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re PR libgcj/49193 (__sync_xxxx builtins aren't used in sysdep/*/locks.h)

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PR libgcj/49193
	* sysdep/alpha/locks.h (compare_and_swap): Call
	__sync_bool_compare_and_swap.
	(release_set): Call __sync_synchronize.

From-SVN: r182692
This commit is contained in:
Uros Bizjak 2011-12-27 10:40:23 +01:00 committed by Uros Bizjak
parent 6231d28e0b
commit a055ca4382
2 changed files with 26 additions and 22 deletions
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7
libjava/ChangeLog
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@ -1,3 +1,10 @@
2011-12-27 Uros Bizjak <ubizjak@gmail.com>
PR libgcj/49193
* sysdep/alpha/locks.h (compare_and_swap): Call
__sync_bool_compare_and_swap.
(release_set): Call __sync_synchronize.
2011-12-20 Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE>
* configure.ac (i?86-*-linux*): Set SIGNAL_HANDLER_AUX.

41
libjava/sysdep/alpha/locks.h
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@ -1,6 +1,6 @@
// locks.h - Thread synchronization primitives. Alpha implementation.
/* Copyright (C) 2002 Free Software Foundation
/* Copyright (C) 2002, 2011 Free Software Foundation
This file is part of libgcj.
@ -11,41 +11,38 @@ details. */
#ifndef __SYSDEP_LOCKS_H__
#define __SYSDEP_LOCKS_H__
typedef size_t obj_addr_t; /* Integer type big enough for object */
/* address. */
/* Integer type big enough for object address. */
typedef size_t obj_addr_t;
// Atomically replace *addr by new_val if it was initially equal to old.
// Return true if the comparison succeeded.
// Assumed to have acquire semantics, i.e. later memory operations
// cannot execute before the compare_and_swap finishes.
inline static bool
compare_and_swap(volatile obj_addr_t *addr,
obj_addr_t old,
obj_addr_t new_val)
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;
return __sync_bool_compare_and_swap(addr, old, new_val);
}
// Set *addr to new_val with release semantics, i.e. making sure
// that prior loads and stores complete before this
// assignment.
inline static void
release_set(volatile obj_addr_t *addr, obj_addr_t new_val)
{
__asm__ __volatile__("mb" : : : "memory");
__sync_synchronize();
*(addr) = new_val;
}
// Compare_and_swap with release semantics instead of acquire semantics.
// On many architecture, the operation makes both guarantees, so the
// implementation can be the same.
inline static bool
compare_and_swap_release(volatile obj_addr_t *addr,
obj_addr_t old,
obj_addr_t new_val)
obj_addr_t old,
obj_addr_t new_val)
{
return compare_and_swap(addr, old, new_val);
}