior stores to memory are completed with respect to other
|
|
// processors.
|
|
inline static void
|
|
write_barrier()
|
|
{
|
|
__asm__ __volatile__("wmb" : : : "memory");
|
|
}
|
|
|
|
#endif
|